F AONBI JBYUNMT ED119BIZ UNCLASSIFIED - 199 731 r U ...7 ame Same Jan 67 Jul 72 Sune Same S ae 163...

- 199 731 r F AONBI JBYUNMT ED119BIZ U I7 U UIM o '

UNCLASSIFIED U 'A 7S-U ~ L'A 4/2 P

w_ .2

flllt

11125 -

MI1CROCOPY RESOL~UTIN 'TF5 C""ART

4r alozwI

-91IC fiLE ((2F)

4wA a3si?,a7 3 aS~r/s -12/ 71

OPERATING LOCATION - A' qlECTE

iO'D Air USAFETAC SM 2 4 88

Air Weather Service (MAC)I REVISED UNIFORM SUMMARY OF

tj~AFT~e'SURFACE WEATHER OBSERVATIONS

RAF ALCONBURY UK MSC* 035623N 52 22 W 000 13 ELEV 160 FT EGWZ

PARTS A - F HOURS SUMMARIZED 0000 - 2300 [ST

PERIOD OF RECORD:HOURLY OBSERVATIONS: OCT 77 - SEP 87

SUMMARY OF DAY DATA: SEP 55 - JAN 56,FEB 57 - SEP 87

MAR 0 1 1988

"Approved for public release; FEDERAL BUILDINGDistribution Unlimited"

ASHEVILLE, N.C. 28801- 2723

88 8 22 08!

RIPORT DOCUMOTATIO PAGE

la. Report Security Classification: UNCLASSIFIED

3. Distribution/Awallabillty of Report: Approved for public release; Distributionunlimited.

4. Performing Orgnization Report Number: USAFETAC/DS-88/013.

5. Monitoring Organization Report Number: USAFETAC/DS-88/013.

6a. kom of Performing Organization: USAFETAC/OL-A6b. Office Symbol:6c. Adress: Federal Building, Asheville, NC 28801-2723.

11 Title: (RUSSWO) RAP Alconbury UK.

12 Personal Author(s):

13a Type of Report: Data Summary13b Timi Covered: Sep 55-Jan 56, Feb 57-Sep 57.

14 Date of Report: Mar 1988

15 Page Count: 312

17 COSATI Codes: Field--04, Group--02

18 Subject Terms: *climatology; *weather; meteorological conditions; winds;precipitation; temperature; visibility; barometric pressure; relative humidity; sky cover;psychrometric data; ceiling; Revised Uniform Summary of Surface Weather Observations(RUSSWO); RAF Alconbury United Kingdom; United Kingdom; UK035623.

19 Abstract: 'A six-part statistical data summary of surface weather observationsfor: RAF Alconbury UK. Summary consists of: PART A, Weather Conditions and AtmosphericPhenomena; PART B, Precipitation; PART C, Surface Winds; PART D, Ceiling and Visibility;PART E, Psychrometric Summaries; PART F, Pressure Summaries. See USAFETAC/TN-83/OO1(ADA132186),'An Aid for Using the Revised Uniform Summary of Surface Weather Observations(RUSSWO)fortcomplete description of contents and instructions for use.

20 Distributioa/Awallability of Abstract: Same as report.

21 Abstract Security Classification: UNCLASSIFIED.

22a am of Responsible lidviumal: Marianne L. Cavanaugh22b Telepbone: (618)256-262522c Office Symbol: USAFETAC/LDD

DD FM 1473UNCLASSIFIED

VEU SSS SSs W WwRERPUE til SS SS SS S 11 M M 00 00

A:R UNR Uti UU I SS ISS WI M 000 00

all PR til il SS SIS S MU MU 0 00

RU U UU til IS SI S S MM . MV, 00 00

a'Un OR Uti til III III III III MMMM 00 0

RI E tl IIIIISSIs 11111111 WM M MM M 0000010000

In U UUVUUU M111 IS SIs MUM MNM 0000

STATION NME:I RAF ALCONSURV UNITED MIN6000

oSTATION NLRBEI 035623 CALL IDt EGM?

PERIOD Of RECOMO, "OURS SUINPARIZE09 0010-2300 LII

gOlRLV OBSERVAT IONSI OCT 7? SEP 97

C)SUNNARV OF DST DATA% SLP SS JA 56# F111 S? SE 87S

TIME CONVERSION LIT TO GMT& *0

DATE PAODSICEOI 11 Fle I964

L-AIUSAFETACINA/Ai REVISED UNIFORM SUMM9ARV OF SURFACE WEATH4ER OBSERVATIONSO ASHEVILLE NC 2u01

o HOURLY OBSERVATIONS: ALL RECORD OR RECORD SPECIAL OBSERVATIONS RECORDED ON THE AWS FORPS 10110A AT SCHEDULED hW.JRLYINTERVALS.

o SUMMARY OF DAY CATA 10AILY OBSERVATIONS#: DATA COMPILED FROM ALL AVAILABLE OBSERVATIONS WHICH INCLUDES HOURLYOBSERVATIONS AND DAILY DATA RECORDED IN COLUMNS 66!:?3* AWS FORMS 10110A.

o DESCRIPTION OF SUMMARIES: PRECECOINI EACH PART OF THE RUSSNO IS A BRIEF DISCUSSION OF THE SUMMARY INCLUDING THEHMNER OF PRESENTATION.

O STANDARD 3-HOUIR TIME GROUPSx IN ALL SUMMARIES SHOWING DIURNAL VARIATIONS, WE SUMMARIZE DATA USING THEFOLLOWING EIGHT 3-HOUR TINE PERIODS IN LOCAL STANDARD TIME: W000-0200, 0300-0500. 0600-DAD0. 09OLII1'.,

1200-14O0, 1SGO-i.70 o 1000:2000, 2100-2300 LST.

FOR A DETAILED CESCRIPT ION Of EACH SUMMARY WITH EXAMPLES AND EXERCISES ON ITS USAGE, SEE USAFETAC/T-B03-DI, *ANAID FOR USING THE REVISED UNIFORM SUMMARY OF SURFACE WEATHER OBSERVATIONS" IRVSSWO1.

TAKLE Of CONTENTS

STATION HISTORY

oPART A: WEATHER CONDITIONS AND ATMOSP14ERIC PHENOMENA SUMMARIES

PART B: PRECIPITATION, SNOWFALL. AND SNOW DEPTH SUMMARIES

PART C: SURFACE WIND SLMMARIES

oPART 0: CEILING VERSUS VISIBILITY AND SKY COVER SUMMARIES

PART E: TEMPERATURE AMA RELATIVE HUMIDITY SUMMARIES

PART Fs PRESSURE SUMMARIES

o -

AWSSC NUMBERSA THIS NUMBER IS THE AIR WEATHER SERVICE MASTER STATION CATALOG NUMBER. THIS NUMBER IS C0OPRISED OF RLTHE SMA NUPER WITH THE OOTTION OF A SLOFIx 0 THROUGH 91. IN CASES WHERE THERE IS NO DESIGNATED WHO0 NUMBER, 0A S -0T11 NUMBER IS CREATED IN AGREEMENT WITH WHO RULES PLUS A SINYH DIGIT. THESE NUMBERS ARE ALSO REFERRED TOAS DATSAV OR USAFETAC NUMBERS WHICH UNIQUELY IDENTIFY MORE THAN 159000 REPORTING STATIONS WORLD WIDE.

By-

Distribui

( TADAO 3HOR TN[GOUP$ l &L SN~ll[S HD~fG DURALVARATONI ¥ S:a'ZZ DTAUSTG a.

STATION NO ONt SU 1 0. tONAES tA TUOC tOGTO TILO(LVIT I (VASIGA*0

ALCONBURr RAF STN ENGLAND N 52 22 W 000 13 160 EGWZ O3542

STATION LOCATION AND INSTRUMENTATION HISTORYMUNK# TYPE AT THIS LOCATION fE[IVATION AIOOV NS 011

OF GEOCAPHICAL LOCATION 9 NAME OF LATITUDE LONCITODE PERLOCATION STATION FRO To FIELD(FTI Hr BARO. OAT

1 Alconbury England RAF Sep 55 Jan 56 N 52 22 W 000 14 169 179 242 Same Same Feb 57 Apr 57 N 52 22 W 000 15 159 179 103 ame Same May 57 Oct 60 Same Same Same Same 244 ame Same Nov 60 Mar 64 Same Same Same 162 245 ame Same Apr 64 Mar 66 Same Same 161 Same 246 ame Same Apr 66 Dec 66 Same W 00013 Same Same 2L7 ame Same Jan 67 Jul 72 Sune Same S ae 163 248 Same Same Oct 72 23 Dec7 Same Same 160 Sane 2L9 Same Same 24 Dec77 Jan 82 Same Same 160 Same 22

Mon-Fri10-Sat &UK Hal

6-Sun &US Hal

10 Same Same Jan 82 Aug 82 Same Same 160 164 Sare11 Sane Same Aug 82 Jun 83 Same Same Same Sam 2412 Same Sane Jun $3 Mar 84 Same Same Same Same 2413 Same Same 28 Jun84 Sep 87 Same Same Same Same 24

NOTE:No Obs taken Apr-27 Jun 84

NONON DATE SUNTACE WIND EOUIPNT INTOONATION

Of of EUP N O T REMARKS. AtOITIONAL fOUIT ENT. OR REASON FOP CHANCE!SLOCATION CHANCE LOCATION TPE OF IPE O0E HI AlOUN

ITRARSIiTtIEN RIECORDER GROUND

1 Sep 55 Located on catwalk around control AN/GMQ-1 None 33 Ft * 22 Pin-Fri, 10 Sat & UK Holidaystower 6 Sun and US Holidays

2 15 Apr57 Located 670 ft SE of obs tower Same None GroundLevel

3 5 Apr 60 Same AN/GMQ-1 RO-2 Same4 2 Apr 62 Same Same Same 13 ft5 3 Apr 64 Located 700 ft SE of ROS AN/GM-1 RO-2 13 ft6 1 Apr 65 Located 670 ft SE of ROS Same Same Same7 r Jan 68 Dual Instrumented

1. Adjacent to approach end of AN/GMQ-lI RO-2 13 ftrnvy 122. Adjacent to approach end of AN/GMQ-l 113 ft

USAFETAC roy 1LUSAOvETA 0-t9 1101,A) pp# v Iou$ ( V I II p% or -I. , Atl 09S!OL$t[f C4'N 4DC! RlfO qVt

"SIDI

.,MSiO oi SU~RAC( ff100 (RUlPUi W1 1000If O 0|OF DT SURFACE oW rTPn Ir NN OAOVE RENAROS. ACOIIIONAL EOUIPUENT. OP PEASOM FOR CHACE

UCATIOI CNAIgc LOCATiON TIiAM O COIR ROU TYOFH__ABOVE

8 4 Jan 71 iDual Instrumented1. Located 720 ft from centerline kN/GMQ-20 RO-362 13 ftand 1560 ft from end of rnvy 302. Located 520 ft from centerline /GMQ-2 " 13 ftand 1140 ft from end of rnvy 12

9 Jun 77 1. Same Same Same 13 ft2. Same Sale 13 ft

10 25 Aug 8, 1. Same Sae Sara 13 ft2. Sam1 ft ISane Sve 13ft

11 1 Jun 83 1. Same SaMe sate 13 ft2. Sne St3f

-wy--ppp -rTTTI -/ - --

p p0p.AIAI: TTTTTAAAA

0p p A A R RT ' I

0p p : RT0pA T A A

pPPPP ALA A ARR .TYTT AA a

o APPPP A AL RRRA RA T TAA A

WEATHER CONDITIONS AMD ATMOSPHERIC PHENOMENA SUMMARIES

0WEATHER CONDITICNS SUMMARY

o 1. A PERCENTAGE FREQUENCY OCCURRENCE SUMMARY OF VARIOUS ATMOSPHERIC PHENOMENA AND OBSTRUCTIONS TO VISION,

2. DATA BASED ON HOURLY OBSERVATIONS.03. SUMMARIZED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH. MONTHLY AND ANNUALLY IALL YEARS COMBINEDI

0

ATMOSPHERIC PHEKOMENA SUMMARY01. A PERCENTAGE FREQUENCY OF DAYS SUMMARY OF VARIOUS ATMOSPHERIC PHENOMENA AND OBSTRUCTIONS

TO VISION.

2. DATA BASED ON SUMMARY OF DAY DATA.

o 3. SUMMARIZED BY MONTH WITH ALL HOURS AND ALL YEARS COMBINED.

0DEFINITIONS:

THUNOERSTORMS: ALL REPORTED THUNDERSTORMS, TORNADOES AND WATERSPOUTS.

RAIN AND/OR ORIZZLEt ALL REPORTED RAIN AND OR DRIZZLE FALLING TO THE GROUND BUT NOT FREEZING.

FREEZING RAIN AND/OR FREEZING DRIZZLE IGLAZE): ALL REPORTED FREEZING RAIN OR FREEZING DRIZZLE.

SNOW AND/OR SLEET. SNOW INCLUDING SNOW PELLETS AND GRAINS. ICE CRYSTALS AND PELLETS. AND/OR SLEET ICE PELLETS),.

- PAIL, ALL REPORTED HAIL.

ALL PRECIPITATION: THIS CATEGORY INCLUDES ALL OBSERVATIONS REPORTING PRECIPITATION. BECAUSE MORE THAN ONE TYPEo OF PRECIPITATION MAY APPEAR IN A SINGLE OBSERVATION, THE SUM OF THE PERCENTAGES IN THE INOIVIDUAL COLUMNS WAY

EXCEED THE PERCENTAGES IN THIS COLUMN.

o FOG: ALL REPORTED FOG. ICE FOG AND GROUND FOG.

SMOKE AND/CR HAZE& ALL REPORTED SMOKE, HAZE AND ANY COMNINATION THEREOF.

BLOWING SNCW: ALL REPORTED BLOWING SNOkS INCLUDING DRIFTING WHI.: REPORTED.

/OUST AND/OR SAND: ALL REPORTEO OUST. SAND. BLOkING OUST., BLOWING SAND AND ANY COMBINATION THEREOF.IH[ ATMOSPHERIC PHENOMENA SUMMARY IDATS WITH) INCLUDES ONLY THROSE REPORTS WHEN THE PHENOMENAVISIBILITY LESS THAN S/ PILES IICGO METERS?-

ALL OBSTRUCTIONS TO VISIONt INCLUDES ALL REPORTS OF OBSTRUCTIONS TO VISION IFOG THRU DUST/SAND)AND BLOWING SPRAY. BECAUSE MORE THAN ONE PHENOMENA PER OBSERVATION MAY OCCUR, THE SUN OFTHE INDIVIOUAL COLUMNS MAY EXCEED THIS COLLMN.

- mm mm mm m • o

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATHER CONDITIONSUSAFETAC FROM HOURLY OSERVATIONSAIR WEATHER SERvICE/MAC0STATION NUMBER: 03S623 STATION NAME: RAF ALCONBURT UNITED KINGDOM PERIOD OF RECORD: 78-a?

MONTH: JAN........ ........................ *........... ...........................

I RAIN FRZI2G "SNOw lOBS SMOKE OUST I OBS

HOURS I TSINS &/OR RAIN i/OR HAIL WITH FOG i/OR BLOWING 9/OR W/CBST TOTAL( ILSTIII DRIZZLE &/OR SLEET PRECIP HAZE SNOW SAND TO 08S

IDIZZLE VISION

.... ...... *.........*.................. .............. t..............00-02 -153 .7 S5 20.0 23.2 37 23.9 419

03 0S 14.2 .5 4.6 18.5 21.6 4.7 .3 26.6 74S

06:08 o14.1 .4 9.0 21.8 23.8 4.0 .5 28.3 820

09:11 .2 11.4 . 8.4 19.1 24.6 7.5 .3 ZZ.4 859

12:14 11.6 .1 8.2 18.7 20.2 8.2 .3 28.7 912

1517 12.2 .2 6.0 17.6 21.S 9.9 .3 31.8 915

o 18:20 I12.q 4.8 16.0 23.3 9.0 .4 32.6 769

21:23 1 11.0 3.7 13.9 25.2 5.5 .4 31.1 747

TOTALS .0 12.8 .3 6.3 18.2 22.9 6.1 .4 29.4 6106........ ....... . o..... . .............. .....................

STATION NUMUER: 035623 STATION NAME: RAF ALCONBURT UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: FEB

S RAIN FRZING SNOW OS SMOKE DUST % COSHOURS I TSTS SOR RAIN i/OR HAIL WITH FOG i/OR BLOWING 9/OR WCBST TOTALILSTY I ORIZZLE i/OR SLEET PRECIP HAZE SNOW SAND 10 OS

o DRIZZLE VISION

of 1 -12.0 4.8 16.3 37.1 3.5 40.6 399

03:0S 13.0 .4 5.3 17.4 40.2 S.0 45.2 682

06-Ga I.1 .6 4.2 IS.8 3.0 S.4 18.4 760

09:11 12.5 o3 8.4 19.7 34.9 13.0 41 .9 793

12-14 1 12.2 5.6 17.2 21.0 17.9 .1 39.0 830

35:17 12.9 6.3 18.5 .18.4 17.1 3!.5 037

1820I 11.2 5.1 1S.5 24.3 17.2 %1.4 TIS

21-23 9.5 6.3 11.8 27.9 13.2 41.1 684

• TOTALS 11.8 .2 S.8 16.9 30.9 11.5 .0 42.4 S6 9..................................................................................................................... .

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATHER CONDITIONSUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEINAC

STATION NUMBER- 3S623 STATION NAME: RAF ALCOMBuR UNITED KING:O PERIOD OF RECORD: 78-87

MONTH.- MAR

fRAIN FRZIN SNOW SMOKE DUST I OesHOURS | TSTMS C/OR RAIN C/OR PAIL WITH FOG C/OR BLOWING L/OR W/OBST TOTALILSTI IDRIZZLE SOR SLEET PRECIP PAZE SNOW SAND TO OBS

I DRIZZLE VISION

0 0002 11.9 2.5 13.2 33.3 1.6 34.8 446

03:S IS.3 2.0 16.5 28.9 2.8 31.7 783

06-0 I 16.3 2.9 19.1 34.6 6.0 90.6 849

o 09:11 16.4 Z.7 18.1 29.9 9.0 33. 889

IZ-19 .1 1a.? 2.5 .2 19.9 1D'S 12.5 g3.0 930

1.17 .3 18.3 2.1 .1 Z0.0 8.2 12.3 20.5 922

18-20 .1 18.1 2.1 .1 19.8 12.8 9.9 22.6 791

21-23 IS.0 2.S 16.6 17.0 6.3 23.3 739

TOTALS .1 16.2 2.9 .1 17.9 21.2 7.6 28.7 6396

0............ ..............**... ............. o ............................

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83.S5-87MONTH: APR

................... o ............................... ..

I RAIN FRZING SNOW I OBS SMOKE DUST I CBSo HOURS | TSTMS C/OR RAIN C/OR NAIL WITH FOG C/OR BLOWING C/OR U/OBST TOTALILSTII DRIZZLE C/OR SLEET PRECIP HAZE SNOW SAND 10 DOS

I DRIZZLE VISIONa *....a............ ......... .. .. .. .. .. ............0002 12.4 12.8 19.5 6.9 26.9 390

C37OS 1S.4 .S 13.S 28.9 8.1 37.0 657

C6-06 15.1 . 1S.S 33.9 10.0 f3.4 720

09-31 15.9 .8 .1 16.2 12.2 11.9 23.5 779

12-19 .1 13.9 1.3 .4 19.7 S.9 10.0 1S.9 797

Is-17 1 .7 19.8 1.7 .9 15.6 %.1 9.8 13.9 763

1$-20 .2 IS.3 1.3 16.1 6.9 13.9 29.8 690

) 21-23 12.0 1.2 12.6 10.3 9.7 ;0.0 516

TOAL I. 19.2 o9 sl 19.6 15.1 9.9 25.0 5270TOTALS................. o:oo2 .............. :9 ...... 2e 4 9:9 ...................... ::a. oe....oeooeseetee o ......e

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATOIER CONDI TIONSUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/NAC

STATION NUMBER: 035623 STATION NAME: RAF ALC04BURY UNITED KINGDOM PERIOD OF RECORD: 78-B3.85-87MONTH: MAY

A RAIN FRZING SNOW a 08S SMOKE DUST 2 OBSHOURS i TSTMS C/OR RAIN E/OR HAIL WITH FOG 9/OR BLOWING C/OR W/OBST 10TALILSTI D DRIZZLE f/OR SLEET PRECIP FAZE SNOW SAND 10 0S

I DRIZZtE VISION................................... ......... .................... ....................................................................

00-02 11.9 11.9 25.2 3.5 i8.6 '04S

03:0S .2 10.U 10.0 39.3 5.3 1.4.6 661

06-08 12.4 .1 12.5 29.6 10.3 39.9 727

09:11 1 .3 13.0 .1 13.1 11.7 11.6 23.3 778

12-14 1.9 14.9 14.9 5.1 10.0 15.1 806

15-17 1.3 13.2 .1 .3 13.4 4.3 6.8 11.1 767

18-2D .3 11.1 11.1 5.8 10.0 15.8 639

21 23 11.3 .2 11.3 12.3 6.7 19.a 521

TOTALS .5 12.2 .1 .0 12.3 16.7 8.0 24.7 5304.............................. ......................................................... .....................................................

STATION NUMBERs 03S5623 STATION NAREI RAF ALCONBURT UNITED KINGDOM PERIOD OF RECORD: 70-87MONTH: JUN

............................................... . ...............................I RAIN FBZING SNO% 2 081 SMOKE OUST OBS

HOURS I ISTS &/OR RAIN C/OR HAIL WITH FOG C/OR BLOWING C/OR WI/BSI TOTALILSTI DRIZZLE /OR SLEET PRECIP HAZE SNOW SAND 0 DOS

.2DRIZZLE VISION..................... ......................................................00-02 2 12.2 1.2 23.7 3.7 ;7.4 482

03-05 .6 11.8 11.8 40.5 3.7 -4.2 TC4

D.8 1. 21.4 11.4 26.8 7.6 34.-1 747

09:11 I. 8.7 6.7 7.8 9.0 16.8 786

12-14 1.4 1006 .1 10.9 2.7 6.2 9.0 804

15-17 2.2 14.5 I4.S 2.0 4.2 6.3 711

18-20 1 1.3 13.2 13.2 4.3 8.1 12.5 690

21- 23 .2 12.3 12.3 10.4 7.5 17.9 S86

TOTALS I .9 11.9 .3 11.9 1.8 6.3 11.1 S ol

............. 0............................. 0 ........ 00 ............ 0.0...0 ..... ••........... 0 .........

3LOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATHER CONDITIONS*uSAFETAC FROM HOURLY OBSERVATIONS

AIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO48BURY UNITED KINGDOM PERIOD OF RECORD: 78-B?MONTH: JUL

IRAIN MRING SNOW I OeS SMOKE OUST I DBsFOURS T SIMS P/R RIN CO AIL WITH, FOG E/OR BLOWING E/OR W/DeST TOTAL

GTIIDRI4ZZLE C/OR SLEET PCIP AZ SNOW SAND TO OBSIDRIZZLE VISION

................................................................................. .......... .................... ........ .......UO0-02 I.2 8.2 8.2 16.5 6.3 22.8 SYS

03-05 I0. 10.6 35.5 16.9 fc4' 797

06-08 I.1 10.1 10.46 25.5 9.5 35.3 852

209-11 1 8.7 8.7 8.0 8.7 16.7 893

12-116 .8 8.9 .1 9.1 2.3 9.4 11.7 917

S11 1 1.0 7.8 7.8 1.9 9.0 10.9 892

o 1820 I.5 7.1 .1 7.2 4.5 10.2 116.7 776

ZI-23 I.6 9.3 9.3 !10.1 8.3 18.6 675

TOTALS I.16 8.9 .0 8.9 13.0 8.3 21.3 637?............................................................................... o...... ......... ....o.o .................. ...........

STATION NUMBER: 03S623 STATION NAME: RAF ALCO46BURY UNITED KINGDOM PERIOD OF RECORD: 78-87C: MONTH: AUG

................................................ ..................... ......................... ........... ..................... ...RAIN FRZING SNOW 2 OBS SMOKE DUST 2 OBS

P' OURS I TSTMS &/OR RAIN C/OR HAIL WITH FOG C/OR BLOWING C/DR W/CBST TOTALILSTII DRIZZLE &/OR SLEET PRECIP HAZE SNOW SAND 10 081

IDRIZZLE VISIONC....................................o ................. o..............-o......................

CO0-02 I.2 8.9 8.9 21.6 3.2 168 597

C03-05 I.2 8.16 8.16 32.2 3.0 35.2 SID

06-08 I9.0 9.o 33.16 6.6 40.0 867

09-11 I .1 9.6 9.6 8.8 8.6 17.6 910

12-16I 1 10.6 10.6 1.9 8.9 10.9 93C

* - 1-IT 1 8.16 jI.. 11.0 2.1 8.6 10.7 905

16-20 I 1.3 11.1 1 1.1 16.1 13.5 11.9 793

21-23 .9 11.0 11.0 10.7 10.2 20.9 689

TOTALS I.6 10.0 10.0 14.16 7.8 ;2.2 6501

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATHER CONDITIONSIJSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-81MONTH: SEP

I - - RAIN FRZING SNOW 2 CBS SPOKE OUST I IRsHOURS TSTMS "OaR RAIN "OR8 HAIL WITH FOG C/OR BLOWING EIOR WICBST TOTAL( LST? Iz RIL 10R SLEET PRECIP MAZE SNO0 SAND TO 0BS

DRIZZLE VISION............ ............................... ....................................................

00-02 I1.3 7.3 22.8 3.6 i6.4 549

03.:05 I8.6 8.6 28.2 2.4 30.6 780

06:08 I 1 9.2 9.2 32.8 5.1 37.9 818

09-Il I .2 8.2 11.3 12.3 ;3.6 857

12r14 .6 8.7 8.7 2.6 11.8 14.4 874

15:17 I.9 9.5 9.5 1.1 14.5 15.6 854

Ic18:20 .1 5.7 5.7 4.9 21.1 26.0: 3

TOTALS I.3 8.U 8.0 14.5 10.6 ;5.1 6103

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH. OCT

I RAIN FRZING SNOW I 081 SMOKE OUST I 081HOURS I TSTMS E/OR RAIN &/OR HAIL WITH FOG 9iOR BLOWING EiOR WjOBSI TOTAL(LSTI IDRIZZLE L/08 SLEET PRECIP HAZE SNOW SAND 10 OBS

fDRIZZLE VISION

00-02 b .6 8.6 ?4.5 4.9 29.4 sss

C3-05 9.3 9.3 31.3 3.8 14.7 798

C6-08 I9.0 9.0 39.9 6.2 46.1 812

09-I11 .1 9.1 9.1 123.7 10.7 34.4 835

12-I14 9

.U 9.3 8.9 12.1 11.0 858

15-17 1 * I 10.8 10.8 6.7 12.8 19.4 839

18-20 1 10.1 10.1 6.5 13.5 ;.. 733

21-23 I7.3 7.3 12.7 10.1 Z2.7 655

TOTALS I.0 9.2 9.2 19.2 9.3 Z8.5 08.. . . .. . . . .o. .. . . . . . . . . . ... . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . ...

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATHER CONDITIONSUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURy UNITED KINGDOM PERIOD OF RECORD: 71-66

MO NTH: NOV0...... ... ....... ........................................ .............................IRAIN FRZING SNOW 2 08s SMOK DUST I OBS

HOURS 7 IS TMS &/OR RAIN 1/OR PAIL WEITH FOG 91OR SLOWIING 1/OR WICBST 1OTALoILSTJI DRIZZLE 91OR SLEET PRECIP HAZE SNOW SAND to OBSIDRIZZLE VISION

o0 0-2 I17.6 .6 18.2 23.4 1.9q i5.3 97 8

03:05 I14.9 .14 15.2 21.8 1.0 22.7 726

36-Os08 13.6 1.0 14.94 25.3 3.2 98.6 770

o 0-I I11.5 .8 11.9 21.6 7.8 95 9

12:19 I 14.5 .2 19.6 19.2 8.3 22.6 829

117I14.9 .1 14. 4. 6.7 23.5 825

18:20 I19.5 .i 19.9 18.8 7.2 26.0 71?

c21-23 1 15.8 .3 !.1 16.2 20.9 5.0 25.8 685

TOTALS I191.7 .5 a0 15.0 20.1 5.4 25.5 5815

.......... .0 ....... . ..... Ii................o..................................

STATION NUMBER: 03S623 STATION NBME: RAF ALCOMBURY UNITED: KINGDOM PERIOD OF RECORD: 77-860 MONTH: DEC

.......................... .. 0............................... .................................................................I -RAIN FRZING, SNOW 2 OBS SMOKE DUST I 081oHOURS I TSTMS L/OR RAIN 1/OR PAIL WEITH FOG 1OR BLOWING &/OR kE/CBST TOTAL

ILST) DRIZZLE LIOR SLEET PRECIP H4AZE SNOW SAND 10 DesIDRIZZLE VISIONo...........................................................

11.6 1.5 13.1 2.2 5.8 28.12 482

003::Os 13.0 2.0 15.0 29.7 4.7 ;9.5 7940

o06-OS08 11.2 1.8 12.8 .5.7 3.9 29.6 $sB

09:11 I14.2 1.4 15.1 23.7 6.7 30.4 852

12-191 It 1.0 1.9 15.7 17.1 9.0 26.S 902

15.-1? I 11.3 1.6 12.6 18.8 10.3 29.1 903

18720 I12.4 1.2 13.6 20.9 7.1 18.0 75?

217-23 I12.4 1.2 13.3 21.8 6.3 30.1 735

TOTALS I12.5 1.6 19.0 22.2 6.7 28.9 6169.......................... ............................................................................................. 0.................... L

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF WEATPER CONDITIONS

USAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/NAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURV UNITED KINGDOM PERIOD OF RECORD: 77-e?MONTH: ALL

..................................................................... ........... I..................RAIN FRZIN " SNOW .... SMOKE DUST OBS

HOURS I TSTMS C/OR RAIN C/OR HAIL WITH FOG C0OR BLOWING /OR WIOBST IOTALo WLSTI I DRIZZLE I/OR SLEET PRECIP HAZE SNO SAND 10 081I DRIZZLE VISION

..... . . ...... ...... .N e.0JAN " ' ALL 1 . 12.8 .3 6.3 18.2 22.9 6.1 .8 29.8 6186

FEB 11.8 .2 e8 16.9 30.9 11.5 .0 42.4 56980MAR .1 16.2 2.8 .1 17.9 21.2 7.6 28.7 6386

APR .1 l1.2 .9 .1 18.6 1S.1 9.9 .S.0 5270

MAY .5 12.2 .1 .0 12.3 16.7 8.0 28.7 5304

JUN .9 11.9 .0 11.9 18.8 6.3 21.1 5SO

JUL . 8.9 .0 8.9 13.0 8.3 21.3 6377

AUG *6 10.0 10.0 14.8 7.8 i2.2 6501

SEP 3 8.0 8.0 l8es 10.6 ;5.1 6103

o OCT .0 9.2 9.2 19.2 9.3 ;6.5 6085

NOV 18.7 .5 .0 1S.0 20.1 5. 25.5 SAS

DEC 12.5 1.6 18.0 22.2 6.7 28.9 6169

o TOTALS .2 1109 .0 1.5 .0 13.1 18.8 8.1 .0 26.9 71454S. .... ,............................... .................. .... ................................................

0

*0

J-ic)

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE OF OATS WITH VARIOUS ATMOSPHERIC PHENOMENAUSAFETAC FROM DAILY OBSERVATIONSAIR WEAT1ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-B?MONTH: ALL0

I RAIN FRIG SO DBS SMOKE DUST I 0BS.........................................................................................................................

I TSTMS "OR RAIN /OR HAIL WITH FOG CiOR SLOWING C/OR W/08ST TOTALZ MONTH I OPIZZLL 1/OR SLEET PRECIP HAZE SNOW SAND 7O CBS

| DRIZZLE VISION

0 JAN 6.5 6 68,6 50.1 63.3 1.3 19.0 952

FEB .2 53.% .7 20.4 .2 62.3 59.9 68.8 .5 *2.9 862

MAR 1.? 62.1 14.6 1.4 66.2 S4.8 66.6 .1 77.7 946

A APR 2.6 63.3 6.1 1.9 63.8 43.C 65.2 72.0 889

MAY 0.1 61.4 1.2 1.4 61.4 16.1 65.0 74.1 922

JUN 9.5 53.8 .1 .7 53.8 48.2 62.4 72.5 898

JUL 9.5 S1.9 .4 S4.9 45o8 63.2 71.6 930

AUG I.6 57.1 .3 S7.1 56.2 63.8 75.1 9300SEP 9.6 54.9 .3 54.6 56.2 68.4 76.8 915

OCT 1.0 56.0 .1 56.0 62.1 69.1 77.9 932

NOV 1.2 6S.4 1.5 66.2 6.14 62.4 .1 71.6 910:0DEC .1 62.7 .3 10.5 .3 66.0 59.0 63.9 .2 .1 79.5 953

o TOTALS 3.9 58.8 .2 6.S .6 60.9 53.6 65.2 .2 .0 76.2 11039..............................................................................................................................................

0

,L. *.

,lcipAAAA RFMRR ITTTTI$asse-opprp AAAAARRR:, TTTTTT: se

pppppppp AAALL ASRERA N ITI ggm

ppPPPP AAA L IUARAA T1T msuaa

opp aP LA AL RE ER IT IPP PP A A: U E It D S

pPPPP AA AL EAEP TV :::::::::a

0

0

PRECIPITATION. SNOWFALL AND SNOW DEPTH SUMMARIES

0PERCENTAGE FREQUENCY OF VARIOUS DAILY AMOUNTS OF PRECIPITATION 4SNOWrALL AND SNOW DEPTH) SUMMARIES:

o THESE SUMMARIES DERIVE FROM SUMMARY OF DAY DATA.

DATA IS sUPMARIZED MONTHLY AND ANNUALLY WITH ALL YEARS COMBINED.

DISPLAYED ARE: PERCENT OF DAYS WITH MEASURABLE AMOUNTS, A PERCENT Of OATS wITV NO AMOUNTS, TRACES, GIVEN AMOUNTS,MEANS, GREATEST AMOUNTS AN0 LEAST AMOUNTS ITME STATISTICAL VALUES ARE NOT INCLUDED IN THE SNOWo DEPTH SUMMARY BECAUSE OF THEIR DOUBTFUL AND LIMITED VALUE|.

ALSO PROVICED ARE THE OBSERVATION COUNTS.0A VALUE OF %.D" IN THESE TABLES INDICATES LESS THAN .052 WHICH USUALLY INDICATES ONLY ONE OCCURRENCE.

0EXTREME DAILY AMOUNTS OF PRECIPITATION ISNONFALL AND SNOW DEPTHI SUNARIES

O DATA DERIVED FROM SUMMARY OF DAY DATA

PRESENTED ARE THE EXTREME DAILY AMOUNTS OF PRECIPITATION. SNOWFALL AND SNOW DEPTH BY INDIVIDUAL MOKTH AND YEAR.0ALSO PRESENTED ARE THE MEANS. STANDARD DEVIATIONS AND TOTAL OBSERVATIONS COUNTS.

o AN ASTERISK "*0 PRINTED IN THE TABLES INDICATES THAT THE EXTREME VALUE FOR THAT YEAR AND MONTH

DERIVES FlICM AN INCOMPLETE MONTH OAT LEAST ONE DAY OF THE MONTH IS MISSINGI.

VNEN A MONTH HAS VALID OBSERVATIONS REPORTED BUT NO OCCURRENCES. ZEROS ARE DISPLAYED IN THE TABLES:

EXTREPE DAILY PRECIPITATIONt ".00" EQUALS NONE FOR THE MONTH IHUNDREOTHSI0EXTREPE DAILY SNOWFALL: ".0" EQUALS NONE FOR THE MONTH ITENTHSP

EXTREPE DAILY SNOW DEPTH& D0" EQUALS NONE FOR THE MONTH IWHOLE INCHES)

TOTAL MONTHLY AMOUNTS OF PRECIPITATION AND SNOWFALL SUMMARIES

DATA DERIVED FROM SUMMARY OF DAY DITA.

DATA PRESENTED BY YEAR AND MONTH.

ALSO PRESEATED ARE THE MEANS, STANDARD DEVIATIONS AND TOTAL OBSERVATION COUNTS.

AN ASTERISM ":" IN WHE TABLES INOICATES THAT ONE OR MORE DAYS WERE MISSING FOR THE MONTH.

NO OCCURENCES FOR THE MORTH ARE INDICATED BY ZEROS.

I IF THE ANOLUT IS A TRACE, THEN "TRACE" IS PRINTED IN THE TABLES.

STATISTICAL VALUES DO NOT INCLUDE MEASUREMENTS FROM INCOMPLETE MONTHS.

0m

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Of OCCURRENCE OF PRECIPITATIONUSAFETAC FROM SUMMARY OF DAY DATAAIR WEATHER SERVICE/MAC

STATION NUMBERt 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 55-67.................................................................... AHLN ';N H"S........................

O AMOUNTS IN INCHES

I I 1 1 .021 .061 .11 1.26 I .51 I 1.011 2.51 I S.01 1 10.011 OVER I % OAYS! TOTALI PONTNLV AMOUNTS0 I I I I T01 101 TO I TO I TO I TO I TO I TO I TO I I WIT14 I I

MONTH I NONE iTRACEI .01 i .051 .101 .25 1.50 1 1.001 2.50! 5.30 1 10.001 20.001 2".00 I PEAS I DES I0 I ..... ... t. . I AMTSI t MEAN GRLATEST LEAS

I I I IJAN 1 29.9 1 21.31 S.9 119.21 6.91 13.21 5.51 1.6 1 1 1 1 1 1 99.3 1 9521 1.91 3.27 .69

) I I I I I I I I I I I I I I IFEE I 36.1 1 23.41 5.1 113.1 7.61 9.01 f4.1 1.2 1 1 1 C.5I 816! 1.33 3.58 .08

I I I I I I I I I I I ICl MAR 1 31.6 1 23.81 7.0 112.81 8.21 9.81 5.11 1.3 ,1 *9 1 1 9.6 1 9251 1.88 5.1% .17

I I I I I I I I I I I I I I I IAPR 1 33.1 19.71 7.1 112.4110.1 10.91 5.91 *9 .1 1 1 1 17.2 1 8661 1.69 3.96 .00

()I I I I I I I I I I I I I I I IMAY 1 37.1 1 20.91 4.8 112.11 6.Si 11.71 5.11 1.9 1 S I I I I I 42.5 1 9221 1.85 9.21 .47

JUN I 44.G1I 17.91 5.1 110.61 5.01 8.91 5.21 2.6 1 1.1 1 1 1 1 1 38.6 1 8971 2.21 5.26 .02I I I I I I I I I I I I I I I I

JUL I 2.8 I 22.21 9.6 I 9.3! 5.51 7.81 5.71 1.9 1 .8 1 1 I 35.0 9291 1.89 1.97 .03I I I I I I I I I I I I I I I I

AUG 90.3 19.11 6.8 111.51 S.51 9.01 9.71 1.8 1 1.2 1 1 40.5 1 9301 2.16 9.99 .4LI I I I I I I I I I I

) SEP 49.0 20.11 9.0 1 9.11 S.71 9.61 9.91 2.0 1 .6 1 1 1 1 35.9 I 8951 1.87 3.83 .03I I I I I I I I I

OCT 1 42.9 1 18.4 9 1,1281 6.81 8.91 3.91 2.3 1 .1 1 I 38.7 I 9141 1.67 9.98 .16

I I I I I I I I I I I INOV 1 31.8 1 20.7! 6.6 113.91 6.41 12.11 6.01 2.2 1 .1 1 1 1 17.6 1 9001 1.93 9.30 .63I I I i I I t

) DEC 31.2 1 2311 5.8 112.61 771 12.91 9.81 ,.7 1 .3 1 1 I 415.8 I 9S2! :..n 5.15 .%I I I I I I I I I . I I I I

........ ................................................... ...... ...... ............ .............oANN 1 37 .0 I 20 8 ! 5 6 112 1 1 7 0 ! 10 2 ! 5 .1 ! 1 7 I o.9 I I 1 2 2 I 10930 1 2 .*39

7

'0O

K)l

9!

o GLOBAL CLIMATOLOGY BRANCm EXTREME VALUES OF PRECIPITATIONUsAFTaC IFROP OAIL

V OBSERVAITIONS1

AIR w[ATPER SERVICE/MAC

STATION NUBER: 03S623 STA71ON NAME: RAF ALCONBURY UNITED SINGOOM PERIOD OF RECONO: S5-@7

24 HOUR AMOUNTS IN INCHESI -O-N-T-m-S- ALLo EAQ JAN FEB MAR APR "AT JUN JUL AUG SEP OCT NOV GEC MONTHS

............................................................................................................................................3.33 .66 .30 .22

56 * .. 88 .31 1.02 *S4 .oe .56 .65

58 7 S*3 .43 .34 .38 1.15 .3 .50 .52 .6 .41 .35 1.1559 .60 .O6 .43 *16 .3% .28 1.30 .16 .03 .77 .49 .61 1.3060 I So .51 1.37 .12 .70 .98 .77 62 1.12 .72 .7s .61 1.37o :31 :27 :16 :36 :2 :70 .38 .32 .41 35 s51 .74 .7%

*2 30 17 027 S4 0 03 .9 :.7 .S3 .44 15 .7 .7463 *38 .26 1.6, .32 .48 SO .43 .82 .85 .62 .39 .15 1.65644 .31 lZ 1.33 .37 .23 .86 .47 .55 .7S .11 .29 .22 1.3365 .33 .18 .41 .28 .36 .34 .47 .49 1.07 .20 .56 .60 1.07

.21 .5? *29 :392 .3 12 1.01 .69 .ss .s7 2.2%67 .20 .56 .S1 .4 .70 1.03 .69 .37 .24 .59 .29 .37 1.0368 .39 .35 .19 .41 .57 .52 2.06 1.78 1.41 .68 .36 .32 2.089 i .71 *83 .98 .21 1.27 .91 .78 .22 .09 .2S .70 .25 1.2770 S.2 .3s .73 .*9 .71 1.77 .37 1.75 .5 .30 .78 .28 1.77o 71 .92 .18 *Sr *68 .78 .6% .20 .67 .27 .93 .0 .41 .9372 1 .3S ,18 .42 .56 .20 .51 *.02 *.12 .85 .7973 .17 .31 .22 .41 .67 1.1S 1.60 .23 .28 .31 .28 .29 1.6037 *37 .8c .14 .14 .33 067 .77 1.06 .71 .S4 1.05 .20 1.06?S .7 .21 .57 .37 !.aS .26 .4% .16 .80 .07 .28 .9 1.0576 :22 .20 *19 .s .SO ,38 1.01 2.07 1.30 .6S .1% .64 2.07o 77 .61 .60 .2S .51 .22 *9I .18 3.27 .13 .31 .37 .76 1.2778 .33 .32 *3s .33 .72 .85 .99 .SS .S2 .10 .23 1.23 1.2379 I 1 .55 o98 .92 *1.35 .o21 .32 .6S .32 .8S .19 *1.01 .1.3S80 *.63 .37 .59 .3S :57 o31 0.13 1.16 .22 1.29 *5.2 *.2 1.2981 *.50 6,53 1.20 .1.32 5.S7 *Sl *.30 .67 *SS 5.93 *.40 *.2S 01.3282 *.S2 *22 *8 : .26 1.3S .1,11 :33 .%7 *.12 *.9 .3783 ,37 .2S .61 76 .65 1.53 .52 .20 .5 .39 .35 .28 I.S38S I ,5 .57 .57 '.0a .16 0I .82 .16 .78 5.2?

............................................: . .... 1. .... :!..... :.. ..... . .........

NOTE O aBASED ON LESS THAN FULL MONTHSI

CONTINUED ON EXI PAGE....

0

L.

GLOBAL CLIMATOLOGY BRANCH EXTREME VALULS OF PRECIPITATIONUSAFETAC (FROM DAILY OBSERVATIONS)AIR EATPER SERVICE/AC

STATION MUPKR: 035623 STATION MAES RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-87

...............................................................................................................

29 HOUR AMOUNTS IN INcI(SI *-MON-T1-H-S- ALL

YEAR JAN FEB MA R APR MAY JUN JUL AUG SEP OCT NOV VE C MOMNTHS

85 I .1? e93 .27 *.90 .32 .60 .6? .31 .21 .25 .57 1.0? 1.07

B6 .*32 .90 *.39 .33 1.09 .20 .19 1.19 .89 .56 .60 .44 1.1987 o63 .27 .39 .S9 .37 2.C2 .36 .97 .3S

9E[AN 1 .7 .561 .393 .583 .8 9 .18 .5 *5A? .99 .961 2*13?

S.0. I .185 .190 .395 .153 .315 .511 .911 .S .369 .205 *218 .;69 .430TOTAL 6BS 92 046 92S 868 922 897 929 930 89 919 900 952 10930

NOTE 0 (BASED ON LESS 7hAN FULL MONTHS)

0

0c

C,

iC

)

L.

GLOBAL CLIMATOLOGY BRANCH MONTHLY PRECIPITATIONUSAFETAC IFROM DAILY OBSERVATIONSIAIR ¥EATPER SERVICEI/AC0STATION NUSERs 03S623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-87

.. .... ............ ....... ....o; ; .... ... ............................. ... .... ...... ..TOTAL MONTHLY PRECIPITATION IN INCHES

| -M-ONeT-H-S- ALLO YEAR JAN FEB PAR APR MAY JUN JUL AUG SEP OCT NOV CEC PONIS

.............................................................................SS 0.33 1.92 1.07 1.37

0 16 *2.0357 . *.Oo 1.81 1.99 1.86 1.65 3.01 1.91 1.28 1.39so 2.86 2.41 lss .68 1.61 9.97 1.38 1.72 2.96 1.6s 1.23 1.92 29.959 2.55 .03 1.59 1.00 .97 .67 9.16 .51 .03 1. Se 2.36 3.6? 19.0560 2.21 1.91 2.1 .33 1.20 2.76 2.5 2.11 3.83 9.31 3.61 2.45 29.6161 2.00 1.72 .17 2.17 .92 1.20 1.90 1.11 1.75 2.15 1.18 3.96 19.7362 1.66 .69 *6 1.96 1.39 .10 1.-8 1.90 2.75 .98 1.11 1.86 16.8163 1.66 .60 3.69 2.16 1.83 1.67 1.37 2.77 2.29 1.32 2.96 .99 22.9369 .86 .71 3.19 2.00 1.06 3.78 1.35 1.33 1.13 .93 .97 .98 17.79

)6 1.75 .60 2.95 1.53 1.90 1.78 1.93 1.87 3.2S .39 2.11 3.S1 22.5966 1.09 Z.29 .S3 3.11 1.97 3.10 2.26 3.99 1.99 2.s 1.86 2.26 25.8267 .77 2.06 1.21 1.92 3.a% 1.29 1.6S 1.99 1.9 3.31 1.2S 1.61 21.0368 1.17 .97 SS 1.15 1.33 2.06 S.9? 9.28 3.71 1.90 1.99 1.59 2S.5569 2.97 2.28 1.92 1.01 9.21 1.67 1.79 1.S1 .27 .91 2.81 1.62 21.7170 2.83 1.97 1.90 2.92 1.10 2.69 1.63 3.96 1.91 .7 9.07 1.30 26.9671 3.27 .91 1.31 1.S9 2.09 2.70 .99 2.01 l.J? 2.90 1.56 I.OS 20.2072 2.27 1.15 2.00 1.os 1.20 1.S9 *.03 4.16 2.66 2.9073 .6 .69 S6 1.72 2.69 3.20 9.16 RS5 1.89 1.05 .99 1.33 19.6279 1.99 2.10 .70 .9 1.05 2.35 1.92 9.36 2.66 3.19 9.30 .97 26.0275 1.99 .61 3.5s 2.29 3.08 .79 2.07 .91 2.53 .23 1.17 1.31 20.0S76 .9 .S6 .59 .2 1.41 .9 1.26 2.71 3.66 9.96 2.16 2.30 21.3077 2.59 3.56 1.61 1.1 .90 2.69 .91 9.99 .19 .63 1.36 2.19 22.6176 1.90 1.31 1.S0 1.56 2.05 2.09 2.38 1.86 1.20 .17 .63 5.11 21.6279 2.96 2.07 3.67 2.79 03.00 0.89 079 2.17 7S 2.S6 1.3S *3.63 026.13o0 *1.7 2.93 3.10 .92 .96 2.36 *3.92 2.66 .50 2.7 01.60 01.99 *23.961 01.67 .1.31 5.19 03.40 02.70 1.37 *1.21 1.31 2.62 *2.56 01.52 0.91 .25.79

62 *2.30 .96 3.09 .73 2.9S S.06 .66 Z.10 0.22 *1.91 1.7983 1.5s 01.92 1.90 3.98 3.1S 3.52 1.56 .90 2.36 1.92 1.99 1.17 *23.2969 3.02 1.96 1.99 0.02 .28 .97 3.23 .6 3.09 01.01

...... .......................................................................................

NOTE 4 9ASED ON LESS THAN FULL MONTHS

CONTINUED ON NEXT PAEe....

0

C)

kL

GLOBAL CLIMATOLOGY BRANCH MONTHLY PRECIPITATIONUSAFETAC (FROM DAILY OBSERVATIONSIAIRl WEATHER SERVIC[fMAC

STAI1N NU RB:t M 03S623 STATION NAME: RAF ALCONBuRY UNITED KINGDOM PERIOD OF RECORD: S5-87

TOTAL M ONTHLYI PRECIPITATION IN INCHES$

| -M-O-N- T-HS- ALL

o YEAR | JAN FEB MAR APR MAY JU JUL AUG SEP OCT NOV DEC .ONT HS

aS I 1.69 *53 11. *39 1.65 3.36 1.85 .50 .61 1.27O Be i 1.71 .97 *1.36 2.76 3.05 .71 1.56 3.82 1.02 1.62 2.0 1.62 .22.62

a? I 1.03 .79 1.59 .178 1.63 5.26 2.11 3.17 .90S. ... . ....................................... ..

1E:;N 3 1097 1.334 1.679 1.692 1.649 2.2c6

1.869 2.160 1.874 1.669 1.93f 22.299S.D. I *720 .'833 1.205 .832 .929 1.234 1.151 1.246 1.125 1.176 .964 1.E36 3.287

TOTAL 06S I 9S2 846 925 668 922 897 929 930 895 914 900 952 10930C.... ...........................................................................................

NOTE (BASED ON LESS THAN FULL MONTIPSI

o

0

0

0J

0

0 mimi l mlIllr IIIN

0

GLOBAL CLIMATOL06Y BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SNOWFALLUSAFETAC FROM SUMMARY OF DAY DATAAIR WEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-87... .............. ... ................................................"" " " ' " " : ;,; '; ' s"'"... ............... .......... ... . ......"" "" " " " ' " ' "O AMOUNTS IN IMCIPLS

| I |I 0.1 1 0.S 1.S 2.5 1 3.51 4.5 1 6.5 1 10.S I IS.5 I 2S.5 I OVER I % DA1SI TOTALI PONTFLY AMOUNTSI I I T I Tol To! TO I To 10 I TO TO I TO I TO I I WITH I

MONTH I NONE ITRACEI 0.4 I 1.11 2.41 3.4 I 4.41 6.4 I 10.41 15.4 I 25.4 I 50.4 I Sf.4 I HEAS I OBS II I I I I I I I I I I I AMTS I MEAN GRLATEST LEAS

ot i I I I I I I I I I IIIIJAN I 76.S 1 13.41 2.2 1 3.31 1.51 .91 .21 I 8.1 I 9521 3.0 31.2 .0

I I I I I I I I I I I IFED I Is. 1%.31 3.6 1 2.21 .71 .Sl .51 .2 1 1 7.7 1 64sl ;.3 14.1 .0

I I I I I I I I I I I I IMAR I 64.e 12.61 1.2 1 .41 .61 I 1 .1 1 .1 1 1 1 1 2.5 1 9251 1.0 7.4 .0

I 1 I I I 1 1 I 1 1 1 1 I IAPR 1 93.5 5.11 .9 1 .61 1 1 1 1 1 1.5 1 8891 .2 1.5 .0

I I I I I I I I I I I III I IMAT 196.9 1.11 9221 TRACE TRACE 0

I I I I I I I I I I I III I IJUN 199.9 1 i9I I I I I 1 1 898TRACE TRACE .0

C 'I I I I I I I III I I I I I IJUL 1110.0 1 1 1 1 1 9291 .0 .0 .0

I I I I I I I I III I I I I IC" AUG 1100.01 1 1 1 1 1 9301 .0 .0 .0

I I I I I I I I I I III I I ISEP 1100.01 1 9091 .0 .0 .0

I I I I I I 1 I I I I III I IOCT 199.9 1 I I 1 1 91a4 iTRACE TRACE .0

I I I I I I I III I I I I I I" NOV 1 94.7 1 4.11 .7 1 .31 .11 1 .11 1 1 1 1 1 1.2 1 9011 .3 S.C .0

I I I I I I I I I I I I I I IOEC 1 4.5 1 6.0! 1.S I 1. a .5! .21 .11 I. .2 1 I I 1 3.6 1 956! 1.2 12.7 *0

I I I I I I I I I.... ..............................................................

664 I 93.1 i 4.91 .6 I .6! .31 .11 .11 . I .0 I I2.0 1 1096 b.0

2j

i e i_

J -'J

GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF SNOWFALLUSAFETAC IFROM DAILY OBSERVATIONS)

AIR MEATEAER SERVICEILAC

0 STATION NUMBER: 035623 STATION NAME: RAF ALCONURY UNITED KINGDOM PERIOD OF RECORD: SS8TR

S0 1.0c 4.5 6.0 .3 .0••• .0 * •. .0 •• .Y•••• e•

21, "OUR AMOUNTS IN INCHES|-M-O.N-T-H-S- ALL

Y) EAR | JAN FES MAR APR MAy JUN JUL AUG SEP OCT NOV DEC MONTHS

59 .00 TR0 TRCE5 6 $3.0

ST . TRACE *.0 .0 .0 .0 .0 .0 .0 .0 TRACEso T.A 4.0 6.0 .3 .0 .0 .0 0 ,0 .0 .0 .4 b.0o 59 2.0 1 .8 .0 .0 .0 .0 .0 0 *0 TRACE .0 7.060 2.8 1 0 TRACE TA .0 .0 .0 .0 .0 .0 .0 .8 2.8

6 1.5 TRACE 2.2 TRACE .0 .0 .0 .0 .0 *0 .0 .5 2.2

O 65 1.9 .7 2.2 D0 .0 .0 .0 .0 .0 .0 1.5 .0 2.266 1.4 2.4 *1 1.1 .0 .0 .0 .0 .0 .0 TRACE TRACE 2.467 .3 TRACE TRACE TRACE TRACE .0 .0 .0 .0 .0 *0 2.4 2.468 3.0 TRACE TRACE 1.1 .0 .0 *0 .0 .0 .C .0 .8 3.069 I.S 5:3 .3 TRACE *0 .0 .0 .0 .0 .0 37 1.7 5.37C 1. 3.5 7.3 .8 .0 .0 .0 .0 .0 .0 .2 1.1 7.371 TRACE .1 1.0 .0 .0 .0 .0 .0 .0 .0 .4 TRACE 1.072 TRACE 1.2 .5 .0 .0 .0 '* 0. . .0$ , 1 .2 TRACE .s TRACE .0 .0 .0 .i .0 .6 TRACE .6

7 :0 TRACE *1 .V .0 .0 .0 .0 * TRACE .0 .5 .575 I .6 .0 .2 .2 *0 TRACE .0 .0 .0 .0 *0 TRACE .676 TRACE .1 TRACE c" .0 .0 .0 .0 .0 .C .0 3.2 3.2

C' 77 3.6 1.8 TRACE TRACE .0 .0 .0 .0 .0 .0 TRACE .0 3.678 1.4 2.0 1.5 TRACE .0 .0 .0 .0 .0 .0 TRACE .6 2.079 4.0 3.4 1.9 TRACE *TRACE 0.0 .0 .0 .0 *0 .0 *TRACE 4.0aO SC '1.2 TRACE TRACE .C .0 .0 *.0 .0 .0 .0 *TRACE *TRACE '1.281 $W1. 1.2 TRACE *TRACE .0 .(1 *.0 .0 .0 *.a '.0 *4.3 *4.382 03*3 1.0 TRACE .0 TRACE .0 .0 .0 0.0 'TRACE TRACEo 3 1.8 '3.1 TRACE TRACE .0 .0 .0 .0 .9 C .0 TRACE *3.184I 2.6 TRACE TRACE *.0 .0 .0 .0 .0 .0 '.0

NOIE I ERASED ON LESS WVAN FULL MONT1,SI

o CONTINUED ON NEXT PALE....

0

0

ui .

SGLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF SNOWFALLUSAFETAC IFROM DAILY OBSERVATIONS1AIR WEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PEOIOD OF RECORD: 55-87

............................................................................................................................24 HOUR AMOUNTS IN INCHES

I MO.N-T-P-S- ALLY TEAR I JAN FEB MAR APR MAT JUN JUL AUG SEP OCT NOV DEC MON T11S

•I 3 3.9 TRACE *TRACE RAE TRA 3.98) 86 J 1.9 4.0 *TRACE *2 TRACE .0 *0 .0 .C *0 TRACE TRACE 4.087 I 1.7 .3 .s TRACE TRACE .0 .0 .0 .0

P EA | 1.32 6 E TRACE 0 A? $7S.D. 1.226 1.568 1.753 .33C .000 .Co0 .000 .00 O .000 .759 2.E06 2.253

TOTAL oB5 I 952 BA5 925 B89 922 898 929 930 909 914 901 954 10968

NoTE O (BASED ON LESS T14AN FULL MONTHSI

Cj

Ch

IC)

0 GLOBAL CLIMATOLOGT BRANCH MONTHLY SNOWFALLUSAFETAC (FROM DAILY ObSERVATIONS1

AIR bEA7ER SERVICE/MAC

STATION NUPBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-87

TOTAL MONTHLY SNOWFALL IN INCHES

-M-O-N-T.H-S- ALL

YEAR I JAN FEB MAR APR MAy JUN JUL AUG SEP OCT NOV EEC MONTHS

55 1 **0 .0 .0 TRACE56 1 .5.7

57 1 *TRACE *.G .0 .0 .0 .0 .0 .0 .0 TRACE

58 1. 6.1 6.0 .3 .0 .0 . 0 1 . .0 .0 1.0 14.47159 3.6 .1 .0 .0 .0 .0 .0 .0 .0 .0 TRACE .C 3.6

60 A 4.7 1.5 TRACE t) .0 .0 .0 .0 .0 .0 .0 .8 7.061 TRACE .0 .1 .' .0 .0 .0 .0 *3 .0 .0 9.5 9.6

62 2.6 .1 1.1 *c .0 .0 .0 .0 .0 3 7.6 14. 463 11. 3.7 TRACE TRACE .0 .0 .0 .0 .0 .0 .1 .2 15.164 2.5 TRACE 2.3 TRACE V' .0 . .0 0 .0 .9 5.765 0*. .9 4.0 .0 .0 .0 Do 0 .3 .0 15 . 10.666 3.9 3.4 .1 1.4 .0 .0 .0 .0 .0 .0 TRACE TRACE 8.8

67 . R TRACE TRCACE A TRACE 0 .0 .0 .0 .0 .0 2.5 2.9

68 5.2 TRACE TRACE 1.5 .0 .0 .0 .0 .3 .0 .0 .9 7.6

69 1.5 14:1 .3 TRACE .a .0 .0 .0 .0 .0 5.G 3.8 24.770 1. 0 7.1 7.4 1.5 .0 .0 .0 .0 .0 .0 .2 1.3 16b.5

71 TRACE .1 1.0 .0 .C .0 .0 .0 .0 .0 .5 TRACE 1.6

72 TRACE 1.2 .5 .0 .0 .0 '.0 *.0 .0 .073 .1 .4 TRACE .5 TRACE .0 .0 .0 n0 .0 .6 TRACE 1.6

r" 74 .0 TRACE *I .0 .0 .0 .0 .0 .0 TRACE .3 .5 .6

75 .6 .3 .2 .5 .0 TRACE .0 .0 .0 *1 .0 TRACE 1.3

76 TRACF ,1 TRACE .0 .0 .0 .0 .0 .0 .0 .0 !:2 3.3

71 .6 1a TRACE TRACE *0 0 ,3 .0 .0 *c TRACE .0 5.478 1 .4 2.6 1.5 TRACE .0 .0 *O .0 .0 .0 TRACE .6 6.1

79 10.5 6.9 4.3 TRACE *TRACE -. 0 .0 .0 .0 .0 .0 *TRACE 021.79c 1 01.3 TRACE TRACE .0 .0 .0 *.0 .0 .0 .0 *TRACE *TRACE *-13

81 '1.2 1.8 TRACE *TRACE *.0 .0 -. 0 .0 .0 '.0 .0 *.7 '15.7

82 '5.2 1.0 TRACE .c TRACE .0 .0 .0 **. *TRACE TRACE

83 1,8 *6.8 TRACE TRACE .0 .0 .0 .0 .0 .0 .0 TRACE '8.6

84 5.8 TRACE TRACE 4.0 .0 .0 .0 .0 .0 .. 0

NOTE I BASED ON LESS THAN FULL MONTS)

CONTINUED ON KEXT PA(,E....

GLOBAL CLIMATOLOGY BRANCH MCNTHLY SNOWFALLUSAFETAC (FROM DAILY OBSERVATIONS)AIR WEATIjER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCONBURT UNITED KINGDOM PERIOD OF RECORD: 55-07

0

TOTAL MONTHLY SNOWFALL IN INCHES

EAR JAN 1. ' TA AR .A . .0 0T0 ER| A EB Hg AP ~ UN "]IV AUGA SP OCT NOV EC O. F

O 86 I Z.9 5.7 *TRACE .2 TRACE .0 .0 .0 .0 .0 TRACE TRACE *8.8aT I 2.1 .4 .9 TRACE TRACE .0 .0 .0 .0

................................................ ..............................................................................................SMEAN 3.01 2.26 1.03 .22 TRACE TRACE .00 .00 .00 TRACE .31 1.21 8.13

S.D. I 3.322 3.213 1.942 .472 .000 .000 .000 .000 Co0 .000 .984 2.359 6.472

TOTAL OBS I 952 845 925 889 922 898 929 930 909 914 901 954 10968

NOTE ( (BASED ON LESS TF'AN FULL MONTHSI

uid

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF

SNOW DEpTHUSAFET4C FROM SUMMARY OF DAY DATAAIR WEATHER SERV]CE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONbURY UNITED KINGDOM PERIOD OF RECORD: 55-87................................................................ ...............................................................

0 AMOUNTS IN INCHESI I I I I I 7 I 13 I 25 I 37 I 49 I 61 l OVER I 2 DAYS[ TOTAL( PONTPLY AMOUNTSI I I I I TE T TO TO I TO I O I To To I I WITH I

MONTH I NONE ITRACEI 1 1 2 I 3 1 6 1 12 I ZR I 36 I 48 I 60 I 12C I 12 1 I MEAS I OS II I I I I I I I I I I I AMTS I I MEAN GRLATEST LEAS'

JAN 1 82.1 1 7.41 2.3 1 2.31 2.11 3.41 .41 1 1 I 1 1 I 10.5 I 9s11I I I I I I I I I I I I I I I

C) FEB 1 85.6 I 3.81 4.7 1 3.41 1.41 1.01 .11 1 1 1 1 1 10.6 83,41I I I I I I I I I I I I I I I I

MAR 1 96.4 2.31 .5 1 .31 .11 .31 1 1 1 1 1 1 I 1.3 I 9461

APR 99.6 3 1 1 1 .11 8891I I I I I I I I I I I I1I IIMAY IICO.0 1 1 1 1 9221

JUN 1100.01 1 1 1 1 8981

JUL 110.0 1 1 1 1 1 9291

AUG I 1 CG.o 1 1 9301

SE P 1100.01 1 9091

OCT I110.O1 I 9141

I I I II I I INov 1q 98.8 1 121 9011

DEC 94.9 1.81 1.7 1 .41 .21 .81 .21 I 1 1 3.4 1 95412I I I10977.................................................." " """:.... :;:T" ....... ... ....................................... " """" " "SANN I 96.4q 1.41 .8I.1 3 5 .11 I I I I I I 2.2 I 109771

0

1'

C).i

*

O GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF SNOW DEPTHUSAFETAC (FROM DAILY OBSERVATIONS)

AIR WEATER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME. RAF ALCONSURY UNITED KINGDOM PEPIOD OF RECORD: SS-07

.. .. ... .. ... ..... ..... ... ... .. ... .. ... . ........ ........ .......... ... ........."' " "" "DAILY SNOW DEPTH IN INCHES

I -M-O.N..T-."-S- ALLY TEAR I JAN FEB MAR APR MAy JUN JUL AUG SEP OCT NOV E.C MONTHS

551 *0 0 0 0o 56 l *4

571 *0 *1 0 0 0 0 0 05B 1 2 1 0 0 0 0 8 0 0 0 1 2o 59 1 0 0 0 0 0 0 0 0 0 0 a I60 3 G 0 D 0 0 1 0 D 0 0 1 361 0 0 0 0 0 0 0 0 0 0 C 1 7

o 62 1 2 TRACE 0 0 0 0 0 0 a 0 7 a63 7 2 TRACE 0 0 Q 0 0 0 0 0 TRACE 764 0 0 0 a 0 0 0 0 0 0 n

o 651 0 0 a a 0 0 0 0 a 0 n 0 066 0 0 0 0 0 0 0 0 0 0 0 0 o67 0 0 0 0 0 0 0 0 0 0 0 0 O

0 68 3 0 a 1 0 0 0 0 0 0 0 1 369 TRACE a I 0 0 0 a 0 0 0 TRACE TRACE aTO TRACE 4 S TRACE 0 0 0 0 0 0 0 Z S

C) 71 0 TRACE 0 0 o 0 0 0 0 0 TRACE 0 TRACE72 *TRACE C TRACE 0 0 a sO so 0 073 0 TRACE 0 0 0 0 a 0 0 0 TRACE 0 TRACE74 0 0 0 0 O 0 0 0 a 0 0 0 075 1 0 1 0 a 0 0 0 0 0 0 a I76 1 0 O 0 0 0 0 c 9 1 1771 TRACE 2 0 0 O 0 C 0 0 a 0 0 27s 2 2 2 TRACE 0 a 0 0 0 0 TRACE 1 279 6 4 2 0 *0 *0 0 0 0 0 0 STRACE 6

- 80 1 *TRACE a a 0 0 0 .0 0 0 0 *TRACE 00 *TRACE81 *TRACE 1 0 *c *0 a .3 0 0 *0 *0 *5 *S82 *S TRACE 0 0 0 0 0 0 *0 s0 0

C 83 2 *3 0 0 0 0 0 0 a 0 0 0 *384 3 a 0 *0 a 0 0 0 0 *0

NOTE 0 IBASED ON LESS THAN FULL MONTHS)

CONTINUED ON NENT PAbE....

C)

GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF SNOW DEPTHUSAF ETA C IFROM DAILY OBSERVATIONS)AIR WFATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF PECORD, 55-87

.. .... .. ....... ... ....... ..... ... .. .. .. ....................i; : : ;,; . ; ; .. .........DAILY SNOW DEPTH IN INCHES

I -M-O.N..T-H-S. ALLo YEAR I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOv CEC MONTHS;.. .. ... .. ... . . .... ....... ......... ............... . ;..... .... ..... ... ...... ; ....... ...as 4 4 0 so 0 0 0 0 n 0 ?RACE 0

S861 2 s *TRACE TRACE 0 0 0 0 0 487 I 2 TRACE TRACE O o a 0 0 0

.. . . . . . . . . . .. . O " :; . ... .. . . ; . . .. . . . .

ME ..... ;; ...... : . :0 . .. . .:; ...... :; ...... :; .S.O. Z.206 1.974 1.053 192 .000 .0D0 .000 .000 PO DOD .000 l.67 2.910

TOTAL OBS l 951 834 9416 889 922 898 929 93C 909 914 901 954 10977......................................................................0o ....................................................

NOTE S IBASED ON LESS THAN FULL MONTHSl

:0

KK_.

-- W0' m am

pp1ppp 14 -J T-TTTI ---- -

p :

0pppAA:R.:: TTTTTcccc

pp p X A a RT c c

0p A : :R Tc

0pppp Vc

ppPPP A L AA RRA RR TTITI cccccc

o PPPPPPPP ALALAAL RIRIRRI ITIIII

0

0

SURFACE WIND SUMMARIES

0EXTREME VALUES CF PEAK WINDS

o DATA DERIVED FROM SUMARY OF DAY DATA.

VALUES PRESENTED BY INDIVIDUAL MONTH AND YEAR WITH ALL YEARS COMBINED.

SPEEDS PRESENTED IN KNOTS.

CDIRECTIONS PRESENTED IN 16 COMPASS POINTS FROM BEGINNING OF PERIOD OF RECORD THROUGH JUNE 1968.COMMENCING JULY 1968 DIRECTIONS PRESENTED IN TENS OF DEGREES.

AN ASTERISK "*" IN THE TABLES INDICATES THAT THE VALUE IS BASED ON AN INCOMPLETE MONTH OF THREE OR MOREMISSING DAYS.MEANS AND STANDARD DEVIATIONS PRESENTED DO NOT INCLUDE INCOMPLETE MONTHS. FOUR OR MORE MONTHS ARE NEEDED TO

COMPUTE THESE STATISTICS AND INCOMPLETE MONTHS ARE NOT INCLUDED.

STABLES ALSO INCLUCE THE OBSERVATION COUNTS.

BIVARIATE PERCENTAGE FREQUENCY TABULATIONS OF SURFACE WINDS

DATA DERIVED FROM HOURLY DATA.

PRESENTED ARE THE PERCENTAGE FREQUENCY OF WIND DIRECTION TO 16 COMPASS POINTS, CALM AND VARIABLEVERSUS WINC SPEED IN KNOTS IN INCREMENTS OF BEAUFbRT CLASSIFICATIONS.

PERCENTAGES ARE SHOWN BY BOTH DIRECTIONS AND SPEED, AND IN ADDITION THE MEAN WIND SPEED IN GIVENFOR EACH DIRECTION.

DATA PRESENTED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH, MONTHLY AND ANNUALLY IALL YEARS COMBINEDI..

o A SEPARATE ANNUAL TABLE PRESENTS THE SAME BIVARIATE DISTRIBUTIONS WITH IMPOSED CEILING/VISIBILITYLIMITATIONS: WHEN VISIBILITIS EQUAL TO OR GREATER THAN 1/2 MILES, THE CEILINGS ARE 200 TO 100 FELT AND/OR WHENTHE CEILING IS EQUAL TO OR GREATER THAN 200 FEET, THE VISIBILITIES ARE 112 THROUGH 2 1/2 MILES.AA PERCENTAGE VALUE Of ".0" IN THESE TABLES INDICATES ONE OR MORE OCCURRENCES AMOUNTING TO LESS THANk *O3St

*-2 t.

J ' ' -

,

GLOBAL CLIMATOLOGY BRANCH EXTREME VALULS OF SURFACE WINDSUSAFETAC IFROM DAILY OBSERVATIONS)


STATION NUMBER: 03S623 STATION NAME: RAF ALCONBLRY UNITED KINGDOM PERIOD OF RECORD: S9-8 7

.. .... .... .... ..... .... .... .... ..... .... .... ......................................... ..DAILY PEAK GUSTS IN KNOTS

I .M--N-T-H-S- A LLVEAR I JAMNI rEBI MARI APRI MAVI JUNJ JULl AUGI SEPI OCTI NOVI DEC MONTHS

S9 I I I 30 60 u 391 SN 411 WNW 451 A 451 NE 301 SN 381 WSW 331 w 311 NNW 341 NW z91 SW 401 A 499 W 49

61 1 SN 4c; 481 WSW 311 ASW*311 W *341 WSM 281 WN 331 SSW*421 SN *361 NNW-431 SW

*391 SW 491 Sw 49

62 1 WSW 601 ENE 521 Sw 321 SSW 461 NW 371 SN *321 Sy 301 N *391 S *331 W *28 N 391 WNW.569 isA 60

' 63 1 ENE*411 ESE*261 WS*381 SSE 341 SSw*31I .NW 321 SSW 271 NSN*371 SW *341 SN *261 WSW 461 SM 21 WSW 46

64 I NMA 271 W 231 WNW 321 NNE 311 WSW 391 ENE 261 WSW 291 SSW 299 ASW 351 SN 329 N 351 WNW 401 ANW 4065 WSA 461 W 31 SW 291 WNW 379 w 371 WSW 411 NSA 301 ANW 301 S 411 SW 361 WSW 451 ANN 519 ANN S1b6 I 361 SW 411 N sal N 341 WSA 421 WNW 331 SN 341 SA 381 WSW 371 SE 30| WNW 441 SSW 421 N So67 1 NSW 321 SW 511 WNW 371 NNU 351 SM 361 SN 321 WSW 371 A 271 SW 431 A 431 ANA 341 N 291 SA 5168 I WSW 391 ESE 291 NNW 441 SW 361 NSW 331 SW 359 18/ 511 29/ 311 23/ 391 231 291 34/ 349 2S/ 369 18/ 1

C 69 1 14/ 331 2S/ 361 251 331 27/ 441 29/ 301 36/ 281 2Q/ 301 36/ 321 251 321 32/ 301 25/ 371 I/ 319 271 44TO 1 30/ 279 29/ 461 30/ 3S1 34/ 331 30/ 331 30/ 359 29/ 369 251 401 24/ 409 31/ 451 26/ 5 -1 3'/ 391 761 St71 1 211 321 31/ 4CI 291 301 111 301 14/ 271 30/ 321 27/ 291 25/ 311 27/ 299 201 351 33r 439 24/ 359 31/ 4072 1 33,0 4149 17/ 371 28/ 401 29* 321 251 421 21/ 331 32* 231 9 1 35* 271 30/ 481 211 41973 1 24/ 271 29/ 371 33/ 369 28/ 481 301 369 35/ 271 20/ 249 26/ 361 331 331 28/ 381 29/ 361 32/ 421 261 4874 9 27/ 569 201 441 29/ 351 6/ 269 21 269 27/ 381 3,t/ 391 291 301 231 481 291 401 291 421 27/ 461 17/ 56

( 75 1 24/ 551 29/ 3J1 20/ 331 29/ 401l 3/ 361 32/ 331 23/ 289 30/ 281 24/ 469 30/ 381 34/ 431 32/ 4r! 241 5576 1 28/ 659 36/ 409 26/ 329 32/ 331 29/ 359 30/ 319 ZO/ 259 32/ 269 10/ S09 25/ 391 19/ 389 16/ 319 781 6577 1 25/ 411 20/ 379 301/ 41 30/ 471 6/ 331 33/ 349 20/ 299 231 311 21/ 349 27/ 401 30/ 549 24/ 45 3t/ 54

78 1 3b 51 261 309 281 iS9 34/ 311 32/ 301 2/ 261 21 269 22/ 249 291 37! 251 271 21/' 409 7/ 35 36/ S179 21/ 429 3/ 381 231 391 22/ 391 21* 351 34* 319 32/ 269 221 431 281 311 10/ 279 231 341 2S/ 4S 25/ 48.; 16/ 411 221 299 23/ 409 33/ 331 41 259 18I/ ;30 331 329 32/ 301 241 371 4/ 381 26' 409 3r. 439 Ilc 43

(' 81 29/ 471 21* 389 21* 389 2* 429 20/ 341 21/ al 29/ 289 2* 281 22/ 341 22/ 3SI 29* 411 Z* 359 29/ 4782 1 1 369 201 379 281 4S 2S/ 331 31/ 369 30/ 79 2* 279 211 349 36* 239 I 180 351 27/ 54983 9 27/ 471 26* 489 28/ 469 36/ 381 29/ 281 29/ 251 32/ 23 31/ 231 25/ 431 20/ 411 28* 339 1/ 439 ,6* 4884 34/ 53I 30/ 649 311 55l I I 27*189 351 25 27/ 269 1/ 389 25/ 399 21/ 359 34* 39985 1 241 421 9/ 3C9 26/ 291 281 341 221 269 32/ 371 21 369 17/ SSI 30/ 321 21/ 399 Z1 431 41 391 1/ 4386 1 31/ 521 41 389 25* 409 4/ 381 21/ 321 25/ 1311 35/ 301 271 391 35/ 361 221 40 221 371 281 471 3I/ 52

S87 1 b 1 391 211 329 23/ 589 28/ 419 361 419 .21 :329 91 321 29/ 261 Z2/ 311 1 I 9..... :" .... .... ... ... ... ... ....... ;;';:[";;';:i";;';:i"; ';:i' ;';;......: ...

r) S.O. 1 13.2031 8.8449 7.9969 5.8381 5.0381 4.C75 S.7851 4.9771 5.05!1 S.5221 5.5491 6.*331 6.302TOTAL ObS 9 8491 7729 8459 8081 8489 8319 8599 8471 7961 7981 7881 8391 9880.............................................................................................. ...................................................

NOTES * IRASEU ON LESS TPAN FULL -ONISIs (OASEO ON LESS 7THAN FULL MONTHS AND -100 KNOJ)

2.L.

GLOBAL CLIMATOLOG T BRANCH PERCENTAGE FREIOIENCr OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEED

USAfCTAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: CI5623 STATION NAME; RAF ALCONBURV UNITED KINGDOM PErPIO OF' RECOO: 79,82-87MONTH: JAN I-OUOSILSTI: On3Q§-Oe0M

I WIND SPEED IN KNOTSDIRECTOM I 1-3 9-6 7-10 1I.16 17-21 22-27 29-33 3-90 41-497 8-s GE S6 ICTAL MEANtOEGREESI I WIND

N 1.9 4.1 9.5 .2 10.7 6.1

NNE I . .2 1.0 1.9 1• S B.1

NE I .2 2.6 1. 2.9 6. 7 6.7

ENE .7 1.0 .S 2.1 6.2

E I 1.0 1.0 .5 2.9 7.0

ESE I S .2 .2 1.0 6.5

SL I S .2 .S 1.2 2.4 9.5

SSE 1.0 .7 1.2 .2 3.1 10.0

S 1.0 1.9 1.9 1.0 *2 S.5 6.9

SSW 1.0 2.6 2.1 .7 .S 6.9 7.5

SM 1.0 3.1 3.6 1.9 1.0 10.5 9.2

NSW 1. 1.2 3.3 3.6 9.5 9.6

I 1.0 1.9 3.6 S.3 .7 .2 12.4 10.8

NW 1. 1.7 1.9 1.7 .7 1.0 8.1 10.7

NV .7 1.9 1.0 2.1 5.3 a.5

NNU .2 .7 1.2 1.2 3.3 9.2

VARIABLE I.7 .2 .2 1.2 16 .9

CAL" ///I II/I if/ 111111,4 1111/1/11// //1 /// / /// /////// // 3,8 //////l

TOTALS I 13.6 24.1 27.2 2S.6 .1 1.9 100.0 8.5J I

TOTAL NUMBER Or OBSERVATIONS: 919

-Ii

I--~~r - - - - w

GLOBAL CLINATOLOBT BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND D7RECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MACSTATION NUMBER: 035623 STATION IAME: RAF ALCOlBtRY UNITED KINGDOM PERIOD OF RECORO: 78-87

MONTHS jaN HOURSILSTI: 0300-0500

I wIND SPEED IN KNOTSDIRECTION 1-3 4-6 7-10 11.-16 17..21 22.-27 28:33 34-40 11-47 8-55 6E 56 TOTAL MEANo EOEREES S x I WiNo

N 2.6 3.6 2.11 1.6 .46 10.s 7,2

NNE .8 .5 .3 .7 2.3 6.9

H NE I 1S 1.1 1.3 1.3 .3 4.8 8.7

ENE .1 *T * 1.1 *I 2.2 1n.1

E .5 1.2 1.2 .7 3.6 7.6

ESE I .3 .8 .6 *6 1.9 6.6

SE I 6 .5 .1 .6 .S 2.4 11.2

SSE j.3 1.5 ,S .5 2.8 7.0

C S 1.7 2.0 2.2 .5 5 .1 7.1 7.4

SSW 1.2 2.6 2.2 1.9 .7 ,1 8.5 8.6

SW .9 3.0 3.1 3.5 .3 .3 l.() 9.0

WSW .9 2.6 6.7 2.0 . ..3 10.9 6 .9

..7 2.7 2.3 3.9 1.1 .3 10.9 10.3

WN W .8 1.2 1.2 1.9 1.1 6.2 10.1

km .9 .7 1.5 1.2 .1 6. 8.S

NNW W .6 .8 1.1 1.9 .3 4. 9.3

............................................................................................................................VARIABLE i .3 .8 .5 1.6 16.3

CAL M Iuuif/ll10 I Ijj///I// /jjI /i/ 11 /.// Ii//I i ujj/I/II/,f/ I//j//j I I///, f ~ 4.a wi

TOTALS I 13.7 25.3 26.9 26.7 5.9 1.5 100.0 8.6

........................................................................................................................................

TOTAL NUMBER OF O8SERVATIONS: 766

J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEOUSAFETAC FI0'q HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURT UNITED KINGDOM PERIOD OF RECORD: 78-8?MONTH: JAN HOURSELSil: 0600-0600

WIND SPEED IN KNOTSOIRECTION 1 1-3 46 7-jO 1t-16 17"21 22-2? 28,.33 34-40 4 1!74 7 19 9-55 GE 56 TCTAL PEANIDEGREES) I WIND

N 2.1 9.9 1.2 1.0 .2 .1 9.0 6.3

NHE .1 1.2 .9 2.2 5.8

NE I . ,6 .6 .5 .6 2.7 9.9

ENE .2 .2 1.3 .2 2.1 12.1CE .5 1.6 .2 1.3 3.7 7.8

0 ESE ,6 .6 .2 .9 2.3 7.8

SE o. .6 .9 .9 2.C 12.5

SSE .2 .7 1.1 *6 2.7 8.5

S .7 2.9 2.9 .5 .9 6.S 7.0

SSW .5 2.7 2.9 1.1 .6 .1 .1 8.0 8.9

SW 1.5 9.9 3.9 3.2 .9 1.3.1 8.9

uSW i 1.1 2.8 4.1 3.9 .2 .4 12.1 9.1

M 1.0 1.0 2.3 9.3 1.5 .1 10.1 11.3

WNW .5 1.0 1.1 2.0 .1 9.6 9.6

M 1.O .9 2.1 1.A 5.7 a .8

NNW .9 1.1 2.1 1.8 .7 .1 6.7 10.0

... .. ... .. ... .. ...'. ....... ... . . . . . . . . . . . . . . . . . . ............ ........ . .... .. . ...... '". .5 1 .

VARIABLE .2 .6 .9 .2 1.5 IS.?

CALM |j.j //jI//// llIll////j/j/jI//j/////ij///j/j//////j//jj/ j/I//jj/j///IjI/U//////i/ 119.9 II/IlI

TOTALS I I1.3 26.0 25.2 25.1 5.9 1.S *1 100.-E 8.5

.................................................................................... ............................................................

TOTAL NUMBER OF OBSERVATIONS: 820

-o

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLy OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURV UNITED KINGDOM PERIOD OF RECORD: 76-67MONTH: JAN HOURSELSTI: 0901-1100

I WIND SPEED IN KNOTSDIRECTION 1 1-3 4-6 7-10 11-16 17-21 22.27 28:33 34-40 -1:47 9.-5S GE 56 T07AL MEANIDEGREESS I WINO

S....................................................................t..............................................................N 2.0 4.3 2.8 1.3 *2 10.6 6.6

NNE .S .7 .9 .5 2.6 7.0

o NE *2 .6 .5 .3 .1 1.7 7.9

ENE I .6 .2 .7 .B .2 2.6 9.3

E t eC .9 .8 .7 3.S 6.6

ESE [$ 3 1.2 .)8 .2P 2. 6.b5

SE 01 E3 .6 .9 .1 2.1 6o.6

SSE .,6 *6 .8 1.0 3.0 8 ,4

S 1.0 2.2 2,0 1.0 6.3 6.7

SSW .6 2.0 2.9 1.9 .5 .5 B.3 9.7

SM .7 2.8 3.3 3.7 .2 10.7 9.0

oSW .*6 2.6 9.9 .1 .8 .2 13.2 9.9

W .8 .8 3.0 4.z 1.o .7 10.6 11.9

WNM 1.2 1.0 1.7 1.0 .2 .1 5. 12.5

.3NM IS 1.6 1.9 .7 *i 11.3

NNMW .9 1.0 2.2 2.0 .5 .2 6.9 9.7

~~~~.. . ...............................................................

VAIABLE .*2 .9 .7 .3 Z.

16.3rICAL" I///,/i / iJ//ii/, IIi/I //i//Ii/iUI 2.9 /l//li

TOTALS | 10.4 Z.9 29.1 27.2 6.1 2.3 .1 100.0 9.1

.............................................................................................................................................

TOTAL NLMBER OF OBSERVATIONS: 859

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRON HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 71-87MONTH-: JAN HOURS(LSTI: 120L-1400

I WIN( SPEED IN KNOTSDIRECTION I 1-3 %-6 7-10 hI.

1 6 17:21 22.27 28-33 34-40 81.-17 88-5,5 GE 56 TOTAL MEAN

O OEGOEES1 t WIND............................................................... 0.......................................

N 1.2 3.8 3.2 2.5 .8 *1 11.3 8.3oNNE I . 1.3 1.4 .6 3.9 7.3

o NE .2 .5 .5 .2 *1 *1 1.8 8.9

ENE .3 1.2 *2 1.1 .1 3.0 83

E .4 .S 1.0 1.0 .1 3.1 8.8

o (SE .3 .3 1.2 1.9 6.6

SE I .1 .3 1.2 .3 .1 2.1 8.8

SSE .6 1.3 . 1.0 .4 .1 8.4 8.5

o S. 1.1 1.5 2.5 1.2 .1 6.5 7.6

SSN .5 2.0 1.5 1.2 .4 .1 5.8 9.0S.¥ .5 1.8 2.3 3.6 .6 8.7 10.8

. WSW .9 2.2 3.7 3.5 1.8 .1 11.8 10.8

N .2 2.2 3.7 5.6 1.1 .7 .8 14.1 12.5

wN .1 1.0 1.1 2.2 1.8 1.1 7.2 18.3

NW .1 .3 .9 1.6 .7 .2 3.9 12.7

NNW .3 1.8 1.3 1. .7 .2 5.' C.S

................................................. ........... ............................VARIABLE 1.3 .6 2.6 17.3

CAL" I If / i/Iii t/i /I/ / Ji/I/I////////////i//// / I f/j/t1//// 2.3 illlll

) TOTALS ?.7 21.5 26.6 29.2 9.0 3.3 *8 100.0 10.1

.........................................................................................................................................

TOTAL NUMBER OF OBSERVATIONSs 912

.me

GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FRON HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JAN HOURSILST3 1503-1730

..................... ................................................................ ..............................I WIND SpEED IN KNOTS

OIRECTON | 1-3 4-6 7-1D 11-16 17-21 22-2 28733 34-40 41-47 48-55 GE 5b TOTAL MEANIDEGREES I W MIND

N 1.2 3.7 2.5 2.4 .5 * .1 10.4 9.2

NN E .8 2.0 1.0 1.0 4. 7 6.7

NE .2 1.3 .5 .2 .2 2.5 7.0

ENE .2 . ..5 1.0 2.5 a.8

E I 4 .8 .9 .7 .2 3.C 8.5

ESE I 2 .5 *a .2 1. 7. 3

SE I 1 1.0 1.0 .2 2. 3 7.1

SSE .4 .5 1.0 1.1 3.t V.4

S .9 1.4 1.7 2.3 .3 6.7 9.0

SSW 1.4 2.0 2.0 1.4 6.8 7.0

SM .8 2.7 4.0 3.0 .9 11.4 9.2

WISW'

.9 2.4 4.3 1.9 1.3 10.7 9.5

W .3 2.6 4.5 4.3 1.3 .s 13.6 10.8

WNW .1 1.2 .7 1.9 .5 .4 5. 11.8

NW .5 1.0 1.S .9 .3 .1 .1 4.5 9.8

NNW S 1.4 1.3 1.4 .5 .1 5.4 9.3

..............................................................................................................................................VARIABLE .1 .0 .3 . 1.5 16.3

CAL" Ifj1/iI////I/I///If// d//II/1/ /I11//I/ /////111/I1///I///////i /// 3.5 Ii,111

TOTALS I 9.3 25.41 28.3 24.7 6.6 1.5 .1 .2 100.0 8.9

.....................................................................................................................................

TOIL NuMBER O O BSERVATIONS: 915

GLOAAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEUUSAFETAC FROM HOURLY OBSERVATIONS


STATION NUMPER: 035623 STATION NAME: RAF ALCOBURT UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JAN HOURS(LSTI: I800-2O

I WIND SPEED IN KNOTSDIRLCTION 1 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-4O 41-47 48-55 GE 56 TOTAL MEANIDEGR-ES I I WIND

N 2.5 3.6 18 1.6 .5 .3 .1 10.4 7*9

NNE .4 1.8 1.0 .9 4.2 7.2

NE .3 .9 .4 1.2 .1 2.9 9.1

ENE .4 .4 1.0 .7 2.5 8.5

E. .7 .8 .7 .7 . .,1 3. 8.

ESE .3 1.0 .7 .1 .4 2.5 8.1

SE .4 1 .C .5 1 2. 1 6.0

SSE .4 1.3 .7 1.2 3.5 8.0

s .9 1.7 2.0 1.4 .1 6. 1 7.8

15 .4 2.9 1.6 2.3 .4 8.6 71.8

SW .9 4.4 3.1 3.0 .7 .3 12. 4 8.9

WSW .7 3.1 4.2 2.5 .1 10.5 V.3

W .8 2.3 3.5 3.9 .A .4 11. 7 10.3

NW 1. 3 .5 1.3 1.2 .9 .4 5. 6 10.6

h .5 1.3 1.2 .3 .1 3.4 6.9

NNW .5 1.3 2.0 1.9 .3 5.6 9.1

VARIABLE I ,8 .1 .1 1.- 15.8

CALM . 1////I//////i//i,I/////i////I/,//Ii/,i////i// ///////////////////I 4.2 I/I/I

TOTALS I 12.2 28.2 25.5 23.5 4.7 1.3 .3 .1 10.' 8.3


0e

. GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLT OBSERVATIONSAIR WEAlT4ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO-BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTi.: JAN HOURSILSTI: 21O3323jO

...................................... ..........................................................................................................I WIND SPEED IN KNOTS

DIRECTION 1 1-3 4-6 7-10 11-.16 17-21 22-27 28-33 34-40 41-87 48-5S GE 56 7OTAL MEANIoEGRIESI I WIND

..........................................................................................................................N 1.2 3.2 2.5 1.1 .1 .3 8.4 7.7* C'

* NNE . 2.0 .9 .9 .1 8.8 7.4

hE I .1 .7 .3 1.1 2.1 8.8

ENE .1 .7 .8 1.3 *8 3.3 10.7

E 1.3 1.1 .5 .3 1.? 5.3

ESE .3 .7 .5 ,8 .1 2.(' 8.2

SE .4 .9 .1 1.6 7.8

SSE .8 1.2 1.2 .9 4. 1 7.5

S.I .5 1.7 1.6 .7 .3 4.M 7.6

SSW 2.1 2.7 3.1 2.0 .8 I3. 7 8.2

SW .5 2.1 8.6 2.5 1.2 .8 11.8 10.3

WSW 1.2 3.1 8.1 2.1 .3 .1 11.1 8.1

V .5 2.3 2.9 S.1 .5 .4 11.8 1r.7

.NW ,7 1.1 1.3 1.5 .3 .3 .1 S., I.3

NW .3 1.6 1.5 .3 .1 3. 7 8.0

NN .3 1.1 2.4 .9 .S 5.? 9.6

.......................................................................................... ............................................. ............VARIABLE 1 1 1 17.0

CALM 6.4 //1j//./'//I,////j j////////// // /I/ii/////j/////I/// i// ///// 6.8 /I/III

1TOTALS I 10.6 25.6 29.5 21.4 8.6 1.6 ,q. 100. ? 8.2................................................................................TOTAL NUMBEP OF OSERVATIONS: 747

1i

*GLOBAL CLIMATOLOGYt BRANCH PERCENTAGE FREQUIENCY Or OCCURRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM H'OURLY OBSERVATIONSAIR WEAT14ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALC04BURY UNITED KINGDOM PERIOD OF RECORD: 18-87MONTH: JAN HOURS(LSTI: ALL

I WIND SPEED IN KNOTSDIRECTION 1 1-3 4-6 7-10 11-16 17-21 22-?7 28-33 34-4D NI-Ni 48-55 GE 56 TCTAL MEAN

2 I

IDG|-S I I

NNdE -.5 1.3 .9 *8 .0 3.6 7.1

NE .3 .9 .6 .A .2 . 2.9 V.6

ENE ( .3 .6 S5 1.0 *1 2.6 9.N

L I .7 1.0 .8 .7 .1 .0 3.2 7.5

ESE I .3 .7 .6 .3 .1 2.-1 7.3

SE . . 2 .6 .6 .5 . .0 2. 1 9.2

SSE I .5 1.0 .9 .9 .1 .1 3. V.2

SR 1.0 1.9 2.0 1.1 .2 .0 6.2 7.6

SSW 1.1 2.4 2.3 1.6 .5 .1 .0 7.9 8.4

SM I .8 3.0 3.4 3.1 .7 .1 11.2 9 .3

WS .9 2.6 4.2 2.9 .6 .1 11.4 9.3

.6 1.9 3.3 4.6 1.0 .4 .1 11.9 11.1

WNW .6 1.1 1.1 1.8 .8 .4 .0 5.8 11.5

NW .5 .9 1.4 1.2 *3 .1 .0 N.4 9.5

NNM .6 1.1 1.7 1.6 .S .1 S.6 9.6

............................................................ ................................................................................VAB 2 .1 .8 .4 .2 1. 16.2

TOTALS 10.9 24.7 27.1 25.3 6.0 1.9 .2 .0 10" R.

.......................................................................... ....... ........................... ......................................

TOTAL NUMBER OF OBSERVATIONS: 618S

Ii

GLOBAL CLIMATOLOGI BRANCH PERCENTAGE FREoUENCy oF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURL OBSERVATIONSAIR WEATH4ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 78,82-87MONTH: FEB POURSELSTI: 0001-O21O.. .... ..... ..... .... .... ...... . . ....... ... .... .... .... .... ... .... .... .... ..

I MI ND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11:16 17-21 22-27 28-33 34-4D 41-47 48-55 GE 56 TOTAL MEANIDEGREES) I S WIND

...........................................................................................................................N 2.3 6.3 2.5 .8 .3 12.1 5.8

NNL 1.8 2.0 2.5 1.3 7. 5 6.9

NE 1. 8 3.8 3.0 1.3 .5 10.3 7.2

ENE .5 V.5 3.5 1.3 9.q 7.3

E 3.8 3.0 1.3 .8 8. a .9

ESE .8 .8 1.5 3. 3

SE .5 .8 1.3 11.2

SSE .5 2.0 1.3 3.8 9.3

S I.S 3.5 1.5 .8 7.3 5.9

S$W 1.3 .8 2.0 .K .8 5.5 9.1

SM 1.5 2.5 2.5 .8 .S 7.8 7.3

WSW I 1.5 2.0 2.0 .5 6.S 9.1

.,8 .5 1.0 1.0 .3 3.s 8.7

WNW .8 .3 .3 1.1 11.6

NW .3 .5 .8 1.5 11.O, NNW .3 2.0 .3 2.5 5.1

...........................................................................................................................................VARIABLE I

CALM 9.1 1/1411/

TOTALS I 16.8 31.7 25. 13.3 3.5 .3 100.0 6.5

....................................................................................................


*-

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURT UNITED KINGDOM PERIOD OF RECORD: 78-8

MONTH: FED HOURSILSII: 030)-S50............................................................ ...................................................... ............

I WI8MD SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11.16 17-21 22-27 28:33 34-40 411-47 48:55 GE 56 TOTAL MEANo IDEGREESp I I WIND.. .. .. .. .. .. .. .. .. .. .. .. .. .. .... • .. . ...... ..... .. .. ............ ...... ..... . . . . . . . . . .. . . . . . .

N 2.3 3.4 2.1 1.0 .6 9.4 6.7

NNE 1.2 1.8 1.9 2.2 .3 7.3 e.2

.E N 1.0 2.3 3.5 1.5 .9 9.2 8.4

ENE I 1.2 3.2 2.6 1.6 8. 7 7.0

E 1.6 3.2 2.5 .6 T.9 S.9

C) (SE . 1.3 1.8 .3 3. 4.2

SE .1 .7 .9 1.0 2. e.2

SSE .6 .4 1.2 .6 2.8 7.7

S 1.2 2.3 2.6 1.2 7.3 7.1

SSW .9 2.8 2.3 1.2 .3 7.5 7.5

SW 1.5 1.9 1.5 .6 .7 6.2 7.8

WSW .3 1.0 1.6 .7 .6 4.3 9.7

W .6 1.0 3.4 1.3 .1 6.5 8.8

WNW .3 1.2 .7 .4 .1 .1 2.9 9.1

NW .3 .1 1.2 1.0 .1 2.4 10.9

NNW .6 1.3 1.6 ,! 3.7 6.3

............. .......................................................................................VARIABLEI

TOTALS I 15.0 28.6 29.9 15.0 3.7 .1 .1 .1 100.0 7.0

.......................................................................................................................................

TOTA NUMBER OF OBSERVATIONS: 682

TOTAL2.I

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEEDUSAFETAC FRO4 HOURLY OBSERVATIONSAIR IEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 7M-87MONTH: FER HOURSILSTI: 06G*-Ob O............... ~... . . ... . . ..... .... ...... ........ ... ... ...................

I WINO SPEED IN KNOTSDIRECTION 1 1-3 4-6 7-10 11-16 17-21 22-27 28-33 3%-40 "1-47 48-55 GE 56 TOTAL MEANGOE6R-ESI I I WIND

.....................................................................................................................N 2.2 3.7 3.0 1.2 .3 10.4 6.6

NNE 1.7 2.5 1.8 1.8 .3 8.2 7.4

NE 1.3 2.2 2.2 1.1 .4 .4 7.6 8.2

ENE .7 2.2 3.4 1.8 8.2 8.0

E 2.1 3.0 2.1 .8 8.0 S.8

C ESE .7 .8 1.7 .1 3. 3 7.2

SE .1 1.4 1.4 .4 3.4 7.3

SSE .7 1 . 1 1.6 .5 3. 8 7.0

S 1.3 2.5 2.6 1.8 .4 8.7 7.8

SS f .9 1.4 Z.0 1.4 .1 S.3 8.0

SW 1,3 1.1 2.C 1.1 .3 S .7 7.9

WSW l.o 1.6 2.08 .8 .3 6.8 7.1

W .9 1.2 2.1 1.0 .1 6. Z 8.8

-N W .7 1.2 1.1 .S .3 .1 .1 3.9 6.9

NW _ S .4 .4 .1 1.4 10.7

NNW ,S .5 1.2 .7 7. 7.5

CALM I///////I////j///////8//////j/j/jii/j/Jj////il 5.4 //11/1

TOTALS I 16.6 27.0 31.6 16.2 2.2 .9 .3 100.3 7.1

......................................................................................................................


-u-i-4

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATI 4ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURV UNITED KINGOMN PERIOD OF RECORD: 18-87MONTH: FEB HOURS(LSTI: 0900-ILCO

..................................................................................................................................................................WIND SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-1D 11-16 1-21 22-27 2SM33 34-90 41-47 48-55 GE 56 TCTAL MEANIDEGREESI I W MIND

.......................................... .................................................................................................NI. 2.6 3.9 1.6 .5 1 5, 8.2

NNE 1. 2.9 2.0 .9 .1 7.3 6.7

NE .4 1.5 2.0 1.5 .3 .5 6.2 9.9

EWE .5 1.8 3.9 2.8 .1 9.1 8.9

L I 1. 3.0 2.5 2.6 .1 9. 7 7.9

ESE .8 .9 1.9 .8 .3 .1 9.2 8.4

SE .5 1.? 1.8 .5 3.9 7.1

SSE I .4 .4 1.9 1.4 4.0 9.2

S .5 1.9 3.5 1.9 .5 7.8 9.0

SSW •1. 1.8 2.3 2.3 .3 8.1 7.9

SW 1.3 2.0 1.3 .3 4.9 9.4

WSW .3 1.9 1.9 1.1 .3 .3 5.7 9.4

V .9 1.3 1.6 2.8 .1 .3 6.9 10.2

WNW .3 .6 .8 I.s .1 .1 3.5 10.3

Nw .1 .3 .9 .3 .1 1.6 9.8

NNW .4 .9 1.3 1.0 .1 .1 3.8 8 .9

VRagIABLE I 1,1 10.0

TOTALS 10.2 23.7 33.8 29.2 3.0 1.5 100.C 8.,

tOTAL NUMBEB OF OBSERVATIONS: 793

.4.

2

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SFEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-A7MONTH: FEB HOURSILSTI: 1209-1430

................................................................................................................ .......

DIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-410 NI-N? 48-55 GE 56 TOTAL MEAN(DEGREESI % WIND

.............................................................................................................................N .7 1.1 4.5 2.1 *6 .2 9.5 9.9

NNE .2 1.4 1.3 1.3 .2 4.5 8.5

NE .6 1.6 2.3 1.9 .1 . 7.2 10.0

ENE I .2 1.8 3.2 3.6 .2 9. 1 9.8

E .7 2.1 3.2 2.7 .S 9. 3 8.9

ESE .4 * 1.1 1.N 1.2 .N 4 .4 9.5

SE .5 1.N 1.2 2.0 O1 "1 S4 9.3

SSE ".6 1.3 2.3 1.9 .2 6. 1 8.9

S .6 .7 3.0 2.5 .4 7.2 9.7

SSW .7 1.9 1.3 2.0 .N .1 6.4 9.2

SM .2 1.3 1.7 2.3 .6 6.1 10.3

WSW .6 1.2 1.7 1.2 .4 5.1 8.

W .2 .8 1.4 1.8 1.0 .1 .2 5.6 12.6

WNW ,2 .6 1.0 1.1 1.0 .4 4.2 12.5

NA I *N el 1.7 .8 . .2 3.6 10.8

NNW .4 .2 1.9 .V1 .2 3.1 9.7

.................................................................................................................................................VARIABLE .7 .4 .1 1.2 11.0

CALM | // /i // II Ii i 1.9 I//I/I

TOTALS I 7.3 18.7 33.8 29.5 6.4 2.1 .2 10O.3 9.7

..................................................................................................................................................


*A

* GLOBAL CLIMATOLOGT BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEoUSAFETAC FROO HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PECIOD OF RECORD: 78-87

MONTH: FEB I4OURSILSII: 1501-1710

............................................ ................ ..................................................................................WINO SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11m16 17-21 22-27 28-33 34-40 1-47 48-55 GE 56 ICTAL MEANIDEGREES) I S WIND

N1* 1.1 3.3 2.7 .2 8. 9.2

NNE .8 1.3 2.3 1.3 .4 6.1 8.8

E N1 .2 1.3 3.2 1.9 .4 .4 8.9 9.1

ENE .8 1.9 3.8 3.5 .4 I.9 9.2

E 1.9 2.9 3.2 1.7 B. 7 7.4

ESE .8 .8 1.1 1.9 .5 S 1 9 .7

SE .5 1.9 1.1 1.8 ,1 49 9.0

SSE .2 1.0 1.8 1.9 4.9 9.3

S .1, 1.2 3.1 1.8 .4 .2 7. 9 9.0

55W 1.1 1.1 1.6 2.0 .2 6.1 8.8

Sw ,5 1.7 1.0 1.1 .5 4. 7 8.3

WSW 1.0 1.0 1.9 1.7 .2 5. 3 8 .8

W .4 1.6 2.4 2.0 .2 .2 6.9 9.6

WNW .4 1.1 .6 1.9 . 3.9 1C.1

NA .1 .5 1.6 .7 .1 3.3 9.5

NNW .2 .6 1.0 .4 .2 .2 2.6 10.0

VARIABLE I .5 ,T 13.3

CALM 2.7 imll/I I i I///I//ii/I//////I////i//I/I//i/ 2.7 u/i/1

r oYALS I 1.5 19.8 32.91 28.3 3.8 1.9 lot.: P .8

................................................................................................................................................


-4

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM 4OURLY OBSERVATIONSAIR wEAT ER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO9BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: FEB HOURSILSTI: 180-2LO

........................ ............................................................. .. ........... .................WINE) SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 l1.16 17-21 22.-27 28::33 34-40 41-47 #4-75S GE 56 TOTAL MEANLDEGREES) | S WIND

. .............. ....................................................................................................N 1.8 1.6 3.5 1.94 . 9.1 7.6o

NNE 1.6 1.9 2.7 1.1 .1 .1 7.1 7.6

NE 2.1 3.3 2.a 1.6 19 10.2 7.5

ENE 1 2.6 ##.0 2.7 10.9 7.9

E 1.8 2.7 2.8 .9 7. a 6.2

o ESE .9 1.6 06 .7 .3 4.3 7.0

SE .7 .6 .9 2.6 .4 5.1 10.3ICSSE I 1.1 1.6 3.0 .7 4.4 6.4

CS 1.7

1.8 2.1 2.9 .3 8.9 801

SSWK .7 1.0 1.6 1.9 .9 .1 5.2 9.9

SNi 1.1 1.9 1.3 .7 9.5 6.9

WSW I e. 1.0 1' .9 4.P 6.7

W: .4 2.1 2.94 .6 .19 .1 6. 1 8.9

WM .7 .9 1.3 2.9 9.3

C NA . .6 .6 .1 .3 1. q a I

NNW .9 1.0 1.0 .1 .3 3. 3 6.7r

TOTALS I 17. 25.9 29.9 18.9 3.4 .9 IO0.C 7.9


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SEEDUS AETAC FROM HOURLY OBSERVATIONS

AIR WEATHER SERVICEIMAC

STATION NUMBER: O!5623 STATION NAME: RAF ALCORBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: FEB HOURSILSTI: 2100-23CU

................................................................................................................................................I WIND SPEED IN KNOTS

DIRECTION I 1:3 46 7-I0 11-16 17-21 22:Z7 28=33 34-40 41747 4B-S5 GE 56 TOTAL MEANIDEGREES1 l I WINo............. o .............................. .......... o ............................ o .................... e

N 1.9 2.9 2.6 1.2 .6 9.2 7.3

NNE I 1.0 1.8 2.9 .9 .1 6.7 7.3

NE 1.8 3.2 3.1 1.5 . .1 10.4 7.8

(NE .9 3.8 3.2 1.8 9.6 7.1

E 2.6 2.8 1.3 .6 7.3 5.2

ESE .6 .7 1.S .6 3.4 7.2

SE .1 .6 1.3 .4 .4 2.9 10.4SSE 1.

5 1 .8 2 .3 .9 6 .4 6 7

S 1.3 1.5 2.0 2.5 .1 7.5 Bo3

SSW .9 .9 2.0 .9 .9 .3 5.8 10.0

SW .9 2.3 1.6 .9 .1 5.8 7.0

WSW .7 1., 2.8 1.2 6.0 8.0

W .7 1.2 2.0 .9 4.3 7.2

NN .9 1.0 .9 1.0 .1 30' 7.3

Nw .6 .3 .1 o7 .1 1.9 10.1

NNW .7 1.2 1.0 .1 3.1 6.1

.................................................. ............................ ....... ................. ......... ....... ............VARIABLE I .1 *1 9.0

TOTALS I 17.1 27.2 31.0 15.9 3.1 .6 .1 100.3 7.1

...................................................................... ...;o ..........................................................


JO .

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDISAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO14BURY UNITED KINGDCM PERIOD OF RECORD: 74-87MONTH: FEA HOURSILST): ALL

...................................................................................................WINO SPEED IN KNOTS

DIRECTION I 1-3 106 7-10 1J.116 1721 22:27 28-33 34-4O 41-47 88-55 GE 56 TOTAL MEANO OEGREESA I % WIN 0.. . .. ... . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. ............ ..... .......... . .. .. ........ ... .........

N 1.6 2.6 3.3 1.6 .8 .0 9.6 7.80NNE 1.2 1.9 2,1 1.8 .2 .1 6.8 7.7

NE 1.2 2.3 2.7 1.5 .8 . 8.5 8.5

EWE .7 2.6 3.5 2.5 .1 9.4 8.3

E 1.8 2.8 2.5 1.8 .1 8.5 6.8

C ESE .8 1.1 1.1 .7 .2 .3 3.9 7.8

SE .8 1.0 1.2 1.2 .1 . 3.9 8.9

SSE .6 1.0 1.8 1.2 .0 8.6 8.1

c S 1.1 1.7 2.7 1.9 .3 .1 7.q 8.3

SSW 1.0 1.s 1.9 1.6 . .1 6.4 8.6C

SW .8 1.6 1.6 1.1 .8 5.5 8.2

WSW I .9 1.3 2.0 1.2 .3 .2 5.5 8.9

W .5 1.2 2.1 1.6 .3 .1 .0 5.9 9.5

WNW I *8 .9 .8 1.0 .3 .1 .0 3.S 9.8

NW .2 .3 .9 .6 .2 .1 .0 .0 2.3 10.3

NN .5 .9 1.2 .8 .1 .1 3.1 7.8

....................................................................... ....................................................VARIABLE *2 .1 .0 .T 11.8

CALM I/iiI/j,,,i,,j jj/j4ji~/iiiii~~//iI//~IIii//~ .6 1111il

TOTALS 13.6 28.6 31.8 21.0 3.7 1. .1 .0 100.0 7.9


Jo L.31

GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREGUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM IOL'RLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-80,82-q7MONTH: MAR HOURS(LSTI: 0Oo0-02,0O

...........................................................................................................................MIDSPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11-16 17-21 22-7 28:33 34-4D 41-47 48-55 GE 56 TOTAL MEAN

IOEGRfEES) I WIND

N38 2.7 2.2 .7 *2 9.6 5.6

NNE 1. 1 3.3 1.1 .2 5.8 S.3

NE .2 .9 2.7 .2 4.3 7.3

ENE .4 .7 1.6 .2 2.9 6.S

E .2 .2 .4 .9 5.8

ESE .2 .9 1.1 .9 3.1 8.4

SE .9 1.3 .7 .2 3.1 6.0

SSE( 1.1 1.6 ,9 .4 .2 4. 6 .4

I 2.0 2.9 1.6 1.1 .7 9.3 7.3

SSW 3.6 1.3 2,0 .'4 .2 .2 7.8 6.0

SM 2.7 5.1 4.2 1.3 .7 14. 1 7.0

WSM 2.5 2.5 2.7 1.8 .2 .4 10.0 7.8

W 2.0 3.8 3.6 .7 .2 Ia. - 6.7

WNW .2 .9 2.5 .41 4.1 7.6

NM .4 1.6 1.6 .2 3.9 6.2

NNW I 1.1 1.3 .7 .4 .2 3 8 8.5

................................................................................................................................................VARIABLE .2 .2 .2 .7 13.7

CALM I/j////////.'/j/I/ji//i/i/II/ii/i//H//I/i////IiI/i//iiiI/I/////ii///Ii//////I/IiiI/I/i/i/ 3.1 IIIIII

TOTALS I 22.5 31.0 29.7 9.2 1.3 2.5 .2 200.1 6.6

TOTAL NUMBER Or OBSERVATIONS: 448

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECIION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC


MONTH: MAR HOURSILSTI: G3W-0560

.................................................................................................................................................I WIND SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11,16 17-21 22-27 28-33 39-40 41-47 48-55 GE 56 TCIAL MEAN

(DE GREE S, W MIND

.............................................................................................................................................

N 1.8 2.2 1.1 1.4 .5 7.C 7.6

NNE .8 2.9 1.7 .8 .3 .1 6.0 7.8

NE .5 .8 1.9 .5 3.2 7.6

ENE .5 .6 .3 1.4 6.7

E .1 .1 1.3 .4 1.Q

8.3

- ESE .3 .1 *8 .8 1.9 9.7

SE .1 .3 1.1 .5 2.7 8.7

SSE 1.3 1.8 1.3 .4 4.7 5.5

S 2.1 3.2 2.3 1.7 .3 .9 17.2 7.6

SSW 2.2 3.7 1.9 1.5 *4 .1 9.9 6.9

Sm 2.8 5.6 3.8 2.3 . 1. 1 7.1

MSW 1 48 . C 9.5 2.8 .5 .4 13. 9 8.5

M o 2.t 3.4 1.7 .6 .6 V.7

WNW .6 1.5 1.5 1.1 .3 5. 1 8.4

NW .3 1.9 .9 .1 .3 2.9 7.3

NNM 1.3 1.0 .9 .8 .5 .1 4.6 6.3

............................................................................................................................................VARIBEI

CALM I ////jj II I /I iiiI,/, /I//ltI I/,I I iiiI// IIJ/j// I iIIII II/ //I I I I /jI 1.7 milljj

TOTALS I 17.5 30.1 28.6 17.0 4.1 1.1 100.1 7.6

............................................ ..............................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD Or RECORD: 78-87

MONTH: MAR HOLRSILSTI: O60-ObOO

I WIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-4O 41-47 48-55 GE 56 TCTAL MEAN

IDEGREESI I % WIND

N16 3.7 1.5 2.1 . 9. 1 7.9

NNF .2 1 .9 1.2 .6 .4 .1 4. 4 8 S

NE .2 .2 1.9 .9 3.3 9.3

ENE .1 .5 .9 1.5 7.0

E 1 1.2 .1 I. . 0.O

ISE . .4 .5 .7 1.6 9.4

SE .4 8 .7 1.4 3. 3 8 .5

SSE I 1.5 1. 8 1.5 .7 5.5 6.3

S 1.1 2.7 2.0 3.2 .4 9.3 V.8

SSW 2.9 3 .7 1.9 1.8 .2 .6 11.1 7.6

SW I .1 4.1 4.2 3.7 .6 13.7 8.7

WSW .9 2.5 3.8 2.2 .7 .1 10.2 8.9

W .8 2.4 3.7 2.2 *6 .2 9. 9.3

WN .7 .7 2.4 .8 .4 .2 5.2 9.6

Nw .5 1.6 1.5 .9 4.6 7.4

NNw ,I .2 2.1 .6 .5 .2 3. 11.2

......... ...............................................................................................................

TOTALS I 12.4 26.7 31.0 22.4 3.8 1.9 1O. 8.


*.mm mm lmr m llma


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTF: MAR POURSILSTI: 0900-1100

.. . . . . . . . . . . . . . . . . . .... ............ .... ...... . .......... ... IIN Sp r N , O S. . ... . .......... ..... . . . . . . . . . .

I WOND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11."16 17-21 22-27 28-33 34-40 41-47 48-55 GE 56 TCTAL MEANIOEGREES) I x WIND

......................................................... ....... ....... .... .......... .... ............ .................. .........N .7 .8 2.9 2.4 1.6 8.3 11.1NNE .2 .7 1.5 1.1 .8 4.3 10.7

NE .6 .6 1.7 1.6 4.4 9.2

ENE •.1 .4 1.1 *8 2.5 9.0

E .4 .2 1.1 1.6 3.4 9.6

ESE ,,1 .3 .2 .7 1.' 9. 3

SE .6 .6 .2 1.1 2.5 8.6

SSE .2 .7 1.9 1.2 1 2.2 9.2

S .7 1.7 4.0 3.0 o2 9.7 9.3SS W 1.2 1.2 3.7 1.9 .7 .2 .2 9.2 9.8

SB .3 2.0 2.7 4.6 .8 .2 10.7 10.9

WSW 1.7 2.6 3.0 .8 4., 10.8

W ,3 1.2 3.8 4.3 1.9 1.3 12.6 12.6

WNW *2 .6 1.9 l.b 1.2 .4 ,1 6.1 12.8

' NB.' .6 .8 1.7 1.0 .2 4.3 13.3

NNB .2 .3 1.6 1.7 .2 .1 44.1 11.0

................................. ......... ...... .................. ........ ...... .. ......... ......................... ... ...VARIABLE 1.0 1.2 .2 *2 .1 2.9 13.8

CALM " I.s 111t11

TOTALS 6.0 13.7 32.8 33.5 9.6 2.s .3 .1 100.1 10.7

....................................................0.-................... .......0.... ..... ...... ...... ..................... ......... .0.........


* •]- rm m n m m m mm m m mlm l m ll m l l • m • il

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUS AFET AC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONT H : MA R OURSILSTI: 120 -1 63 0

................................. ............................ ....... ......I WIN SPEED IN KNOTS

DIRECTION I 1-3 6-6 7-10 11-16 17-21 22-27 28-33 36-40 I-47 68-55 GE 56 TOTAL MEAN2 ID E G R E S I | I IN D

N .2 .6 6.5 2.2 1.1 8.4 10.6

NN. ,2 .3 2.0 1.2 1.1 .2 S.1 11.8

NE .1 .3 1.5 1.2 . 3.5 10.8

ENE I .2 .6 1.0 .8 .3 2.9 9.2

E .8 .5 1.5 1.0 3.q 7.9

ESE .1 *1 .2 .3 .A 12.7

SE .S .2 .5 ,8 2. e.S

SSE .2 .5 1.6 1.7 . 6.5 O.8

S 1.2 1.q 3.0 2.2 .* 7. 7 9.1

SSW .2 1.0 2.6 2.7 .8 .s .1 7.6 12.1

Sw .2 1.9 2.0 5.2 .5 .1 .3 10.3 11.3

WSW - .5 .9 1.9 2.8 1.0 .2 *1 8. 1 12.1

W .2 .9 3.3 6.7 1.8 1.3 11.9 13.0

WNW .9 1.3 2.7 1.2 .9 .1 7. 13.9

NY .2 .5 1.6 1.7 .8 .8 .1 S.5 13.4

NNW .6 .3 1.6 1.7 .2 .1 6.4 10.1

................................. .......................... '. ...............................................................VARIABLE .I8 6. 13.6

TOTALS I 57 10.8 31.8 36.3 11.6 6.2 1.1 100.1 11.5

..................................................................................................................................................

TOTAL NUMBER Of OBSERVATIONS: 930

*

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR MEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78*-87MONTH: MAR HOURSLSTI: 15G3-1700

MIND SPEED IN KNOTSDIRECTION 1-3 4-6 7-10 11.16 17-21 22-27 2833 34-40 41-47 NA-55 GE 56 TOTAL MEAN

SIDEGR"ESl I W MIND

N .7 1 . 3.4 2.0 .2 7.6 8.8

NNE .5 1.2 2.2 1.6 .7 .1 6.3 10.3

NE .5 .S 1.7 2.2 .1 5.1 9.8

ENE .3 .3 1.0 .7 .3 2.6 9.6

E .5 .4 1.4 .5 .1 3.0 8.2

ESE .3 .7 .2 .7 .2 2.1 9.0

SF. .3 .5 .8 *2 .1 .1 2.1 8.4

SSE . . 1.3 1.6 .2 ,1 4.1 10.0

S .5 1.6 1.6 1.S It S. 7 9.0

SSW I S 1.4 2.7 2.3 *9 .5 8.4 10.6

S I .7 2.1 4.2 3.9 1.3. .1 12.3 10.4

W NSW .5 1.1 3.0 3.7 .9 9.2 11.0

.3 1.5 2.5 4.4 1.8 .3 .2 11.2 12.

WNN .3 1.0 1.14 3.9 .7 .9 .1 8.2 12.9

C NU .2 .7 1.8 1.6 .q .3 .1 5.2 11.9

NNW .2 1.1 1.2 .8 .2 3.S a.8

VARIABLE .9 -S .4 *2 2.1 14.5

CALK 1.4 1/1//I

TOTALS 6.9 16.1 31.3 32.1 8.8 2.6 .7 .1 100.0 10.4

......................... ..................................................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEAThER SERVICE)MACaSTATION NUMBER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: MAR HOURSILSTY: 1800-200

WIND SPEED IN KNOTSDIRECTION I 1-3 -6 7-10 11.-6 17:21 22-27 28.-33 31-40 41-47 8-SS GE 56 TOTAL MEAN

o IDEGREE SI I % wIND

N 1.8 1.4 1o6 2.2 .1 7.1 7.60NNE • 3 1.3 2.0 1.3 .5 5.3 9.5

o NE 6 .6 2.8 1.5 56 6.8

ENE .9 .s 1.0 .3 .1 2.8 6.9

E .1 .1 1.1 ,S .1 2.3 9.

ESE I 1 .1 .6 .S 1., 8.9

SE .9 .3 1.3 1.3 *1 3.8 8.6

SSE .* .6 1.0 .9 2.9 8.3

.S 2,8 2.7 2.8 .8 8.6 6.0

SSW 2.0 2.8 2.8 1.8 1.0 .1 9.8 8.1

SW 1.8 3.0 2.7 8.8 .0 1 13.2 9.1

WS WSA 1.1 1.3 3.2 2.8 .3 .1 8.7 9.2

W 1.8 2.9 3.3 2.8 .8 o1 10.5 8.2

WNW .3 1.8 2.5 1.9 .8 .1 7.3 10.1

NW .3 .9 .8 .8 .s .4 3.2 11.3

NNW .8 *s .3 .3 .3 .4 2.4 9.7

.......................................................................................................................................VARIABLE I 01 .1 .3 10.S

CALM S I l/ i/iuuj /////.6 i///ill

TOTALS I IS. ZO.8 29.1 23.2 8.9 1.0 .8 100.0 8.1

......... ... .o .......................................................... ...............................................

OTAL NUMBER OF OeSERVATIONS: 790J

u-I-!

• GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEOUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO0BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: MAR HOURSILSTI: Z10-23C0

....... ................ ...................................................................................................SWIND SPEED IN KNOTS

DIRECTION 1 1-3 4-b 7-10 11-16 17;.21 22-27 28-33 34-0 N1-N7 88-55 GE 56 TOTAL MEANI E S, GR:c[S I | WIND

N 2.5 1.8 1.2 1.8 .5 .1 7.9 7.7

NNE .8 2.7 2#0 .7 .3 6. 1 7 .5

NE I .3 1.8 1.6 *N 3.7 7.3

ENE I .1 .8 .7 .3 1.5 8.0

E . .7 .7 1.8 7.3

EST .. 3I *T 5.0

SE .3 1.6 .5 .1 2.6 9.9

SSE .8 2.0 1.8 .N 4 .Z 6.5

s 2.o 2.9

2.5 1.2 .3 .1 9.0 7 .

SSW 2.6 3.5 3.0 1.2 .5 .1 11. - 7 0

SW 3.0 2.9 3.1 3.3 .5 .7 13. 5 a.b

WSW 1.0 2.5 8.8 1.9 .1 1.7 8.5

W 1 1.8 8.1 3.0 2.7 .3 11.. 7.6

YNW ol 1.6 .0 1.1 oN .3 .1 .N 10.8

NA 1.0 1.2 1.5 .4 .3 8.9 T.

NNW .1 .3 .7 .3 .3 .3 1 2.1 13.5

VTR ABLE I

CALM I //// Im I /I I 1111111111111.4 /1//// 1111/1 //11 /1// 1111 /11/1 //////// I S. 7 I/l/l/

TOTALS I 1S. 28.3 28.1 16.9 3.7 1.6 .3 100.1 7.S

................................................................................... .........................................................


o J_

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRO" fHOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: Ta-87MONTH: MAR HOURSfLSlI: ALL

...................................................................................................................................................I WMIND SPEED TN KNOTS

DIRECTION 1 -3 4-6 7-10 11-16 17-21 22.Z 7 2833 34-40 41-47 48-55 GE Sb TOTAL MEANC GOEGREES) I W MIND

N 1.4 1.6 2.4 1.9 .6 .0 B.C 8.6

NNE .4 1.6 1.7 1.0 .5 .1 5.4 9.2

ME .4 .6 1.9 1.2 .1 4.1 8 .9

ENE .3 .4 1.0 .4 .1 2.3 8.1

E .3 .3 1.1 .6 .0 2. 4 8.5

ESE .2 .3 .4 .5 .1 I., 9.3

SE .4 .5 .9 .8 .0 .0 2.6 8.5

SSE .6 1.1 1.4 1.0 .1 .3 4. 3 a 05 I. 2.2 2.5 1.9 .2 .2 8.5 8.1

SSM 1.7 2.3 2.5 1.B .6 .3 .0 9.1 8.6

SM 1.4 3.2 3.3 3.8 .7 .2 .1 12.7 9.2

WSMW I .9 2.0 3.3 2.7 .7 .1 .0 9.7 9.6

N •8 2.2 3.3 3.1 1.1 01 .0 10.9 10.3

WNW .3 1.1 1.7 1.8 .7 .4 .1 6.1 11.3

NV Mt .3 1.0 1.3 1.0 .4 .2 .1 .0 4.3 10.4

NNM .5 .6 1.2 .8 .3 .2 .0 3.6 10.0

............................................................................ ..................................................................VARIABLE I 0 .1 .6 .6 .2 .1 1 .0 1.7 13.6

CALK I/iIii//iiI/iIi/il//I///I//ii~~ijIi//u/jj,// 2.6 i/l

T OTAL% I 11.8 21.1 30.5 25.0 6.4 2.2 .4 .0 100.0 9.1

I-I


m uIl Jl. llLll.~llIl

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM H4OURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOYBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,65-87MONTH: APR HOURS(LSTI: Ot-0210

.............................................. ..........................................................I WIND SPEED IN KNOTS

DIRECTION | 1-3 4-6 7-10 l,1!;;. 17-21 22-27 28-33 3a4-O 11-47 '8-55 GE 56 TOTAL MEANIDEGREES) I I WIND

......................... ............................................................................................N .8 3.6 2.1 1.5 7.9 7.0

NNE 1.8 2.1 1.3 1.3 .3 .3 6.9 8.1

NE .5 1.0 1.8 .8 4.1 8.5

ENE .5 .5 1.0 4.0

E .5 .3 1.0 .8 2.6 7.7

ESE 1.0 .3 .3 1.5 3.8

SE 1. 3 1.3 1.0 3.6 4.9

SSE 2.1 .8 .S 3.3 3.8

S I 3.6 2.1 1.5 .8 7.9 .1

SSW 2.3 4.1 1.5 .8 8. 7 5 .5

SW .5 1.8 3,1 1.0 .3 6.7 8.1

CS. 1S. I 5 2.b 1.8 .8 6.7 6.0

; 1.8 3.6 4.9 2.3 12.6 7 .3

WNW I. 3 2.1 1.3 1.0 .8 6. 6.0

ANM 1.8 3.3 .3 .8 .3 6.4 6.0

NhN Jos 1.3 .5 1.8 5.1 7.6

....................................................................................................... ........... .......VARIABLE I

CALM /1//i/j///1 111

1

TOTALS I 22.8 30.5 22.8 13.6 1.3 .5 100o. 6.1

................................................. ................................... ................................. .......................


.i L._

SGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/M&C

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-83,8S-47MONTH: APR HOURS(LSTI: 0303,70500

C-"'" "'"'" ""...........................................................................................................'"......'"..."."" ' "WIND SPEED IN KNOTS

DIRECTION I 1-3 -6 7110 11-16 17-21 22:27 28-.33 34-40 Ml::".7 MB-SS GE S6 TOTAL MEAN0 (DEGREES) I I WIN D

.........................................................................................................................................N 41.8 4.M .3 3.2 .5 14.2 7.60NNE .2 1.8 3,0 1.7 *6 6.4 9.7

NE .2 6 1.4 2.1 6,9

ENE .2 .3 .8 1.2 6.9

E .3 .6 .9 .2 2.0 7.2

ESE .6 .8 .5 1.8 4.9

SE I 3 2.0 .6 2.9 5 .5

SSE 2.3 1.1 ,2 3.5 3.3

C s 1.5 2.8 1.M .6 5.9 6.0

SSW 2.9 2. 3 1.8 .3 6. a 4 .7

SW l. 1 2.6 1.1 .3 .2 S. 2 S.7

WSW !.4l

2.4 2.0 1.5 7.o3 7 -2

clW .9 3.,3 3.0 1.5 8.,8 7.2

WNW 1.? 1.5 2.7 1.1 .5 7.5 7.8

) NW 1.5 2.0 2.8 .9 .2 .2 7.2 7.1

NNW .5 2.8 2.0 1.4 6.2 7.50

VAR 1ABLE I

CALM 3I.5 //l

TOTALS | 17.2 30.1 27.5 12.6 1.8 .2 100oC 6.1

TOTAL NUMBER OF OBSERVATIONS: 6S7

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM POURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-97

MONTH: APR HOURSILST): 06a-08ag................................................................................... .

1 .1.03 SPEED IN KNOT;SDIRECTION 1 1-3 4-6 7-10 11:16 17-21 22:27 28Z33 3990" 41-97 48-55 GE 56 TOTAL ME A N

I DE6RESI I 1 WIND..............................................................................................................................................

N 1.0 3.7 7.7 2.6 .9 15.9 8.9

NNE 1.2 1.5 3.3 2.6 .9 .9 9.5 9.3

C NE 1.1 1.2 1.0 3. 3 8.5

ENE . .*3 1.1 .3 2. 3 6.6

L .8 .4 .1 .1 1.5 1.6KESE I . .s .9 .3 1.6 6.2

SE .7 1.1 1.5 .3 3.6 6.6

SSE 1.0 1.5 1.1 .3 3.8 5.8

S 2.3 2.2 1.6 .3 6.5 5.0

5SW I . 2.1 2.7 .3 5.5 6.9

5W I 8 2.6 2.3 .8 .1 6.7 7.1

WSW .8 2.7 2.6 .7 6.9 6.8

Ai j.5 1.9 2.6 1.1 .3 6.9 7.5

WNW .5 . 2.3 2.3 1 5. s 9.8

N W .8 1.9 1.2 2.2 5.6 8.6

NN I .7 1.9 3.3 2.2 .1 7.7 8 .7

............................................................................................ ..................................................VARIABLE S . 1 98

CAL M I j/It/Ii/II/////I/I//I////III//II~ii/Ii//I/ 6.9 ///

TOTALS 13.7 29.3 35.3 17.9 1.5 . 100o. 7.2

...........................................................................................................................

TOTAL NUMBER OF 0OMSER VATI ONS: 728

. GLOBAL CLIPATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFFTAC FROM FOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-83.85-87MONTH: APR HOURSILSTI: 090C-1100

............................... .. ................................................ o ......... o ........... oo ..............I MTN SPEED IN KNOTS

DIRECTION I 1-3 1-6 7-10 11T16 17-21 22-27 28:33 34-lD 4I-N47 48-55 GE 56 TOTAL MEAN

IDEGREESI I WIND

.9 1.7 S.5 8.9 *6 .5 14.1 10.4NN. I 9 1.8 3.0 5.1 *6 .1 11.6 10.4

. NE . .8 1.0 2.1 .3 4.7 10.1

ENE .6 *8 1.3 1 2.4 6 .6

E .6 1.0 .5 1.2 .1 3. 8 .0

E ESE 1.2 .8 1.0 *V 3. 3 5.8

SE , S 1 1.2 1.9 3.7 9.8

SSE . 1 1.0 1.8 .8 .8 4. 1 9.5

( S Los 2.3 1.3 1.0 .3 6.4 7.2

SSW I s .8 1.8 .5 2.8 7.9

SW I 8 1.2 2.8 1.8 *1 6.3 8 ?

WSW .9 1.8 .9 1.7 4.9 7.8

W ,9 1.3 3.7 1.9 .1 .3 8.2 9.1CMNW ,4 .9 1.8 2.4 .5 .1 6.2 10.7

.) NM .3 ,9 1.0 2.2 .8 .1 4.9 11.0

NNW I . ? 1.2 2.7 .4 5.q 10.5C

......................... o.................. .. . ........... .... . ........................................VARIABLE .1 3.D .9 .3 *1 4.4 10.6

CALM 2.7 III

TOTALS 10.9

17.2 32.2 31.6 4.1 1.3 100.C 9.1

............................................................ ........ ..................oo....... .........o.............

TOTAL NUMBER OF OPSERVATIONS: 779

4

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM HO'RLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITFO KINGDOM PEPIOD OF RECORD: 78-83.85-17MONTH: APR HOURSILSI): 120(1-190

WIND SPEED TN KNOTS1-3 7-1 17-2 1 •Be0oD eBe•0•seeo

DIRECTION I 1-3 6 7-10 11-16 17-21 22-27 28:33 39-40 81'97 48-55 GE 56 TOTAL MEANIDEGR-"ES) I MIND

................................................................................................................................................N .8 2.5 4.5 9.5 .1 .9 12.9 9.7

NNE I S 1.0 2.9 5.9 1.0 .4 10.7 11.7

NE N.1 1.3 1.5 2.4 .5 5. 1C.8

ENE I 3 .8 o5 *6 2.1 8.5

E .6 .6 .8 .9 .4 3.3 9.1

ESE .1 .9 .8 .4 2.1 7.5

SE .5 .9 1.8 2.8 .1 6.C 10.0

SSE 1.0 .8 1.8 1.9 S. 4 8 .5

- S .9 1.1 2.9 1.6 6. 0 8.0

SSW8 .6 ,S .8 1.0 2.9 7.7

SW 1.0 ,1 2.4 1.5 .1 S. 1 8.9

S ,6 .9 1.8 1.1 . 9. 9.2

I 1.1 1.3 3.6 1.6 .6 .9 8.7 9.6

WNN 1.3 .6 i's 2.6 .6 6.6 10.1

Nm .4 .9 1.1 2.3 .4 9.5 11 9

41 4 .3 .9 1.4 2.3 .9 5.1 10.S

.............................................................................................................. .................VARIABLE I.4 9.9 1.5 6.9 9.2

CALM lu /I/u//i// /// //l/ ///i//j///////////i ///////////////////////////i/ I1, S iI/Il

TOTALS 10.0 14.8 33.8 39.9 9.6 1.1 100.0 9.6


-

GLOBAL CLIMATOLOGS BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

SIATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 7T-S3, a-RT

MONTH: APR HOURSILSTI: 1503-1100

.................................................................................................................................................I WIND SPEED IN KNOTS

DIRECTION 1-3 ,-6 7-10 1-:16 17-21 22-27 28-33 34-40 'al-7 8 9SS GE S6 TOTAL ME AN" ~IDEGREESI | IiWN

DGR WIND.........................................................................................................................................

N 1.8 1.6 3.8 2.5 .4 .4 10.5 9.0

NNE .1 .7 5.5 6.2 .8 .3 13.5 11.6

NE .8 1 2.1 3. .3 .3 8.3 10.0

ENE .1 .3 .9 .5 1.8 9.0

E .7 .9 .5 .9 .1 3.1 7.8

E (SE I . 1.0 1.2 *4 3. 7.3

SE , 5 1.0 2.9 1.2 S 1 8 .1

SSE ,3 .8 1.6 1.4 ,1 4.2 9.6

S .5 1.0 3.3 .7 5.5 7.9

SSW 1.2 .9 1.2 .8 .1 4.? 7.3

SW .3 .'4 2.1 1.2 .9 .1 4. 7 10.6

WSW .5 .9 2.6 .9 ..4 S. 4 8 .9

w .5 1.9 3.1 1.3 .4 .1 6.Y 9.3

A d I .8 .9 1.6 2.8 .S .1 6.? 10.9

' h I .7 .9 .7 2.1 .S 9.8 10.4

NN I . 1.0 .9 1.3 3.7 8.4

.................................................................................................... .. .. ...........................VARIABLE I . 2.8 2.6 .1 6. 1o.7

CALM 2.si/IiI/Iu//,,i///iIII i//JI/iIIII/II 2. III

TOTALS I 9.6 15.9 36.9 30.1 4.2 1.3 100.1 9.3

TOTAL NUMBER OF OSERVATIONS: 763

40

GLOBAL CLIMATOLOGV BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR MEATHER SERVCEIMAC

STATION NUMBER: O'5623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-VT


............................... ........................................... ........ o............................................................ .WIND SPEED IN KNOTS

DIRECTION 1-3 R"6 7-10 11-16 17-21 22-2? 2B 33 34-N0 417-7 48-S5 GE 56 TOTAL MEANIDEGR-ES1 I MIND

...................................................... .......* ....... ....................... ..... ..... ............ ..... ............N .1.7 j. 2.0 3.0 .3 .2 8.6 9•00

NNE 1.3 1.6 3.9 4.4 .2 11.3 9.6

NL .6 Z.7 3.4 2.3 9.1 8.3

ENE .5 2.0 1.3 .3 4. 1 6.s

E 1.6 2.0 .3 .3 4.2 4.6

ESE .6 2.0 .9 . 4.4 6.9

SE 1.6 1.3 1.7 .6 S.? 6.Q

SSE .9 1 . .3.9 3. 4

C S .5 2.0 1.1 .3 3.9 6.4

ISM .6 j.9 .5 1.3 .2 4.4 7 .9

S I I

, 2.3 3.0 .8 .2 7.7 7.j

WSM .9 1.9 .9 .5 o2 4 . 7.0

W 1.A 3.1 2.3 .9 7 . 6.2

WNW 1o I 1.3 2.0 1.6 .3 6. 3 8 .4

N w .6 .8 2.0 1.7 .2 .2 5. 5 9.7

NNW .5 .6 .9 .6 2. ? 7.2

......................................"o......... ....... ...... .......... .........oo ......... ........ ....................... ...... o...VAAIARL I .2 .5 .2 o9 11 .8

CALM ,/ /1 It //jjj//IiijI II/ I 6.6/ j/ ji 6.6 illli

TOTALS I IS.8 29.1 27.S 2C.2 1.3 .6 IDOO. 7.1

.......................................................... ....... ................. .................... ..... oo ......... . ............... ..... ,tOTAL NUMBER OF OBSERVATIONS : 690

.6 L..... =m,..,m.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQLENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM 'OURLY OBSERVATIONS

AIR wEAIHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-83,B5-87


I WIND SPEED TN KNOTS

DIRLCTIZON 1 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 43-47 48-55 GE 56 TUTAL MEAN

(DEGREES) I I WIND

N 2.1 2.3 1.9 2.3 .4 9.1 7.8

NNE 3. 1 1.9 3.7 1.6 .4 10.7 7.0

NE 1.4 1.4 2.5 .8 6. C 7,1

ENE .2 .6 .6 1. 6.3

E 1.4 .6 1.4 .2 3.5 5.2

ESE 1.0 .8 .2 .2 2.1 4.6

SE 1.9 2.3 1.0 5.2 4.4

SSE 2.3 1.6 .4 .4 4.7 4.5

S 1.7 2.3 1.2 .8 6.q 5.8

SSW 1.7 2.1 1.0 1.2 6.! 5.9

Sw 1.2 2.1 3.3 1.0 .2 7.8 7.2

WSW 1.9 1.9 1.9 .4 .2 6.4 6.3

1.9

5.4 3.1 .8 11.2 5.8

WNW .4 1.6 1.6 1.4 .2 .4 S.4 9.3

N 1.2 1.0 .8 1.0 3.9 7.3

NNW 1.9 . .4 .2 3. 3 4 .4

ABLE .2 .2 1C.0

CALM I/I I/I I/ I It/I/I/I// I I/I/I/ ///I I//I I/I/I I ////I/I,/I I I /I I I/t/I/II/I // I/ I I //I//I/I I 1 .22 ////I

TOTALS 25.4 28 . 25.0 11.8 1.6 .4 100 1 6.0


0

D GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRO4 HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURV UNITED KINGDOM PERIOD OF RECORD: 78-83,85-97

MONTH: APR HOURSILSTI: ALL

....................................................................................................................................................I wINO SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28:33 34-40 4:,47 48-55 GE 56 TOTAL MEAN

IDEGREES) % . WIND

N 1.3 2.6 4.2 3.2 .4 .2 12.0 89

NNE 1.0 1.4 3.4 3.8 .6 .2 10.4 10.1

0 NE .5 1.3 1.9 1.7 .2 .0 5.5 9.1

ENE .4 .6 .9 .3 2.1 7.1

E .8 .8 .6 .6 .1 3.7 6.9

ESE .6 .9 .7 .3 2.6 6.3

SE .8 1.2 1.4 1.0 .0 4.S 7.4

SSE 141 1.1 1.1 .7 .1 4.1 6.9

S 1.4 1.9 1.8 .8 .0 5, 9 6.5

SSM 1.2 1.6 1.3 .7 .0 , 9 6.5

SM .9 1.6 2.4 1. 1 .2 .0 6. 1 7.9

WSM 1.0 1.8 1.8 1.0 .2 S.7 7.5

W 1.2 2.4 3.2 1.4 .2 .1 8.6 7.8

WNW .9 1.1 1. 2.0 .4 .1 6.4 9.4

NM .8 1.2 1.2 1.7 .2 .1 5.3 9.1

NNW .7 1.2 1.4 1.6 .2 5.' 6 .6

..........................................................................................................................................IABL .2 1.6 .9 .1 .0 2. 10.2

CALM 5.3 1II1III

TOTALS 14.6 22.7 30.9 22.9 2.8 .4 100.0 7.8

. . . . . .. ..............................................................................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQvENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FRO4 HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,BS-97

MONTH: "AV HOURSILSTI: 0001-02nO............................... . .................................................................

I WIND SPEED IN KNOTSDIRECTION 1 1-3 476 7-10 11:16 17-21 22:Z? 28733 34-40 NI-Ni NB-S5 GE S6 TOTAL -qEANIDEGREES) I WIND

2.7 7.2 6.9 2,5 19.3 6.8

NNE 1.0 1.0 1.2 .7 4.0 6.5

NE .2 .7 1.0 7.0

ENE 1.2 1.2 V.8

E .2 1.5 1.5 3.2 5.8

ESE 1.2 .5 1.7 3.1

SE 1.0 1.5 .2 2.7 7.8

SSE I .o .5 1.0 .2 2.7 5.3

$ I 2.5 3.2 1.7 .4 V.6

SSW 2.2 4.9 3.2 .5 10.9 5.8

SW 1.5 5.7 4.4 2.0 13.6 6.9

iWSW .2 1.7 2.5 4.4 6.2

W 1.7

1.7 2.5 .5 6.4 6.1

WNW .5 2.7 1.2 44 5.9

NW .2 5.S 1.0 .7 3. s 7.5

NNW .7 3.0 .7 1.o 5.4 6.2

VARIABLE I .2 .2 .5 11.00

TOTALS I IS.8 37.5 30.4 8.6 100.n 5.8

.............................................................. ....... ...................................................

TOTAL NUMBER OF OBSERVATIONS: qus

* L

-:-/

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM NOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO-BURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURSILSTI: 0300-0530

...................................................... ..; ........................................................I WIND SPEED TN KNOTS

DIRECTION I 1-3 4-6 7-1i 11-16 17-21 2272? 24n33 311-140 41-447 48-55 GE 56 TOTAL MEANo IDEGREES)I % WIND

.......................................................................................................................................N 2.9 501 6.5 3.9 18.6 7.2

NNE 2.3 2.6 1.% .8 7.0 5.5

0 NE ..5 1.1 .3 1.8 4.6

ENE .6 .z .3 1.1 .3KE .5 1.1 .9 2.4 5.3

ESE 1 S 1.7 .2 2. 3 4.3

SE 1.2 .9 1.2 3.3 5.4

SSE .8 .3 1.4 2.4 6.1

S 3.0 2.6 2.3 5 8. 3 5.2

SSW 2.0 3.6 3,3 .8 9. 7 6.3

sW 1.A 3.5 4.6 1.S .2 11.8 7.2

WSW 1.4 2.6 1.1 5. 4.8

W 1.2 1.8 2.7 .3 6. 1 6.4

WNW .6 1.1 1.7 .2 3.5 6.4

(7 NMW .2 2.3 1.7 .3 4.4 6.9

NNW 1.2 1.2 1.2 1. 1 4. 7 6.6

VARIABLE I

CALMf / / / // 7.6 1IIIII

) TOTALS I 20.4 31.8 30.9 9.2 .2 lOD." 5.8

............................................................................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSA FETAC FROMH OURlLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURSILSTI: 06JO-060

C •eWIND SpEED IN KNOTS

DIRECTION 1 :3 4-6 7-10 11-16 17-21 22727 28-33 34-40 41"47 48-SS GE 56 TOTAL MEANo IDEGREESI I W WIND

.......................................................... ...... ...... ............ ............. ......... ..... .... ......1.7 2.5 6.6 5.6 .1 16.5 89

NNE 1.0 3.0 Z.2 1.9 8.1 7.3

) kE 1.2 2.2 *6 o6 4.S S.6

ENE o 1 1.0 .6 .1 1.8 6.2CL I 6 1.2 1.9 3.7 6.5

ESE I .8 .6 1.0 o3 2.2 6.8

SE .8 .6 2,1 3.4 6.7

SSE .6 .8 .8 .1 2.3 5.8

S 1.9 3.2 2.6 1.8 9.1 6.7

SSW 1.1 1. 8.0 1.2 .1 o3 7.T

SW 1.1 1.9 4.0 1.7 .1 8.8 8o

" WIW ,3 . 5 2.3 1,8 S.9 8.6

W I 4 1.8 2.1 1.8 S.6 8.0

WNW 1o 1.2 1.0 .1 3.4 9.3

0 Nw ,,4 1.0 1.7 .7 .4 8o1 8. 8

NNW . 1.1 2.3 Z.1 5.9 8.7

...................................................................... ..............oo......................................... ....VARIABLE I .6 1.1 1.7 11.8

CALM / ff/ / l l wi w 1 1 1, ff If . , l 4 ..6 f / // i l

O TOTALS 9 12.0 25.2 36.5 20.9 1.0 100.1 7.5

............................................................ o o . o ... o ........ •......... ................ .........


msj

2em ~ mImlmm

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME. RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 76-83,8S- 7MONTH: MAY HOURSILSTI 0901-1100.. ... . . . . .. ...... .. o........ .,....... . ..... 1.., ........ , .. • , . .. .

I KI]ND SPEEDO IN KNOTS

DIRECTION I 1-3 9-6 7-10 11-.16 17-21 22-27 28-33 34-O 41-47 46-55 GE 56 TOTAL MEANIDEGREES I % WIND

N 6 2.7 5.7 6.2 .6 15.9 9T0NNE 1.0 .S 3.2 2.B 7.6 9.1

NE I .3 1.2 1.9 1.0 3. 9 6.

ENE . 1.2 .8 .8 3. 6.7

E .4 •8 2.2 ,6 4.0 7 .8

ESE .6 .5 1. 3 012.6 9.4

SE .S .3 1.2 .5 2.6 8.4

SSE .4 I.s 1.2 .8 3.9 7.6

5 1.3 2.3 1.8 1.9 6.8 6.8

SSW 1.3 1.8 2.8 2.6 .5 9.7 9.0

SW .9 3.7 3.0 7.6 98

WIS .* *8 1.9 2.6 5. 7 9.5

I .4 1.2 .9 2.1 .3 4.8 9.6

NW ,. .s 1.9 1.3 .5 9. 10.0

oN N I . .5 1.4 1.3 36 0.S

NNW .3 .3 2.6 1.0 '4.1 9.0

...........................................................................................................................................VARIABLE .3 3.2 3.9 .4 7.7 11.7

CALM I j/j/j//////j j//jj///j/j/j///j/j/j////////j/jj/////j////ii//I/Ii/#/i///i/Ii//////i iU/ 2.6 I///i

C TOTALS I 102 IS. 35.9 33.2 2.6 100.0 6.9


I

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOUENCy OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEED

USAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,6S-87MONTH: MAY HouRS4LSTI= 1?7( 1N30

IN SPEED IN KNOTSDIRECTION I 1-3 q6 7-10 11.-16 17-21 22--Z7 28 33 34'O 41-47 N0S5 GE 56 TOTAL MEAN

2) IDEGREES)I 2 WIND

N .S 2.1 5.2 3.1 .9 12.4 9.8

NNE I 1.1 1.9 2.6 3.3 . 9. A 9 .2

NE .S 1.1 1.6 .9 4.1 7.9

ENE .1 .5 .7 .9 1,7 7.6

E .2 1.? 1.2 1.0 3.7 8.1

ESE o7 1 o 1 .9 2.0 .4 .1 S, 2 99

SE .5 1.0 *2 1.6 3. 3 8 .4

SEC 1 1.5 1.9 .7 4.2 7o9

S 1.1 2.9 2.0 1. 1 .1 7.2 7.2

SSW .6 Jos 2.16 2.0 #6 .1 7.. 10.0

SW .5 .6 2." 2.9 .2 .2 6.8 10.5

WSW o2 1.1 2.1 3.0 .2 .1 6.8 10.1

W 5 .9 2.1 1.s .2 5.2 9.9

WNA .1 .9 1.6 1.7 .1 4.S 10.0

C) NW I l .7 5 1.6 .1 *1 3.2 10.4

N w . .6 1.5 1o9 3.R 8.7

A E , .5 3.7 9.2 .2 9.1 10.7

CALM |/v//m/////i// ///1.////I///////////////////1 /// m I// /i/I/ m /////I/ 1.9 /Sill

TOTALS I 7.1 20.1 32.9 33.0 3.5 .9 1D03.3 9.2

..............................................oo....... ........... ................... .... ........... ...... ... ................ ..... ..... ..,


mil

am m m mmIN1m m la

GLOBAL CLIMATOLOGY BRANC14 PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROq HOURLY OBSERVATIONSAIR WEATHER SERVICE/MACSTATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-03,85-7

MONTH: MAY HOURSILSTI: ISUT-IT7O

.. ......... ........................ ........................... .... ,...WIND SPEED IN KNOTS

DIRECTION 1-3 4-6 7-10 11:16 17-"21 22-27 28.33 3N-0 NI-VT 48-55 GE 56 TETAL MEANC( OEGREESI I S WIND

49 2.3 '43 ,.0 .5 .1 12.3 9.5

NNE .9 1.6 2.S 3.1 .1 8.2 9.3

NE 5 1.7 2.0 1.3 .1 5.6 8.4

ENE .1 .4 1.2 .7 .1 2.5 9.5

E .8 1.2 1.2 1.2 4.3 7.4

rESE .8 2.0 1.6 .1 5.0 8.7

SE. o,3 .8 1.2 ,9 e1 3. 3 8.6

SSE 1.0 .7 2.2 .7 4.6 7.5

S 1.6 2.2 3.N 1.2 .1 8 . 7.3

SSW 1.0 1.4 2.0 I.N .1 b .4 8. 3

SW .8 1.2 3.0 3.4 .1 8.5 9.6

WSW . .8 2.5 2.5 .s 6.4 9.7

W I 7 .9 2.9 2.3 .3 7." 9.6

AN W . .11 .8 1.2 .1 2.9 9.'

SNW .0 .0 1.3 1.4 .1 .1 4.2 9.0

NNW .1 1.7 1.6 .5 4.? 6.9

..... ...................................VARIABLE .1 . 1 2 0 .6 11.4

TOTALS I 11.0 18.9 35.7 29.6 2.6 .4 100.' 8.7

...........................................................................................................................................

TOTAL NUMBER OF 00SEPVATIONS: 767


STATION NUMBER: 035623 STATION NAME: RAF ALC04BURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTI.: MAY 4OURSILSTI: 1AI-2rUO

I WIND SPEED IN KNOTSDIRECTION I 13 4-6 7-10 11-16 17-21 22-27 28-33 34-0 61-.7 8-55 GE 56 TCTAL MEANIDEGREES) I WIND

........... •............ .. .............. •.... .: ....... . ...... .. ,.... .............. •..........................................N 1.6 2.8 3.6 3.6 ,6 12.1 8.5

NNE .6 2.2 4.6 3.0 10.2 8.9

HE .5 3.4 1.q .6 5.9 6 .2

ENE .2 2 .3 ., 3 2.8 7.1

E 1,.,

2.2 2.2 .2 6. 1 5 .5

ESE 1.1 1.1 2.0 .9 5.2 7.1

SE .6 . 1.3 1.6 4. 1 8.2

SSE .9 1.3 1.1 3. 3 5.3

S 1.6 3.3 2.5 .3 7.7 5.9

SSW 1.1 2.8 2.3 1.1 .2 7.5 7,2

SW 1.1 1.6 3,0 1.7 7.4 7.7

WSW 1.1 1.9 1.7 .6 5.Y 6.6

W .8 1.6 2.0 1.3 5.5 7.70WNW I .2 .8 1.3 .2 .2 2.5 8.3

NW .5 .8 .6 .6 2.5 7.6

NNW .5 1.1 1.6 .2 3.1 6.6

VARIABLE I .2 .6 . 12.

CALM 8.1 1//////// j//II////////j j/I B. I III/

- TOTALS I 13.8 28.6 32.1 16.6 .9 100." 6.7


imJ@

GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROA4 HOURLY OBSERVATIONS

AIR MEA THEP SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURy UNITED KINGDOM PERIOD OF RECORD: 78-83,S-87MONTH: MAT POURS(LSTI: 2100-Z300

I WIND SPEED IN KNOTS

DIRECTION | 1-3 4-6 7-10 1116 A7-21 22-z7 28:33 3'4140 '41-7 48-55 GE 56 TOTAL MEAN

(DEGREES) I S WINO...........................................................................................................................................

2.1 3.6 .8 1.5 *12.7 6.9oNNE. 1.3 3.5 3.1 2.1 10.0 7.3

O NE 1.2 2.3 .2 3.6 4,3

ENE .6 1.3 .6 2.5 44.9

E 1.9 1.2 1.5 4.6 4.7

ISE .4 1.7 1.0 3. 1 5.8

SE I . 2.7 1.9 .2 S.6 5.7

SSE .8 1.5 1.2 .11 3.8 6.2

S 3.6 '4.8 1.7 .2 10.0 .8

SS 2. 1 2.7 2.7 1.0 8. 4 6.2

5 1. 1.5 2.1 2.3 1.2 7. 1 6.6

W SW .8 1.9 1.2 3. 5 .4

'4.0 .6 S.4 4.6

WNW c. 1.0 1.0 2.9 5.2

C NW I . 1.S .8 .2 2.9 5.9

NNw .8 .6 .6 .2 2.1 5.6

...........................................................................................................................VARIABLE .2 .2 .4 12.5

I

TOTALS I 20.0 36.1 25.7 7.1 100.C 5.2


4o

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDuSAFETAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO'IBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,8S-R7MONTH: MAY HOURS4LSTI: ALL

.................................................................................................................. ... ........... ..............I WIND SPEED IN KNOTS

DIRECTION I 1-3 -6 7-10 11-16 17-21 22-27 zB.33 39-40 41-47 96-55 GE 56 TOTAL MEANIDEGREESI % I WIND.. . . . . . . . .. .. . . . ..... ......... ..... ; ;....... ... ..... ...... ........... ........... ................ .... o.... ,. .

N 1.5 3.3 5.9 9.1 .4 .0 19.9 8.5

NNE 1.2 2.0 2.6 2.9 *1 8.2 a V2

0NE .6 1.7 1.1 .6 .0 4. 1 6.9

ENE I .3 .8 .7 .3 .0 2.2 6.9

E .7 1.3 1.6 .9 .3 6.5

ESE .7 .9 1.0 ,9 .1 .0 3.5 7.8

S E .6 .9 1.3 .7 *0 3.5 7 .4

SSE 7 1.0 1.9 . 3.s 6.8

C S 2.0 2.9 2.3 .8 .0 8.1 6.2

SSW 1.3 2.9 2.8 1.9 .3 .0 8. 3 7.7

Sw 1.1 1.8 3.9 2.2 .3 8. 7 8 .

WSW .6 1.5 1.9 1.5 1 3 5.6 8.2

W .7 1.6 2.0 1.3 .1 So 7.9

ANN I . .9 1.3 .8 .1 .3 3.6 8 .5

o NW .3 1.1 1.1 .9 .1 .0 3.6 8 .9

NNW , 5 1.! 1.6 1.0 4. 7.6

.. . . . . .. . . . . .. . . . . .. . . . . ..e. . . .. . . . . .. ..o. •Ooe ...... ~ o D .. . . .o. .. . . . . . .

VARIABLE I .1 .1 1 1.8 .1 3o6 11.3

CALM 5.1 /////1//I/jI/ii/ //////iI///,i/IiI/I /// I///iI 5.1 I/I/li

TOTALS 13.3 25. 33.0 21.5 I. .2 10.2 7.5

.. . . . .. . . . . . . . . . . .............. o... ...... ... ............ ... o ....... o ... e..e ........ . ............ ...o.ooo.. ......


mil

"o

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WINO DIRECTION VERSUS MIND SPEEDUSAFTAC FROM POURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO48URY UNITED KINGDOM PERIOD OF RECORD: 7A-B?MONTH: JUN HOURSILSTI: 00DC-Oi0O

I WIND SPEED TN KNOTS

DIRLCTION 1-3 4-6 7-10 11-16 17-21 22727 28A33 34-VO 1I-N? 6-55 GE 56 TOTAL MEAN

IOEGREES) I I WIND

N 3.3 5. 3.5 .2 .2 12.7 5.8

NE 1.0 3.5 2.3 .2 7.1 5.7

kE 1.5 1.5 1.S •4 4.q 6.2

ENE I. .8 .2 1.5 8.0

L 1.7 .2 .6 2.5 8.0

ESE 1.2 1.0 .2 2.5 3.4

SE 1.2 .2 1.5 2.3

SSE .14 1.5 .2 .2 2.3 S.1

$ 1.9 .8 .6 .8 4.1 5.6

SSW 3.1 4.8 2.3 .2 10. 8.9

SW 2 23 3.9 1.7 .6 8.5 5.9

C'WSWA 2.5 4.8 1.0 9., .5

W 4.4 5.2 2.9 *V 12.Q S.0

WNW .8 2.3 1.7 .2 5 . 6.0

WN I 1.S 2.1 .8 .2 .1 4 .9

NNW .2 1.0 1.0 .4 2.7 7.7C...............................................................................................................

VARIABLE I .2 .4 .6 12.0

CALM I./ j iijj l ,//i/j/j/juj ,,7 l/li

TOTALS I 27.C 38.6 21.0 V.6 .2 100.7 V.9

...............................................................................................................................................


•.

-/I

'3GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND OIRECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONS

AIR EAIHER SERVICEIMAC,3STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED XINSDOM PEPIOD OF RECORD: 7T-87

MONTH: JUN HOURS(LSI1: 03a0l-0500

| IND SPEED IN KNOTS

0IRECTION I 1-3 4-6 7-10 1I 16 17-21 22-27 28-33 34-N0 41-47 40-5S GE 56 TOTAL MEAN

o AOEGREES I % WINO

3.3 5.8 2.7 1.3 .1 13.2 5.9

NNE 1.3 2.3 1.6 .3 S.4 S.6

3 N. 4* 1.1 .7 *1 2.4 5.8

ENE 1* 1.1 .4 1.7 5.6

E 1.0 1.0 1.1 .3 3.4 5.9

ESE .7 .4 .3 1.4 4.6

s. .6 .4 .7 .1 1. S 6.2

SSE 1.0 .7 .1 I. 3.8

s 2.8 1.4 1.4 .4 6.1 5.0

SSW 0 4.5 3.m .7 .7 9.8 4 .3

SW I .31 5.0 2.6 .110.41 5.2

o W W I 1 .0 3.3 11.4 5.1

S 1o8 4.8 3.8 3 Ia. n 5 .8CIWNW .9 2.4 1.6 4.8 5.7

N I..3 2.1 1.4 3 4.1 6.6

NNW .4 1.0 .9 .1 2.4 6.0

. .• .•. .e .e .0 . . .J .~ ... ... .. .... . . .. . .. .. . . .. . . o . ... ..

VARIABLE

CALM 8.S I/////ii//i/J//iiJ/I/Ii//i///iI/II//I/i//i/I/I/Iiii//III/i/Ii B. g III

TOTALS 25.4 38.5 23.3 4.1 .1 1og,0 50

TOTAL NUMBER OF OeSERVATIONS: 704

Ii

... - - . .nmJ lu ulm

-/

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOLENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-8?MONTH: JUN HOURSILSTI: 060C-06CO

WIND SPEED IN KNOTS

DIRECTION I I-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 41-47 88-55 GE 56 TOTAL MEAN" IDEGREES) I % WIND

N 1.5 3.3 5.1 .8 10.7 6.8

NNE .7 2.9 3.2 *5 7.4 6.9

NE .7 1.9 1.1 .3 3.9 6.1

ENE . 1.1 . .1 2.1 S.S

E 1.3 1.1 1.5 .1 4 . 5.9

ESE .3 1.3 .5 .1 2.! 5.7

SE e3 .e .4 1.1 5.6

SSE .3 1.2 .e 1. 9 5.1

S 2.4 2.e 2.5 .3 B.,3 5.4

SSW 2.0 2.S l.s 1.3 7.8 6.2

SW I . 7 3.7 8.8 .7 .1 10. 7 6 .6

WSW .8 8.1 2.3 1.6 8.84 7.2

W 1.S 3.3 5.9 1.1 1 11.9 7.3

WNW .K .9 3.2 1.3 5.Q 8.7

NW .3 1.2 1.3 1.7 8. 6 9.1

NNW .7 1.7 2.8 .7 5.5 7.3

VARIABLE I .9 .5 1.5 10.5

CALM I94 2. 9 illIll///jj/Ijiij///It////jj/jj/ji////jjj////j//I//jj/i/////j//j/j///I//j//j 2.9 Illlll

TOTALS I .e?

3.7 37.1 11.2 .3 100. 6.7


-0A

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRFNCE OF SURFACE WIND DIRECTION VERSUS WIND SPEED

USAFETAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: JUN HOURSiLST): 09U,-110............................................... ............................ ......................................................................

I WIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11-16 17-421 22-27 28R33 34-4C 41-47 48-55 GE 56 TOTAL MEAN

DEGREES) I No. . . .. . . . . . ............................ 3...... o...1.3 2.08 3.9 1.1 9.2 7.0

NNE 1.3 1.9 3.1 .6 .1 7.3 6.9

NE .6 .0 2.0 .8 4.2 7.8

ENE *6 .5 1.0 .5 2. 7 6.9

E .6 1.1 1.1 .9 3. 7.0

c0 ESE I .3 .8 1.0 2 . 6.0

SE ;4 .6 .5 .5 1.8 6.4.0SSE 1.1 .4 1 5.6

- S .9 2.8 1.4 .8 5.9 6.2

SSW I 1.0 1.8 1.5 2.7 .1 7. 1 8.8

SW .5 2.7 5.6 1.4 10.2 8.2

" WSW .3 1.7 3.7 2.2 7.8 8.9

A 2.2 2.2 4.5 3.1 .3 12.1 0.1

WNW .3 .6 2.4 2.4 .6 6. 4 10.8

NA I 3 1 .0a 2.4 2.0 6.5 0 .7

NNW .4 1 .4 2.5 1.0 5. 3 7 .7

............................. ........... ......................................

VARIAIBLE,*1 2.9 1.0 *1 4.2 1.0

CALM 2/./II4///// //1///I/////i////I//i/////I//j/// /////// 2.4 //i

TOIALS 10.8 24.7 40.1 20.7 1.3 100.7 7.8

........................................... .............................................................................................

TOTAL NUMBER OF ORSERVATIONS: 706

= - --m..m l I I llll Ihllml I ll L

JGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Or OCCURRENCE OF SURFACE WINO DIRECTION VERSUS WIND SPEEDUSAFETA C PROM4 IOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD Or RECORD: TB-B?MONTH-' JUN HOURSILSTI: 120011400

....................................................................... ............ ...o ........ ......... .................

DIRECTION I 1-3 4-6 7-10 11n16 17721 22-27 28n33 3'440 41747 48-55 GE 56 TCTAL FIE ANIDEGREESI % WIND

..................................... ... ...?.............. ............. ............................. .........................N to 15 2.0 4.0 1.2 8.? 7.3

0/

NNE I .? 1.4 3.5 1.6 7.2 B.0

0NE I .2 .7 .9 .6 2.S 7.9

ENE .1 .7 1.2 .7 2. 9 V.A

E I .6 1.0 1.2 .5 3. 4 6.7

ESE I .2 .5 .6 .1I 1.5 6.8

SE I 1.0 1.2 .7 .2 3 .

SSE I .9 .9 ..6 .2 2o.6 5 .5

Cs I 1. 1 .9 1.7 1.5 .1 So.3 8 .0

SSW I 1.2 2.0 2.6 1.9 .2 a. 1 8.1

SA .4 2.4 3.2 1.9 .2 4. 1 8 .8

CWSW I .6 2.0 5.0 2.1 .1 9.V 8 .4

I .7 2.5 6.1' 1.9 .2 11.4 8.4

WNW I .4 1on 2.4 2.5 .2 6. 5 9 .9

NW I .4 .6 2.0 1.7 .2 5o, 10.0

NNW -*7 1.5 2.4 1.0 5.6 7 .2

VARIABLE I.1 4.2 2.1 .1 .1 6.7 10.7

CALM 1./11 1//////////l///I/l// //////////I//////////// 16 /I/

TOT ALS I 13.9 21.4 42.4 21.9 1.6 .1 100.0 8.1

..................................................... ...............................................................................

TOTAL NUMBER OP OBSERVATIONS: 804

.*

- -/

GLOBAL CLIMATOLOGV BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM LOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-8MONTH: JUN HOURSILSTI: 1503-1700

...........................................................................................................................WIND SPEED IN KNOTS

DIRECTION 1 I-3 14.6 7-10 11-16 17-21 22-27 Z8=33 314-140 141-47 48-55 GE 56 TCTAL MEANIDEGREES1 I W I1ND

N 1.4 2.2 3.1 1.4 .1 8.2 7.3

NNh 1.7 1.9 3.3 2.6 .1 9.6 B.2

N E .6 1.3 1.7 .6 4.2 6.8

ENE .11 .9 1.3 .3 2.18 6.5CE .8 .5 1.7 1.0 4.' 7.B

ESE .5 5 .6 .B 2.4 8.1

S E 5 .3 8 .3 1.8 6.9

SSE .9 .8 .3 p. 2.3 8.0

S .9 1.0 .9 .6 .1 3.6 7.1

SSW -13 1.3 2.7 1.14 .3 6.9 8.5

SW .8 2.4 14.0 1.4 8.6 7.7

O WSW4 1.0 2.4 4.1 .9 8.5 7.4

W - 8 2.9 4.7 4.0 .3 12.7 9.0oWNW .5 2.0 3.6 2.7 .3 .1 9.2 9.2

Nw .5 .9 2.2 1.2 4. 8.1

NNW .8 1.3 1.2 .8 .3 4.2 7.8

VARIABLE I .14 2.0 4.5 10.8

CALM 2. '1 ll//I// //I/ /j I/ ///. / 2.3 //u/

TOTALS I 12 22.8 38.9 22.2 1.5 .1 100.0 B.0

.............................................................................................................................................


*"2

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQLENCV OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-B7MONTH: JUN HOURSILSTI: lBO0-2OO

...................................................... * ...................................................................I WIND SPEED IN KNOTS

DIRECTION I 1-3 4-6 1-10 11-16 17-21 22-27 28-33 34-O 41 7 48-55 GE 56 TOTAL MEAN0 EOGREES3 I W MIND

...................................................................... ...... .............................................................N 2.9 2.9 2.0 8.4 .1 8.6 6.7

NNE I 1o 2.8 3.0 2.5 9.3 7.9

ME 1.2 1.9 1.7 .6 5.4 6.4

ENE 1.0 1.7 1.6 4.3 5.6

E 1.0 2.5 2.2 .4 6.1 6.0

ESE 9 1. .1 .1 2.6 4.9

SE .6 1.4 .9 .3 3.2 6.0

SSE .4 .1 .6 1.2 5.6

S .7 1.6 1.3 .4 4.1 6.5

SSW 1.0 2.0 1.6 1.0 5.7 7.1

Si 1.4 14.1 2.3 .4 83 6.2

O WSW .9 3.6 2.9 .4 7.8 6.5

I 1.9 5.z 3.6 .9 11.6 6.2

WNW .7 3.5 2.8 1.9 8.8 7.5

ANW .4 1.9 1.9 .1 4.3 6.3

NNA I 3 .3 1.3 .1 2.3 T.6

.................................................................................e e..... .................. ........... .. .e .a .e .e• . .e .ee ee . .e ~ . .......... ......... . eoe........ .... o

VARIA 1.3 .9 2.2 9.7

CALM 4.6 lli///i/../j4 ll//I

TOTALS I 16.4 36.1 31.2 11.6 .1 10O.O 6.3

............ ..................................................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQLNCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIN0 SPEEOUSAFETAC FRO4 VOURLV OBSERVATIONSAlR EATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALC0BURY UNITED KINGDOM PERIOD OF RECORD: 18-87

MONTH: JUN HOURSILSTI: 2100-2300........................................................................ •...............................................................................................

MIND SPEED IN KNOTSDIRECTION 1"3 4--6 7-10 11-16 17-21 22-27 28-33 34-40 41-47 48-55 GE 56 TOTAL MEANIDEGR.ES) % WIND

.....................................................................................................................................2.2 3.B 2.4 .9 9.2 5.9

NNE 1.9 2.6 2.2 .3 7.3 5.6

' hE .5 1.9 .7 1.2 4.3 7.3

ENE .5 2.0 1.0 3.6 5.7

E 2.7 1.S .7 .3 5.3 4.2

ESE 1.0 1.5 .2 2.7 4 .2

SE I S .9 .2 .2 1.7 S.0

SSE .9 1.2 .7 .5 3.2 6.4

S 2.2 2.4 .9 .3 S.9 4i9

SSit 1.9 3.6 1.9 .5 .2 8.3 6 .1

S I 2.0 3.9 2.6 .2 8. 7 5.5

WSW 2.7 2 .7 1.4 .3 7.2 5.0

W 3.6 5.5 2.6 .3 11.9 5.2

WNN 1.5 2.6 1.9 .3 6.3 5.6

NW 1.5 2.4 .7 4.6 it.

NNW I S 1.0 .2 1.7 6.6

*;RABL . 5 .2 .7 10.3

TOTALS I 26.3 38.4 Z1.3 5.8 .2 lUO.C 5.0

...............................................................................................................................

tOTAL NUMSER OF OBSERVATIONS: 586

mi.


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURV UNITED KINGDOM PERIOD OF RECORD: 76-87MONTH: JUN HOURS(LST): ALL

....................................................... ......... .. ........................................................I WINO SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-4O 41-47 48-SS GE 56 TOTAL MEAN,' (DEGREES) % WIND

N 2.1 3.3 3.4 1.1 .1 9.9 6.S

NNE 1.2 2.3 2.8 1.1 .0 7.5 7.1

NE .7 1.3 1.3 .6 3.9 6.8

ENE .* 1.1 1.0 .3 2.? 6.5

E 1.1 1.1 1.3 .5 8. 1 6.1

ESE .6 .9 .5 .2 2. 2 5.6

SE .6 .7 .6 .2 2.0 5.7

SSE .. ,9 .5 .1 .0 2. S .7

S 1.6 1.7 1.8 .7 .0 5.9 6.1

SSW 1.9

2.6 1.8 1.3 .1 7. ! 6.7

SW I 1.5 3.8 3.8 .9 .1 9. 3 6.8

WSW 1.3 3.2 3.1 1.0 .0 8. 7 6 .8

W 1.9

3.8 8.8 1.6 .1 11.9 7.1

WNW .6 1.8 2.5 1.5 .2 . 6. 7 8.3

NW I .6 1.6 1.6 1.0 .0 8.8 7.6

NNW .5 1.1 1.6 .6 .0 * 3.9 7.3

VARIABLE 9 1.7 1.0 .0 2.9 10.5

TOTALS 17.1 30.9 33.0 13.6 .7 .0 100.0 6.6

.................................................................................................................................................................

TOTAL NUMBER. OF OBSERVATIONS: 5S8O

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOLENCy OF OCCURRENCE OF SURFACE WINO DIRECTION VERSUS WIND SPEED

USAFETAC FROM HOURLY OBSERVATIONSAIR WEAIHER SERVIC[IMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOO OF RECORD: 78-87MONTH: JUL HOURSILSTI: 0000-0200

................................................................... ................ ........... .. ............................................| WIND SPEED TN KNOTS

DIRECTION I 1-3 4-6 7-10 11:b16 17-21 22-27 28-33 34-0 41-.7 '8-55 GE 56 TOTAL MEAN0IOEGREES) I " WIND

N 28 9 2.4 1. .7 7. 3 5.2

NNE 2.1 1.9 1,2 .3 5.6 5.0

o NE 1.2 1.0 .2 .2 2.6 3.9

ENE I .5 .5 .2 1.2 4.0

E ,.5 .7 .3 1.6 4.6

0 ESE 1.0 .3 .2 1.6 3.4

SE 2.3 .7 3.0 2.6

SSE I 1.6 .7 .3 2.6 3.5

S 2.8 3.1 .3 6.3 3.9

SSW 1.6 1.5 1.9 .3 8.3 S.4

SW 3.5 3.0 1.6 .3 8. 3 4.5

WSW 3.3 4.2 1.6 .2 9.2 4.6

I 3.5 4.2 3.8 .7 12.2 5.6

WNW 1.9 3.0 1.0 .5 6.4 5.11

0 NW 1.7 1.9 1.2 .2 5.0 5.1

NNW .3 1.0 .7 .5 .2 2.8 7.8

...................................................................................................VARIABLE 5 .CA P"55 110/

TOTALS 30.6 33.2 16.S V.0 .2 100.0 V.2

........................................................................................................................

TOTAL NuMBER OF OBSERVATIONS: S5

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRON HOURLY OBSERVATIONS

S- AIR WEATHER SERVICE/MAC

STATION NUM4BER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: JUL HOURSILSTI: 0303-0500

I WIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28:33 34-4D 41-47 48-55 GE 56 TOTAL MEANIOEGREES1 % I WIND

N 1.3 3.9 2.4 1.4 20.9 5.8

NNE 2.1 1.0 1.1 .3 4.5 8.9

NE 1.1 .5 .1 .5 2.3 5.7

ENE .8 .4 .1 1.3 3.4

E 1.1 .5 1.6 2.8

ESE .4 .4 .8 5.7

SE .5 .1 .1 .8 3.2

SSE I 3 .9 .1 1. 3 4 .6

S 2.6 2.0 .6 .1 S.4 4.1

SSW 3. 1 4.0 1.6 B. 4.4

SW 3.0 5.3 1.a 10. 4.7

WSW 3.0 3.5 1 3 3 8. 1 4 •7

W 3.1 S.5 3.9 .4 12.9 5,3

WNW 1.5 4. v 2.1 .5 8.2 5.8

N .9 1.9 1.8 .9 5.4 6.8

NNW 1.0 1.3 .8 .4 .3 3.6 6.6

.......... .................................................................................................................VARIABLE .*6 .1 .8 10.3

CALM 1jill1li///iII/i//i//I /iI//IiI//II // i///J//#I/i/IIIIii/i//II///#///// 13.6 /IlI

TOTALS I 27.9 34.8 18.8 8.8 .3 100.c 4.5


Jo

C GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUPBER: 0356Z3 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JUL IHOURSILST): 0600bOO 0

WIND SPEED IN KNOTS0IRECTION I 1-3 4-6 7-10 11-1 17-21 22-Z7 28-33 344o '4247 48-S5 GE 56 TOTAL MEANDEGREES) I I WINO.. .. .!.. . . . . . .. . . . . .. . . . . . .. . . . ......... .; • • ; ... ... ....... .. .. . .. .. .. . .. .. .. . .. .. .. .

N 2.1 2.3 3.9 1.3 9.6 7.0aE .6 3.7 2.0 .8 6.6 6.7

NE .6 1. ..7 .2 2.9 6.0

EkE I . .8 .2 .1 1.3 6.2

L 1.1 .5 2.6 4.1

ESE .8 .5 .1 .2 1.6 4.8

SE .6 .5 5 1.5 5.3

SSE .5 .4 .1 .1 1.1 5.0

S 1.2 2.0 .7 .2 4.1 5.1

SSW 1.9 3.8 2.5 7.7 53

SW 1.3 2.9 3.5 .8 8.6 6.7

WSW 1.5 2.9 3.5 .5 8.5 6.1

A 2,0 5.5 5.6 1.1 14.2 6 .4

WNW . 2 2.1 4.0 1.S 1 8. V a.3

NW 1.2 1.8 3.1 1.1 7.n I .0

NNW .8 1.8 1.8 1.1 .2 5.6 7.8

..............................................................................................................................................VARIABLE I .1 .6 .7 1.4 9.8

CALM 7/.j/6/I//I///I 7. il//I

TOTALS I 16.4 32.6 33.2 9.7 .8 100. 6.0

...................................................................................................................


It\

GLOB AL CLIMATOLOGY BRANCH PERCENTAGE FREOUENCy Or OCCURRENCE OF SURFACE WINO DIRECTION VERSUS WIND SPEEDUSAFETAC FROM IOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO9BURY UNITEo KINGDOM PERIOD OF RECORD: 78-87MONTH: JUL HOURSILSTI: 0901-1100

................................................ ....................... ..........................................................................MIND SPEED IN KNOTS

DIRECTION 1 1-3 4-6 7"10 11-]6 17-21 22::27 28-33 34-40 41-47 98-55 GE 56 TOTAL MEAN_ DOEGREESI I % WIND

N 1.1 1.3 3.2 2.1 .1 8.0 8.;

NNE .9 1.5 2.6 1.6 .1 6.6 8.0

O NE .8 .9 1.1 .8 3.6 7.0

ENE .3 .8 .2 .4 1.9 7.3

2 .9 .3 .2 3.8 3.9

C ESE .9 .7 .6 .6 2.2 7.2

SE .9 .6 .2 1.7 4.1

SSE *6 .4 *7 .1 1.8 6.0

o S 1.6 .7 1.0 .2 3.S 5.5

SSW .6 2.0 1.9 .6 5.0 6.6CS I 1.1 1.7 3.5 1.2 7.5 7.S

W) VSW .2 1.9 4.S 1.1 .1 7.8 8.2

W 1.0 2.7 6.S 3.1 13.3 8.20WNW .9 21 3.9 2.6 .1 9.3 .5

N 1 .2 2.2 2.6 2.1 .2 6.4 8.3

NNW 1.0 1.6 2.7 1.8 .3 7.4 8.3

.................................................................................................................................VARI.aLE •.1 .2 3.2 Z.6 6.2 9.7

CALM 4.1 111//////JJ#J//J ii, i/ill//li li/I/i /jI/j//jI/// i/I/i//I 1/1/1/1/ I/i i/iI ii/i/ 9 *, | /1111

TOTALS I 1.l 22.9 38.2 20.Z 1.0 100.3 7.9

TOTAL NuMBEP OF OPSERVATIONS: 893

.j •.

-4asm--"Ilm,~vm m _

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: TB-87

MONTH: JUL HOURS(LSTI: 1201-I CO

WIND SPEEO IN KNOTS

DIRECTION I -3 N-6 7-10 11:16 17:21 22-27 28:33 34-NO N-17 48-SS GE 56 TOTAL MEANt- IOEGREESI 2 WIND

N 1. 1.3 2.7 2.2 .3 7.5 9.0oNNE .7 1.9 1.3 1.2 *1 5.1 7.6

NE 1.2 1.3 .9 .7 4.n 6.2

ENE .7 1.3 .8 .N 3.2 6 .N

E 1.0 1.2 .16 . 1 .1 3.8 7.3

ESE ,7 .7 1 .5 2.J 6.6

SE ,1 .5 o? .1 1.? 6.3

SSE .S .9 .7 2. 1 5.N

0 S 1.5 1.2 1.2 .2 4.1 5.N

SSW 1. 3 261 .9 4. 3 V.3oSW .9 1.1 2.5 1.2 6.1 8.0

WSW 1.N 2.9 1.6 .3 6.8 B .8

1 I 1. 2.3 5.6 3.1 .1 12.1 B .6oWNW 1.2 2.1 1.3 3.9 11.5 8.9

o NW .9 .5 2.1 2.0 .1 • 5.6 9.2

NNW .16 1.5 1.6 1.9 .2 5.7 8.N0..............................................................................a ARABE . 65 .9 .2 11.3 9.8

CALM lI,/i///,I/I//iI//,i/// /,/,,//////iii,,i/////////////i/iii,,, /i/,// ii/////I/// 3.1 ///I/

CALM0.1 11110TOTALS 12.4 21.5 36.3 25.2 1.5 J0n.C 8.0


ii

C ,GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDLUSAFETAC FROM HOURLY OBSERVATIONSa 0AIR WEATHER SERVICEIMAC

STATION NUMBER: 015623 STATION NAME: RAF ALC0BURV UNITED KINGDOM PERIOD OF RECORD: 78-A7MONTH: JUL HOURSILSTI: 1530-1700

WINO SPEED IN KNOTSDIRECTION I 1:3 4-6 7-10 11-16 17:21 22-27 28:33 34-40 41!47 48-55 GE 56 TOTAL MEANEDEGREES, WIND

..............................................................................................................................................N 1.0 1.7 2.4 2.5 *I 8.1 8.6

NNE 6 1.2 2.2 .7 .2 4.9 7.7

NE I 1.1 1.6 2.2 .8 5. 7 6.7

ENE I . 1.3 .9 .8 3.5 7.6

E .8 .8 1.2 .9 .1 3.8 7.6

ESE I .2 .2 *6 .6 1.6 9.0

5E I.7 .7 .2 1.6 7.9

SSE I 7 .6 .1 1.3 3.9

S 1.2 1.5 1.3 .1 4.1 5.z

SSW .6 1.5 2.5 .3 4.8 7.3

SW .7 1.9 1.7 1.3 5.6 7.9

WSW I .8 1.5 2.9 1.1 6. 3 7.8

W 1.2 3. 3 6.7 2.5 13. 7 8.1

WNW I * 2.0 9.8 2.9 .2 lo. 9.0FAA .8 1.8 3.7 3.3 .1 9.6 8.7

NN W .4 .9 1.7 2.2 .1 5.8 9.6

VARI..LE 2 3.-2.81.C6.7 .12.CALK 111/ /// I //j I//I I II//I//I/II~I/// II11/111/ 1111/jjjji / /1/1/11/j 2.0 J//fJ/

r,, TOTALS I 11.0 22.5 39.2 23.0 1.3 100I. 1 7.9

........................ .................................................................................................


Iii• •• •L .-4 JOL o 67 1*


STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-67MONTH: JUL HOURSILSTI: 1900-2000

I WINO SPEED IN KNOTSDIRECTION | 1-3 14-6 7-10 11-16 17721 22-.27 ' 28- 33 31-4O 4t47 48-55 GE 56 TVTAL MEANIDEGREESI I W IND

.. . .. . ... .. . .. . .. . . .. . .. . .. . .. . .. . .. .......... . ............ .... .. ... ....... .......

N2.4 1.8 2.4 1.4 .1 6.4

NNE .8 2.2 1.8 1.0 .3 6.4 7.9

NE .9 2.1 2.2 .9 6.1 6.9

ENE .6 1.2 1.3 .5 3.6 7.0

. ,8 2.2 I.4 .3 1 '.6 5.9

ESE .9 .6 1.5 1 3. 2 5.9

SE .9 1.2 .1 .3 2.7 5.2

SSE .9 .8 1.7 3.6

S 1.2 1.3 .6 3.1 4 .5

SSW 1.8 1.8. 2.3 .8 5.9 5 .7

SW .5 1.8 1.8 .5 4.3 7.1

WSW 2.2 1.m 3.0 7.0 5.7

W 2.it 4. 3.9 .3 10.6 5 .9

WNW I 1.3 3.0 3.7 .6 8.6 6.7

Nw 1.3 3.0 3.6 .9 9.8 7.1

NNW I *.3 2.4 2.6 1.2 ,1 7.6 7.3

..........................................................................................................................................VARIABLE I .9 .9 1.9 10.6

CALM h//i/S///i/,,,//,i/I,,I ///// I,/,///,i/// ii//i/ ////////II///,///////// 5.9 I////

TOTALS I 20.2 30.3 33.5 9.7 .8 100.0 6.1

...........................................................................................................................

TOTAL NUMBER OF OBSERV4TIONS: 776

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SFEEDUSAFEIAC FRO9 HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: JUL HOURSfLSTI: 220-2300

.................................................................................................................................................I WINO SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11-16 17-.21 22-27 2833 3N-4O NI-Ni N8-SI GE 56 TCIAL MEAN4OEGREESI I WIND

3.1 2.1 2.1 .9 8.1 5.7

NNE .9 1.5 2.1 *N 4.9 1.1

NE 1.5 1.2 .7 3.4 N.7

ENE .6 .7 1.0 *N 2.9 6.6

E 1.3 .1 2. 4.3 . 3

ESE 1.2 1.2 .1 2.5 3.5

SE 1.8 1.6 .7 4.1 4,4

SSE I 12 1.5 .3 3.0 V.2

rS 2.7 1.2 .7 V.6 3.9

SSW 2.7 2.1 1.2 .1 6.1 4.7

SW 1.3 3.6 2.7 7.6 5.4

WISW 2.1 2.8 1.2 .1 6.? V.7

A 3.3 V.9 2.N .1x. .BWNW 1.0 3.1 2.7 .3 7. 1 .t

NW 1.5 3.0 1.2 4. 4

NNW 1.9 3.0 .9 .9

....................................................................................................................................VARIABLE I . .1

CALM /.4 I /1.111. /1/ / /I / i I 9/j/n//// I I I I / I / I / I/jI i I///, ,'

TOTALS I 28.0 35.9 20.9 3.6

TOTAL NUMBER OF OBSERVA7IONS: 675

, nmmmu m • m.Ili. I ~ IgmA

7 D-.Al99 731 F4 C N U V N! (IND R 1!E NFO o r 2/3

UNCL*SSZFID ' AC S iFI / i

IA

Jillt .25mL

MICROCOPY RESOUTION TEST CHART

1w "

Ai

IE GLOBAL CLIMATOLOG BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDISArETAC FROM HOURLY OBSERVATIONS

AIR MEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-B?MONTH: JUL HOURS(LS1)- ALL

I WIdN SPEED IN KNOTSDIRECTION i 1-3 11-6 710 11-16 17:21 22-7 28-33 39-90 11-7 98-55 GE 56 TOTAL MEANo IDEGREESI f a " " 4 WIND

N " 2.0 2.1 2 p6 1.6 .1 8.5 7.1

NNE 1.0 1.8 1.8 .9 .1 5.b 7.0

NE 2.0 1.3 1.1 .5 3.9 6.2

ENE -.S .9 .6 .4 2.4 6.5

E 1.1 12 .6 .3 .0 3.3 5 It

o ESE .7 .5 .S .3 1.9 5.9

SE .8 o7 tt .1 2.C 9.8

SSE .7 .7 .3 .0 1.8 i.6o5 I 1.8 1.6 .9 .1 4.:3 .7

S5W I 1.1 2.9 2,0 .3 6.2 5.8

Sw |1. 2.6 2.9 .7 7.2 6.91

WSW 1.6 2.9 2.7 .7 .I 7.9 6.5

m0 2.1 9.0 S.0 1.6 .0 12.6 6.8

MN 1.0 2.7 3.9 Ise .1 8.9 7.7

m mM 1.0 2.0 2.5 1.3 .1 6.8 7.9

o NNM .9 1.7 1,6 1.3 *2 5.7 7.8

............. 0.......................................................VARIABLE .0 .2 2.3 2.6 .0 %.fj 9.9

CALM 1 100.0 6.3/ 7.S //1/0/

TOTALS 19.2 28.6 30.6 13.5 .7 100.0 6.3

.......... ........ ..... ................................................

TOTAL NUMBER OF OBSERVATIONS 6377

I GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS IND SPEEDUSAFETAC FROM VOURLY OBSERVATIONSAIR MEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-B7

MONT1: AUG HOURSILSj): 0000-02000 . .....

I WIN SPEED IN KNOTSaIRECTION 1 3-3 96 7-1D 11:16 17:21 22-27 28:33 3-410 41-47 9o-ss GE 56 TOTAL MEANo IDt6R.ESI I W IND

S............................................................................N 3.9 a.0 2.7 .7 11.2 S.9

NNE 1.5 2.2 .7 .3 9.7 4.9

NE 1.3 .2 .3 1.8 4.5

ENE .7 .3 .2 1.2 9.3

E .7 .7 .2 .2 1.7 V.6

ESE .8 .3 1.2 2.7

SE .8 .8 .3 .2 2.2 4.7

SSE .5 .7 .3 1.5 5.3

S 3.7 3.7 .S .7 8.6 V.7

SSW 4.2 2.9 2.7 9.7 V.V

Sw 2.2 9.9 3.9 .2 10.1 5.5

WSW 2.3 6.2 2.S 11.1 S.1

W f# .7 3.4 3.0 11.1 9.8oNW .7 1.8 1.S .5 .2 V. .?2

NW .8 .5 .7 .2 2.2 S.1

NNW 1.2 1.2 .3 .2 2.9 It6

.............................................. ....... .......................................... ............................VARIABLE I .2 .2 .1 11.0

o ICALMN jI/j/IIj/jji//iIi/ii//I/IIil/ /I //I/i//IIIi/ 13.9 l/fIll

TOTALS I 30.D 33.2 16.6 3.7 .3 100.0 9.4

S..........................................................................................................

TOTAL NUBECR OF OBSERVATIONS: 596

__2* icc,

OGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Or OCCURRENCE Or SURFACE MIND DIRECTION VERSUS WIND SPEEDUs ArETAC ROM FOURIT OBSERVATIONS

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURV UNITED KINGDOM PERIOD Or RECORD: ?B-87MONTH: AUG HoURI4LsTl: 0300-0500

0 RCIO - -6 7-10 176 -,1 22 233 34-410 4 1 -%? 48-55 GE 56 TOTAL MEANo (DEGREESI IV IND...... .......... ........... .. x. .

N 37 5. 26 .2 11.5 5.1

NNE I 1.6 1.1 .5 .5 3..6 5.0

o E I 1.0 .5 1.5 1.2

ENE I .4 .6 .2 .1 1.5 5.5

E .2 1.1 6.0

C)ESE 1 .2 *5 Pi .9 5.3

SE I .5 .4 ,1 11 .0 5.3

SSE I p 12 .9 kq 2.5 4.0

o 1 .? 4.1 1.1 .9 7.8 5.5

SSW I .0 5.51 1.6 *1 .2 11.5 5f.8

SM 2.3 5.9 3.,. .2 *1 12.1 5.5

WSWM 2.5 51.0 2.0 .2 8.6 S.1

V I 3.2 4.8 2.? .6 11.5 5.2

WNW I 11 2.7 2,0 .1 .1 6.0 6.0

oNM 1.2 .5 .9 .12. 4

NNMW .4 .7 1.5 .1 2.7 6.9

VAIABLE .1 .5.5 13.3

OTOTALS I 25.2 37.2 20.0 3.7 .5 100.0 5.6

.............................................................................................................

TOTAL NUMBER OF OBSERVATIONS R T

*.UAEA RMHQRYOSRAXN

A--4THRSRVC/A

GLOBAL CLIMATOLOGT BRANCH PERCENTAGE FRCOUENCy OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM POURLT OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORO: 7867MONTH: AUG HOURSILST: 0600-0830

W I ND SPEED IN KNOTSDIRECTION I 1-3 6 7-10 11216 17-21 22:27 28-33 3.-10 -.1-? 88-5 GE 56 TOTAL MEAN

o IDEGREES) M 8 WIND

.......... ;..* . ....................................................................N .3 3.7 3.3 1.2 10.5 6.3

NNE 1.1 2.0 3.3 .7 5.3 6.

o NE I .7 .9 .1 1.7 3.9

ENE I .3 .? .5 1.5 5.S

C I 3 1.3 .2 1.8 8.9

oESE I .2 .5 .1 .8 3.9

SE ,S .3 e3 .1 1.3 6.0

SS .6 1.0 t9 .1 2.7 57

o S 1.8 3.2 1q4 .9 6.9 6.0

SSW !.? 8.6 8. o8 .3 11.9 6.9

Sid 1.6 8.0 3..9 o? 10.3 6.8

o VSW 1.5 2.2 3.3 .9 8.0 6.9

3 .2 8.7 K.0 1.6 13.6 6.3oW:W 1.2 1.6 3.0 .6 6.3 6.8

m Nw .8 1.3 l. .6 4.2 6.S

NN m .6 1.2 1.7 .? 81. 7.1

....... o.... .......................................VRIASL 1.0 *6 01 1.? 11.6

CALM Ii/iiiiii i##/' t/i /itIitii//IiiII/I//I//Ii/i//iI/iII/I//// 7.3 I//I/

o TOTALS 180.6 33.2 31.0 9.5 .5 100.7 6.0

................ ..... ........ . .........

TOTAL NUMBER OF ONSCRVATIONSS 86?

c*K_-4

I GLOBAL CLIMATOLOOV BRANCH PERCENTAGE FREqUENCy or OCCVRRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROq POURLV OBSERVATIONSAIR WEATHER SERVICEIMACo 0STATION NUMBERS 03S623 STATION NAME: RAF ALCONBURV UNITED KINGOM PERIOD OF RECORD: 78-B6

MONTH: AUG HOURSILSTI: 0900-I00............................................

SWIND SPEEO IN KNOTSOIRECTION 13 -6 7-10 1116 17-21 22:27 28o33 34-0 81:87 88-SS 6E 56 TOTAL MAN

o3 DEGREES) I S WINDs . .............. ............................................ .........................

N I .S 3.0 3.1 1.2 8.8 6.9

NNE 1.2 1.5 1.3 . 8.7 6.5

o NEi .7 1.1 1.5 .2 3.5 6.3

(NE .2 1.S .4 2.2 5.8

E .5 1.3 1.3 3.Z 6.1

ESE .5 .3 .7 1.5 5.7

SE 4.5 .8 .4 1.4 81.9

SSE o1.0 . 1.0 *1 2.5 S.7

S 1.0 1o6 2,s 1.2 6.3 7.3

SSW I . 1-s 3.2 1.8 o2 .2 7.5 8.8

SW I * 2.1 3.1 3.1 .1 .1 8.9 9.3

o uSW .8 2.8 3.3 1.s .1 8.1 8.0

Il 1.0 2.5 t.? 8.8 .84 13.1 9.8

W:W 1.1 2.0 3.8 2.1 8.6 8.2

N uN .4 1.% 2.3 1.8 5.6 8.8

NNW .7 .0 3.8 1.2 6.1 8.1o.................. ...... . ..........................................

VARIABLE | .1 2.9 1.8 .5 8.9 11.3

o I

TOTALS I 12.3 281.81 30.5 20.0 1.2 .8 .1 100.0 7.8

S.................................... .... .

T v,

I.TA NI, BE OPa OBSuVttI m m 910mnnmu um u


STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORO: 78-87MONTH: AUG HOURSILSTI: I2UC-1'e00

.... .................................................................................. !..............I wIND SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11.16 17:21 22-2 7 20-33 39-90 elq-? 48-SS GE 56 TOTAL MEANC) IOEGREESI I WIND

.............................................................. ................. ................................. ..........................N *5 1.7 9.0 1.1 .3 7.9 8.0

NNE 1.1 1.7 2.0 .6 S.s 7.0

IE .3 1.1 1.0 *2 2.6 6.1

ENE .6 .5 .4 .2 1.8 5.6

1 1.0 1.1 1.0 .1 3.5 S.5

ESE .2 *6 .S .3 1.? 7.3

SE *. .5 . *2 1.6 S.9

SSE .S .9 .B .2 .1 2.5 6.5

0 S I1.3 2.0 2.7 1.1 .2 7.1 7.0

SSW .5 1.2 26 2.5 .1 .1 7.! 9.

SW .9 1.0 9.2 2.5 .2 8.? 9.2

WSW .4 1.3 3.1 2.9 .3 7.5 9.6

W 1.3 3.7 6.5 S.5 .94 17.3 9.1

WNW .4 1. 2.9 2.5 .1 7.3 9.2

o NW .8 .5 1.9 1.3 .1 9.6 8.5

NNW .2 2.2 2.9 .8 .1 6.1 7.6

............. .......... ... ;...............................................VARIABLE ..2 3.5 3.8 .5 6.1 10.

CALM I//I/ ///II// UI/// i ////////itilm m// ////// / m/m// // 1.3 ill/ill

C TOTALS I 1O.S 22.0 90.9 23.2 2.2 .3 100.0 0.3

...................................................................................

TOTAL NUMBER OF OSEVATIONS: 930

* K

' GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCC4RRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAF ETAC FROM HOURLY OBSERVATIONSAIR WEATH4ER SERVICE/NAC

STATION NUMBERs 03S623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-B7MONTH AUG HOURSILSII: ISOr-1700

W wIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11.16 17-.21 22-27 28-33 13440 1- 47 14-SS GE 56 TOTAL MEAN

. IDEGREES ) % W INO... ... 1.2........... .... . .......................... . ............

N I 1.0 28 3.3 8 3 .1 8.3 7.5

NNE .8 1.5 2.5 1.5 6.4 7.9

o NE 1. 0 1.1 2.0 .4 %.S 6.6

ENE .7 .4 1.5 .2 2.9 7.0

E .1 1.0 .9 .2 2.2 7.1

E SE I .6 .8 .3 1.7 7.9

SE .4 .7 .3 .1 1.5 5.7

SSE .3 1.0 .7 .2 2.2 6.8K S I * 1.3 1.4 1*1 3 5.7 7.6

SSW 1.2 1.9 1.2 1.7 6.3 7.5CS I 1.3 2.1 1.7 3.4 .4 .2 9.2 9.4

WSW .6 2.0 2.3 2.5 .6 8.0 9.0

I 1.0 2.8 6.1 4.4 0 IS*6 9.7

NW .9 2.1 3.9 1.7 8.5 8.1

C. Nw .7 1.1 2.S 2.1 6.4 8.6

NNW .8 1.3 1.1 .4 3.6 6.4

..........................................................................." ARIASLE I .1 3.0 1.7 .2 S.3 10.?

CALM" ~ IIIIIj~//jjj///I//IjI//III///II//i//I//~/ 2.3 ilI/ll

TOTALS I 12.3 23.8 3S.2 22.9 3.2 .3 300.0 8.1

...... OF. .....T.N: 5............................................................TOT7AL NUSER OF OBSERtVATIONS: 90S

oGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEED

USAFETAC FRO14 HOURLY OBSERVATIONSAIR HEATHER SERVICE/MAC

STATION NUMSERI 035623 STATION NAME: RAF ALCONSURT UNITED KINGDOM PERIOD Of RECORDS 78-8?MONTH: AUG HOURSILSII: 18O0-2fjOO

I WIND SPEED IN KNOTS

D1IRECTION I 1:3 %.6b V-10 11:16 1 712 1 22727 26:33 34-40 167 68-SS GE S6 TOTAL MEANol IDEGREE S, A W IND

. ...................................... .......... .

N 11 .6 2. 9 6.6 65

NNE I 1.0 2.0 3.7 .4 ?.1 6.9

o N E .8 2.0 1.9 .1 . S.

ENE I .5 2.1 08 3.61 S.3

E 1.1 1.3 .8 .3 3.6 5.5

o) ESE I .9 .3 .6 .3 1.6 5.%

SE I .6 .6 1.0 .6 2.9 6.7cI

SSE I 1.6 .6 .5 .6 2.9 6.6

O S 1.6 1.3 l.A .1 61.6a 5.5

SSW 1.3 1.6 2.9 .8 6.3 7.0

SM I 2.1 2.1 2.8 1.3 .3 .1 6.7 7.3

W SMW 2.4 3.2 3.6 1.5 .1 11.0 7.0

MW 2.8 3.9 6.9 1.9 13.1S 6.6

MWMW 1.6 1.6 2.3 1.3 . 71

CI NV 1 .0 1.6 1.6 .9 5.3 7.0

NUM g * .6 .9 $1 .1 2.6 b.2

....................... ........ ............ ............ ........ ........

VARIABLE I 6 .s 1.3 10.6

CALit Ij//,p//dd/1 /i / f/////d/t//i//ii/ /// ////ii//iul 6. 7 ii

TOTALS I 21.2 27.6 32.9 11.0 .5 .1 100.13 6.2

) ~TOTAL NUMBUER Of 96518 VATZOds: 793

0

*Q GLOBAL cLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETaC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMERs OS6Z3 STATION NANE: RAF ALCOVBURV UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: AUG HOURSILSTI: 2100-2300

I WIND SPEED IN KNOTSOIRECTION I 1-3 88-6 T-O tll16 17:21 22-27 28:33 34-80 '.-87 48-55 GE 56 TOTAL MEANIDEGRE SE I WIND

N 2*0 1.9 2.6 .3 6.8 S.6

NNE 1.5 2.0 1.7 5.2 5.0

E NE 07 1.6 oft 2.8 8.9

tEE .4 .9 o6 1.9 4 .7

L I.S 1.7 .6 3.8 3.9

O ESE T.7 .8 .8 1.6 5.8

SE ,T 1.2 #1 .3 2.3 5.6

SSE 2.0 1.0 .8 .8 3.9 .9

o S 3.3 .7 1.2 .6 5.8 8.8

SSW 2.9 2.0 2.2 .3 1.8 S.0.0SM 3.S 3.3 3.8 .6 11.2 S.

W NSW 2.6 So 2.9 .3 11.2 5.8

I tI.7 S.1 300 .6 10.8 6.2

vNM 1.0 1.9 1.3 . .8 So1 7.5

0 N .9 2.0 .4 .3 3.6 5.8

NEm .9 1.0 .3 .1 2.3 8.7

.............................. ......................... ........VARIABLE I 3 .3 12.0

CALM 111I/1/tiI i/IIiiliII//t/ II//I//// /I iit ti1// 1///////It//1111 i//#/1111J 118.4 1///

TOTALS I 28.8 32.2 21.6 8.9 .8 loc.~ 8.7

............................... ...............................................................................................

TOTAL NUMBER OF GOUSERATIONS1 669

4.iNN1

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 76-aTMONTH: AUG HOURSfLSTJ: ALL

..................................................................... ......................... ....... ................................. .........I WIND SPEED IN KNOTS

DIRECTION I 1-3 -6 7-10 11:16 17-21 22-27 28A33 31 1-0 41:7 96-55 GE 56 TCTAL MEANSIDEGREES? I a WIND

....... ........... .......... ..................................................... oN 1.9 3.0 3.0 .8 ,1 .0 8.9 6.4

NNE 1.2 1.7 1.8 .6 5.3 6.4

NE I 8 1.1 .9 .2 3.0 S.7

ENE .5 .9 .6 .1 Z.1 5.6

E 7 I.z .7 .1 2.6 5.5K ESE I * .9 .9 .2 1.9 5.6

SE .6 .6 .1 .2 1.7 5.7

SSE .9 .6 .6 .2 .0 2.6 5.5

S 1.6 2.2 1.6 .6 .1 6.6 6.1

SSW 1.9 2.6 2.6 1.0 .1 .0 8.3 6.7

SN W .7 3.0 3.3 1.6 .1 .1 .0 9.8 7.3

WSV 1.S 3.1 2,9 1.3 .1 .0 9.10 70

m 2.2 3.8 4.S 2.6 .3 13.5 7.6

C WNW 1.0 1.•9 2.6 1.2 ,1 60 7

N e7 1.2 1.6 .5 .0 9.3 6.9

..................................................... ..........................................VARIABLE I .1 1.6 .9 .2 2.R 11.0o ICAL" 7./2//// / / /// / /// // / / /, l///

TOTALS I s.? 28.o 30.7 13.2 1.2 .2 .0 l00.1 6.9.. ... A*.................................... ...

TOTAL NUNER OF OeSERVATIONS: .00

J



STATION NUMBER: 035623 STATION NAME: RAF ALCOYBURV UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: SEP HOURSILSTI: 0000-0200

.......................................................... ............ ;;S .......... .......................................| WIND SPEED IN KNOTS

0IRECTION I 1-3 4-b 7-10 11716 17-21 22 -27 28-33 34-140 41-87 48-S5 GE 56 TOTAL MEANIDEGrIES) | I WIND

2.9 2.2 *7 .8 6.2 4.3

NNE 1.6 1.3 .2 3.1 3.6

NE .. *8 .2 .7 4.8

ENE ,.2 .2 8.0

E *8 .2 .S 2.7

ESE .2 .2 .8 2.5

SE .4 .7 .2 1.3 8.7

SSE .5 1 .1 *2 1.8 3.9

0S I 8.6 .2 2.8 9.1 8.3

SSW 3.8 .8 1.5 .S 10.2 0.8

SW 3.8 3.1 3.S 1.1 .5 12.0 6.7

WSW 8.9 9.3 3.8 1.5 19.5 5.6

W 3.6 6. 3.8 13.8 S.2

WNW le . 1.8 .9 .4 ft.? 5.6

NW I . .8 .8 .8 1.5 6.3

NW 1.1 .S 1.3 2.9 S.5

ICI .......................................................................................................CALK | /11 1 // owl /// it tI111 I /I// II/I //.#I/ 1 12.6 lll

TOTALS | 29.5 34.2 18.9 8.2 .5 100.C 4.6

TOTAL NUMBER OF OBSERVATIONS: S89

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO14BURV UNITED KINGDOM PERIOD OF RECORD: T8-37MONTH: SEP HOURSILST): 030C-0500

I WID SPEED IN KNOTS

DIRECTION | 1-3 4-6 7-10 11:16 17-21 22-27 28-33 34-40 414-7 48-55 GE 56 TECTAL MEAN(OODEREE S, I WIND................. o ............ o ..................................................... eoc

2.2 2.4 1.0 .3 S.9

'4.5

NNE 1.8 q 5 2.7 3.6

NE .1 .1 .1 .4 5.0

ENE .1 .1 .3 3.0

E .3 .3 .5 3.0

ESE .4 .8 .1 1.3 4.?

SE .1 .4 .1 .6 4.8

SSE 1.5 .8 .8 3. 4.5

. 3.1 3.6 3.1 .5 10.3 5.3

SSW 5.3 4.0 2.2 .9 12.3 4.8

SW 2.9 6.8 2.9 2.1 .1 .3 15.1 6.6

WSW 3.7 6.9 3.6 1.2 15.4 S.6

W 2.3 S.6 3.2 .9 12.1 6.0

WNW .8 1.S .9 .8 4.1 6.9

Nw 1.2 1.0 1.0 .1 3.y 5.5

NNM I 5 .9 .S 1.9 5.0

VARIABLE I

CALM /////./iiiii/i/i/Iil /II//i//i/////i//I/I/i////i/I /i///Ii/i 10.9 i,../

TOTALS I 26.3 35.6 20.1 6.7 .1 .3 100.0 4.9

............................................................................ ........................................... ..........................


L- o 4-,

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCYv OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM H4OURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALC04BURY UNITED KINGDOM PERIOD OF RECORD: 18-AT

MONTH: SEP HOURSfLSIl*I 0600-0800K WIND SPEED IN KNOTSDIRECTION 1 173 4-6 7-10 11-16 17-21 22-2? 26n33 34-40 41-47 48-55 GE 56 TOTAL MEAN

IEGREES) % WIND

...................................................................................... o........ o.................................. ..N I 1.8 -2.3 2. 1., 7. 7 6.5

o

NNE 1!!0 .9 .4 2.2 4.3

NE I .5 .01 ..6 1.5 5.2

ENE I .6 .1 .7 2.2

E .41 .5 .9 3.3

ESE I . 1, .1 qI.7 9.2

SE I .2 .9 .41 1.5 5.2

SSE .7 1.5 1.3 .1 3.7 5.7

S I 2.1 3.3 2,7 .9 8.9 5.6

SSW I 2..9 4.8 2.7 1.0 11.9 S.6

SW I 2.0 5.6 5.0 2.0 .1 14.7 6.9

O 17.T4 RM6.8RL BSRVTIN

WSW 3.1 6.0 6.0 2.2 .1174 .

t 1.6 3.4 R.3 1.0 .7 .1 11.1 7.5

WNW .2 1.3 2.0 o9 .1 q.5 8.1

oNW I .2 o.7 1.3 .6 2.9 8.0

NNW .4 .5 .7 1.6 6.2

0

.................................................... .....................................'ARIALE 1. .1.2 6.5

CALM Ii8.////////jI/////1u/ ////1/////j/j/////jj/jjj/// .9I /

oTOTALS 1 17.7 32.6 30.1 9.8 1.1 .2 100.0 6.0

TONAL NU MBER F OBSERVATIO NS: RIB

* e2 ' o la ae ooeo ooJ••eoeoo ee ••~oeeeee e•eee o ••ee o

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM 14OURLV OBSERVATIONSAIR WEATH4ER SERVICEIMAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 78-67MONTH: SEP HOURSILST): 0900-1100

.................................................. .............. .. ... ... ... .. ..... ... .... .......... ... .... .. ..... .... ..... .. .I MIND SPEED IN KNOTS

IRECTION I 1.3 -6 7-10 1116 17,.21 22-27 28n33 39-q 9l97 98-55 GE 56 TOTAL MEA NI -DE GREES I r % MIND

............ ................................................... ..........N I T 1.6 3.2 1.8 *1 7.9 8.6

NNE .9 t.2 1.1 3.2 5.9

c NE .2 .1 .6 .1 1.1 6.5

ENE .2 .5 .5 1.2 5.50E .6 . . 9 . 1 2.0 6.5

o ESE e4 .4 .6 1.3 6.2

SE 1.1 .7 .2 .1 2.3 5.4

SSE .7 .6 'S *8 2.6 7.5

S .6 2.9 2.9 1.9 P.4 8.7 8.0

SSW .4 2.3 9.3 1.5 .1 8.6 8.2

SM .7 3.0 S.3 3.6 1 ,12.7 8.8

W MSW 1.2 2.3 k.2 3.9 o2 11.3 8o9

W 1.6 9.2 7.1 5.0 .8 .2 19.0 9.2

WNMW .2 .7 2.6 1.9 .8 6.? 10.7

Al N.2 .4 1.6 2.0 9.2 10.0

NNM 1.1 . 1.1 .1 2.6 9.0C.. ... ................................................................................VAR IAB

r LE 2.8 1.2 .1 94.2 9.8

CALM II/I//////I/i//Ii/I/I/ii/'///'//////////I//I// 1.9 //l

TOALS 9.7 22.6 36.6 29.2 2.8 .2 100.0 8.9


* L

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROn HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-S7

MONTH: SEP HOURSILSTIt 1200-100

o.... ............................. ........ oo.......................... o ........ e.. .... ........... .................."I MIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-110 41-47 4-55 GE 56 TOTAL MEAN

0 (OEG Rf ES J I ... 1 WIND............................................ ....... ............................ ............................................................

N .6 1.6 2.2 1.8 .2 $.9 8.7

0 NNE . 2 .5 1PS .1 2. 3 7.3

0 NE 1.5 .7 2.2 6.3

ENE I .5 .5 S 1. S.0

E I .1 1.8 .7 .2 2.8 6.6

0 ESE .1 .2 .7 .3 1.4 7.8

SE * 2 2 *2 .. .8 5.7

SSE 1 .S !3 1.0 .1 2.1 9.9

o I 8 2.4 2.S 1.6 .5 .1 7.9 8.5

0 SSW .8 2.? .2 1.9 .3 10.1 8.8

SM .7 1.6 3 .S 8.8 .3 11.C 10.2

0 WSW .6 1.3 3.3 2.9 .5 .1 6.6 10.1

M .6 2.8 8.2 6.8 1.8 19.8 10.8

W NW .S i.6 2.7 3.3 .6 8.? 9.9

0 NN .3 1.0 1.? .9 .6 . 8. ? 9.9

NNW .3 .3 1.3 .7 2.6 8.9

0 ............... ................... ....... , ...............................................................................VARIABLE 11.3 1.9 .1 6.8 9.9

0 CALM" /iI // #I/// / Ij/ I// /// ///i///// ///////I/I////// III/iI// 1. I/III

TOTALS 6.* 19.7 38.7 28.0 4.9 .5 100.0 9.2

) ....................... ....4 .. .. . .. ..........................................................................................


L I

C)1

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRO" HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC0STATION NUMBER. 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-B7

MONTH: SEP HOURS(LSTI: 150 -1700............0......................................... . o................ .............SMIND

SPEED IN KNOTSD IRECTION I 1-3 4-6 7-10 1116 17721 22:Z? 28:33 34-90 41:97 48-SS GE 56 TOTAL MEANo (DEGREESI I M HIND

......... s..... .... %.... 0 . ............................... ................. ..................N .? . 1.3 290 1.S .1 S.6 8.3

NNE I . .9 1.3 .1 2.7 7.0

o NE .7 .8 1.3 2.8 5.5

ENE I .5 .9 .6 2.0 5.2

E I S .6 .8 .1 2.0 6.1

O ESE I . .. 4l .1 1.3 9.9

SE 9 .9 .2 .5 1.9 7.7

SSE .2 1.2 1.9 .2 .1 3.2 7o3

oS I . 3.3 3.2 .6 ..1 75 7.2

S$¥ 1.1 3.2 3.6 1.2 .9 .2 9.6 7.9

SM .7 1.9 3.9 9.6 0.9 11.9 9.8

W USW I 1.6 1.S 2.9 2.0 .7 8.8 8.7

H 1,.2 3.9 6,7 9.3 .8 16.9 9.1

WNW .6 1.5 5.3 2.8 1.1 .2 11.5 10.3

o NW 1.2 1.2 2.0 1.3 .2 S.9 8.2

NNH .7 1.9 *1 .8 3.7 ?.1

!............................... .......... ........-. ......................... .................... ......VARIABLE I 2.0 .6 2.6 9.7

CALM lS iiihihjS/ij//jfl/jj ,iij//i//iiI/ii///tJ///J i//iiii ii/ii/#ii//iiiI/iii/i/I/II/ 1.8 ll/ill

O TOTALS I 11.0 29.1 38.1 20.7 3.9 .5 100.0 8.3

S. .............................................. ........................................................................0TOTAL NUMBER OF OI8SERVATIONS: 859

Ii@

0 GLOBAL CLIMArOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCRRSNCE OF SURFACE WINO DIRECTION VERSUS MIND SPEEDUSAFETAC FROM POURLV OBSERVATIONS

AIR WEATHER SERVICEIMACS0STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 7-S?

MONTH: SEP HOURSILST): LBO-20O0

WIND SPEED IN KNOTS

DIRECTION 1:3 *4- 71L0 l1|16 1?21 2227 28:33 34-4 0 41-17 18-5S GE S6 TOTAL MEAN

O IOEGREES) I I WIND

N ... . . . . . . .................................... . .... ... .... . . .. .. .. ......

N ItS 1.9 2#3

.3 5. 6.o0

NNE 1.S .7 .41 . 3.0 5.2

NE 1.1 1.2 ke 3.1 4.9

ENE .9 .3 .7 3.2

E .7 .4 'S 1.6 S.0

ESE Ia. 1.0 1.8 9.2

,SE I .5 .8 .7 .3 2.3 6.1

SSE 1.0 1.0 1.6 3.S S.

O S 3pT 3.3 3,7 .3 .9 11.3 S.9

SSW 3.7 1.6 2.S 91 7.9 .9

SW 3.0 1.9 3.1 1.8 .1 9.9 6.7

o SW 1.8 2.6 2.3 1.S .1 B.3 T.1

W 37 S.3 1.0 1.S 19.2 6.0

WNW 1.@ 2.7 2.3 1.0 .1 B.2 7.1

o NW 1.6 2.9 I.S .7 .1 6.8 6.0

NNM e.S 1.1 .8 .1 3.S 4.7

......................... ........

VARIAL I .1 .1 10.0

o I

O TOTALS I 27.9 26.1 26.7 7.6 1.9 100.0 5.5

S....... . . ...............................................


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS MIND SPEED

USAFETAC FRO9 HOURLV OBSERVATIONS


STATION NUBER: 03S623 STATON NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORD: 76-.$7MONTH: SEP HOURS(LSTI: 2100-2300

WIND SPEED IN KNOTSOIRECTION 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 41:47 so-55 GE 56 TOTAL MEAN

0' IDtGREES) | % WIND

N 2.2 1.3 .8 4.2 4.1

NNE 1.1 .6 .9 2.7 5.2

E N. .6 .8 .3 1.7 6.6

ENE .6 .3 .9 3.0

E .8 .5 .2 1.4 3.4

ESE .8 .3 1.1 2.9

SE .5 .8 *6 1.9 5.5

SSE 2.0 1.6 1.4 5.3 4.6

S 2.5 11.2 2.S .6 *2 1.0.t 5.8

SSW I .1 3.1 1.3 .9 .3 10.0 S.1

SW 3.6 3.5 2.6 1.6 1I.S 6.0

WSW 3.6 .4 3.3 1.9 120 ? .9

M 3.6 4.4 3.6 11.8 5.3

WNW 2.4 1.7 1.3 .5 S.9 5.3

o NM 1.6 1.7 to .S '.6 5.6

NNW 1.1 1.1 1.6 .2 3.9 5.9

.... ...........................................................................................VRIAL .2 .2 12.0

CALM III/ / /1111/111 li. //// / / /I / / S/ # / i S / II I II m m 1OoS /////Io I

TOTALS I 31.4 30.3 21.S 5.8 .s 100.0 is.6

...................................................................................


~L

I ,.j

OGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOVENCV OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM H~OURLY OBSERVATIONSAIR MEATHER SERVICEIMAC

STA7ION NUMBER: 035623 STATION NAME: RAF ALCONSURV UNITED KINGDOM PERIOD OF RECORD: TB-SiMONTH: SEP HOURSILSTI: ALL

- WIND SPEED IN KNOTS

D IREC7ION I 1-3 416 7-10 11!16 17Z21 22-27 28:.33 311740 41-4? 148-S5 GE 56 TOTAL MEANO7 IDE6REESI I W IND

...................................................................................................................................N I 1.5 1.6 1.9 .9 .16. 7

NNE 1 .0 .8 .8 .1 2.7 S.3

o E I .4 .7 .6 .0 1.8 5.8

ENE I 4 .8 .2 1.0 84.8

E I 8 .5 .4 .1 1.s S.4

KESE I .8 .5 .2 .1 .0 1.2 5.5SE .4* .6 .3 .2 1.5 5.7

SSE I .8 1.0 1.0 .3 .0 3.1 6.1

S I 2.0 3.1 2.9 .0 .2 .0 9.1 6.8KSSW 2.6 3.2 2.9 1.0 .2 .0 10.0 6.3

CSM I 2.0 3.9 3.8 2.8 .1 .1 12.3 7.8

oWSM 2 .4 81.0 3.7 2.1 .2 .10 12.8 7.1

S I 2.1 9.3 5.3 2.7 .6 .0 15.9 7.9

N : .9 1 .6 2 . 8 .5 .9.8. . ?

o h .8 1.1 1.8 .9 e1 .0 .3 7.?

oNNW .7 .9 .9 .8 .0 2.9 6.6

......................................................................... ........................

0VARAL 1 .0 1. S .0 .0 1.9 9.3

CALM l/I///,iulj,///j/I./IjIII/j//,iu//I/Iiijj/// 6.9 1//111

OTOTALS I 16.8 27.9 30.1 18.8 2.0 .3 130.23 6.6

............................................................................................

TOTAL NUMBER Of OBSERVATIONSt 6103

*L

6LOBAL CLIMAIOLOGI BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRO" POURLY OBSERVATIONSAIR WEATHER SERVICEINAC

STATION NUMBEN 03S623 STATION NAME: RAF ALCOGBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSELSTD: 0000-02(0

......... ....... 0.............. w................. .... ........- WIND SPEED IN KNOTS

DIRECTION I 2-3 6-6 7-ED 11-16 17-21 22-2? 26-33 3$-40 417:7 8-55 GE $6 TOAL MEANo IDEGREES) I S WIND

... ..... ................................. ....... ............................N 2.7 1.1 1.6 S. 6.5

N 2.S .7 3.2 2.6

E[ 1.3 .2 .2 1.6 2.6

ENE .7 .7 S.0oE 1.4 .5 .2 2.2 3.6

ESE 1.6 .5 *2 2.2 3.6

SE I .1 .7 .* . 2.S 5.S

SSE 1. 1.6 1.3 .4 6.7 5°.

S 2.3 3.1 6.1 .4 .S 10.5 6.8

SSW 3.1 6.0 3.6 2.S .2 13.% 7.1

SW 1.6 1.S 6.9 2.0 . 13.3 7.6

WSW 2.3 S.0 3.6 1.1 12.3 6.2

I 2.5 2.7 2.3 1.6 .2 .2 9.7 7.3

VNw . .7 1.6 eS 3.? 0.3

NW .9 ,S .2 1.6 7.2

NNW .9 .2 .5 .S 2.? 6.S

OTOTALS I 2S.0 27.2 2S3.2 9.9 1%3 .2 200.0 5.6

S.......... ...................................................... ...

TOTAL NMBER OF 065C 9VATIONS 155*!

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC0STATION NUBER: 03S623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 7-86

MONTu: OCT HOURSILSYI: 03000500

...... ..................... ....... .....I WIND SPEED IN KNOTS

DIRECTION I 1-I 66 7010 11-16 1721 22-2? 28:33 36-Va RI-NT VB-s5 GE 56 TOTAL PEAKo IDEGREES) i WIND......................... ...... ............ .....

N I 2.3 1.9 1.3 5 .1 6. $5.3

NNE 1!k 1 1.3 *3 .3 2.9 5.0

oE .6 .1 .1 .9 4.3

ENE .S .6 .5 I.6 S.2

E I ..6 .6 .3 2.5 3.3

I ESE I *B 1.6 .1 1 2.6 4.5

SE .9 .5 .8 .3 2.' 6.1

SSE 1.0 1.0 1.S .1 3.6 5.7

S z9 3.0 6.3 1.1 .S 110. 7.0

SS v 2.9 3.5 2.8 2.6 .1 11.7 7.0

S I 2.0 4.8 3.1 3.3 .4 13.S 7.8

W VSW I.S S.9 3.9 1.0 12.3 6.3

2 *23 3.1 2.0 2.0 .1 9.5 ?.0

WU: 04 .6 .6 .1 1.9 5.9

o NW I ,6 . 1.3 .6 2.5 .6

NU 1.3 S .9 .6 3.3 6.2

S*. . ................................................ARB . .1 9.0

CALM liIIIIII iIIIII /mm /I I/ I will 111 11.2 /11111 1.2 ll/

' TOTALS I 22.3 29.2 21.8 12.S 1.3 300.3 5.8

........................................ . . ...............................

TOTAL NUMBER Of OBSEVATIONSs 798

* ..

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETAC FRON HOURLY OBSERVATIONS

AIR WEATHER SERVICEMNAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSILST): C600-00......... ; .. ... " ....... 0 ....... ..... ..... ................ ••• ....

I ¥IND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11:16 17:21 22:27 28:33 34-40 81-47 48-SS GE $6 TOTAL MAN

o IOEGREES) W Z MIND

......... ..............................................................

N 2.2 1.8 127 .7 6.5 S.8

NNE 1.8 .7 .2 2.3 3.1

o NE .5 .2 .1 .1 .1 1.1 6.7

EkE .S .8 .9 1.7 5.S

E .9 1.6 .6 3.1 4.S

o ESE I . .6 1.2 2.2 SO

SE I S 2.0 '5 o6 3.6 6.2

SSE *6 1.1 .7 .1 2.6 5.4

S 2.6 3.1 3.3 2.1 .9 .1 11.6 7.6

SSW 3.1 S.G 2.6 2.8 .2 12.3 6.9

S¥ 1.2 0.9 3.7 3.0 .6 13.8 8.1

WSW 2.6 %.2 8.1 2O 12.9 6.8

W .6 3.1 3.1 1.8 .1 8.3 7.S

VN 1.0 *6 1.1 .2 3.1 6.2

NM .? .5 1.8 .9 3.1 8.0

NNW '7 .1 11 .2 2.5 6.2

.A.IAULE. . .8 .8 13.3

TOTALS I 19.5 28. 26.2 18.S I. .2 100.0 6.2


*)

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUS aIIr EaC FROM HOURLY OSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER O3S6,23 STATION NAME: RAF ALCORSURV UNITED K|hSOOK PERIOD OF RECORD: 77-11b

MONTH: OCT HOU RSELsTS 0900,II O

I ItOSp IN KNOTSDIRECTION 1.-3 4-6 7-10 11-16 17-21 22r27 26"33 3a0 41-7 46-SS 6 56 TOTAL MEAND IOGRES) I s !iuo

N 1 1.7 2.2 2.2 1.1 ol 7.2 6.7

NE I 7 .7 .7 .1 . 2.6 7.9

NE .7 .4 .6 1.7 4.7

ENE .5 .6 .1 1.2 1.1oE o1 1.9 1.3 .2 ..2 9.1 6.7

ESE I . .6 1.2 .5 2.6 7.6

SE .4 1.2 1,2 .9 3.1 6.8

SSE .S .0 1?3 S 3.1 7 2S .7 2.S 3.4 2.0 2 89 as.5

SSW .T 2.9 491 2.6 .5 .1 10.9 9.0

Sm 1.0 2-6 4.4 6.1 .2 .1 14.6 9.9

W dSW .2 1.9 3.U 3.1 .1 .1 9.3 9.9

..6 1.7 3.1 .1 1.1 10.3 10.3

NN oS 1.2 1.2 2.4 .2 S5 9.9

NW I .6 .6 * a1.9 .9 . 3.9 8.3

Now .2 .6 2.2 1.2 9.2 3.9

VasLs I .2 1.1 . 1.7 13.6

CALK S.1 1111STOTAS 10.4 220 32S 25.7 36 .6 lOO. c i,

........ .............................................................................

OTAL NUMIR Of OS(RVATIONS. SS

-L L

GLOBML CLINATOLOGS BRANCH PCRCCkTAGE FREQL'[NkC OF OCLRRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUs rcTAC FRo4 POURLY OBSERVATIONSAIR WEA NEN SERWVIE/NCA

STATIO NUPREt 0S623 STATION MAR[E RAF ALCOIBURY UNITED iNGO PERIOD OF RECORO: 77-S6NONym: OCT HOURSILST): 120"-1140

I WIND SPEED IN 19NOTS

DIRECTIONI 1-3 4-6 .:10 11-16 17.21 22.°21 2033 34-4D 41-47 88-SS 6E 56 TOTAL KEAN

N 1.1 2.1 1.8 h. 52 6.2 7.6

NE .6 .4 1.2 .2 .S 2.8 8.S

NE S S 1*3 .1 2.3 6.8

[ME 1.3 .S 1.8 S.8

[ I 8 .? .9 .7 .1. 2.8 8.0

Es S .5 * 1.8 .6 01 2.9 6.2

SI .6 .5 1,3 .6 *1 3.3 7.7

SSE I 5 .9 1.9 .S 3.7 7.2

S .5 .9 8.6 2.2 .2 8.81 9.3

SSW o. 1.6 3.3 3.6 .2 .8 9.5 10.3

SM .8 1.2 8,9 8.8 .6 11.8 10.6

vSM e. 1.9 3.8 8.1 .9 .1 10.9 10.7

M ,6 1.9 3P2 8.6 1.1 .7 I1.9 11.3

Vi S 1.8 2.3 2.9 .4 .6 8.1 10*?

N I .7 2.0 Los .8 So ?.3

TW I .8 .8 1,3 1.2 .* 8.8 8.6

................. *. ... .......................................................VARIABLE ..! el .7 . 2.0 11.6

TOTALS I 8.2 3.8 3S.4 28.6 Sol 1.8 100.0 9.3

lOTA. %URE*L OF N6SERVAI1ONSu as?

5o L_

. .. fa -a L~ • - - o-

S GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MINO DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSILSTI: 1500 1700

....... ................. o.....................o....... .. o...o.oo....... .

I MIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11:16 17-21 22-27 28:33 34-40 41-47 46755 GE 56 TOTAL MEAN

SIOEGREES) I I MIND..o. o.. . .. . . . o .~ . .. .o. . . . . . . . . . . ... o . .... .. .. .. . .. .

1.9 1.7 1.3 .8 .2 6.0 6.6

NrE I. *6 .6 .5 3.2 5.2

, NE .4 1.1 .8 o1 2.4 6.1

[NE 1.1 .8 .7 2.6 4.9

E I .8 .4 1.0 .5 .1 2.7 7.2

(SE .2 .7 1.1 *2 2.3 6.7

SE S ,S 95 .8 2.3 8.5oSSE .7 1.0 1.3 .2 3.2 6.5

O 5 I 1. 3.5 4.9 2.0 .1 .1 12.2 7.8

SSW 1.0 1.9 141 2.S *2 .1 9. 8.8

St .S 3.2 3.8 3.0 1.1 11.6 9.7

WSW . 1.4 3.0 2.0 .4 .1 7.? 9.2

WI 2. 2.5 4.6 4.9 lo .1 15.3 92

UNw .2 1.9 2.6 1.2 *6 .1 6.7 9.3

Ow N .6 1 .41 1.S .6 4.2 7.

UN m7 1.1 1.0 .2 .4 3.3 7.0

....................................... ............................................................VARIABLE I.2 .1 .4 11.7

CALM .311/

TOTALS I li.7 23.6 33.0 19.8 4.1 .6 100.0 7.8

TOTAL NUMBER OF OBSERVATIONS% 839

3

ii .

-4i'01

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SFEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURS(LSTI: 18O0-2010

I MIND SPEED TN KNOTSDIRECTION I lb. k '6 7-10 11'16 17-21 22-27 28:33 3Ko0'O K1-!% 08-SS GE 56 TOTAL MEANo EDEGRZES) I WINO

N .1 1.6 .5 *8 '.8 5.5

NNE 1.8 1.2 .3 3.3 3.6

o NE 1.1 1.2 .' 2.7 Is.1

ENE 1.4 .7 .7 2.7 4.4

L I i .1 1.0 2.2 0.9

ESE 1.' 1. 1.0 3.7 '0.7

SE .? 1.0 .7 2.3 5.5

SSE 1.0 1.9 1.8 .1 4.8 5.7

s 1.2 0.0 3.7 1.9 .5 11.3 7.9

SSW 2.5 3.3 3uS 1.9 03 .3 11.7 7.5oSW 1.8 2.3 '.8 3.0 .3 12.1 8.3

o WSW 2.S 2.9 3.7 2.7 .3 12.7 7.6

a 2.2 3.4 4.'0 1.1 .3 11.3 6.9

WNW .7 1.2 1.5 .S 14.C 6.8

NW I . .1 .1 .4 1.1 7.5

NNW .' .3 .7 03 91 1. 0.2

..... ..... . . ;............... ......................................................................................... ...o I

CALM | / I /'i / / I/ i // I 8.? Il/IlI

C TOTALS I 21.7 26.6 28.6 12.8 1.0 .3 100.0 6.3

.............................................................. ................... ........................................................

TOTAL NUMSE* OF OBSERVATIONS: 733

L Ii~

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCy OF OCCURRENCE OF SURFACE WINiD DIRECTION VERSUS WIND SPEED

AIR WEAT14ER SERVICE/MAC

STrATION NUMB3ER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-B6MONTH: OCT 14OURSCLSTS: 2100)-2330

..................................................................................................................................................I - WIND SPEED IN KNOTS

DIRECTION I 1-3 4-6 7-10 11:_16 17:-2 1 22-27 28-33 311-40 411-? 7 B-55 GE 56 TOTAL MEAN(DEGREES) 2 WIND........ .......................................................... .......................................N I 2.1 1.8 1.1 5.6 4.

NNE I 1.7 1.S .2 3.4 3.5

ME .6 .3 .9 2.8

o ENE .2 .2 .3 .6 6.5

E I 2.'4 .5 .8 3.7 3.3

ESE I .6 1.1 .8 2.4 5.0

S E . 6 .2 .3 .3 1.4 6.0

SSE I 1.2 1.5 .9 3. 7 5.1

S 1.5 4.1 3.5 .6 9.9 6.2

SSW 3.5 4.4 6.1 2.0 .2 16. 2 7.0

SW I 2.7 2.9 4.4 3.5 .3 .2 14. 8.2

oWSW 1. 8 3.8e 4.3 2.7 .3 13. 0 7.9

W 1- 11 3. 1 3.8 .8 .2 V.9 7.0

NII I -3 .6 1.7 .2 2.7 6.

C NW I . 9 .3 .3 1.7 6.7

NNW I. .6 .9 1.? 9.8

..................................................................................................................................VAIE I';A

TOTALS 21.4 26-9 29.0 11.3 .9 .2 100. .9

..................................................................................................................................................


*Sd35 qq 61 2. 21.2 7.-427 29 qq 35 3 • '." 8•

- )4~l10 . i3 7 31. .

L .| 3 .8 8 ,289 7.



STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSLSTI : ALL

..................................... ................ ............................. .1 *; SPEED IN KNOTS

DIRECTION I 1-3 1-6 7-10 11716 17-21 22-27 28._33 34-4o 1!77 8-55 BE 56 TOTAL MEAN) EiDEGREESS | " WIND

N 2.0 1.8 1.M 07 *I 6.0 5.9

NNE 1.3 .9 .5 .1 .1 2.9 5.0

NEHE .7 .5 . .1 .0 .0 1.7 5.2

ENE I .S .7 .5 1.7 S.0

E 1.1 .8 8 .2 .1 2.9 5.5

ESE .7 .8 .9 .2 .0 2.6 S.9

SE *6 .8 .7 . .0 2.6 6.7

SSE .8 1.2 1.3 .2 3.6 6.1

S 1.6 3.0 M.O 1.6 .3 .1 10.5 7.7

SSN 2.0 3.1 3.7 2.6 .2 .1 11.7 7.9

SW 1.3 3.3 9.2 3.7 .S .0 13.' 8.9

WSW 1.5 3.3 3.7 2.9 .3 .1 11.2 8.0

W 1.S 2.6 3.3 2.7 .5 .1 10.8 B.6

WNWN ,S 1.1 1.6 1.1 .2 .1 4.5 8.8

NW .S .8 1.1 .5 .0 3.3 7.6

NNW .6 .S 1.1 .7 .1 3.' 7.7

VARI1ABLE I .r0 02 .3 ,1 ,6 12.9

TOTALS I 173 25.1 29.5 17.5 2.6 .5 lO.n 7.0


A-L

J


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77.79.81-86MONTH: NOW HoURSIL5TI: OO000-0200. . .. ............................................................ NH NOV..............................

I WIND SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11:16 1T.21 22-27 28:33 34-40 8t8-7 8R-S5 GE 56 TCTAL MEAN

O IOEGREES1 I s WIND

N 1.9 6.3 2.3 10.5 5.3

NNE 1.0 1.7 .4 3.1 8.1

oNE .6 .8 1.5 3.9

ENE .2 *8 .6 8.3

E 4* .6 1.1 3.4

o ESE .2 .8 08 1.0 5.6

SE 1.0 .6 .+6 .2 2.5 S.0

SSE .6 2.7 2.3 .2 .2 6.1 6.7

S 3.3 2.1 2.9 1.9 .8 11.1 7.8

SSW 2.3 3.3 2.1 1.5 .2 9.8 6.S0 S I 1.5 3.3 5.6 4.8 .2 .2 15.3 9.1

WSW 1.9 1.1 2.3 1.S .2 7.5 7.8

W 2.1 3.8 3.1 1.9 1.0 .2 12.1 8.3

WNW .8 1.3 .6 .8 .8 80 8.5

o NW 1.3 .8 1.3 .6 .2 3.8 7.3

NNW I 2 .6 I.S .8 .2 3.3 9.1

.......... ................................... .................................................................2 ,2 . .8 18.5

CALMq / / /// /// j/// / / ///// 6.3 ill///l

I)ITOTALS I 19.S 30.1 2S.7 13.6 3.6 1.0 1900. 6.8

TOTAL NUMBER OF OeSERVATIONS: 878

.- *2

0

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATH1ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME% RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: TT-86MONTH: NOV HOURSILST1 0300-0500

.................................... o.................................................... ............................................. ........ ..I MIND SPEED IN KNOTS

DIRECTION 1-3 8-6 7-10 11.16 17:21 22-27 2PZ33 38-810 461r%7 8.SS GE 56 TGTAL MEA NIDEGREES) I M MIND

............................o ....... ............. o . . ... o.....o... .. o...N23 2.9 2.2 .3 *6 8.3 6.1

NNE .6 1. .3 2o6 8.5

oE N I .8 .4 .6 .1 los 5.8

EkE .1 1.2 too .3 .1 2o 7.6oE . .1 ,1 .3 1.c 6.3

E (SE .3 .3 1.0

SE *6 .8 .4 .1 1.S 5.5

SSE .7 1.5 1.8 .3 .1 8.8 6.0

o S 1.9 1.9 3.2 2.1 .6 9.6 8.2

SSW I .8 1.9 S.0 3.2 .7 12.1 8o9

SW 2.2 1.8 3.6 5.0 .7 13.2 9.8

WSW 1.8 2.1 3.2 3.8 ,3 10..3 9.

W 1.2 4.1 S.1 2.6 .1 13.2 7.9oNNW .6 .8 1.0 1.2 .1 3.7 Go.

O NW 4* 1.1 A8 .q 2.8 7.0

NNW *6 1.0 1.7 1.7 8.9 8.9

VARIABLE I .3 1 .1 .6 12.8

CALM I /////1///iiii////j///j ji/ jj/j/i/j/iijjj//j# ///.//jji///j///t/I////1,/ T* . di11,

TOTALS I 1S.0 23.1 30.0 21.1 3.8 100.3 7.5

IOTAL NUMBER OF OBSERVATIONS: 726

*

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOuENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WINO SPEEDUSAFETAC FROM HOURLY OBSERVATIONS

AIR WEAIHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 11-66..Q.MTH: NOV HOURSfLSTI: 060C-0600

I WIN SPEED IN KNOTSDIRECTION | 1-3 -6 7-10 11:16 ITz Z-Z7 2,:33 34-40 41-47 48-SS CE 56 TOTAL MEANO EotEREESI I WIND....... .......

1.7 30W 2.3 .o e 6.2

.NE .6 .8 0W 1.8 W.V

lME .1 1.4 .9 .4 2.9 6.6

ENE . 3 .6 4 .8 *g .3 .1 2.. 10.

E e1 .3 pt1 .3. S

o ESE ,as .6 .3 1.3 V4.3

SE .6 .6 .8 .1 2.2 5.6

SSE I . -8 1.3 .V 3.1 6.8

S 1.6 1.6 2.2 2.7 .V 8. A.W

SSW 2e.3 2.6 2.1 3.e ,9 01 it. al e.9

Sw 1.2 3.1 4oe S.6 ,4 .1 15.2 9.4*

WSW 1.2 3.5 5.2 1.0 10.9 1.1

Wi 1.6 2.9 V4.2 2.7 0.V .1 11.6 8.6oWNW ..6 1.6 1.6 .5 .3 .1 .** 8.1

Nu .4 1.2 1.0 1.3 .1 V. 8.8

WNW .6 .W 1.6 1,6 6,2 8.7

........................ 0...............................................................................VARIABLE .1 .3 .3 .6 .8

CALM I/1 /////i/ /I/i/I///////////u///////j//. ////,///i///jjj, i sT il//I

TOTALS 13.9 2S.3 29.2 22.2 3.0 .s .1 100.13 7.6

..............................................................


-I~a

GLOBAL CLINATOLOGY BRANCH PCRCENT AGE FREQUENCY Of OCCURRENCE or SURFACE WIND DIRECTION VERSUS WIND SPEEDuSAF(TAC FRO" HOURLY OBSERVATIONSAIR EAI1HER SERVICE/MAC

STATION NUMJBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH NOv 14OURS|LST): 0903-I11l

- WIND SPEED IN KNOTS0 IRECTION I 1-3 -6 7-10 11:16 17-21 22-27 28:33 34-40 6l-67 %8-SS GE S6 TOTAL EANIOEGREES) I " WIND

.............. ...... ........... ....................... ....................... .........................N o6 2.9 3.3 *9 .6 .3 8.6 8.1

NNE .8 1.1 1.3 3.2 S .7

E N. ,5 1.3 .8 1.0 3.5 7.2

KEE .1 .3 .3 .9 11.9

I .6 .8 .6 .1 2.. b.1

0 E.4 .3 .1 .9 .7

SE .1 *6 .4 .9 6.3

SSE 1.0 1.1 2.0 .8 6.9 6.8

0 S I 1.3 1.9 2.3 2.0 7.5 7.5

SSW 1.6 1.9 3.2 6. 1.0 12.2 9.9

SN 1.1 2.5 6.7 6.3 1.S 16.2 10.6

WSW .9 1.6 4.2 2.7 .6 9.7 9.1

N I 1. 1.3 3.9 3.0 .9 .3 Ic * 9.8

WNW .3 .8 2.2 .9 .6 .1 6.* 10.3

.NW .6 1.1 1. .,6 3.5 10.7

NNW I 6 .6 2.4 1.6 .4 .6 9.8

.............................................................................................................................................

VARIABLE I .3 1.1 .3 .3 1.9 151

TOTALS I 10.8 19.6 32.8 26.6 6.1 1.1 100.0 8.9

........................ ....................................................................................................


A K

3GLOBAL CLIMAIOLOGI BRANCH PERCENTAGE FREGUjENC, Or OCCURRENCE Or SURFACE WIND DIRECTION VERSUS WIND SPEEDUSArETAC FROM HOURLV OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBERs 035623 STATION NAME: RAF ALCO1BIUJR UNITED KINGDOM PERIOD Or RECORO: 7"-66

"OY,: NOV "OURSILST): 12OD-130

WIND SPEED IN KNOTSDIRECTION | 1-3 4-6 7-10 11-16 17-21 22-21 25!33 3%-40 4197 18-SS GE 56 TOTAL MEAN(DEGEES3 I % WIND

.. . . . . . . . . .........................................N 1 i; 3.3 9.1 1.1 .2 .1 9.9 7.6

NNE *5 .7 .5 .6 2.3 7.9

NE .1 *9 .S 1.0 9.5

ENE .6 .2 1.2 .6 .1 *1 3.1 9.7

-- .6 .7 .1 .S .2 2.41 7.9

EE .S .6 .2 .1 1.4 5.6

SE .s .2 .5 1.2 8.9

SSE .6 1.9 1.0. .7 3.7 7.0

.6 2.2 3.1 2.2 .9 *1 8.6 9.0

SSW .5 1.7 1.9 3.1 2.9 * 10.9 12-70

Sm .S 1.6 6.0 6.9 2.2 .1 16.8 11.14

0 WSW .9 1.3 2.9 3.6 .5 6.7 10.3

a I .7 1.2 3.6 S.1 .6 .2 11.s 10.8. 0 I

WNU .6 .7 2.1 1.7 .7 .9 6.2 11.0

0 W I .2 .9 1.3 1.8 .7 9.S 11.6

NNW .2 .S 2.3 1.9 .9 l 9.9 10.4

..................................................................................................... ............................VAR IABLE .5 1.2 .2 .2 2.2 11.9

CALMS |/ */ / // / / / /// //#/ 1.3 iliiito I

0 TOTALS I 7.8 17.1 31.S 31.0 9.0 2.2 200.0 10.1

lot................................................................... ..................................

N0 OTAL NUMBER Of OBSERVATIONS: 629

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS MIND SPEEDUSAFETA C FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDO PERIOD OF RECORD: 77-86MONTH: NOV HOURSILSTI: ISO-I700

........................................................................................................................

I WIND SPEED IN KNOTSOIRECTION I 1-3 4-6 7-ID 11.-16 17-21 22-27 28."33 36-1 a 1-67 68-55 GE S6 TOTAL MEANo 0OEREESl I W MIND

.......................................................................................................................................N 1.2 3.5 3.6 .5 .2 8.8 6.7*0

NNE 1.3 1.1 .6 .2 3.3 S.0

,E .6 .8 .6 .B 2.7 7.3

ENE .4 .6 .2 .2 1.5 10.2

E .8 .* .2 .1 1.6 5.8

S0 ESE .6 .4 .6 .2 1.6 5.8

SSE .4 1.0 S .2 2.1 6.0

SSE S .5 1.6 1.6 1.0 6.6 7.6

s 1-3 2.6 1.7 2.1 .6 8.1 8.4

SS I 1.3 1.9 3.S 2.9 1.1 .4 11.2 9.7

SM .7 2.8 5.7 6.1 1.0 16.2 10.2

W MSW .6 2.1 3.0 2.7 .2 8.6 8.9

11.2 2.1 3.8 2.5 .8 .2 10.7 9.2

WNW 1.f0 1.6 2.6 1.6 .S .6 7.6 9.5

N% .2 .8 1.7 ,S .1 3.6 8.2

NNW .5 .8 1.0 1.2 .1 3.6 0.6

VARABLE .5 .1 .. 6 . ..~~~CALMI | / / /i/d //// // /1 If// / 0, /////// / //// ///// jvli | .3

TOTALS I 12.6 23.6 30. 23.5 5.1 1.1 Io.6 8.3


mi*mlm l lI•dIlmmmmmmlmmmm

J GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND oIRECTION VERSUS WINO SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MACSTATION NUMBER: 035623 STATION NAME: RAF ALC04BURY UNITED KINGDOM PERIOD Of RECORD: 77-86

MONTP: NOV HOURSILSTI: l80r-2L0Q

I MIND SPEED TN KNOTS

DIRECTION 1-3 4-6 7-10 11-16 17-21 22-?? 28.33 38-00 91-:97 4-55 GE Sb TOTAL MEANIDEGREESI I W IND

N 2.0 S.6 1:7 .6 .1 10.0 57

NNE .7 I .0 .? .1 2. 5 5.•6

NE I .3 7 .1 .7 1.8 7.6

EKE .1 .4 .3 .1 *6 1. 1],4

E .4 1.0 .1 .1 1.? 5.7

ESE .1 .8 .7 1.7 5.9

SE . 2.0 .4 2. 5.1

SSE .7 2.0 2.4 *1 S., 6.2

S 2.1 2.5 1.7 1.5 .8 .1 8.8 8.2

SSW 2.7 3.2 2.8 3.8 .3 .3 13.1 8.5

S I .8 2.5 3.8 9.6 .8 12.' 9.8

W SW 1.5 1.7 2.2 2.0 .4 7.9 8.3

S1.8 5.1 1.9 2.9 6 11.8 7.6

WNW .8 1.7 1.1 1.1 .1 1 8.6 8.8

SN W .8 1.1 .7 .3 2.9 S.S

NNW .7 .7 1.1 .8 .3 3.7 8.8

...................................................................... ............... ............................................................VARIABLE I .3 .9 .7 17.00CALM I III/ III/ If/ I /I///I //ip ///// If l t llf 1/1 //I III,, I ///I ////I// / III 1//IpI // 1 6.6I11111

TOTALS I 1S.7 32.0 21.3 19.1 9.6 .6 100.0 7.3

................................................................................................................TOTAL NUMBER Of OBSERVATIONS: 712

). , -

6LOAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVtCEXAC

STATION NUSEOR: 03S623 STATION NAME: RAF ALCOVOLRY L'NJIEO KINGOM PERIOD OF RECORD: 77-86HONTM: NOV HOURSILSTI: 2100-2300

• SPEED IN NOT..;..o...,... .....................DIRECTION i 1-3 V-6 7-10 11f16 11-21 22.-2? 28-.33 3#4-40 417-7 4V-SS GE S6 TOTAL ME ADEIDREES) i M WIND

N 1.6 4.8 2.8 .7 10.1 5.9

NNE .6:6 6 1.0 :1 2.3 6:2

WE( .3 ,.o 7 1.9 8.2

ENEi .1 .6 .3 .1 1.2 B.3

L o3 .7 *I 1.2 5.8

ESE .1 . . .7 V .6

SE ,* .7 1.9 .3 3.V 7.3

StE o. 2.9 1.6 .1 5.4 5.9

S 1.3 3.1 2.0 3.1 .1 9.6 8.3

SSW I. 2.0 2.0 2.9 .V 9.9 8.7

SW 1.3 3.S 3.5 6.3 1.3 .1 16.1 10.0

WSW 1.2 1.9 2.3 2.9 V.3 S.V

V, 2.2 Z.8 3.S 1.6 .3 .3 13.7 7.7

WNW .I 1.2 1.6 .7 .1 V.! 6.S

hW .7 1.3 .9 .3 3.2 6.0

NNW .9 1.3 .9 1.6 4.? 7.6

VARIABLE I 1. 6 . .0 21.4

CALM II,///j,/j/ijij/iijij//j/jj//j/ I/i//Ui/I/Ii 7.3 oqijl

TOTALS 1 3.9 28.3 2V.S 21.9 2.3 1.1 .V 100.0 7.S

.... .................................................

TOTAL NUPSER Of OBSERVATIONS: ba1

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Or OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WATHER SERVICE/AC

STATION NUMBER: 035623 STATION NAME: RAF ALCOVBERY UNITED 8INGDOM PERIOD OF RECORD: 77-86MONT14: NOV iHOURS(LS'I: ALL

......................... .................................. .................................................WINDI SP;ED IN NOS

DIRECTION I 1-3 N-6 7-10 11.-16 17-21 22-27 Z8:33 34-400 41-47 qs-SS GE 6 TOTAL MEANIOE6REES I 3 MIND

N 1.5 .9 2.8 .7 .2 .1 9.2 6.5

NNE .8 1.1 .7 .2 2.6 5.4

NE .3 *8 .5 .6 2.1 7.1

ENE .2 .5 .5 .3 .2 .1 1.8 9 S

E I S .6 .2 .2 .1 .0 1.5 6.1

ESE .3 .5 .3 .0 .0 1.1 5.6

SE .4 .8 .6 .2 2.0 6.1

SSE .7 1.? 1.7 .5 .0 4.6 6.7

S 1.6 2.2 2.8 2.2 .4 .0 .0 8.9 8.2

SSW 1.7 2.3 2.9 3.3 .9 .2 11.2 9.8

SW I 1.1 2.6 8.7 5.7 1.1 .1 IS.3 10.1

WSW 1.1 2.0 3.2 2.5 .3 9.1 8.7

R 1.5 2.8 3,6 2.9 .6 .2 .0 11.I 8.8

ANN .6 1.2 1.6 1.1 .8 .2 .0 S.C 9-3

N *S .9 1.1 .9 .2 .0 3.5 8.6

NNW .5 .8 1.6 1.8 .2 .3 8.8 9.1

................................................................................................. ........ ...................... ........ ........

........ .................. ........ .. . . .. . . .. . .

VAR IABLE .2 .5 .2 2 * .0 .1 1.0

CALM ij/I # // //S / S S•i illll

lTOTALS 13.2 2ao.4a 28.S 23.0 ao,8 10 ,| 100.01 8.].

TOTAL NUMECR OF OBSERVATIONS: 5815

) -m il - i m mm m

0

o- GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WI]NO DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR MEATHER SERVICE/MAC

STATION NURSER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 77-78,.B-86MONTH: DEC HOURSILST): OOD-DinO

I WIND SPEED IN KNOTSDIRECTION 1 1-3 9-6 1-10 11-16 17-21 22-27 28-31 310-40 41-4 48-55 GE 56 TOTAL MEANtO nGREI I I WIND.. .... ..... ... .... .... .... ........ ........... ... ...... ............. .. ....

N.2 .4 .8 .4 .6 2.5 10.3

NkL • * .2 .6 9.0

NE I .2 .8 1. 9.8

ENE .2 .2 .2 . 1.* 8.2

E .4 1.s .8 .6 3.3 6.6

ESE 2.1 .2 .6 3.3 6.0

SE 1,7 1.7 .2 .6 .2 .2 9.6 6.7

SS .8 2.5 2.1 1.2 6.6 7.3

S 2.7 3.3 2,7 2.3 11.0 6.7

SSW 2.5 6.2 1.7 3.7 . .2 1.? 7.9

SW 1.7 3.5 5.2 5.0 .8 16.2 9.1

WSW 1.7 3.5 3.3 2.9 1.2 .2 12.9 8.9

N .8 3.7 2.7 1.S 1.0 9. 8 0.2

WNW .2 1.0 *6 .4 2.3 6.9

mh w*. .8 1.0 1.2 3, i ,

NNW 1.0 *6 1.7 1.6

VARIABLE I

j I

TOTALS 19. 7 31.1 22.2 22.0 4.4 .6 10O . 7b


...* AImm. mmmmmm

GLOBAL CLINATOLOY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE MIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 77-86

.ONTI4: DEC POURSILsTI: 0300-0500

...... .......... ..........""....''''N..........."..........................................WIND SPEED IN KNOTS

D IRECTION 173 4-6 7-10 11-16 17.21 22-27 26:33 34-50 5 !!% 7 48-55 GE 56 TOTAL MEAN"OEGREESI 2 MIND

t I .5 1.5 1.6 .5 .5 4.7 8.3

WNE .5 .S .5 1.5 5.7

NE I .1 .4 .9 .3 .1 1.9 8.6

ENE . ..3 *l .9 3.7CIE 1.2 1.1 .5 2.8 5.5

ESE ., 1.8 1.6 .3 '4.1 6.1

SE *A 1.5 .7 .9 3.5 6.9

SSE 1.2 1.5 2.6 .8 .3 6.4 7,7

S 1.2 2.5 3.1 1.8 .3 9.1 ? .8

SSW 2.5 3.2 2.2 5.1 1.1 13.3 8.7

SW J it. 5.3 5.6 S. 1.2 .3 16.9 9.5

MSM .9 3.2 3.0 2.4 .3 9.9 8.2

..8 2.2 3.1 2.7 1.1 .1 10.0 10.0

WNW .s .8 .7 .9 .1 3.1 8.6

Nb I .3 .7 .5 1.6 3.3J 9.2

NNW .4 .3 .7 1.2 2.6 9.9

VARIABLE .3 .3 15.S

CALM 6. /////// ////////////// /////////////////// 2, J/////,

TOTALS 13.5 25.5 26.6 22.8 4.7 .7 100.0 7.9

TOTAL NUP ER OF OBSERVATIONS: 750

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WINO DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONS

AIR MEATIHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC HOURSILSTI: 0600-08!0

................................ ..... .. • ... •................ ................................... .. ..... .. .....• .I WINDl SPEED IN KNOTS

DIRECIION I 1-3 14-6 7-10 11-16 17-21 22-27 28-33 34-No 41-4i 48-55 GE 56 TCTAL MEAN

oI0EGREES) I W iIND

............................................................................................... ............... ................

N .5 1.6 1.3 1.? .9 5.0 8.9'0NN&. .4 .5 1.2 .1 2.2 7. "

k NE .1 .2 .1 .1 .2 .1 1.0 11.5

ENE .5 .7 .1 1.3 4.3

E .7 1.1 1.1 2.9 5.3

ESE .9 1.1 1.0 .1 3.1 5.6

SE .5 1.3 1.3 1.3 4.5 8.3

SSE .9 1.3 1.2 1.2 .S .! 5.3 8.9

S 1., 16.D 2.6 1.6 .2 10.1 7.1

5SW 2.N 9.4! 2.6 2.7 .9 .2 13.2 8.0

SW 2.9 N.2 5.6 3.9 1.0 .1 17.2 8 .6

C) WSW I 1.3 2.9 N.M1 3.7 ,S .1 12.5 9.0

w 1 2.0 3.2 2.6 .5 .1 9.3 9.0

WNb .2 .s .7 .1 .S .N 2.' 12.9

NM W .4 .7 .9 .1 2.1 10.6

NNW .1 1.2 .6 1.6 3.9 9,7r-. I

VAR IABLE

CALM ///If// 4.3 il., / iljj/j///j///j/#/IIII//I//I///I//////I/////////////// '.3 /I//i

TOTALS I 13.7 27.0 27.9 21.1 '.41 1.6 lno., 8.0

.... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... oe .... ... oe o .....................

TOTAL NUMBER OF OBSERVATIONS: lie

J &

,,1.

m-m4d~N mmmmmmmm mm

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEED

USAFEAC FRO4 HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 7-A6MONTH: DEC HOURSILSII: 09C;D-1170

I WIND SPEED IN KNOI

DIRECTION I 1-3 4-6 7-10 11"16 17-21 22-7 28-:33 34-4O 91-97 9-5S GE 56 TOTAL MEAN(DEGREES) I I ,IND

N .9 1.4 1.3 .9 .2 4.0 7.7

NNE .5 1.4 .2 .1 2.2 5.2

NL .7 .2 .2 .1 *4 1.6 9.9

ENE *9 .2 .1 .7 6.0

L .6 .6 .9 .5 2.6 6.9

ESE .1 .9 1.1 .1 2.2 7.3

SE 2 1.3 1.8 1.8 .1 5.2 9•.

SSE •. 1.9 1.3 1.2 .1 4. 3 8.5

. S 1.3 3.8 3.1 2.6 .1 .6 11.9 8.6

SSW 1.2 3.9 4.0 2.1 1.1 .4 12. 1 9 .2

SW 1. 1 2.8 5.5 3.8 5 .1 13. 7 9.1

WSW 1.5 1 .8 6.3 5.9 .7 .2 16. 0 9 .6

A .9 1.6 3.2 1.8 .5 .1 8. 1 9 .I

WNW .2 .9 .8 1.2 .1 .2 3.5 9.8

NW .1 .5 .8 1.9 .1 3.4 10.9

NNW .2 .9 .6 1.9 .2 3.0 10.

VARIABLE 4.1 .1 5

TOTALS 10.3 22.9 31.5 25.9 3.8 2.1 1 Or. 8.6

TOTAL NUMBLR OF OBSERVATIONS! 952

_Jo

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY or OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: T7-86MONT: DEC MOURSILS=I: 1200-1400

I WND1

SPEED IN KNOTSDIRECTION I 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 41.47 48-SS GE 56 TOTAL MEAN(DEGREES) I S WIND

1.0 1.4 2.0 2.0 .1 6.5 8.3

NNE .6 .3 .3 .1 .2 1.3 8.1

NE .2 .4 .1 .2 .1 1.1 7.5

ENE .3 .1 .3 .7 .1 1.6 9-2

E .4 .7 .7 .4 2.2 7.2

* ESE .3 .7 .6 *6 2.1 7.9

SE .1 1.C .1 1.8 14.0 1C.0

SSE .. ,6 2.1 1.9 .1 5. 1 9.4

S $ 1.2 1.1 2.5 2.0 .3 .6 7.8 10.0

SSW .6 1.7 2.7 4.7 .7 .2 .3 10.5 10.8

SW .6 2.1 5.7 4.2 1.4 .6 3'4.9 11.0

NSW 1.0 1.9 5.7 4.7 .8 .2 14.2 9.8

W .3 2.2 4.0 3.1 .9 .6 11.1 10.5

NN .3 .8 1.2 1.9 .1 .1 4,W 10.1

NW I .1 .7 1.4 1.3 .2 41 9.S

NNb .3 .8 1.3 2.5 .4 .1 S. 5 11.0

VARIABLE ,. .3 . 11.3

CALM 3. 7 111111/Jj//jI j/I jj j//j///j/i///////I///j,////i//jI/#jI///Jjj//jj/ 3.? III

TOTALS 8.1 16.4 31.6 32.3 S.8 2. .1 log.: 9.7

........................................................... ................ ...... ......... ........ .................................


JL

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREOUENCV OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FRO4 HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4IBURY UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH: DEC HOURSILST): 15I1-173O.............................................................................................................................................

I WIND SPEED IN KNOTSDIRECTION 1-3 4-6 7-ID 117,16 17-21 22-27 28:33 34-40 %1-47 48-55 GE 56 TOTAL MEAN

.E (EGREESI V I INO

N 1.2 .9 2.5 1.2 .1 6,2 7.8

NNE .3 .7 .2 .6 .2 .1 2.1 9.7

NE .1 .3 .1 .2 *R 7,

ENE .8 .2 .3 1.3 7.6

E .4 .9 1.0 1.1 3.4 8.0

)ESE .6 .3 .7 .7 2.? 7.b

SE .8 .9 1.7 .8 *2 4. 3 8.1

SSE .2 1.2 1.7 1.4 .1 4. 7 8.9

S 1.3 1.7 3.0 2.0 .3 .3 8.6 8.7

SSu 1.9 3,0 4.1 3.3 *8 13.1 8.S

SW .9 3.7 SS 3.5 *8 .2 14.6 9 .3

WSW 1.3 2.5 4.4 3.0 .3 *1 .1 11.8 8.7

V 1.0 3.1 3.1 2.5 1 .4 /r0.3 a.8

ON W .2 1.0 1.6 .9 3 . 9.5

C) kld 3 .4 1.2 1.2 .1 3.3 9 .2

NNW 1.3 .9 2.3 t.5 9.8

VARIABLE I .1 .1 .2 21.5

CALM 4.7 l/l

TOTALS I 10.6 22.7 31.9 25.1 3.4 1.4 .1 100.0 8.4


1)

-,

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WINO DIRECTION VERSUS WIND SPEED

USAFe TAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOVBORV UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH: DEC .HOURSILSTI: 180r-2L.CO

................................................................... .... ..... ............................. .............

I WIND SPEED IN KNOTSDIRECTION I 1-3 11-6 7-10 11-l6 17-21 22-27 263 3 34-160 91-97 48ASS GE 56 ETAL MEAN

IDEGREESI 1 WIND.................................................................................N .7 *9 .9 *5 .1 . 3 10.3

NNE .3 .5 .7 .8 2.2 9.0

M) E I .3 .4 .4 .3 1.3 6.7

EN E5 .3 .3 . 1.5 6.S

E .* .9 .9 .7 2.9 7.9

C. ESE .9 1.3 .1 2.9 .2

SE 1.2 2.5 1.8 .8 .3 5.5 1.9

SSE .9 1.3 2.2 1.7 .1 6.3 8.3

'2 S 2.2 3.3 4.8 2.2 .7 .3 13. 5 8 .2

SSW 1.5 9. 1 2.e 3.9 1.1 .1 12.9 9.1

SW j.6 3.3 9.6 3.3 .9 13.2 8.7

o WSW 1.6 2.9 3.3 1.6 .1 .4 .3 10.2 8.5

W .8 2.8 2.2 1.2 .* .9 7.R 8.60WNW ,7 .7 2.9 .5 .1 9.9 8.1

o NW I .1 .* .8 .8 2.1 9.2

NNW 8 1.2 1.5 2.0 .1 S.5 8.5

..........................................................................................................................................VARIABLE I1 .1 30.0oCALMN l/I/I //ii/ii/I .. i j/////i//i//tI///Ii/I////ii/I//i///IiII/iI/I// 5.0 11/I

TOTALS 13.5 29.8 30.9 20.3 3.3 1.7 .* 100. 8.0

TOTAL NUMBER or OBSERVATIONS: 757

-.I. L2

I

GLOBAL CLINATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCOBURY LNIIED KINGDOM PERIOD OF RECORD: 77-86MONTo4: DEC HOURSILSTI: 2100-23C0

............................................................................... ....................................................I I IN NOTS

OIRLC'ION O 1-3 4-6 7-10 11-16 17-21 22-27 28-33 34-40 41-47 48-55 BE 56 TGTAL MEANIDEGREES1 ' I WIND

N I N .3 .7 .4 .I 1.9 10.1

NNE I .4 1.1 .7 1.0 3.1 7.7

-E I 1 .1 .5 ,1 1.0 ?.6

ENE .7 .5 1.2 ?.a

E .. .8 .3 S 2. C 6.9

ES E' [I 1.0 1.6 .8 .4 .1 3.9 6.4

SE ,. 1.5 1.2 1.4 4.5 a.0

SSE 1.2 . 1.1 1.6 4.8 8.1

S 1.2 3.1 3.0 2.7 .4t 1a 8.0

SSW 2.0 3.4 2.9 3.4 1.1 .1 12.9 4.9

SI 1.1 5.0 2.9 S.6 1.1 ,1 14 9.4

W SW .8 3.0 3.3 1. •S ,1 9.? 8.1

A I . 2.4 3.7 .7 .7 .4 8.4 9.7

WNNW 1.0 1.6 1.0 .4 .1 4.6 9.5

NA .4 .4 1.2 1.0 .1 3.4 8.7

NNA .3 .8 1.4 1.6 .1 4. 2 9.6

VARIABLE I .1 .1 8.0

CALM 7./////////////// ii////// /// i///// ///i/i// / i///////////////I//// // 7.9 i//li

3 TOTALS I 10.9 26.9 25.7 22.4 49.4 1.2 .5 1o.0 8.0

......................................................................................................................................................


_)i

um iJ

OGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Or OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 03S623 STATION NAME: RAF ALCO40LARV UNITED KINGDOM PERIOD OF RECORD: 77-86

..............................................................................................................................................

I N SPEED TN KNOIlDIRECTION I 1-3 4 6 7-1D 117:16 17T-21 22:Z ? 28:,33 34-40 1 8t7 48-55 GE 56 TOTAL MEAN

O DEGREESP I WIND.............................................................................................. ..................................

N 7.1 1. .5 . .3 .1 8.5 8.5

NNE I .8 .7 .5 .3 .0 .0 2.0 T.6

NE .2 .3 .3 .2 .2 . 1.2 8.5

ENE I .3 *8 .3 .2 .0 1.2 6.7

E .6 .9 .8 .5 2.8 6.7

oESE I .5 1.1 .9 4 .0 2.8 6.7

SE .6 1.3 1.3 1.2 .1 .0 4o.5 8.2

SSE I .7 1.3 1.8 1.8 .2 fj 5.3 8 .8

o S 1.6 2.8 3.1 2.1 .3 .3 10.1 V .2

SSW 1.7 3.5 2.9 3.8 .9 .2 .0 12.7 8.9

III 1.3 3.6 5.0 8.2 1.0 .2 15.2 9.8

W SW 1.3 2.6 8.3 3.2 .5 .2 .0 12.2 9.0

W: I .8 2.8 3.2 2.1 S5 .3 .0 9.8 9.3

o I

WN I * .8 1.2 .9 .2 .1 .0 3.7 9.5

ONW I .2 .6 1.0 1.2 91 .0 3.1 9.6

NNW I .8 .9 1.0 1.8 .1 .0 8.1 9.7

'0

VAIBEI** .1 .0 .9 .0 .2 15.8

CALM S///I/ji,//iiI//i./~IiI///,/I/i,//Ii/iI/I///i .1 I////l

TOTALS 1 1.6 28.1 29.0 28.3 8.3 1.6 .1 IOO.Tj 0.3

1OTAL NUMER OF OBEVTON: 68

C)

*!


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURV UNITED KINGDOM PERIOD OF RECORD: 17-?MONTH: ALL HOURSILSTI: ALL

.......................................................... ..................................................................................I -WIND SPEED IN KNOTS

DIRECTION | 1-3 4-6 7-10 11-16 17:21 22-7 28-33 34-40 41:47 68-S5 GE 56 TOTAL MEAN(DEGREES) I WIND

N 1.6 2.6 2.8 1.5 *2 .0 .0 .0 8.9 7.5

NNE .9 1.4 1.6 1.0 .1 .0 S.t 7.6

NE .6 1.0 1.1 .6 .1 .0 3.5 7.6

ENE .4 .8 *8 .5 .1 .0 2.6 7.4

E .6 1.0 .9 .5 .0 .3 3. T 6.5

ESE .5 .7 .6 *3 .0 .0 2.2 6.8

SE ,S .8 .8 .5 .0 .0 2.7 7.3

SSE .7 1.1 1.1 *6 .0 .0 3.6 7.0

S 1.6 2.3 2.3 1.2 .2 .1 .0 7.6 7.2

SSW I .7 2.5 2.5 1.? .4 .1 .0 8.8 7.8

SW 1.3 2.8 3.6 2.6 .6 .1 0 10.6 8.5

WSA 1.2 2.5 3.1 1.9 .3 .1 .0 9.1 8.1

A 1.3 2.8 3.6 2.4 .5 .1 .0 10.8 8.5

wNw *6 1.4 1.9 1.4 .3 .1 .0 5.7 9.1

N, .6 1.0 1.4 1.0 .1 .0 .0 .0 4.2 8.5

NNW .6 1." 1.6 1.0 .1 .0 .0 6.1 8.3

.........................................VARIABLE I 1 9 ,| 00 1.9 11.5C)

TOTALS I 15.0 25.7 30.3 19.5 3.1 ,8 .1 .0 100.0 7.5

................................................................... ................... .......................................................


.J

GLOBAL CLINAIOLOGY BRA.NCH PERCENTAGE FREQuENCY OF OCCURRENCE OF SURFACE WIND DIRECTION VERSUS WIND SPEEDUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-87MONTH: ALL . OURSILST): ALL

................................................................................................................ * 4; ** ...... .............CEILINGS 200 TO 1400 FEET WITH4 VISIBILTIES 112 MIL OR MRANO(OR

0.CEILINGS ZOO FEEl OR "ORE WITH VISIBILTIES 1/2 TO 2:.112 MILES.............................. ................................................................. ... ..........................................................

I WIND SPEED IN KNOTS0 DIRECTION I 1-3 4-6 7-10 11:16 17-21 22-27 28-33 34-40 41-47 48-55 GE 56 TOTAL MEAN

tOEG6RES) I WIND.. .. . . . . . . . . . . . . . . . . .. .. .. .. .............................................

0 N I 2.1 3.8 4.8 3.2 16 1 .0 .0 14.6 8.2

NNE 1.1 2.2 2.4 2.3 14 .3 8.4 8.4

NE .7 1.3 1.6 1.1 .2 .1 4.9 8.5

ENE 5 1.3 1.2 .7 *1 3.8 7.4

E 1.2 1.6 2.0 .9 .1 5.9 7.0

ESE .6 .9 1.2 .5 .1 .0 3.2 7.1

SE I .7 1.2 1.2 .9 .1 .13 4.1 7.7

SSE 1.0 1.8 1.6 1.0 .1 S.S 7.1

S 1.9 2.6 2.6 1.5 .2 .1 8.8 1.3

5SW 1.6 2.5 2,3 1.5 .2 *1 .0 8.2 7.5

SW 1.2 2.1 2.4 2.3 .2 .1 8.2 8.3

WSW 1.0 1.4 1.2 .7 .1 .0 .0 4.5 7.1

W I 1.0 1.3 .9 .2 .1 .3 3.4 5.8

WNW .5 .6 .5 .3 .0 .1 .0 2." 6.9

NW .6 .8 .6 .5 .0 .0 2.4 6.9

NNW .8 .9 1.0 1.1 .3 4.1 8.4

................................................................................... ............................................................

VARIABLE C . .2 .3 .0 .0 .6 12.3

CALM I// 7,5 I//i/

TOIALS I 16.5 26.2 27.5 18.9 2.6 .7 .? .0 100.0 7.1


--J

PPPPPPPP AAALAA RRPRRA lIIll 000000

pp p AAAA LAA PR OR IT DO 00pp p AA AA RR PR IT 00 0O

PP AA Al OR OR IT DO 00pp AA A A R RR TV 000000000

C CEILING VERSUS VISIBILITY AND SKY COVER SUMMARIES

CEILING VERSUS VISIBILITY SUMMARY

THIS SUMMARY 1S A BiRVARIATE FREQUENCY alSTRIBUTZON By CLASSES OF CEILING FROM "a" THROUGH EQUALToODR GRE'AIER T "AN 2~0 Go FEET AND AS A SEPARATE CLASS " NO CEILIN GI -,VERUS VISIBILITY I

N 16

CLASSES FRM ZERO TIARoUG EUAL TO OR GREATER TVAN 10 MILES T

SATA DERIVED FROM HOURLY OBSERVATONS.

FREUNCY DISTRIBUTION PRESENTED BY TE STANLARD 3-NOUR TIME GROUPS BY MONTH MONTHLY AN ANNUALLY (ALL ELARSCODSBINEA)RD

NOT ES :

BEGNRING IN 1966, TAR STATIONS REPORT D VISIBILITIES TO 6 LES AN GREATER THAN6 M LES. THEREFORE THE COLUN FOR VISIBIL ES EQUAL TO OR GRATER THAN 10 FILTS,A APPEAr ;L ANK.

. AS A RULE, AIRWA VS STATIONS NORMALLY REPORT VISIBILITIES TO 6 MIlLES AND 7 OR GRE'ATER. HOWEVERSO0ME S TAITTONS RE.PORT , GHAE R VALUE S . THEREFORE, THE 10 MILE VISIBILITY COLUMN SOMETIMES CONTAINSMALL PERCENTAGE VALUES. V'OMEVER, TlIESE VALUES ARE OF LITTLE ME ANING AND SF40ULD BEDI]SRE GARDE(D.

FOR METAR CIVILIAN STATIONS REPORTING "CAVOK", ALL CEILINGS ABOVE SODOO FEET WERE SUPPESSED70 50CO FEET. THERrFORE, NO PERCENT VALUES APPEAR ABOVE 5000 FEET.

SKY COVER SUMMARY

PRESENTS PERCENTAGES OF SKY COVER IN EITHER IoTtS OF COVERAGE OR -AIRWAYS CLASSIFICATIONS-.

C DATA SUMMARIZED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH, MONTHLY AND ANNUALLY (ALL YEARS COMBINED$.

ALSO PRESENTED ARE MEAN SKY COVERS.C)FOR AIRWAY STATIONS, THE CONVLRSION FROM THE AIRWAYS DESIGNATIONS TO IOTHS FOR PRESENTATION ARE:

CLEAR - Gil

SCATTERED - 3/10

BROKEN 91la

OVERCAST - 1/ 10

OPSCURED - 1i/10

.J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC--)

STATION NUMBER: 035623 STATION NAME: RAF ALCOOBURY UNITED KINGDOM PERIOD OF RECORD: 79,62-87MONTH: JAM HOURS(LSTI: 0000-010

CEILING VISIBILITY IN HUNDREDS OF METERSIN I 01 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

3 FEET I 160 90 so 60 08 I0 32 V4 20 16 1? 10 8 5 0 0

NO CEIL I 32.2 32.9 33.7 33.9 30.1 34.1 30.5 34.6 35.6 3S.6 35.6 35.6 35.8 35.8 36.5

GE 200001 35.1 36.3 37.0 37.2 37.5 37.S 37.7 37.9 38.9 38.9 38.9 38.9 19.1 39.1 39.9") GE 150001 35.1 36.3 37.0 37.2 37.5 37.5 37.7 37.9 38.9 38.9 38.9 38.9 39.1 39.1 39.9

GE 160001 35.1 36.3 37.0, 37.2 37.5 37.5 37.7 37.9 38.9 38.9 38.9 38.9 39.1 39.1 39.9GE 140001 35.1 36:3 37.0 37.2 37.5 37.5 37.7 37.9 38.9 38.9 38.9 38.9 39.1 39.1 39.9GE 120001 35.6 36.6 37.5 37.7 37.9 37,9 38.2 38.0 39.0 39,4 39.0 39.0 39.6 39.6 40.3

GE 100001 36.0 37.2 37.9 38.2 38.0 38.0 38.7 38.9 39:9 39.9 39.9 39.9 *01 40.1 *08G 90001 36.3 37.5 38.4 38.7 38.9 38.9 39.1 39.0 03 4*y.3 **03 00.3 00.6 *006 0 1,3GE 80001 37.7 36.9 40.b 02.0 02.2 02.2 02.5 02.7 03.9 03.9 03.9 03.9 50.2 00.2 00.9GE 700131 3.:9 90:1 01.8 43.2 43.4 43.0 03.7 03:9 45 0 5.l 05.1 05. 1 0 5.3 45.3 06:1GE 6OODS 38.9 01 01.8 03.2 03.4 53.0 03.7 03.9 05.1 0.1 0.51 05.1 05.3 4.53 06.1

GE 500| 00.8 42.2 03.9 05.3 05.6 05.6 06.1 016.3 07.5 07.5 07.5 07.5 07.7 07.7 08.0GE 05005 01.3 03.0 00.6 46.1 f6. 3 06.3 06.8 07.0 08.2 08.2 08.2 08.2 58.0 49.0 09.2GE 000 08.2 50.6 52.5 53.9 50.2 50.2 50.7 501.9 56.1 56.1 56.1 56.1 56.3 56.3 57.0GE 350 01.3 50.2 56.3 57.8 58.0 58.0 58.7 58.9 60.1 60.1 60.1 60.1 60.0 60.0 61.1GE 30001 59.2 62.3 60.9 66.6 66.8 66.8 67.5 67.8 69.0 69.0 69.0 69.0 69.2 69.2 69.9

GE 25(.O 60.6 637 67.8 69.5 69.7 69.9 70.6 70.9 72.1 72.1 72.1 72.1 72.3 72.3 73.0G 20001 60.7 b660 72.3 70.7 74.9 7S.4 76. 76.0 77.8 78.0 78.3 78.3 78.5 78.5 79.2GE 18001 65.6 69.0 73.3 75.7 75.9 76.0 77.1 77.3 78.0 79.9 79.2 79.2 79.5 79.5 80.2GE 1500i 67.1 70.6 75.2 77.6 77.8 78.3 79.0 79.7 81.9 82.1 82.3 82.3 82.6 8 7.6 83.3GE 120U5 68.7 72.3 76.8 79.2 79.7 80.2 80.9 81.9 80.5 80.7 85.0 85.0 85.2 85.2 85.9

GE boS 69.9 73.5 78:0 80.0 81.0 81.9 82.6 83:5 86:2 86:80 86:6 86.6 86.9 86.9 87.6GE 9005 760. 70.5 79.0 81.0 82,6 81.1 83.8 85.0 87 6 87.8 88.1 88.1 88.3 8.3 89.0GE 8001 70.6 70.7 79.2 61.6 82.8 83.3 80.0 85.2 08.1 88.3 88.5 88.5 88.8 88.8 89.5GE 7001 71.8 75.9 81.1 80.0 85.2 85.7 86.0 87.6 q0.5 90.7 90.9 90.9 91.2 91.2 91.9GE 6001 72.6 76.6 81.9 85.2 86.0 86.9 87.6 09.0 92.04 92.6 93.1 93.1 93.3 93.3 90.0

GE Sol 72.6 76.6 81.9 8s.% 86.6 87.1 8?.8 89.3 92.6 92.8 93.3 93.3 93.8 93.8 90.5GE 900 72.6 76.6 81.9 86.2 87.0 87.8 88.5 90.0 43.3 91.6 90.0 90.0 90.5 90.5 95.2GE 3005 72.6 76.6 81.9 86.2 87.0 87.8 89.0 90.9 90.3 90.7 9S.2 95.2 96.2 96.2 97.1GE 2001 72.6 76.6 81.9 86.2 87.04 87.8 89.0 90.9 910.5 95.! 95.7 95.9 96.9 96.9 98.1GE 1005 72.6 76.6 81.9 86.2 87.0 87.8 89.0 90.9 90.7 90.2 95.9 96.2 97.9 97.9 100.0

GE Cl 72.6 76.6 81.9 86.2 87.01 87.8 89.0 9C.9 90.7 95.2 95,9 96.2 97.9 97.9 100.0.................................................................................................................................................

TOTAL NLMBER Of OBSERVATIONS: 919

Jo2.

GLOBAL CLINATOLOGT BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FRM HOURLY OBSERVATIONS

AI1 UEATHER SERVICEIRAC

STATION NUMBER: 035623 STATION NANE: RAF ALCONBURY UNITED M1INGOON PERIOD OF RECORD: 78-67NONT4: JAN '"OURSILST): 0302-0500

CEIL1NG VZSIBILITY IN HUNDREDS OF METE;;IN 1 G GE GE GE GE GE GE GE GE GE GE GE

FEET 1 160 90 80 60 NB NO 32 24 20 16 12 10 8 5 a 0

NO CEIL I 29.5 30.3 32.5 33.3 33.4 33.7 33.8 34.0 34.2 34.N 34.N 34.4 T4.4 34.5 34.6

GE 200001 31.9 33.0 35.3 36.2 36.4 36.6 36.8 36.9 37.2 37.3 37.3 37.3 37.3 37.4 37.6GE 180001 32.1 33.2 3S.4 36.41 36.5 36.8 36.9 37.0 37.3 37.4 37.4 37.4 37.4 37.6 37.7GE 160003 32.1 33.2 35. 36.4 36.5 36.8 36.9 37.0 37.3 37.4 37.4 37.41 37.4 37.6 37.7GE 110001 32.1 33.2 35.4 36.4 36.S 36.8 36.9 37.0 37.3 37.4 37.4 37.,4 37.4 37.6 37.7GE 1200O 32.1 33.2 31.4 36.4 36.5 36.8 36.9 37.0 37.3 37.4 37.4 37.4 37.4 37.6 37.7

GE 100001 33.0 3#.1 36.6 37.6 37.7 38 .0 38.1 38.3 38.0 38.7 387 38.7 38.7 38.8 38.9GE 9060 33.41 34.5 37.0 38.0 36.1 38.46 38.5 38.7 38.9 39.1 39.1 39.1 39.1 39.2 39.3GE 80G0 35.7 36.9 40.0 l1.3 41.5 42.1 92.3 4Z.4 42.7 4Z.8 42.8 42.8 42.8 43.0 43.1GE ?000 16:0 37.2 40.7 42:0 42.1 43.1 43.2 %3.4 43.6 43.8 43.8 43.8 43.8 43.9 44.0

C GE 6100 36.1 373 ,0.8 42.1 42.3 43.2 43. 4 43.5 43.8 43.9 i3.9 43.9 43.9 44.0 44.2

GE 50U0 37.7 38.9 42.8 44.6 44.7 45.8 45.9 46.0 46..3 46.4 N6.4 46.4 46.4 46.6 6.T7GE 45o3 !8.8 40.3 44.6 46.7 41.o 48.2 48.3 48.5 8.7 48.9 48.9 48.9 48.9 49.0 49.1GE 40UO 42.7 44.4 469.0 51.1 51.4 52.6 52.8 52.9 53.2 53.3 53.3 53.3 53.3 53.4 53.6GE 3SGO 4S.S 47.2 52.6 54.8 55.0 $6.5 56.9 57.0 57.3 57.4 1.4 17.4 57.4 57.6 57.7GE 30U0 99.7 51.8 S7. 19.9 60.5 62.1 62.6 62.7 63.0 63.1 63.1 63.1 63.1 63.2 63.4

GE 25001 54.1 56.2 62.1 64.8 65.5 67.2 67.7 67.8 68.2 60.3 68.3 68.3 68.3 60.5 68.6GE 20001 56.9 59.1 66.03 69.1 69.9 71.7 72.2 72.3 73.2 73.3 73.3 73.3 73.3 7 .4 73.6GE 18001 56.9 59.1 66.0 69.4 70.2 71.9 72.5 72.6 73.4 73.6 73.6 73.6 73.6 7 .7 73.8GE 1500 59.9 62.8 69.9 73.4 74.2 76.1 77.0 77.2 78.5 79.7 78.7 78.7 78.7 79.8 78.9

* GE 12U0 60.8 6.00 71.5 75.0 75.8 77.9 78.9 79.5 60.8 81.1 81.1 81.1 41.1 81.2 01.3

GE 10001 63.0 66.3 74.1 77:6 78.4 8007 81.7 82.4 83.8 84.0 84.0 8.0 44.:2 84.3 84:4C GE 90D3 63.5 67.2 75.0 78.5 79.1 81.9 83.1 83.8 81.1 81.4 85.4 85.9 81.1 85.6 81.8

GE 800 64.2 68.1 75.8 79.5 8L.4 83.0 84.3 85.0 86.3 66.b 86.6 86.6 86.7 86.8 87.0GE 7003 65.4 69.3 77:0 80.7 81.6 84.4 85.9 86.6 87.9 88.2 88.2 88.3 88.1 88.6 88.7

(" GE 6003 65.4 69.4 77.6 81.7 82.7 81.6 87.2 87.9 89.3 89.1 89.5 89.7 89.8 89.9 90.1

GE 5003 61.5 69.5 78.0 82.3 83.4 86.3 87 9 88.9 910 91.3 91.3 91.4 91.5 91.7 918GE 4003 65.5 69.5 78.0 82.3 83.6 87.0 88.6 89.9 92.6 97.9 92.9 93.0 93.2 91.3 93.4GE @ool 65.5 69.5 78.0 82.8 83.3 87.8 89.8 91.1 93.8 94.1 94.9 93.6 95.0 95.2 95.4GE 2011 65.5 69.5 78.0 82.6 84.3 87.8 89.8 91.1 k 93.8 94.1 94.1 94.8 91.3 95.4 96.6

GE 0f00l 65.5 69.5 78.0 82.8 84.3 87.8 89.8 91.1 94.1 94.4 94.9 95.3 96.1 96.5 99.6

GE 03 6.1 69.5 76.0 82.8 84.3 87.8 89.8 91.1 94.1 94.5 95.0 91.6 96.4 96.8 100.0

TOTAL NUMSER Of OBSERVATIONS: 745

J.

-J

GLOBAL CLIMITOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HJOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-8?

MONTH: JAN VOURSiLSTI: 0601-0800.... ... .... ... .... . ?.... ... .... ... .... ... .... ... .... ... .... ... .... ... .... ... .... ... ....... .... ...

CEILING VISIBILITY IN HUNDREDS OF METERSIN I G GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 1 160 90 80 60 8 60 32 24 20 16 12 10 a S 0. . . ....................... ..... 6 .............

NO CElL I 28.8 29.B 30.5 31.6 31.7 31.7 32.6 3Z.9 33.4 33.4 33.4 33.4 73.5 33.9 34.6

GE 20CO01 32.0 33.3 36.0 35.1 35.2 35.2 36.1 36.5 37.0 37.0 37.0 37.0 37.2 37.6 38.0

GE 1:000 !2.1 33. 36.3 35.6 35.5 35.5 36.3 36.7 37.2 37.2 37.2 37.2 37.4 37.8 38.3GE 160001 32.1 33.4 31.3 35.6 35.5 35.5 36.3 36.7 37.2 37.2 37.2 37.2 37.6 37.8 38.3GE 1490G0O !Z.1 33.4 3943 35.4 35.5 35.5 36.3 36.7 37.2 37.2 37.2 37.2 37.4 37.8 38.3GE 120001 32.1 33.6 36.6 35.5 35.6 35.6 36.5 36.8 37.3 37.3 37.3 37.3 37.6 37.9 38.4

GE 100001 33.9 3S.2 36.3 37.6 37.6 37.6 38.5 38.9 39.4 39.6 39.6 39.6 39.6 60.0 40.5GE 90001 34.3 35.6 36.7 37.8 37.9 37.9 38.9 39.3 39.8 39.8 39.8 39.8 40.0 60.6 60.9GE 80001 36.1 37.6 38.8 60.1 60.5 60. 61.5 .o8 42.3 42.3 42.3 62.3 62.6 62.9 6 3.61

GE 7V001 36.3 37.8 39.0 400.6 607 40* 61.7 4 2:1 42:6 62.6 626 62.6 42.8 6 3.2 43:7

GE 60001 !6.3 37.8 39.0 60.6 60.7 .0.7 6.47 62.1 62.7 62.7 62.7 62.7 62.9 63.3 63.8

GE 50001 37.3 38.8 60.5 62.1 62.6 62.8 6 3.8 6.1 66.9 6614.9 661.9 6614.9 65.1 4 7.5 66.0[GE %501 38.9 0.6 612.7 661.6 46.8 65.5 616.5 6.8 67.6 67.6 67.6 67.6 67.8 663.2 68.7

GE 60001 61.5 63.3 66.2 68.5 4689 49.8 51.0 51.3 52.2 52.2 52.2 52.2 52.6 52.9 53.6GE 35001 63.0 65.2 48.7 51.5 51.8 52.9 56.1 56.5 S5.4 55.6 55.6 55.6 55.6 S6.1 56.6

GE 30001 47.1 69.8 53.9 56.8 57.6 58.9 60.1 60.6 61.7 63.7 61.7 61.7 62.0 62.6 63.0

GE 2SUOj 50.7 53.7 57.9 61.0 61.7 63.0 64. 64.9 66.0 66.0 66.0 66.0 66.2 66.8 b7.6GE 20001 56.9 58.3 62.7 65.9 66.7 68.3 69.6 70.6 71.6 71.6 71.6 71.6 71.8 72.4 73.0

GE Ioul SS.2 58.8 63.3 66.5 67.0 69.1 7a.6 71.3 72.7 72.7 72.7 72.7 72.9 73.5 76.1GE SO01 57.3 61.3 66.3 69.9 70.9 72.7 74. 75.4 76.7 76.7 76.7 76.7 77.0 77.6 78.2GE 12001 59.1 63.61 68.7 72.2 73.2 75.2 77.3 78.2 79.5 755 79.5 79.s 79.8 80.6 81.0

GE 10001 60.6 65.1 71.0 76.5 75.5 77.7 79.5 80.7 82.1 62.1 82.1 82.1 82.3 83.0 83.8

GE 9go 61.1 65.9 72.0 75.7 76.8 79.1 81.0 82.2 83.5 83.5 83.5 83.5 83.8 86.5 85.2

GE 8001 62.0 66.6 72.9 76.8 78.0 80.4 82.3 83.7 65.1 85.1 85.1 85.1 e5.6 86.1 86.8GE 7001 62.7 67.9 76.1 78.2 79.6 82.2 84. 86.0 87.7 87.7 87.7 87.7 88.0 88.8 89.5GE 6031 62.8 68.2 7.6 78.8 80.0 82.9 85.2 87.0 86.7 88.8 88.9 880.9 89.3 90.0 90.7

GE SGO 62.8 68.2 79.9 79.1 80.4 83.6 86.3 88.0 89.9 901 90.5 90:5 91.0 91.7 92:4GE 600| 2.8 68.2 7.9 79.1 80.6 84*3 87.'. 4 9*3 91.8 92.1 92.6 92.4 92.9 93.7 9.5GE 3001 62.8 68.2 74.9 79.3 80.9 86.5 87.1 69.6 92.4 92.9 93.9 96.0 96.6 95.6 96.3

GE 2001 62.8 68.2 74.9 79.6 81.0 86l.6 870.8 89.8 92.6 93.0 96.6 94.5 95.2 96.1 97.36G 10,01 62.8 68.2 74.9 79.61 81.0 86.6 67.9 89.9 92.7 93.3 96.8 96.9 96.2 97.6 100.0

GE 31 62.8 68.2 74.9 79.4 81.0 864.6 87.9 89.9 92.7 93.3 94.8 94.9 96.2 97.6 130.0

............................................................................................................................

TOTAL NUMBER OF OBSERVATIONSt 820

--4I.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

USAFETA C FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURy UNITED KINGOOM PERIOD Of RECORD: 78-87MONTH: JAN HOURSILSTI: 09C:-1100

................................. ...............................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I G6 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 AD 60 N8 40 32 24 20 16 12 10 a 5 4 0

NO CEIL I 26.1 27.1 28. 29.6 29.8 29.8 30.3 30.6 30.8 3i1.8 30.8 30.8 3J.9 30.8 31.4

GE 2000..l 31.2 32.9 34.6 36.0 36.2 36.3 37.1 37.5 37.7 37.7 37.7 37.8 37.8 37.8 38.4GE 180001 31.4 33.2 34.8 36.2 36.4 36.6 37.4 37.7 36.0 38.0 38.0 38.1 38.1 39.1 38.6GE 160001 !1.4 33.2 34.8 36.2 36.4 36.6 37.4 37.7 38.0 38.0 38.0 38.1 381 39.1 38.6

GE I41001 31.7 33.4 35,. 36.4 36.7 36.8 37.6 3A:0 3A:2 38.2 38:2 38.:3 TA.3 313 3.9

GE 120001 !2.5 3N.Z 35.9 31.3 37.5 37.6 384 38.a 39.0 39.0 39.0 39.1 39.1 3.1 39.7

GE 100001 34.:2 36.0 37.0 39.5 39.0 40.0 40.9 41.2 '41.4 41.4 4 1.4 41.6 41.b 41.6 42.1GE 9(001 35.0 36.9 36.8 O.4 40.7 NI .0 N1.8 42.1 42.4 42.4 42.4 42.5 42.5 4 2,S 43.1

GE 80001 3B.4 NO.5 43.1 NN.* 45;3 45.5 46.3 46.7 46.9 46.9 86.9 47.0 47.0 47.0 47.6

GE 7rool 38.8 40.9 N3.N 4S.2 N5.6 45.9 6.8 47.1 4T.4 47.4 47.4 47.5 47.5 47.5 48.1GE 613001 38.8 %O*9 43.N N5.2 4S.6 N5.9 4..8 47.1 47.4 147.4 47?.T4 47.5 47.5 47.5 48.2

GE 5o00 a9.0 N2.0 4.9 N6.8 47.4 .0 N91 49:S 9 97 197 49.7 4.8 9.A 49.A 50.5

GE 145001 41.7 4.0 4.,0 49.2 50.1 50.9 52.0 52.4 52.7 52.7 52.7 5Z.9 52.9 52,9 53.6GE 40001 46.3 48.9 52.5 54.8 55.6 56.6 57-9 58.3 58.9 59.1 59.1 59.4 59.5 59.6 63.3

GE 35001 48.0 50.8 54.5 56.9 57;7 58.9 60.5 61.0 61.9 62.2 62.2 62.5 62.6 62.7 63.4

GE 30001 50.8 53.7 57.9 60.3 61.2 62.4 64.3 6*4.5 65.4 65.7 65.7 66.0 66.1 66.2 66.9

GE 25001 52.6 56.1 60.3 630.0 64.1 65.8 67.5 68.3 69.5 69.7 69.7 70.1 70.2 7 .3 71.0IE 2C001 56.5 60.3 64.7 67.5 68.9 71.1 73.0 73.8 75.0 75.2 75.2 75.7 75.8 75.9 76.6GE 18001 56.9 60.8 65.3 68.2 69.6 72.1 ?1.0 75.1 76.4i 76.6 76.6 77.1 77.2 77.3 78.0GE 15001 58.1 62.0 66.7 69.7 71.2 74.3 76.4 77.4 78.8 79.0 79.0 79.5 ?9.6 79.7 80.6

GE 12001 59.3 63.4 68.5 71.9 73.8 77.2 79.4 80.6 82.1 82.3 82.3 82.8 82.9 83.0 A3.8

GE 11001 59.7 64.0 69.5 73.2 75.1 7B.6 81.1 62.4 84.2 84.4 84.4 84.9 85.0 81.1 85.9

GE 9001 60.0 64.4 69.8 73.8 75.7 79.2 81.7 83.0 84.7 85.0 85.0 8S.4 85.6 85.7 86.5

or 9001 60.3 64.7 70.2 74.2 76.1 79.7 82.4 83.9 85.7 Bs.9 85.9 86.4 86.5 86.6 87.4GE 7001 61.1 65.5 71.2 75.2 77.2 80.8 83.5 85.1 87.3 87.5 87.8 88.4 88.6 8 4.7 89.5GE 6001 81.1 6S.7 71.7 76.0 78.1 82.1 84.7 86.5 88.7 88.9 89.2 89.8 90.0 9 .1 90.9

GE 51;01 61.2 65.8 71.8 76.4 78.6 83.0 86.1 87.9 90.2 9r.7 91.2 91.7 92.1 92.2 93.0

GE 11001 61.2 65.8 71.8 76.4 78.6 83.2 86.5 88.5 91.4 92.1 92.7 93.2 93.6 93.7 94.5

GE 301 61.2 65.8 71.8 76.4 78.7 83.5 86.7 88.7 91.6 92.8 93.8 94.S 95.2 9S.3 96.5

GE 201 61.2 65.8 71.8 76.4 78.7 83.5 86.7 88.7 91.6 92.8 93.6 94.9 96.3 96.5 98.1

GE 100l 61.2 65.8 71.8 76.4 78.7 83.5 86.7 88.7 91.6 92.8 93.8 94.9 96.4 97.4 IC0.0

GE 01 61.2 65.8 71.8 76.4 78.7 83.5 867 88.7 91.6 92.8 93.8 94.9 96.4 97,4 100.0

................................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS: 859-'

.. .m4~il m imI i n m m l l I I I Im m

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFE7AC FROM POUqLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: JAN HOURS(LST): 1203-1400

CEILING VISIBILITY IN HUNDREDS OF METERS

IN I G1 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 48 NO 32 24 20 16 12 10 8 5 4 0

.... ... .... ... .e ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NO CEIL i 26.4 26.4 27.7 28.3 285 28.9 29.1 29.1 29.2 29.2 29.2 29.2 29.2 29.2 29.5

GE 200001 32.3 323 34.3 34.9 35.2 35.7 35.9 35.9 36.0 36.1 36.2 36.2 76.3 36.3 36.6GE 8IOGri1 32.6 32.6 34.5 35.1 35.4 36.0 36.1 36.1 36.2 36.3 36.4 36.4 36.5 36.5 36.8GE 160001 32.6 32.6 34.5 35.1 35.4 36.0 36. 1 36.1 36.2 36.3 36.4 36.4 36.5 36.5 36.8bE 1400r, 22.7 32.7 34.6 35.2 35.5 36.1 36.2 36.2 36.3 36.4 36.5 36.5 36.6 36.6 37.0GE 120001 33.6 33.7 35.6 36.2 36.5 37.1 37.'2 37.2 37.3 37.4 37.5 37.5 37.6 37.6 37.9

GE 100001 35.5 36.0 38.2 39.0 39.4 39.9 0o"o 40.0 40.1 40.2 40.4 40.4 40.5 4 .5 40.8GE 90001 35.9 36.4 38.7 39.6 4D .1 40.7 40.8 40.8 40.9 41.0 41.1 41.1 4t1.2 41.2 41.6

GE 80n00 40.6 41.6 44.7 45.8 46.5 47.1 47.3 47.3 47.5 47.6 47.7 47.7 47.8 47.8 48.1GE 70001 40.9 41.9 4S.1 46.2 46.,8 47.5 47.6 47.6 47.8 47.9 48.0 48.0 48.1 49.1 48.5

GE 6V00l 41.1 42.1 45.4 46.5 47.1 47.8 47.9 47.9 48.1 48.2 48.4 48.4 48.5 498.5 48.8

GE 50001 42.0 43.1 46.9 48.2 49.0 49.7 49.8 49o8 50.0 50.2 50.3 50.3 50.4 5 0.4 5C.8GE 4S00i 42.5 43.6 47.6 48.9 49.8 50O.8 50.9 50.9 51.3 51.6 S1.9 51.9 52.0 57.0 52.3GE 40001 46.2 47.6 51.9 53.7 54.9 56.0 56.4 56.4 56.9 57.5 57.8 57.8 57.9 57.9 58.2GE 35001 48.2 49.7 54.1 56.0 57.3 58.8 59.2 59.2 59o8 60.3 60.6 60.6 60.7 60.7 61.1GE 30001 51.8 S3.4 58.1 60.3 62.0 63.5 64.3 64.3 64.8 65.4 65.7 65.7 65.8 6 ".8 66.1

GE 25U01 54.1 56.1 61.1 63.5 65.5 67.8 69.0 69.1 69.7 70.4 70.7 70.8 70.9 70.9 71.3

GE 20001 57.3 59.9 64.9 67.5 69.7 72.1 73.4 73.6 74.2 74.9 75.2 75.3 75.4 7 5.4 75.8GE 18GI 58.1 60.6 65.7 68.3 7G.5 72.9 74.1 74.3 75.0 75.7 76.0 76.1 76.2 76.2 76.5

GE ISngOl 60.2 62.9 68.2 71.3 74.0 76.6 77.9 78.2 78."8 79.5 79.8 79.9 80.0 80.0 80.4* GE 12001 62.0 65.U 70.4 74.0 76.9 79.7 80.9 81.3 41.9 82.6 82.9 83.0 83.1 83.1 8 3.4

GE 10001 63.0 66.2 71.7 75.4 78.4 81.3 82.8 83.4 84.9 85.5 85.9 86.0 86.1 86.1 86.4

GE 9001 63.8 67.1 72.6 76.3 79;.3 82.1 83.8 84.5 86.0 86.6 87.0 87.1 87.2 8 7.2 87.5GE 8001 64.l 67.5 73.2 77.2 80.2 83.1 84.8 85.9 87.5 88.2 88.5 88.6 88.7 89.7 89.0GE 7U31 64.6 68.4 74.6 78.7 81.9 85.0 86.8 87.9 90.0- 90.7 91.0 91.1 91.2 91.2 91.6

GE 6001 64.7 68.5 75.0 79.6 82.9 86.1 88.0 89.1 91.2 91.9 92.z 92.3 92.4 92.4 92.8

GE sOul 64.7 68.5 75.3 79.9 83.2 86.8 89.1 90.5 93.0 93.6 94.1 94.2 94.3 94.3 94.6GE 4001 64.7 68.6 75.4 81.2 83.4 87.4 89.8 91.1 93.8 94.4 95.0 95.1 95.2 95.2 95.5GE 300I 64.7 68.6 75.4 80.2 83.4 87.4 90.0 91.6 94.4 95.5 96.2 96.5 97.4 97.4 98.CGE 2001 64.7 68.6 75.4 80.2 83.4 87.4 90.3 91.6 94.4 95.5 96.2 96.5 98.0 9 .4 99.8GE 1001 64.7 68.6 75.4 80.2 83.4 87.4 90.0 91.6 94.4 95.5 96.2 96.5 98.0 98.5 100.0

GE 01 64.7 68.6 75.4 80.2 83.4 87.4 90.0 91.6 94.4 95.5 96.2 96.5 98.0 9A.5 100.0


/

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED K-NGOOM PERIOD OF RECORD: 78-87MONTH: JAN HOURSILSTI: 150r-170

C) ~ ~~~~~~~~~ ~~~ ~ .......................... .......... .......... ...... .....ge . t.......0 ........

CEILING VISIBILITY IN HUNDREDS OF METERSIN i G7 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

0 FEET i 160 90 80 60 48 4Q 32 24 20 16 12 10 a 5 4 0

lo NO CE L 2 26.2 2S.2 27.3 27*7 7 28.9 29.4 29.4 29.5 29.S 29.6 29.6 29.7 29.7 29.9

GE 20COU0 29.8 31. 34.0 34:5 34.9 36.1 36.9 36.9 37.2 37.2 37.3 37.3 37.4 37.4 37.60 GE 180009 2908 31.4 34.0 34.5 34.9 36.1 36.9 36.9 37.2 37.2 37.3 37.3 37.4 37.4 37.6

GE 160001 29.8 31.4 34.0 34.5 34.9 36.1 36.9 36.9 37.2 37.2 37.3 37.3 31.4 37.4 37.6GE 140001 30.1 31.6 34.2 34.8 35.1 36.3 37.2 37.2 37'.4 37.4 37.5 37.5 37.6 37.6 37.8

I GE 120001 30.8 32.3 35.0 35.5 35.8 37.0 37.9 37.9 38.1 38.1 38.3 38.3 38.4 39.4 38.6

GE 100001 33.1 34.8 37.6 38.4 38.7 40.0 40.9 40.9 41.1 41.1 41.2 41.2 41.3 41.3 41.5o GE 90001 33.7 35.5 38.6 39.3 39.8 41.1 42.0 42.0 42.2 42.2 42.3 42.3 42.4 42.4 42.6GE 80001 37.4 39.2 43.0 43.9 4 4.'s 46.0 47.0 47.0 47.2 47.2 47.3 47.3 47.4 47.4 47.7GE 70001 37;9 39.8 43.7 44.7 45;4 47.0 48.2 48.2 48.5 48.5 48.6 48.6 48.7 48.7 49.2GE 60001 38.1 40.1 44.3 45.2 45.9 47.5 48.7 %8.7 49.1 49.1 49.2 49.2 49.3 4.3 49.5

GE 50001 39.2 41.4 45.8 46.8 47.4 49.4 50.6 50.6 50.9 50O.9 51.0 51.0 S 1. 1 51.1 51.4GE 45001 40.8 43.1 47.5 48.5 49.2 51.4 52.6 5Z.6 52.9 52.9 53.1 53.1 53.2 53.2 53.4GE 40001 44.0 46.7 51.5 52.5 53.2 55.5 56.9 57.0 57.5 57.5 58.0 58.0 58.1 5S.1 58.5GE 35001 46.3 49.3 54.2 55.7 56.5 59.0 60.5 60.9 61.4 61.4 62.0 62.0 62.1 62.1 62.4GE 30001 50.2 53.4 58.8 60.7 61.4 64.0 65.8 66.4 67.1 67.1 67.7 67.7 67.8 67.8 68.1

GE 25001 54.4 58.0 63.9 65.9 66.9 69.5 71.7 72.5 73.3 73.3 73.9 73.9 74.0 74.0 74.3GE 20001 57.'0 61.0 67.3 69.7 70.8 73.9 76.1 76.9 78.1 78.3 78.8 78.8 78.9 78.9 79.2GE 18001 57.2 61.1 67.4 69.8 71.0 74 .1 76.3 77.2 78.4 78.5 79.0 79.0 79.1 79.1 79.5GE ISO0 58.7 63.1 70.1 73.2 74.5 77.9 80.3 81.41 83.0 83.1 83.6 83.6 83.7 81.7 84.06E 12001 59.5 63.9 71.1 74.9 76.4 80.0 82.5 83.6 85.2 85.4 85.9 85.9 86.0 86.0 86.3

GE 10001 60.2 64.7 72.8 77.4 79:0 82:7 B5.4 86.9 :8.5 88.6 89:3 89.3 89.4 89.4 89:7GE 9009 60.7 65.1 73.4 78.0 79.7 83.4 860 87.5 89.2 89.3 89.9 89.9 90. 9.1 90.4GE 8001 61.2 66.2 74.9 79.6 81.2 8e4.9 87.5 89.1 90g.8 90.9 91.6 91.6 91.7 91.7 92.0GE 7001 61.5 66.6 75.2 80.3 82.0 85.9 88.5 90.1 91.8 91.9 92.7 92.7 92.8 92.8 93.1GE 6001 61.5 66.6 75.3 81.0 82.6 86.9 89.6 91.1 92.9 93.0 94.0 94.0 94.1 94.1 94.4

GE 5009 61.5 66:7 75.6 81.3 83.0 87.2 89.9 91.6 93.3 93.4 94.4 914.4 94.6 94.6 9S.0GE 4130 61.6 66.9 75.8 81.6 83.3 87.9 90.6 92.2 94.0 94.1 95.3 95.3 95.5 95.5 95.8GE 3001 61.6 66.9 75.8 81.6 83.3 88.0 90.7 92.3 94.4 94.8 96.0 96.1 96.6 96.7 97.6GE 2001 61.6 66.9 75.8 81.6 83.3 88.0 90.8 92.5 94.5 95.0 96.3 96.5 97.7 97.8 99.6GE 1001 61.6 66.9 75.8 81.6 83.3 88.0 90.8 92.5 94.5 95.0 96.3 96.5 07.9 9S.1 99.9

GE ol 61.6 66.9 75.8 81.6 83.3 88.0 90.8 92.5 94.5 95.0 96.3 96.5 97.9 98.1 100.0..... .......................................................................................................................


0

,.j

WI'- Im m


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORO: 78-87MONTI-: JAN HOURSILSTI: 1800-200.. ... .... .... ... .. .... .... ...... .... .... ... ... ... .... ... ... .......... ..... .....

CEILING VISIBILITY IN HUNDREDS OF METERSIN I G1 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 4O 32 24 20 16 12 10 8 5 4 0.. .. . .. . .. . .. , . . o .. . . . . . . .. ... o ... o ... . . .. . . ..............................

0 NO CEIL I 26.4 28.1 29.5 30.4 30.6 31.2 31.7 32.1 32.2 32.2 32.4 32.S 32.6 32.6 32.8

GE 200001 30.7 32.5 34.9 35.8 35.9 36.8 37.3 37.7 38.1 38.1 382 38.4 38.5 38.5 38.6GE 180001 30.8 32.6 35.0 35.9 36.0 36.9 37.5 37.8 36.2 38.2 38.4 38.5 38.6 38.6 38.8GE 160001 30.8 32.6 35.1U 35.9 36.0 36.9 37.5 37.8 38.2 38.2 38.4 38.5 38.6 38.6 38.8GE 1140UO1 30.8 32.6 35.0 35.9 36.0 36.9 37.5 37.8 38.2 38.2 38.4 38.5 38.6 38.6 38.8G 120001 30.8 32.6 35.0 35.9 36.0 36.9 37.5 37.8 38.z 38.2 38.4 38.5 38.6 38.6 38.8

GE 100001 !2.5 34.3 36.8 37.7 37.8 38.8 39.3 39.7 40.1 40.1 40.2 40.3 40.4 43.4 40.6C GE 90001 33.0 35.1 37.8 38.8 38.9 39.8 40.3 40.7 41.1 41.1 41.2 41.41 41. 41.1 41.6

GE 80001 37.3 39.7 42.7 43.8 44.2 45.1 45.6 46.0 46.7 146.7 46.8 46.9 47.1 47.1 47.2GE 70001 37.8 40.3 43.3 414.5 44.9 45.9 46.7 47.1 47.7 47.7 47.9 48.0 48.1 48.1 48.2o GE 60001 38.0 40.41 43.4 44.6 45.0 46.2 46.9 47.3 48.0 48.0 48.1 q8.2 48.4 48.4 48.5

GE 50001 39.8 42.3 46.0 47.2 47.7 48.9 49.7 50.1 50.,7 50.7 50.8 51.0 51.1 51.1 51.2GE 45001 41.6 44.1 48.0 49.2 49.7 51.0 51.8 52.1 52.8 52.8 52.9 531 53.2 53.2 53.3GE 40001 45.5 48.1 52.8 54.0 54.7 56.3 57.'1 57.6 58.3 58.3 58.4 58.5 58.6 38.6 58.8GE 35001 48.8 51.5 56.7 57.9 58.6 60.2 61.4 62.0 62.7 62.7 62.8 62.9 63.1 63.1 63.2GE 30001 52.7 56.0 61.9 63.3 64.4 65.9 67.4 68.0 68.7 68.8 68.9 69.1 69.2 69.2 69.3

GE 25001 55.8 59.8 66.6 68.5 69.6 71.3 73.S 74.4 75.0 75.2 75.3 75.4 75.6 75.6 75.7GE 2COol 57.7 62.4 69.3 .71.4 72.7 74.5 76.7 77.6 78.3 78.4 78.5 78.7 78.8 78.8 78.9GE 18001 57.9 62.5 69.4 71.7 73.0 74.8 77.0 77.9 78..5 78.7 78.8 78.9 79.1 79.1 79.2GE 15001 61.0 65.8 73.3 76.5 T7.B 79.8' 82;2 83.1 83.7 83.9 84.0 84.1 84.3 84.3 84.4

O GE 12001 61.9 67.1 74.8 78.2 79.5 81.8 84.3 85.2 85.8 86.0 86.1 86.2 86.3 86.3 86.5

GE 11001 62.3 67.5 T5.8 79.6 80.9 83.4 86.3 87.6 88.4 88.6 88.7 88.8 88.9 88.9 89.1GE 9oo 62.7 68.3 76.7 80.5 81.8 84.3 87.3 88.6 89.5 89.6 89.9 90.1 93.2 9C.2 90.4GE 8001 63.1 69.4 76.2 81.9 83.2 85.7 88.7 90.0 90.9 91.0 91.3 91.5 91.8 91.8 91.9GE 700| 63.2 69.7 78.8 82.7 84;0 86.5 89.7 91.0 ';1.9 92ol 92.3 92.6 92.8 92.8 93.0BC GE 6001 63.2 69.7 788 83.4 846.8 87.5 91.0 92.3 93.2 93.5 93.8 94.1 94.4 94.4 94.5

GE 5001 63.2 69.7 78.8 83.5S 84.9 87.6 91.2 92.6 93.5 93.8 94.0 94.4 94.7 94.7 94.8GE 4lQ0 63.2 69.7 78.9 84.0 85.4 88.2 91.8 93.5 44.4 94.7 95.1 95.4 95.7 95.7 9S.8GE 3001 63.2 69.7 78.9 84.1 85.6 88.6 92.3 94.0 95.2 95.3 95.7 96.1 96.5 96.5 97.3GE 2001 63.2 69.7 78.9 684.3 85.7 88.7 92.6 94.3 95.6 96.1 96.6 97.0 97.5 97.7 99.0GE 1001 63.2 69.7 78.9 84.3 85.7 88.7 92.6 94.3 95.6 96.1 96.6 97.0 97.9 98.2 99.6

GE Ol 63.2 69.7 78.9 84.3 85.7 88.7 92.6 94.3 95.6 96.1 96.6 97.0 97.9 98.2 100.0

........................................ oo .....................................................................................................


* L.


STATION NUMBER: 035623 STATION NAE: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-B7MONTH: JAN HOURSILSTI: 2100-2300

...... ...... ...... .... !... . . . . . . .. . . . . . ....... ; .. • • 0 0" .... .. .. .. .. .. .. .. .. .. .. . ... ... .. ... ..

CEILING VISIBILITY IN HUNDREDS OF METERSIN i 01 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEo FEET I 160 90 80 60 8 40 32 2 20 16 12 10 8 5 4 0

............................................ .......................................... ot ...................................................

NO CEIL 1 30.8 31.6 32.8 33.1 33.2 33.9 34.S 34.8 35.3 35.5 35.5 35.6 35.7 36.3 36.7

GE ZOOOO! 33.9 35.3 36.8 37.1 37.2 38.2 38.8 39.1 39.6 39.8 39.8 39.9 40.0 40:6 41.0E G 16000 34 1 35.6 37.1 37.3 37.5 38.4 39.1 39.4 39"9 40.0 40.0 40.2 40.3 40.8 41.2

GE 16C01 34.3 35.7 37.2 37.5 37;6 38.6 39.2 39.5 40.0 40.2 40.2 40.3 40.4 41.0 41.4GE 140001 34.3 35.7 37.2 37.5 37.6 38.6 39.2 39.5 40.0 40.2 40.2 40.3 40.4 41.0 41.4GE IZOOO 34.3 35.7 37.2 37.5 37.6 38.6 39.2 39.5 40.0 R0.2 40.2 40.3 40.4 41.0 41.R

GE 100001 35.1 36.5 38.2 38.6 38.7 39.6 40.3 40.6 41.1 41.2 41.2 41.4 41.5 42.0 42.4GE 90001 35.2 37.1 38.8 39,2 39.4 40.3 41.0 41.2 41.8 41.9 41.9 42.0 42.2 42.7 43.1GE 80001 37.9 39.9 41.9 42.7 42.8 43.8 44.7 45.0 45.5 45.6 45.6 45.8 45.9 46.5 46.9GE 70001 38.4 40.4 42.4 43.2 43.4 44.3 45.6 45.9 46.5 46.6 46.6 46.7 46.9 47.4 47.8GE 60001 38.8 40.8 42.8 43.6 43:8 44.7 46.1 46.3 46.9 47.0 47.0 47.1 47.3 47.8 48.2

GE 50o '40:4 42.6 45.2 46.3 46.5 47.7 49.1 49.4 49.9 50.1 50.1 50.2 50.3 5'.9 51:3GE 45005 41.4 1.5 46.2 47.4 4 7.5 48.9 50.3 50.6 51.1 51.3 51.3 51.4 51.5 52.1 52.5GE 40001 45.8 47.9 51.1 52.3 52.5 53.8 55.3 55.6 56.1 56.2 56o2 56.4 56.5 57.0 57.4GE 35001 50.7 53.1 56.8 58.0 58.1 59.6 61.2 61.4 62.0 62.1 62.1 62.2 62.4 62.9 63.3GE 30001 54.6 57.2 61.0 62.4 62;9 64.5 66.5 66.6 67.5 67.6 67.6 67.7 67.9 68.4 68.8

6E 25001 58.1 60.9 65.5 67.6 68:3 70.0 72.0 72:3 73.0 73.1 71.1 73:2 73.4 73.9 743GE 20001 61.0 64.1 68.7 71.6 72.3 74.2 76.2 76.4 77.1 77.2 77.2 77.4 77.5 74.0 78.4GE 18001 61.8 65.1 69.6 72.6 73;2 75.1 77.1 77o4 78.0 79.2 78.2 78.3 78.4 79.0 79.4GE 15005 63o7 66.9 72.2 75.4 76.2 78.4 80.5 80.7 81.5 81.7 81.8 81.9 82.1 82.6 83.0

C' GE 12O01 65.2 68.5 73.8 77.2 78.0 80.6 82.7 83.0 83.8 84.1 84.3 84.5 84.6 85.1 85.5

GE 10001 66.1 69.5 75.5 79.0 79.8 82.3 84.6 85.1 86.1 86.3 86.6 8607 86.9 8?.4 87.8GE 9001 67.1 70.5 76.8 80.3 81.1 83.7 85.9 86.6 87.7 88.0 88.2 88.4 88.5 89.0 89.4GE SOOJ 67.6 71.1 77.4 80.9 81.7 84.3 86.6 87.4 88.6 88.9 89.2 89.4 89.6 90.1 90.5GE 7005 68.4 71.9 78.7 82.5 83.5 86.2 88.8 89.6 90.8 91.0 91.3 91.6 9107 92.2 92.6GE 6005 68.4 71.9 79.0 82.9 80.1 86.9 89.4 90.2 91.4 91.7 92.1 92.5 92.8 93.3 94.0

GE 5005 68.4 71.9 79.0 82.9 84.1 86.9 89.7 90.6 91.8 92.1 92.5 92.9 93.2 91.7 94.4O GE 4005 68.4 71.9 79.0 83.1 84.6 87.6 90.5 91.4 92.8 93.0 93.4 93.8 94.1 94.6 9S.6

GE 3001 68.5 72.0 79.1 83.3 84.7 87.7 90.6 91.6 93.4 93.7 94.1 94.9 95.2 95.7 96.8GE 200l 68.5 72.0 79.1 833 84.7 87.7 90:8 92:1 94:1 94.5 95.Q 95.9 96.3 96.8 98.8

C) GE 1005 68.5 72.0 79.1 83.3 84.7 87.7 90.8 92.1 94.1 94.5 95.0 96.3 96.8 97.3 99.7

GE o 68.5 72.2 79.4 83.5 85.0 88.0 91.0 92.4 94.4 94.8 95.3 96.5 97.1 97.6 100.0.............................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS: 747-J

.4i

N/

wp"

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITVUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 76-87MONTH: JAN HOURS(LSTI: ALL

.......................................................... .....................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEo FEET 160 90 go 60 48 40 32 24 20 16 12 10 B 5 4 0.. ... ...0 ! . . ... . . 0 .. . . . . . . . . . . . . . . . . . . .. . .. . . .. ... . . .. . . .. . .. . . .. ... . . ....

o NO CElL 1 27.6 28.5 29.9 30.6 30.8 31.2 31.7 31.9 32.2 32.2 32.3 32.3 32.4 32.5 32.8

GE 20001 11.9 33.1 34.9 35.7 35.'9 36.5 37.0 37.2 37.6 37.6 37.7 37.7 3.6 3A.0 38.3GE 16gnT00 320 33.3 35.1 35.9 36.1 36.6 37.2 37.4 37.7 37.8 37.8 37.9 38.0 38.1 38.5GE 160001 32.0 33.3 35.1 35.9 36.1 36.6 37.2 37.4 37.7 37.8 37.8 37;9 38.0 39.1 38.5GE 140001 32.1 33.4 35.2 36.0 36.2 36.7 37.3 37.5 37.8 37.9 37.9 38.0 38.1 38.2 38.6GE 120001 32.5 33.8 35.6 36.4 36.6 37.1 37.7 37.9 38.2 38.3 38.3 38.4I 38.5 39.6 39.0

GE 100001 34.1 35.4 37.4 38.3 38.6 39.1 39.7 39.9 40o3 40.3 40.3 40.4 40.5 40.6 41.0GE 90001 34.5 36.0 38.1 39.0 39.3 39.9 40.4 40.6 41o0 41.0 41.1 41.1 41.3 41.4 41.7GE 80001 37.7 39.4 42.0 43.2 43.6 484.3 44.9 45.1 45*5 45.6 45.6 45.7 45.8 45.9 46.3GE 700 38.2 39.8 42.5 43.8 44.2 44.9 45.7 45.9 46.3 466.3 46.4 46.4 46.6 46.7 e 700GE 60001 38.3 40.0 42.8 464.0 44.4 45.1 45.9 46.1 46.5 46.6 46.6 46.7 46.8 46.9 47.3

GE 50001 39.6 41.4 44.6 46.0 46.5 47.4 48.2 46.4 846.9 48.9 49.0 49.0 49.2 49.3 49.7GE 45O01 410.9 42.8 46.2 47.7 48.2 49.4 50.2 50.4 50.9 51.0 51.1 51.1 51.2 51.3 51.7GE 40001 44.8 47.0 50.9 52.6 53.2 54.4 55.4 55.6 56.2 56.4 56.5 56.6 56.7 56.9 57.2GE 35001 47.5 49.8 54.1 55.9 56.6 58.0 59.1 59.4 60,1 6.2 60.4 60.5 60.6 60.8 61.1

( GE 3CO01 51.5 5 4. 2 58.8 60.9 61.8 63.3 64.6 65.0 65.7 65.8 66.0 66.1 66o2 66.0 66.8

GE 25001 54.6 57.6 62.8 65:1 66.1 67.9 69.4 69.9 70.8 70,9 71.1 71.2 71.3 71.5 71.9GE 2P00 57.8 61.2 66.6 69.3 70.4 72,5 7940 74.6 75.5 75.7 75.9 76.0 76.1 76.3 76.7GE 18001 58.2 61.6 67.1 69.8 71.0 73.1 74.7 75.3 76.3 76.5 76.6 7607 76.9 77.0 77.4GE 15001 60.2 64.0 69.0 73.0 74.3 76.6 78.4 79.1 60.3 8e.5 00.6 00.0 80.9 81.1 81.5

o GE 12001 61.5 65.5 71.5 75.0 76.4 79.0 80. 81.6 82.9 83.1 83.3 83.4 83.5 83.7 84.1

GE 10001 62.'6 66.6 73.1 76.6 70.3 81.0 83.0 84.1 F5.5 85.7 85.9 86.0 86.2 86.4 86.8SGE 9001 63.1 67.3 74.3 77.8 79.3 82.0 84.1 65.1 '6.6 86.6 87.1 87.2 87.3 87.5 68.0GE 8101 63.6 68.1 74.8 78.7 80.2 83.0 85.1 86.3 67.9 88.1 88.3 68.5 08.7 84.8 89.3GE 7001 64.3 68.9 75.9 79.9 81.6 84.5 86.7 88.0 89.7 69.9 90.2 90.4 90.6 9.e8 91.2o GE 6001 64.4 69.0 76.3 00.7 62.4 85.5 87.9 89.2 90.9 91.2 91.5 91.7 91.9 92.1 9..6

GE 5001 64.4 69.0 76.5 61.U 82.7 86.0 88.6 90.0 91.9 92.2 92.7 92.9 93.1 93.3 93.8I ( GE qUO 64.4 69.1 76.5 61.2 83.0 86.6 89.2 90.6 93.0 93.4 93.9 94.1 94.4 94.6 95.1

GE 3001 64.4 69.1 76.5 81.3 83.2 86.0 89.6 91.2 93.6 94.2 91.9 95.3 95.9 96.1 96.9GE 2001 64.4 69.1 76.5 01.4 63.2 86.8 69.7 91.4 93.6 94.5 95.3 95.7 96.7 97.0 98.5

* ) GE 1OO 64.4 69.1 76.5 61.4 83.2 86.8 89.7 91.4 93.9 94.6 95.4 95.9 97.1 97.7 99.9

GE O 64.4 69.1 76.6 81.14 63.3 66.9 89.8 91.4 93.9 94.6 95.5 96.0 97.2 97.6 100.0

............................................................................................................... .............. ........................


A.J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM 01OURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-79.82-87

MONTH: FEB HOURSILSI): 0000-02M0

CE ILING VISIBILITY IN HUNDREDS OF METERSIN S T GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

I0FE ET 1 160 90a 80 6 0 48 40 32 24 20 16 12 10 a 5 a4

oNO CEIL 1 2.4.6 25.6 28.8 29.8 31.8 34.1 35.1 35.3 35.8 36.3 36.8 37.1 37.1 37.1 37.6

GE 200001 25.8 27.1 30.8 32.1 3.4.1 36.3 37.3 17.6 38.1 38.6 39.1 39.3 39.3 39.3 39.AGE 180001 25.8 27.1 30.8 32.1 3.4.1 36.3 31.3 37.6 38.1 39.6 39.1 39.3 39.3 39.3 39.8GE 160001 25.8 27.1 30.8 32.1 34.1 36.3 37.3 37.6 38.1 38.6 39.1 39.3 39.3 39.3 39.8GE 1840001 25.3 27.1 30.8 32.1 3.4.1 36.3 37.3 37.6 38.1 38.6 39.1 39.3 39.3 39.3 39.8

CGE 120001 25.8 27.1 30.8 32.1 34.1 36.3 37.3 37.6 38.2. 38.6 39.1 39.3 39.3 39.3 39.8

GE 100001 26.1 27.3 31.6 32.8 3.4.8 37.1 38.1 38.3 38.8 39.3 39.8 40.1 40.1 40.1 .40.6CGE 900101 26.6 27.8 32.1 33.3 3S.3 37.6 38.6 36.8 39.3 39.8 40.4 40.'6 40.*6 40.6 41.1

GE 80001 28.3 29.8 34.3 35.6 37.6 39.8 40.9 41.1 41.,6 42.1 42.6 4 2 .9 .42.9 42.9 '43.4GE 70001 28.3 29.8 34.6 36.3 38:,3 4.0:6 41.6 41.9 42..4 '02.9 43.4 143.6 43.6 .43.6 .44.1GE 60001 28.3 29.8 34.6 36.3 38.3 40. 6 41.6 4 1.9 '02.4 .42.9 43.4 43.6 43.6 43.6 44.1

rGE 50001 30:6 32:1 36.:8 38. 410.6 42:9 43:9 44:1 44.6 45.1 45.6 45.9 45.9 495.9 46.4GE4 1 3. 3 363. 40.1 42. 44.4 45 %S.6 46.1 46.6 47.1 47.4 417.4 4 7.4 47.9

GE 410001 33.6 3S.6 41.1 t12.9 45.1 .47.4 48.6 48.9 49.4 49.9 50.4 50.6 50.6 50.6 51.1GE 350u1 38.b 4 1.4 47.6 49.9 52.1 54 .4 55.6 56.41 56.9 57.4 57.9 58.1 58.1 59.1 58.6GE 30001 44.1 47.6 54.4 S6.6 59.1 61.4 62.7 63.4 63.9 64.4 64.9 65.2 6S.2 65.2 65.7

GE 25001 4184 52:4 59.1 61.4 63.9 66.2 67.4 68.2 68.7 69.2 69.7 69.9 69.9 60.9 70.4r GE 2000 511 55.4 63.7 6&.2 68.7 71 .2 72.4 73.2 73.7 74.2 74.7 74I.9 74.9 74.9 75.4

GE 18~aI 51.1 55.4 63.? 66.2 68.-7 7g .2 72.4 73.2 73.7 74.2 74.7 74j.9 74.9 74.9 75.4GE 15001 51.6 56.1 64.9 69.4 71.9 74.7 76.2 77.4 '7.9 78.4 78.9 79.2 79.2 79.? 79.7

C.GE 12001 52.9 57.6 66.9 71.4 73.9 76.7 78.2 79.4 79.9 80.5 81.0 81.2 81.2 81.2 81.7

GE 10001 53.1 58.4 67.9 72.7 75.7 78.4 79.9 81.5 .42.0 82.5 83.0 83.2 83.2 83.2 84.0b E 9901 93.1 58.4 67.9 72.7 75.7 78 .4 79.9 81.7 82.2 82.7 83.2 83.7 83.7 8 3.7 8.4.5GE 8001 53:6 58.:9 68.4 73.4 76.4 79.:2 81.7 82:S 83:0 835 84:0 847 4. 847 85GE 7Go 53.9 69 69? is.9 79. 82. 8 3.5 85.2 86. 867 87.2 88. 88. 840 88.7

C)GE Go0l S3.9 59.6 70.2 76.4 79.1 82.5 814.0 86.2 87.2 88.0 89.0 89.7 89.7 89.7 90.7

GE sool 53.9 59.:6 70.2 76.7 79.9 82.7 84.2 86.5 87.5 88.2 89.2 90.2 90.2 90.?, 91.2GE 100 1 53. 59.6 70.2 77.4 61.0 83.7 86.0 88.2 89.2 913.7 91.7 93.0 93.2 93.2 94.2

GE 3001 53.9 59.6 70.2 77.f4 81.0 83.7 86.0 88.2 89.2 91.2 92.2 94.0 94.2 94.2 9.GE 2009 S3.9 59.6 70.2 77.4 81.0 83.7 86.0 88.2 A9.2 91.2 92.5 94.5 95.2 99.2 97.5GE 1001 53.9 S9.6 70.2 77.41 61;0 83 .7 86.0 8.2 89.2 91.2 92.5 94.5 95.2 95.2 100.0

GE 01 53.9 59.6 70.2 77.4 81.0 83.7 86.0 88.2 89.2 91.2 92.5 94.5 96.2 95.2 100.02. . .................................. o.................................................

TOTAL NUMBER OF OPSERVATIONS 2 399

u-i

J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITyUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 76-87MONTH: FEB HOURS(LSTI: 0300-O5OO

CEILING VISIBILITY IN HUNDREDS OF METERSIN | GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 60 60 48 40 32 24 20 16 12 10 a 5 4 a

NO CEIL J 20.1 21.3 26.7 29.0 29.8 30.5 31.1 31.2 31.5 31.7 31.8 32.3 32.4 32.4 33.7

GE 20001 21.3 22.4 28.7 31.8 32.6 33.3 33.9 34.0 34.3 34.5 34.6 35.0 35.2 35.2 16.5GE 180001 21.4 22.6 28.9 32.0 32.7 33.4 34.0 34.2 34,5 34.6 34.8 35.2 35.3 35;3 36.7

GE 16C00i 21.4 22.6 2s.9 32.0 32.7 33.4 34.0 34.2 34.5 34.6 34.8 35.2 35.3 35.3 36.7GE 14OU01 21.4 22.6 289 32.0 32.7 33.*4 34.0 34.2 34.5 34.6 34.8 3S.2 35.3 3;.3 36.7GE 12oUI 21.4 22.6 26.9 32.0 32.7 33.4 34.0 34.2 34.5 34.6 34.8 35.2 35.3 35.3 3b.7

GE 100001 22.0 23.2 29.5 32.6 33.3 34.0 34.6 34.8 35.0 35.2 35.3 35.8 35.9 35.9 37.2GE 9ooi 22.7 23.9 30.2 33.3 34.0 34.6 35.3 35.5 35.6 3S.9 36.1 365, 36.7 36.7 38.0GE 80001 24.0 25.4 32.4 35.5 36.2 37.0 37.5 37.7 38.0 38.1 38.3 38.7 38.9 .9.9 40.2GE 70001 24.2 25.5 32.6 35.8 36.'5 37.2 37.6 38.0 36.3 38.4 38.6 39.0 39.1 39.1 40.5

0 GE 60001 24.2 25.5 32.8 36.2 37.0 37.7 38.3 38.4 36.7 38.9 39.0 39.q 39.6 39.6 40.9

GE 50001 25:2 26.:5 34:8 36.1 389 39.6 40.2 40.3 40.6 40.8 40.9 41.3 41.5 4 1.5 42.8GE o4500 26.2 27.6 365 4 0.2 41.1 41.8 2. 4 42.5 42.6 43.0 43.1 43.5 43.7 43.7 45.0GE 40001 29.0 30.4 40.3 i4..4 45.5 46.2 47.1 41.4 417.9 48.1 48.2 46.7 48.8 488 50.1GE 35001 30.9 32.8 43.4 47.6 49;0 50.0 50.9 51.2 51.6 51.9 52.1 52.5 52.6 52.6 54.0GE 30001 35.6 38.7 50.% 55.7 56.9 57.9 59.1 59.4 60.1 60.3 60.4 60.9 61.0 61.0 62.3

GE 25Q01 40.0 43.4 55.1 60.4 61.6 62.8 63.9 64.4 65.1 65.2 65.4 65.6 66.0 66.0 67.3GE 20001 42.2 46.2 S6.4 64.1 65.4 66.6 67.7 68.2 69.4 69.5 69.6 7O.1 70.2 70.2 71.6GE 18001 42.4 46.5 59.1 64.8 66.1 67.4 68.6 69.1 70e'2 70.4 70.5 71.0 71.1 71.1 72.4GE 150 44.1 48.7 62.0 68.6 70.2 72.0 73.5 73.9 75.4 7S.5 75.7 76.1 76.2 76.2 7T.6

C: GE 12G01 45.6 50.4 65.0 72.0 73.6 75.4 77.0 77.4 79.9 80. 80.4 80.8 60.9 80.9 82.3

GE I)OO 46:0 51.6 66.4 73.5 75.1 76.6 78.4 78.9 81.4 81.7 81.8 82.3 62.4 82.4 83.7cGE 900 46.6 52.2 67.0 74.2 75.6 77.6 79.2 79.6 82.3 82.6 82.7 83.1 83.3 83.3 84.6

GE 8001 46.6 52.5 67.4 75.1 76.7 78.4 80.1 80.5 83.3 83.6 83.7 64.2 64.3 84.3 85.6GE ?003 47.2 53.4 68.6 76.5 78.3 80.4 62.0 82. 1 85.2 85.5 85.6 $6.1 86.2 86.2 67.5

E GE 6a01 47.4 53.5 69.1 77.1 789 80.9 82.6 63.4 86.2 86.8 67.0 87.4 87.S 67.5 66.9

GE SOO 47.4 53.7 69.2 77.3 79.2 81.2 62.8 63.1 06.7 67.2 67.4 88.3 46.4 89.4 69.7C GE 4i0 47.4 53.8 69.5 77.6 79.6 81 7 84.0 85.0 88.3 89.4 69.6 90.5 90.6 9!.6 92.1

GE 3001 47.4 53.8 69.5 77.7 79..6 82.1 84.5 85.8 69.7 90.9 91.1 91.9 92.1 92.S 94.4GE 2001 47.4 53.8 69.5 77.7 79.6 82.3 84.6 85.9 90.6 91.9 91.9 93.0 94.0 94.6 97.4

C GE 1003 47.4 53.8 69.5 77.7 79.8 82.3 84.6 86.1 90.8 91.9 92.1 93.1 95.2 95.7 99.7

GE 3 41.4 53.8 69.5 77.7 79.6 82.3 84.6 86.1 90.8 91.9 92.1 93.1 95.2 95.7 100.0

.............................................................................................................................................


.Io

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOUqLY OBSERVATIONSAIR WEATHER SERVICE.M AC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-41MONTH: FEB HOURSELSTI: 0607-0800

CEILING VISIBILITY IN HUNDREDS OF METERSIN I G7 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 63 48 40 32 24 20 16 12 10 8 5 4 0

NO CEIL I 17.2 19.6 22.8 23.4 24.3 26.Z 26.4 27.2 28.9 29.1 29.2 29.5 29.6 29.9 31.1

GE 200001 19.5 22.0 25.9 26.6 27.8 30.0 30.4 31.2 32.9 33.2 33.3 33.6 33.7 33.9 35.1GE 180001 19.5 22.0 25.9 26.6 27.8 30.0 30.'4 31.2 32.9 33.2 33.3 33.6 33.7 33.9 35.1GE 160001 19.5 22.0 25.9 26.6 27.8 30.0 30.4 31.2 32-.9 33.2 33.3 33.6 337 33.9 35.1GE 14000l 19.5 22.0 25.9 26.6 27.8 30.0 30.4 31.2 32.9 33.Z 33.3 33.6 33.7 33.9 35.1GE 120001 19.5 22.0 25.9 26.6 27.8 30.0 30.4 31.2 32.9 33.2 33.3 33.6 33.7 33.9 35.1

GE 100001 19.9 22.4 26.3 27.0 28.2 30.4 30.8 31.6 33.4 33.7 33.8 34.1 34.2 34.5 35.7GE 90001 20.1 22.6 26.6 27.2 28.4 30.7 31.1 31.8 33.7 33.9 34.1 34.3 34.5 34.7 35.9GE 80001 21.8 214.3 28.8 29.5 30.7 33.0 33.7 34.5 36.3 36.6 36.7 37.0 37.1 37.4 38.6GE 70001 22.4 24.9 29.3 30.1 31.3 33.7 34.S 35.3 37.1 37.4 37.5 37.8 37.9 3F.2 39.3GE 60001 22.4i 24.9 29.3 30.1 31.3 33.7 34.S 35.3 37.1 37.4 37.5 37.8 37.9 38.2 39.3

GE 5Pooi 23.3 25.8 30.7 31.6 32.8 35.1 35.9 36.8 38.7 38.9 39.1 39.3 39.5 39.7 40.9GE 45001 24.2 27.0 32.8 33.8 35.0 37.5 38.4 39.3 41.3 41.6 41.7 42.0 42.1 42.4 43.6GE 43001 26.4 29.7 36.2 37.5 38.9 41.8 42.8 43.7 45.7 45.9 46.1 463 46.4 4 6.7 47.9GE 35001 28.4 32.1 39.3 40.9 42. 5.5 47. 44.0 50.1 50.4 50.5 50.8 50.9 51.2 52.4GE 30001 31.2 35.0 43.0 45.1 47.1 50.4 52.2 53.3 55.7 55.9 56.1 56.3 56.6 56.8 58.0

GE 25001 35.5 39.9 48.7 51.1 53.4 56.8 58.8 60.0 62.6 62.9 63.0 63.3 63.6 63.8 65.0C. GE 20001 37.5 42.1 51.8 54.5 57.0 60.8 6Z.8 63.9 66.6 67.0 67.1 67.4 67.9 68.2 69.3

GE 18001 37.8 42.4 52.4 55.0 57.6 61.6 63.6 64.7 67.4 67.8 67.9 68.2 68.7 68.9 70.1GE 15001 39.6 44.5 54.9 57.9 60;8 64.9 66.8 68.0 70.8 71.2 71.3 71.6 72.1 72.4 73.6

C GE 12001 40.5 S5.8 56.8 60.3 63"2 67.5 69.9 71.1 73.9 74.3 74.5 74.9 75.4 75.7 77.0

GE 10001 41.3 46.7 57.9 61.3 64.2 68.6 71. 12.4 75.9 76.4 76.6 77.0 7T.S 77.8 79.1GE 9UO0 q1.6 47.0 58.7 62.1 65.0 69.5 72.0 33 76.8 I77. 77.9 78.4 78.9 T9.2 80.5

GE 8001 142.0 4 7.6 59.6 63.2 66.2 70.8 73.3 74.6 78.8 79.7 79.9 80.5 81.1 81.3 82.6GE 70012. 48.7 61.1 65.1 68.3 73.2 75.9 77.2 4:4 824 82.5 83.2 83.7 83.9 85.3GE 6001 4 2.4 488 61.6 65.9 69.1 74.2 77.1 78.7 83.0 83.9 84.1 84.7 85.3 85.5 86.8

GE 5001 42.41 48.8 61.7 66.2 69.5 74.7 77.9 79.5 83.9 84.9 85.0 85.7 86.2 86.4 88.0GE 4lG0 42.4 8l8.8 6L.8 66.3 69;6 7S.0 78.7 80.4 3S.7 86.7 86.8 87.6 88.3 880.7 90.9GE 3001 42.4 48.8 61.8 66.3 69.7 7S.3 79.2 81.1 87.0 88.3 88.4 89.2 89.9 9%3 92.8GE 2U01 42:.4 48.8 61.8 66.3 69.7 7I.4 79.3 81.2 87.4 88.7 88.9 90.0 91.6 92.S 96.1GE 1001 42.4 48.8 61.8 66.3 6907 75.5 79.5 81.3 87.6 84.9 89.2 90.4 93.0 94.6 100.0

GE D 42.4 48.8 61.8 66.3 69.7 7S.s 79.5 81.3 87.6 88.9 89.2 90.4 93.0 94.6 100.0

TOTAL NUMBER OF OBSERVATIONS: 7bO

.

LOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYFFT A C FROM HOUQLY OBSERVATIONSAIR WdEATHE[R SERVICEIRAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: FEB HOURSILST|: 0903-1100- -- CE. .... ... .... ... ....... ..... ......... ........" " "''.""..".''".''' '."...........N".".......D."....." t T .. .. .........................0°' " ' '

CEILING VSIBILITY IN HUNDREDS OF METERSIN ST GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

O FEET I 160 90 80 60 18 100 32 2N 20 16 12 10 a 5 V 0.. . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . .......................... e eoo o. ... . ... • .. . .... . . . .

o NO CEIL 1.0 15.0 17.7 19.2 19.7 23.10 21.9 22.6 23.0 23.1 23.1 23.2 23.8 24.2 25.1

GE 200001 17:.1 19.0 22.. 24:6 25.2 27.2 28.0 28:8 29.1 29.5 29.6 29.,8 30.1 30.8 31.8GE 18000 17 5 192 22 6 241 7 25,3 27 4 28 1 28 9 29 5 29.6 29.8 29.9 30.5 3.9 31.9GE 160001 17.5 19.2 22.6 21.7 25.3 27. 28.1 28.9 29.5 29.6 29.8 29.9 30.5 30.9 31.9GE 16000 17.5 19.2 22.6 21.7 25.3 27.4 28.1 28.9 29.5 29.6 29.8 29.9 30.5 30.9 31.9

GE 12000 17.8 i9.5 23.1 25.3 26.0 28.0 28.8 29.5 30.1 30.3 30.4 30.5 31.1 31.5 32.5

GE 100001 19.1 21.3 25.1 27.41 28.1 30.1 30.9 31.7 32.3 32. 32.5 32.7 33.3 33.7 34.7GE 90001 20.2 22.1 25.9 28.2 29;1 31.3 32.0 32.8 33. 33.5 33.7 33.8 31.10 30.8 35.8GE 8001l 24.5 26.1 30.1 32.8 33.'8 35.9 36.9 37.7 38.3 38.5 38.6 38.7 39.3 39.7 10.7GE 7OU01 25.5 27. 31.5 30.2 35.2 37.3 38.3 39.1 39.7 39.8 10.0 00.1 0.7 101.1 102.1GE 60V01 25.6 27.5 31.8 34.10 35.14 37.7 38.7 39.5 10.1 00.2 410.1 40.5 11.1 41.5 -- 2.5

GE 53001 27.2 29.3 33.5 36.41 37.5 39.7 411.0 11.7 12. 12.5 412.6 12.7 10 3.1 103.8 4.8GE 15001 28.2 30.3 310.9 38.3 39.5 11.7 13.1 4101.1 41.8 101.9 105.0 15.1 15.8 16.2 417.2GE 10001 30.6 33.14 38.7 12.4 413.6 16.3 17.7 18.8 19.1 419.6 19.7 419.8 50.41 5[r.8 51.8GE 35001 !2.9 36.1 12.41 416.0 17.'8 50.8 52.3 53.5 51.1 51.10 51.5 510.6 55.2 55.6 56.6GE 30001 35. 39.1 16.0 419.9 52.0 55.7 57.5 58.6 59.5 59.8 59.9 60.0 60.7 61.0 62.0

GE 2!DOI 37.8 11.9 19.1 53.2 55.2 59.1 61.0 62.4 63,7 63.9 641.1 61.2 61.8 65.2 66.2C GE 20O01 39.8 91.1 S2.3 56.6 58.8 63.1 65.1 66.6 68.2 68.6 68.9 69.1 69.7 70.1 71.1GE 18001 90.0 1.103 52.5 56.7 58.9 63.2 65.2 66.7 68.3 68.7 69.0 69.2 69.9 70.2 71.2GE 15001 10.9 105.1 541.1 58.8 61.0 65.7 68.2 69.7 71.8 72.1 72.0 72.8 73.:1 73,8 714:8

C"' GE 12001 11.6 16.3 56.2 61.2 63.8 68.5 71.8 73.8 76.2 76.5 76.9 77.3 77.9 78.3 79.3

GE LOGO 12.2 17:0 57.4 62.5 65. 70.2 73.8 7S.8 78. 79.1 79.8 80.2 80.8 81.2 82.2GE 9001 02.5 17 .1 57.9 63.2 66.1 71.0. 71.5 76.8 79.6 81.6 81.7 82.2 82.8 8 T.2 8'4.ZGE 8ool 12.5 17.10 S8.0 63.6 66.8 72.1 75.7 77.9 81.0 82.0 83.1 83.7 610. 80.7 85.8GE 7001 12.9 17.8 58.6 61.6 68.0 73.8 77.8 80.1 83. 81 ..1 85.5 86.1 86.8 87.1 88.1GE 6001 13.1 418.2 59.0 65.1 68.5 710. 78.8 81.1 80.6 85.6 86.8 87.6 88.0 88.8 89.8

GE 5001 13.1 18.2 5 9

.0 65.2 68.6 710.7 79.6 82.0 85.9 86.9 88.1 89.0 89.8 90.2 91.2GE %l0o0 103.1 18.2 59.0 65.2 68.6 71.8 79.8 82.6 86.9 88.1 89. 92.3 91.0 91.4 92.GE 3001 13.1 18.2 59.0 65.3 68.7 71.9 79.9 83.1 87.6 89.3 91.0 92.1 93.2 93.6 95.7GE 2001 13.1 18.2 59.0 65.3 66.7 710.9 79.9 83.1 17.6 89. 91.2 92.1 91.6 9s.6 97.9GE 1001 13.1 18.2 S9.0 65.3 68.7 710.9 79.9 83.2 87.6 89.1 91.2 92.1 95.0 96.3 99.9

GE 01 13.1 08.2 59.0 65.3 68.7 741.9 79.9 83.1 87.6 89.0 91.Z 92. 95.0 96.3 100.0............................................................................................................................................


.I)

0LOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Of OCCURRENCE OF CEILING VERSUS VISIBILITY

SAINNME:03S623 STATION NAME: RAF ALC04BURT UNR7M INGDLBSVTO NS PR OrO RECORD: 78-B?

MONTH: FEB HOURSILSIL: 1203-1400

CE IL vN VISIBILLI IP I4UDROS OF PETERSIN 1 BT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 1 160 90 80 60 48 40 32 24 20 26 12 10 a 5 4 0

NO. CEL 11.1 lB.' 21.1 2?.1 22.8 23.6 23.9 24.0 Z4.0 Z14.0 24.1 Z4 .1 24.1 24.1 ZN.1

GE 20nO01 21.3 24.6 28.% 30.2 30.8 32.1 32.5 32.6 32.6 32.6 32.7 32o 32.7 32.7 33.3GE 18)DE.I 21.8 25.1 29.0 30.8 31. 4 32.7 33.1 33.2 33.2 33.2 33.3 33.3 33.3 3ST*3 33o9GE 16,1001 21.8 2S5.1 29.0 3D.9 31.3 32.8 33.Z 33.3 33.3 33.3 33.4 33.4 33.4 3 3.4 34.0GE 140 U0!~ 22.1 23. 3 29.2 31.1l 31.1 33 .1 33... 33.5 33.5 33.5 33.7 33.7 33.7 3 3.7 34.2

GE 1 2000Q1 22.4o 2S5.7 29.6 31.6 32.3 33.7 34.0 34.1 34.1 34.1 34.2 34.2 34.2 34.2 34.8

GE I DroljO 214.7 28.2 32.1 34.1 34' A 36.3 36.8 36.9 36.9 36.9 37.0 37.0 37.0 37.0 37.6

GE 90001 24:8 28. 4 32.:6 34.7 35.41 36.9 37.4 37.5 37.5 37.5 37.6 37.6 37.6 37.6 38.2

G E &COD 28.4 32.:3 36.9 39.0 39.7 41.2 41.9 42.0 42.0 42.1 42.2 42.2 42.2 42.2 42.8GE 701 ;9.0 32.9 37.6 39. 4T.0.6 42.0 42.7 42.8 42.8 43.0 43.1 43.1 43.L 4 3.1 43.7GE 6100a,1 29.2 33.2 31.8 '40.0 40.8 42.2 43.0 43.1 43.2 43.3 43.4 430, 43.4 4 3.4 44.0

GE SLID01 !O.9 33.0 39.9 42.0 42.8 4#4 .4 45.3 45.5 45.6 45.7 45.8 45.8 $43.8 45.8 46.4GE 45001 32.6 34.9 41.9 441.2 43.0 46.8 47.7 47.9 48.2 48.3 48.4 48.4 48.4 44.4 149.0GiE 40001 37.0 41.5 47.1 49.5 50.3 S2.S 53.8 53.9 54.3 54l.41 54.5 54.5 54.5 54o5 55.1GE 353201 40.1I r 45.2 31.0 S3.3 54. 3 36.6 58.1 58.2 58.6 58,7 58.8 ~o 58.8 58.8 598 9.4GE 3(r00i 45.5 S1.0 57.5 60.0 61.'0 63.5 65.4 65.6 66;0 66.1 66o2 66..2 66.2 66.2 66.8

E 250 9: 47:.3 53.:0 %9.80 62.:3 6 3.2 65.:8 61.:9 683 68.:7 689 6 9:0 69:0 69:0 6 9:0 69:6

CGE 2300 49.5 53.7 63. 65.8 66.8 69. 71. 721 72.9 73.0 73.2 73.2 73.2 7 3.2 73.76E 180G1 49.8 56.1 63.4 66.1 67.2 69.9 72.1 12.4 73.3 73.4. 73.5 73.5 73.5 73.5 74.1

GE 15001 51.7 58.2 65.6 68.o9 69.9 72.8 75.3 75.7 76.5 76.6 76.7 76.7 76.7 76.7 77.3GE 121.02 '.2 6fl.3 68.6 72.7 74.0 77.7 80.9 81.5 82.6 82.7 82.8 82.8 82.8 82.8 83o4

GE iTvoG 53.8 61.2 b9.6 714.2 75.7 79.5 82.8 83.4 84.5 84.6 84.8 84.8 84.8 84.8 85.4GE 9001 53.8 61.2 69.7 74.3 75.'9 79.7 8 3.1 83.7 85.0 85.2 85.6 85.6 85.6 8S.6 86.26E soul 541.1 61.5 70.3 75.2 76.6 8ass 84.2 85.0 86.4 86.8 87.1 87.1 87.1 87.1 87.7GE 7%0 kiI 5o 61.6 M0.6 75.7 77.4t 82.0 86.5 87.2 86.9 89.3 89.7 89.7 89.9 89.9 90.5GE 6001 54.3 61.7 70.8 75.9 77.8 82.S 87.5 88.7 90.6 90.9 91.4 91.4 91.6 92.6 92.2

GE soul9 54.3 61.8 71.0 76 .3 78. 3 83 .2 88.4 89.? 91.9 92.7 9 3.4 93.4 93.9 9 3.9 94.5bE 41201 54.3 Al.8 71.0 76.3 78.3 83.11 88.9 90.5 *93.1 94.0 94.9 95.1 95.6 95.6 96.2GE 3001 54.3 6t .8 71.0 76.3 78.3 83.4 89.0 90.7 93.9 95.0 95.9 96.2 96.8 96.8 98.06E 2001 54.3 61 .8 71.0 76.3 78.3 83.4R 89.0 90.9 94.46 95.5 96.5 96.8 97.5 97.6 98.8

j GE 1001 54.3 61.8 71.0 76o3 78.3 83.,0 89.0 90.9 914.4 95.5 96.5 9b.8 97.? 94.0 99.8

GE 01 54.3 61.8 71.0 76.3 ?&. 3 83 .4 89.0 90.9 94.4 95.5 96.5 96..8 97.7 99.0 200.0

TOTAL NUMBER OF 085(RVATIONS: 838

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONS

AIR VEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOO OF RECORD: 78-87MONTH: FEB HOURSILSTI: 150-17300

CEILING VISIBILITY IN HUNDREOS OF METERS

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

,0 FEET I 160 90 80 60 N8 40 32 24 20 16 12 10 8 S N 0

.....................................................................................................................................

NO CEIL I 20.7 22.2 24.7 25.9 26.2 26.4 26.9 26.9 27.0 27.0 27.0 27,0 27.0 27.0 27.0

GE 200001 26.9 29.0 32.7 34.5 34.9 35.5 36.0 36.0 36.1 36.1 36.1 36.1 36.1 36.1 36.3

o GE L60001 26.9 29.0 32.7 34.6 35.0 35.7 36.2 36.2 36.3 36.3 36.3 36.3 36.3 36.3 36.6GE 160001 26.9 29.0 3207 34.6 35.0 35.7 36.2 36.2 36.3 36.3 36.3 3603 36.3 36.3 36.6

GE 140001 270 29.2 32.9 34.8 35.1 35.8 36.3 36.3 36.4 36.4 36.4 36.4 36.4 36.4 36.7G 12000 27.1 29.3 33.a 35.0 35.4 36.1 36.6 36.6 36.7 36.7 36.7 36.7 36.7 36.7 36.9

GE 100001 28.7 30.9 34.6 36.7 37.0 37 o9 38.5 38.5 38.6 38.6 38.6 38o6 38.6 38.6 38.8

o GE 90001 28.9 31.2 35.0 37.0 37.4 38.2 38.8 38.8 38.9 38.9 38.9 38.9 38.9 39.9 39.2GE 80001 32.3 34.9 39.3 41.5 41.9 92.8 43.4 43.4 43.S 43.5 43.5 43.5 43.6 43.6 43.8

GE 70'001 32.6 35.2 39.9 42.1 42;5 43.4 44.0 44.0 44.1 44.1 44.1 44.1 44.2 44.2 44.4GE 6 00 32.7 35.4 40.0 42.2 42.7 43.5 44.1 44.1 44.2 4.2 44.2 44.2 44.3 44.3 44.6

GE 50001 33.9 36.6 41.5 43.7 44.2 45.0 45.8 45.8 46.0 46.0 46.0 46.0 46:1 46.1 46.4

GE 45OU 35.4 38.1 43.1 4s.4 45.,9 46.8 47.6 47.6 147.8 47.8 47.8 4748 47.9 47.9 48.1GE 40001 40.0 43.0 48.1 50.4 5104 52.7 53.5 53.5 53.8 53.8 53.9 54.0 54.1 54.1 S4.4GE 35001 44.2 %7.7 53.3 55.6 56.6 58.1 59.1 59.1 59.4 59.4 59.5 59.b 59:7 59:7 60.O

GE 3!'OOi 48.9 52.7 59.1 61.9 63.3 65.0 66.1 66.2 66.7 66.7 66.8 66.9 67.0 67 0 67.3

GE 25001 50. 9 55.2 62.1 64.9 66.7 68.3 69.5 69.7 70.1 70.1 70.3 70.4 70.5 71.5 70.7

GE 20001 52.2 56.8 60.9 68.1 70.3 72.0 73.2 73.7 74.3 74.4 74.6 74.7 74.8 74.8 75.0GE 18001 52o2 56.8 65.1 68.3 70.5 72.3 73.6 74.1 74.8 74.9 75.0 75.1 75.3 75.3 75.5GE 15001 54.4 59.5 68.8 72.3 74.7 77.1 79.0 79.7 80.4 80.5 80.6 B08 80.9 8.9 81.1

o GE 12001 55.4 60.7 70.5 74.1 76.6 79.7 82.0 82.7 83.5 83.6 83.8 83.9 64.0 8.0 84.2

GE 13001 55.9 61.3 71.7 75.4 77.9 81.1 83.6 84.5 85.4 85.5 85.8 86.1 86.3 86.3 86.5

C GE 9001 S5.9 61.3 71.9 75.6 78.1 61.4 84.0 84.8 85.8 85.9 86.1 86.5 86.7 86.7 87.0GE 8001 56.0 61.4 72.2 76.1 78.6 82.0 84.8 85.9 86.9 87.0 8702 87.6 07.8 87.8 88.1GE 7001 56.4 62.0 72.8 77.7 80.8 84.S 87.9 89.4 90.4 90.7 90.9 91.3 92.2 92.2 9205

GE 6001 56.6 62.4 73.2 78.3 81.5 85.2 89.1 90.8 92o8 93.2 93.7 94.9 95.0 95.0 95.2

GE 500| 56.6 62.4 73.2 78.3 81.7 85.5 89.6 91.3 93.7 94.3 94.7 95.1 96.2 96.2 96.4

GE 1001 56.6 62.4 73.2 78.4 82.0 85.8 90.0 91.6 94.0 94.7 95.6 95.9 97.0 97.0 97.3

GE 3%oal 96.6 62.4 73.2 78.4 82.0 85.8 90.1 91.8 94.5 95.3 96.4 97.0 98.4 98.4 99.0GE 2001 56.6 62.4 732 780.4 82'0 85.8 90.1 91.8 94.5 9.3 96.5 97.4 98.8 98.9 99.5GE 10o 56.6 62.4 73.2 78.4 82.0 85.8 90.1 91.8 94.5 9S.3 96.5 97.1 98.9 99.0 1r000

GEr 0 56.6 62.4 73.2 78.4 82.0 85.8 90.1 91.8 945 95.3 96.5 97.4 98.9 99.0 100.0

GE o .. 1 ....... .... ... . . . 95:: .... .. !6. . .


-Ei

.- o2

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONS&IR WEAIHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO48URY UNITED KINGODOM PERIOD OF RECORD: 78-87MONTis: FEB HOURSILSTI: 1830-2L00.. .. ... .. .... .. .. ... ... .. ... .. ... ... .. ... ... .. ............ .. . ................................

CE IL ING VISIBILIYNHUDESO METERSING G7 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 160 90 80 60 48 40 3z 24 20 16 12 10 8 5 4 0. . . . .. ..................... .... ....... .............................................................................

NO CEIL I 22.4 24.8 27.4 28.5 28.7 29.5 30.8 30.8 30.8 30.8 30.8 30.8 30.8 30.8 31.3

GE 200001 26.1 29.5 32.8 34.5 34.9 36.5 37.7 37.7 37.7 37.7 37.7 37.7 37.7 37.7 38.3GE 180001 26.1 29.5 32.8 34.5 34.9 36.5 37.7 37.7 37;'? 37.7 37.7 37.7 37.7 37*1 38.3GE 160001 26.1 29.5 32.8 34.5 34.9' 36.5 37.7 37.7 37.7 37.7 37.7 37.7 37.7 37.7 38.3GE 140001 26.5 29.9 33.2 34.9 35.'3 36.9 38.2 38.2 38.2 38.2 38.2 38.2 38.2 38.2 38.7GE 120001 26.7 30.1 33.3 35.0 35.5 37.0 38.3 38.3 38.3 38.3 38.3 38.3 38.3 38.3 38.9

GE 10000 27:. 31.1 34.3 36.2 36.9 38.4 39.7 39.7 39.7 39.7 39.7 39.7 39.7 39.7 40.3GE 9000, 27.4 31.1 34.3 36.2 36.9 38.4 39.7 39.7 39.7 39.7 39.7 39.7 39.7 39.7 40.3GE SCOol 31.1 34.8 38.4 40.4 41*4 43.3 14.5 44.5 44.5 44.5 44.5 44.5 44.5 44.5 45.1GE 70001 31.9 35.6 39.6 41.6 42.6 44.4 46.*2 46.2 46.2 46.2 46.2 46.2 46.2 46.2 4b.8GE 600GI 32.2 36.0 40.0 42.0 43.0 44.8 46.7 46.7 46.7 46.7 46.7 46.7 46.7 46.7 47.2

GE 50001 32,6 36.6 40.9 42.8 43.8 45.8 47.7 47.7 47.7 47.7 47.7 47.7 47.7 47.7 48.2GE 41SOO 33.6 37.7 42.4 44.4 45.*4 47.4 49.2 49.2 49.2 49.2 49.2 49.2 49.2 49.2 49.8GE 000 1 37.9 42.8 47.9 SO. 51.5 53.9 55.7 55.7 55.7 55.7 55.7 55.7 55.9 55.9 56.5GE 3SO0 41.7 47.2 53.2 56.2 57.3 60.1 62.1 62.1 62.1 62.1 62.3 62.3 62.4 62.4 63.06E 30001 45.s 51.6 58.4 61.7 63.1 66.0 67.9 67.9 68.2 68.2 68.4 68.4 68.5 68.5 69.1

GE 25001 47.0 53.3 60.6 64.1 66.0 68.8 71.2 71.2 71.5 71.5 71.6 71.6 71.8 71.8 72.3* GE 20001 47.6 54.6 62.6 67.1 6971 72.2 75.3 75.3 75.6 75.6 75.7 75.7 75.9 75.9 76.5

GE 18001 47.9 54.8 63.3 67.8 69.8 73.2 76.3 76.3 76.6 76.6 76.7 76.7 76.9 76.9 77.4GE 15001 49.1 56.5 65.5 71.2 73.3 77.2 81.0 81.0 81.3 81.3 81.4 81.4 81.6 81.6 82.1GE 12001 50.4 58.2 67.s 73.2 75.'3 79.9 84.1 84.1 84.'S 84.S 84.7 84.7 84.8 84.8 85.4

GE 10001 50.6 58.6 68.8 74.5 76.6 81.3 85.5 85.5 86.0 86.0 66.1 86.1 86.2 86.2 87.0GE 9001 50.6 58.6 68.8 74.5 76.8 81.6 85.8 85.8 86.2 86.2 86.4 86.4 86.5 86.5 87.2GE 801 50.8 58.9 69.2 ?S.2 77.3 82.4 87.2 87.2 87.8 88.1 88.2 88.,q 88.5 8.5 89.2GE lOJI 50:9 59: 69:5 76:2 78.4 83:7 88.5 8.5 89:1 89. 89:6 89:. 90:1 91.1 90:8GE 6001 51.3 59.4 69.9 76.6 78.9 84.1 89.2 89.4 90.2 90.S 9.1 91.3 91.9 91.9 92.6

GE 5002 51.5 59.6 70.4 77.3 79.6 85.0 90.2 90.4 91.3 91.9 92.8 93.2 94.3 94.3 95.0GE 4001 51.5 59.6 70.4 77.6 79.,9 8S.4 90.8 90.9 91.9 92.S 94.0 94.5 96.0 96.0 96.9GE 3001 51.S S9.6 70.4 77.6 79.9 85.4 90.8 91.1 92.1 92.6 94.2 99.6 96.7 96.7 97.9

E 2001 51.5 59:6 70.4 77.6 79.9 85a4 90:8 91:1 92.1 92:8 94.3 94.8 96.9 97.0 98.6GE 1001 .5 59.6 70.4 77.6 79.9 85.a4 90.8 91.1 92;1 92.8 94.5 999 97.6 97.7 100.0

GE Ol 51.S 59.6 70.4 77.6 79.9 8s4 90.8 91.1 92.1 92.8 94.5 94.9 97.8 97.7 100.0...................................................................................................................................................


m .nni1 . ~ i

* GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY* USAFETAC FROM HOURLY OBSERVATIONS

AIR biEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITEO KINGOOM PERIOD OF RECORD: 78-87MONTH: FEB HOURS(LST): 2102300

CEILING VISIBILITY IN HUNDREDS OF METERSIN 6GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEo FEET I 160 90 Ro 60 48 40 32 24 20 16 12 10 a S 4 0

NO CEIL I 23.8 26.5 30.4 33.5 34.6 34.9 35.7 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1

UE 200001 25.7 29.1 34.1 37.6 38.9 39.2 39.9 40.4 40.4 40.4 40.4 40.4 40.4 40.4 40.8GE 180oi 25.7 29.1 34.1 37.6 38.9 39.2 39.9 40.4 40.V 40.4 4.4 40.4 40:4 40 .4 40.8GE 1600rJ 25.7 Z9.1 34.1 37.6 38.9 39.2 39.9 40.4 40.4 NO.4 40.4 40.4 40.4 42.14 40.8GE 140001 25.9 29.2 34.2 37.7 39.0 39.3 40.1 40.5 40.S 40.5 40.5 40.5 40.5 40.5 40.9GE ZOOOi 26.0 29.4 34.4 37.9 39.2 39.5 40.2 40.6 40.6 40.6 40.6 40.6 40.6 40.6 41.1

GE 100001 26.6 30.0 34.9 38.6 40.1 40.5 41.2 41.7 41.7 41.7 41.7 41.7 41.7 41.7 42.1GE 90001 26.6 30.0 34.9 38.6 40.1 40.5 41.2 41.7 41.7 41.7 41.7 41.7 41.7 41.7 42.1GE 601 29.5 33.2 38.5 42.3 43.9 44 .6 45.3 46.1 46.1 46.1 46.1 46. 46.1 46.1 46.5GE 70001 29.8 33.5 38.9 42.7 44.3 45.0 46.1 46.8 4 46 46.8 46.8 46.8 46.8 46.8 47.2GE 6J90| 29.8 33.8 39.2 430 414.6 45.3 46.3 47.1 47.1 47.1 47.1 14 47.1 47.1 47.5

GE 50001 70.7 34.8 40.2 44.0 45.6 46.3 47.4 48.1 48.1 48.1 48.1 48.1 48.1 48.1 48.5GE 45001 !2.3 36.4 42.4 46.2 47,.8 48.8 49.9 50.6 50.6 50.6 50.6 50.6 S0.6 51.6 51.0GE 40001 35.7 39.9 46.8 51.3 53.1 54.2 55.3 56.0 56.3 56.3 56.3 56.3 56.3 56.3 56.7GE 3501 38.6 42.8 50.3 54:8 56.6 57.7 58.9 59.6 60.1 60.1 60.1 60.1 60.1 6n.1 60.5GE 30001 42.4 47.1 54.8 59.4 61.7 62.9 64.0 64.8 65.2 65.2 65.2 65.2 65,2 65.2 65.6

GE 25001 44.2 48.8 57.5 62.3 65.4 66.7 67.8 68.6 69.0 69.0 69.0 69.0 69.0 69.0 69.42 GE 20601 47.1 52.2 62.1 68.1 71.3 72.8 74.6 75.3 75.7 75.7 75.7 75.7 75.7 75.7 76.2

GE 18001 47.2 52.3 62.3 68.3 71.5 73.0 75.1 75.9 76.3 76.3 16.3 76.3 76.3 76.3 76.8GE 1SO01 q8.S 53.7 64.2 71.1 74.3 76.2 78.7 79.4 80.0 80.0 80.0 80.1 80.1 8C.1 80.6o GE 12U0I 50.6 55.8 67.3 74.3 77.5 79.7 82.7 83.6 84.2 84.2 84.2 84.4 84.4 84.4 84.8

GE 10001 51.0 56.6 68.6 75.9 79.2 81.4 84.6 85.7 86.3 86.3 86.3 86.4 86.4 86.4 87.3o GE 960 51.0 56.7 68.9 76.2 79.5 81.7 84.9 86.f 86.5 86.5 86.5 67 86.7 86.7 87.6GE s8oI 51.8 57.5 70.0 77.3 80.7 82.9 86.1 87.4 88.0 88.0 88.0 88.2 88.3 88.3 89.2GE 7[.01 51.9 57.9 70:6 78.7 82.2 84.4 89.2 89.6 90.4 90.4 90.4 90.5 90.6 91.6 91:5GE 6GO 52.0 58.0 70.8 78.8 82.3 84.5 88.3 89.8 90.5 90.5 90.6 91.4 91.5 91.5 92.4

GE soul 52.0 58.0 70.9 79.1 82.6 85.1 89.0 90.5 91.2 91.2 91.4 92.3 92.7 92.7 93.6GE 4001 52.0 58.0 71.1 79.4 82. 9 85.7 89.6 91.1 92.0 92.4 93.1 94.1 94.9 94.9 95.9GE 3001 52.0 58.0 71.1 79.4 82.9 85.7 89.6 91.1 92.0 92.4 93.1 94.4 95.6 95.8 97.2GE 2uO| 52.0 58.0 71.1 79.4 82.9 85.7 89.6 91.2 92.1 92.5 93.6 95.5 97.1 97.4 99.3GE 1001 52.0 58.0 71.1 79.4 82.9 85.7 89.6 91.2 92.1 92.5 93.6 95.5 97.2 98.0 100.0

GE al 52.0 58.0 71.1 79.4 82.9 85.7 89.6 91.2 92.1 92.5 93.6 95.5 97.2 94.0 100.0.............................................................................................................................

lOTAL NUMBER OF OBSERVATIONS: 684

~-l


AIR WEATIVER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITFO KINGDOM PERIOD OF RECORD: 78-87MONTH: FEB HOURSILSTI: ALL

.. . . .. . . ..................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 48 N0 32 24 20 16 12 10 8 5 4

NO CElL 19.6 21.3 24.5 26.0 26.7 27.7' 28.3 28.6 29.0 29.1 29.2 29.3 29.4 29.5 30.1

GE 200001 22.8 25.2 29.3 31.3 32.1 33.5 34.1 34.5 34.9 35.0 35.1 35.2 35.3 3c,.4 36.1GE 18000 22.9 2S.3 29.4 31.4 32.'3 33.6 34.3 34.6 35.0 35.1 35.2 35.3 35.5 35.6 36.3GE 16C001 22.9 25.3 29.4 31.5 32.'3 33.6 34.3 34.6 35.0 35.1 35.2 35.4 35.5 3 '.6 36.3

GE 140001 23.0 25.4 29.6 31.6 32.4 33 .8 34.4 34.7 35.2 35.3 35.4 35.5 35.6 35.7 36.4GE 120001 23.1 25.6 29.7 31.8 32.7 34 .0 34.7 35.0 35.4 35.5 35.6 35.7 35.9 35.9 36.7

GE 10)001 24.2 26.8 31.0 33.1 34.0 35.4 36.1 36. 5 36.9 37.0 37.1 37.2 37.3 37.4 38.2GE 90U0D 24.6 27.1 31.4 33.5 34.5 35.9 36.6 36.9 37.3 37.4 37.5 37.7 37.8 37.9 38.6GE 8r100 27.5 30.z 34.9 37.1 38.2 39.7 40.5 40.8 41.2 41.4 41.5 41.6 41.7 4 1.8 42.6GE 7000 ;8.0 30.7 35.6 37.9 38.9 40.4 41.4 4 1.7 42.1 42.3 42.4 42.5 42.6 42.7 43.5GE 60001 28.1 30.9 35.8 38.1 39.2 40.7 41.6 42.0 42.4 42.5 42.6 42.8 42.9 43.0 43.7

GE 5000 29.3 32.2 37.3 39.7 40.8 42.3 43.3 43.7 44.2 44.3 44.4 44.5 44.7 44.8 4 5.5GE 45001 0. 5 33.5 39.1 41.7 42.7 44 .4 45.5 45.9 46.4 46.5 46.6 46.7 46.9 46.9 4 7.7GE 40001 33.9 37.3 43.5 46.3 47.6 49.5 50.7 51.1 SI7 51.8 51.9 52.1 52.2 5?.3 53.1GE 35001 37.0 40.8 47.6 50.6 52.0 514.2 55.5 56.0 56.6 56.8 56.9 57.1 57.2 57.3 58.0GE 30001 1.0 415.3 52.9 56.3 58.0 60.3 61.8 62.4 63.1 63.3 63.4 63.6 63.7 63.8 64.6

GE 250i0 43.7 48.4 56.4 59.8 61.8 64.z 65.9 66.5 67.4 67.5 67.6 67.8 68.0 b 9.0 68.6GE 20001 45.7 50.7 59.7 63.6 65.7 68.3 7O.2 70.9 71.9 72.1 72.3 72.4 72.6 7"'.7 73.5GE 18.01 5.8 50.9 60.0 64.0 66.1 68.8 70.7 71.4 72.5 72.7 72.8 73.0 73.2 7 '%3 74.0

GE 15001 47.3 52.7 62.4 67.1 69.3 72.4 74.7 75.4 76.6 76.8 77.0 77.2 77.4 77.5 74.2GE 12iol 48.6 54.3 64.7 69.7 72.0 75.5 78.3 79.2 80.6 80.8 81.0 81.2 41.4 1.5 82.3

GE I0Ol 49.1 55.1 65.9 71.1 73.5 77.0 79.9 80.9 82.5 82.7 83.0 83.3 83.5 87.6 84.4GE 9o01 49.3 55.3 66.3 71.5 73.9 77.5 80.4 81.4 83.1 83.5 83.8 84.1 84.3 84.4 85.3GE 831 49.5 55.6 66.8 72.2 74.7 78.4 81.5 82.6 84.5 841.9 85.2 85.6 85.8 85..9 86.8GE 7CI| 49.8 56.1 67.6 73.6 76.3 80.3 83.8 84.9 86.9 87.4 87.8 88.1 88.5 44.6 89.4GE 6001 50.0 56.4 67.9 74.0 76.8 80.9 84.6 86.0 88.3 88.8 89.3 89.8 90.2 9 C.3 91.2

GE 5o! 50.0 56.4 68.1 74.3 77.2 81.4 85.3 86.7 89 :2 898 9r1.- 91.0 91.6 91.7 92.6GE 4soT 50.0 56.4 6.1 74 5 77.4 81.8 86.0 87.5 90.2 91.2 92.0 92.6 93.4 91.5 94.5GE 300C 50.0 56.4 68.1 74.5 77.s 81.9 86.1 87.8 90.9 92.0 92.9 93.7 94.7 94.9 96.4

GE 2001 SC.0 56.4 68.1 74.5 77.5 81.9 86.2 87.9 91.2 97.3 93.3 94.3 9S.8 96.2 98.2GE 1001 50.0 56.4 68.1 74.5 77.5 81.9 86.2 88.0 91.2 92.5 93.4 94.4 96.3 97.0 99.9

GE a1 50.0 56.4 68.1 74.5 77.5 81.9 86.2 88.0 91.2 92.3 93.4 94.4 96.3 97.0 IO.0

.................................................................................................................................................


Jo.4

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Of CEILING VERSUS VISIBILITYUSAFETAC FROM -OU9LY OBSERVATIONSAIR wEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURV UNITED KINGDOM PERIOD OF RECORD: 78-8n.82-87

MONTH: MAR HOURS(LSTI: 0000C-0200

CIL ING VI53B3LITY IN HUNDRED]S OF METERS


FEET I 160 90 80 60 48 40 32 24 20 16 12 GO 8 5 4 0

NO CEIL 2 70.4 33.3 35.0 36.6 37.3 38.2 38.4 39.5 39.5 4f.0 40.0 40.2 40.4 4 7.4 40.4

GE 20COUl 31.7 34.6 37.1 38.6 39.3 40.2 40.4 41.5 42.4 42.9 42.9 43.1 43.3 43.3 43.3GE larool 31.7 34.6 37.3 38.8 39.5 40.4 40.6 41.7 42.6 43.1 43.1 43.3 43.5 43.5 43.5GE 160001 31.7 34.6 37.3 38.8 39.5 40 .4 40.6 41.7 42.6 43.1 43.1 43.3 43.5 43.5 43.5GE 14000 31.9 34.8 37.5 39.1 39.7 40.6 40.8 42.0 42.9 43.3 4 3.3 43.5 43.8 4 3.8 M3.8GE 12003) 3 35.3 37.9 39.5 40.2 41.1 41.3 42.4 43.3 43.8 43.8 44.0 Q4.2 4 4.2 4'42

GE IO"Ouc 72. 6 35.7 38.8 40.4 41,1 42.0 42.2 43.3 44.2 44.6 44.6 44.9 45.1 45.1 45.1GE 9060 13.0 36.2 39.3 41.8 41.5 42.6 42.9 44.0 45.1 45.5 45.5 45.8 46.0 46.0 46.0GE 80001 34.2 37.5 40.6 42.4 43.1 44.2 44.4 45.5 46-.7 47.1 47.1 47.3 47.5 47.5 47.5GE 7100 1 14.8 38.2 41.3 43.1 43.'8 44.9 45.1 46.2 47.3 47.8 47.0 48.0 48.2 44.2 4B.2GE 60001 34.8 38.2 41.3 43.1 43.8 44.9 45.1 46.2 47.3 47.8 47.8 48.0 "8.2 18.2 48.2

GE 5CUO 35.9 39.7 43.5 45.3 4.0 4T.1 47.3 48 .4 49.6 50.0 50.0 50.2 50.4 5 -. 4 50.4GE 45LO) 36.4 40.4 44.6 46.7 47.3 48.4 48.7 49.6 50.9 51.3 51.3 51.6 51.8 51.8 51.8GE 40CUI 42.2 46.4 51.8 54.5 55.1 56.3 56.5 57.6 59.2 60.0 60.0 60.3 60.7 6 .7 60.7GE 350 46.7 51.1 57.1 59.8 60.5 61.6 62.3 63.6 65.2 66.1 66.1 66.3 66.7 66.7 66.7GE 3noa) 50.4 56.0 62.3 65.0 65.6 67.4 68.1 69.4 71.2 72.1 72.1 72.3 72.8 72.8 72.8

GE 25001 52.9 58.7 65.8 69.4 7C.1 71.9 72.8 74.3 76.1 77.0 77.0 77.2 77.7 77.7 77.7GE -oo)1 54.2 60.0 67.2 71.4 72.1 73.9 74.8 76.3 78.1 79.0 79.0 79.2 79.7 79.7 79.7GE 18I0 55.4 61.2 68.3 72.5 73.2 75.0 75.9 77.5 79.2 80.1 80.1 80.4 40.8 80.8 80.8

GE ISUOI 38.3 64.5 71.9 76.3 77.2 79.0 80.1 81.9 81.9 84.8 84.8 85.0 85.5 85.5 85.5GE L20O 58.7 65.0 72.5 77.0 76.1 79.9 81.3 83.0 85.o 85.9 85.9 86.2 86.6 86.6 86.6

GE 19001 60.0 66.3 73.9 78.3 79.9 81.7 83.3 86.4 88.4 89.3 89.3 89.7 90.2 91.2 90.2GE 9001 61.6 b

8.3 15.9 80.4 81.9 83.9 85.5 88.6 90.6 91.5 91.5 92.1 92.4 92.4 92.4

GE 8L0 62.5 69.2 76.8 81.7 83.3 85.3 86.8 90.0 92.0 97.9 92.9 93.3 93.8 93.8 93.8

GE 70jI C2.5 69.2 77.0 82.1 83.7 857 87

. 5 90.6 92.6 93.5 93.5 94.0 94.4 94.4 94.4GE 60O 62.7 69.4 77.2 82.4 83.9 85.9 87.9 91.1 93.1 94.n 94.2 94.6 95.1 95.1 95.1

GE Soil 62.7 69,4 77.5 82.6 84.2 86.4 88.6 91.7 93.8 94.6 94.9 95.3 96.0 96.0 96.0GE "baI 62.7 69.4 77.5 82.6 84.2 86.4 88.6 91.7 94.6 9S.5 95.8 96.2 97.1 97.1 97.1GE 300) 62.7 69.4 77.5 82.6 84.2 86.8 89.1 92.2 95.1 96.0 96.2 96.7 97.8 98.2 98.2GE 20ol 62.7 69.4 77.5 82.6 84.2 86.8 89.3 92.4 95.3 95.2 96.4 96.9 08.0 98.4 98.4GE ICA) 62.7 69.4 77.5 82.6 64.2 86.8 89.3 92.4 95.3 96.2 96.4 97.3 98.4 98.9 100.0

GE 9) 62.7 69.4 77.5 82,6 84.2 86.8 89.3 92.4 95.3 96.2 96.4 97.3 98.4 99.9 100.0

...............................................................................................................................................


_2I

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERvICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: MAR HOURS(LSTI: 0300-0500

...............................................................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I CI GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE_ FEET 9 160 90 8 60 48 80 32 28 20 16 12 10 8 5 8 0

... ................. ........................................... o ....... ........ ............................

" NO CElL I 29.6 31.2 35.2 36.4 36.5 37.7 37.9 38.8 39.0 39.1 39.2 39.3 39.5 39.6 39.8

GE 200001 32.1 33.7 38.3 40.2 40.5 81.6 81.9 42.8 43.0 43.2 43.3 43.4 43.6 43.7 43.9GE 180109 !2.2 33.8 36.4 40.4 80.b 41.0 42.0 42.9 43.2 43.3 43.4 43.6 83.7 43.8 44.1GE 160001 12.2 33.8 38.4 40.4 40.6 41.8 42.0 42.9 83.2 43.3 43.4 43.6 83.7 4 3.8 44.1GE 14101 32.2 33.8 38.4 40.4 80.6 41.8 82.0 42.9 43.2 43.3 3.4 43.6 43.7 43.8 44.1GE 12000l 32.6 34.2 3.8 40.7 41.0 42.1 42.8 43.3 43.6 83.7 43.8 43.9 4.1 88.2 444

GE 100001 33.5 35.2 39.8 41.8 42. 0 43.2 43.4 44.3 44.6 44.7 4.8 45.0 85.1 85.2 4.5GE 90001 33.8 35.8 40.4 82.3 42.5 43.7 43.9 44.8 45. 1 45.3 45.5 45.7 45.8 86.0 86.2GE 80001 35.9 37.8 42.4 44.3 88.6 45.8 86.1 87.0 47.3 47.5 47.6 87.9 48.0 489.1 88.GE 70001 35.9 37.8 42.8 44 .3 44.6 45.8 46.1 47.0 47.3 87.5 47.6 48.-0 40.1 48.3 48.5GE 60001 35.9 37.8 42.4 418.3 48.6 45.8 46.1 47.0 47.3 47.5 87.6 48.0 48.1 49.3 48.5

GE 50001 36.8 38.8 44.1 86.8 86.6 47.9 48.1 49.0 49.3 89.6 89.7 50.1 50.2 50.3 50.6. GE 85001 39.1 41.1 86.9 49.6 49.0 51.1 51.3 52.2 52.5 52.9 53ol 53.5 53.6 53.8 54.0

GE 80001 83.8 8S8 52.2 55.0 55.3 56.6 56.8 57.7 58.1 58.6 58.9 59.3 59.5 59.6 59.9GE 35001 87. 49.6 55.9 59.0 59.4 610.7 60.9 62.2 62.6 63.1 63.3 63.7 64.0 68.1 64.GE 30001 52.8 58.9 61.6 65.0 65.4 66.7 66.9 68.2 68.6 69.1 69.3 69.7 70.0 70.1 70.4

GE 25001 540.8 57.5 64.5 68.2 68.7 70.2 70.6 71.9 72.5 73.1 73.3 73.7 73.9 74.1 78.3C GE 29009 56.1 58.9 66.5 70.8 70.9 72.8 72.8 74.1 74.8 75.4 75.7 76.1 76.8 76.5 76.8

GE 18001 56.6 59.4 67.0 71.0 71.5 73.1 73.4 78.7 75.5 76.0 76.8 76.8 77.0 77.1 77.4GE 15009 59:9 63.0 71.6 75.7 76.2 77.9 78.4 79.7 80.5 81.1 81.5 81.9 82.2 02.4 82.6GE 12009 61.7 65.0 78.1 78.8 78.9 80.6 81.1 82.4 83.1 83.8 84.2 88.5 4.9 85.1 85.3

GE iroui 63.6 66.9 76.2 80.8 81.4 83.1 83.7 85.1 85.8 86.5 86.8 87.2 87.6 87.7 88.00 GE 901 68.1 67.4 76.9 81.6 82.1 83.9 84.4 86.0 86.7 87.8 87.7 880.1 88.5 88.6 88.9

GE 8001 64.2 67.6 77.0 81.7 82.8 84.3 88.9 86.6 874 88.0 88.8 88.8 89.1 89.3 89.5GE 70i (4.5 67.8 77.7 82.8 83.-1 85.2 86.5 88.1 88.9 89.5 89.9 90.3 90.1 90.8 91.1GE 6001 68.9 68.2 78.2 83.1 88.0 86.1 87.6 89.3 90.0 90.7 91.1 91.1 91.6 9?.0 92.2

GE 5001 65.0 68.5 78.5 83.5 884. 86.5 88.4 90.0 90.8 91.14 91.8 92.2 92.6 93.0 93.2GE 4009 65.0 68.5 78.7 83.9 88.9 87.1 89. 5 91.4 92.5 93.8 93.9 98.3 98.6 95.0 95.8GE 3001 65.0 68.5 78.8 88.2 85.2 87.8 90.2 92.3 93.6 98.5 95.0 95.4 95.8 96.2 96.6GE 2001 65.0 68.5 78.8 84.2 85.2 87.4 93.5 92.8 94.3 95. 96.2 96.9 97.3 97.7 98.2GE 1001 65.0 68.5 78.8 84.2 85.2 87.4 90.5 93.0 94.

'4 95.5 96.3 97.1 97.8 97.8 100.0

GE ol 65.0 68.5 78.8 84.2 85.2 87.4 90.5 93.0 9414 95.5 96.3 97.1 97.4 97.8 100.0


-J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEAT1ER SERVICE/MAC


MONTH: MAR HOURSTLST): 0600-0800K .. .... ..... .. .. ... ....... ....... ... . .. ........ .. .... :" .MA .. .. .. !;.L.;;; ; .; ...CE IL ING

CEILINGVISIBILITY IN HUNDREDS OF MEYERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

0 FEET I 160 90 AD 60 48 40 32 2N 20 16 12 10 8 5 4 0............................ ........... ......................................................................................................

C)NO CElL 1 21.0 22.5 25.7 26.9 27.0 ZR .0 28.6 Z9.2 29.8 29.9 30.2 30.2 30.4 30.4 30.9

GE 200901 24. 3 26.:7 30.7 32.:7 33. 1 34. 35.6 36.:2 36. 9 37.:0 3 7.2 37.2 3 7.:5 3 7.5 37. 9C E 18AO 24.3 26.7 30.9 33.1 33.5 35.0 35.9 36.5 37.2 37.3 37.6 37.6 37.8 37.8 1A.

GE 160001 24.3 26.7 30.9 33.1 33.5 35.0 35.9 36.5 37.2 37.3 37.6 37.6 37.8 37.8 38.3GE 1410001 24.1 26.9 31.0 33.2 33.6 35.1 36.0 36.6 37.3 37.5 37.7 37.7 37.9 37.9 3A.4

OGE 120001 24.5 27.0 31.1 33.3 33.7 35.2 36.2 36.7 37.5 37.'6 37.8 37.B 38.0 311.0 38.5

GE 100001 26. 29:2 33.3 35.6 35.9 37.5 38.4 39.1 39.8 39.9 110.2 40.2 40.4 40.1 40.9GE coo0 27.1 29.6 33.7 35.9 36.3 37.8 38.8 39.5 40.2 40.3 40.S 40.5 40.8 40.8 41.2GE 8CO01 29.8 32.4 36.5 39.2 39.6 41.2 42.3 43.1 43.8 43.9 44.2 44.2 44.4 44.4 44.9GE ?cOol 30:.3 32.:9 37.3 '40.0 40.4 42.0 43.2 44.1 44.8 44.9 45.1 4S .2 4S.S 4S.5 45.9GE 60001 30.4f 33.0 37.5 40.2 40.5 42.2 43.3 44.2 44.9 4S.0 45.2 45.3 45.6 45.6 46.1

GE 50001 31.6 34.3 39.0 42.0 42.5 114.2 45.5 46.1 47.3 47.5 117.7 47.8 48.1 4R.1 48.5U E 45 00 1 32.9 35.9 41.0 44.1 44.5 46.3 47.7 48.6 49.9 50.1 50.3 50.6 51.2 5 1.4 51.8

GE 40001 36.3 39.8 44.9 48.2 48.6 50.41 51.8 53.0 54.4 54.7 54.9 55.2 55.8 55.9 56.4

G E 35001 38.% 42.3 48.2 52.2 52.8 54.7 56.2 57.5 58.9 59.1 59.4 S9.7 60.3 60.4 60.9" E 3000: 42.S 46.4 52.7 56.7 57.2 59.4 60.9 62.4 63.8 64.1 611.3 64.7 65.3 65.4 65.8

GE 25G01 1152 49.:1 55.:9 60.5 61.2 63.4 65:1 6 6.8 683 687 69:0 69:4 70:1 T':2 70. 7C'GE 2C001 47.1 51.1 58.3 63.0 63 .7 66. 68.2 69. 714 717 72.1 724 73.1 7 3.3 73.7

GE 1800I 47 .2 51 .2 58 .4 63 .1 63.8 6 6 .3 68 .3 7 0.0 71.5 71.8 72 .2 72 .6 73 .3 71. 4 73. 9GE 15001 49.9 53.9 62.2 67.3 68.1 70.9 73.0 74.8 76-3 76.7 77.0 77.5 78.2 7p.3 78.8

C)GE 12001 51.6 56.3 64.9 70.3 71.1 74.1 76.6 78.3 79.9 80).2 80.6 81.0 81.7 81.9 82.3

GE 1000 1 52:7 57.4 66:1 71:7 72:8 76.0 78:6 80.3 81.9 82:2 82:6 8.3. 83:7 83:9 84.* )GE 9001 53.1 58.3 66.8 72.6 736 76.8 795 81.3 82. 83.2 83.6 84. 85.0 85.2 856

GE 800 53.4 58.2 67 .0 1 .0 74.3 77.7 04, 82.3 83.9 84? 8 .7 85 o 8 6 6.e1 86 6 2 86.7GE 7001 53.7 58.5 68.2 74.3 75.7 79.5 82.6 84.6 86.2 86.8 87.4 88.0 88.8 8A.9 89.41 GE 6001 S3.8 58.9 68.6 74.8 76.2 80.1 83.9 86.0 87.6 88.2 8.8 0 9.4 90.2 9. 3 90.8

.E 56001 53.8 58.9 68.7 75.0 76.4 80.3 84.5 86.7 88.6 89.2 89.8 90.3 91.2 91.3 92.1GE 4001 53.8 58.9 68.7 75.0 76.4% 80.6 84.9 87.8 90.1 90.7 91.4 92.3 93.3 93.4 94.2GE 3001 53.8 58.9 68.7 75.0 76.4 80.6 8.08 87.9 90.7 91.3 92.5 93.5 95.1 95.5 96.9GE 2011 53.8 58.9 68.7 75.0 76.4 80.6 85.0 87.9 90.7 91.4 92.8 94.2 96.1 96.6 98.4GE I J01 53.8 58.9 68.7 75.0 76.'4 80.6 85.0 87.9 90.7 91.4 92.9 94.3 96.3 96.9 100.0

GE 5 I S3.8 58.9 68e.7 75.0 76.4 80.6 85.0 87.9 90.7 91.4 92.9 9%.3 96.3 96.9 100.0


) 0:qOJ 3• 59 9o ql qo 63 9, 86 9e 0l 50 06 5o 19 5

, -JJJ 63 36 99 00 66 50 |8 50 99 q7 50 52 50 59 50

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSA .E TA C FRMHOURLY OBSERVATIONS


STATION NUMBER: 015623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTI,: MA R H OURSILSTJ: 0900-1 1 D

C E I L ING VISIBILITY IN HUNDREDS OF M ETERSIN IGT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I160 90 60 60 48 - O 32 24. 20 16 1? 10 a 4 0........................................ ..........................................................................................

No CE L I 16.2 16.9 1A.? 20.4 20.5 20.9 21.4 21.5 21.7 21.7 21o8 21.8 21.9 21.9 21.9

GE 200001 22.2 23.3 25S 27.7 27.9 28.6 29.0 29.1 29.4 29.5 29.6 29.6 29.7 29.7 29.7GE 180001 22.2 23.3 25.5 27.7 27'.9 28.6 29.0 29.1 29.4 29.S 29.6 29.6 29.7 2 9.7 29.7GE 160001 22.2 23.3 25.5 27.7 27.9 ZB8.6 29.0 29.1 29.4 29.5 29.6 Z9.'6 29.7 29.7 29.7

G E 140001 22.4 23.5 25.8 27.9 28.1 2B .8 29.2 29.4 29.6 29.7 Z9,8 29.8 29.9 29.9 29.9O E 120001 22 9 24.2 26.5 26.7 26.9 29.6 30.0 30.1 30.4 30.5 3U.6 30.6 30.7 3 C.7 30.7

GE 100001 2S.1 26.3 28.9 31.3 31.5 32.2 3Z.6 32.7 33.0 33.1 33.2 33.2 33.3 33.3 33.3-GE 90001 26.0 27.2 29.9 32.3 32.75 33.2 33.6 33.7 34.0 34.1 34.2 34..2 34.3 34.3 34.3

GE 80001 30.1 31.7 314.4 37.0 37.3 38 .0 36.5 36.6 36.8 38.9 39.0 39.1 39.3 39.3 39.3GE 70001 '0.9 3Z.6 35.3 37.9 36.2 39.0 39.7 39.9 40.3 NO.4 40.5 40.6 40.7 4 C.7 40.7GE 60001 !1.0 32.7 35.4 36.0 36.4 39 .1 39.8 40.0 40.4 40.s 40.6 40.7 40.8 41~.8 40.6

-GE 50005 31.5 33.4 36.:3 39.:1 39. 6 40.4 41:.1 41.4 42:1 42.2 42:3 42:4 42.5 47. 5 42.5GE 45005 3 30 35.0 36.2 41.2 41. 42.5 4 3.2 4 3.5 44.2 44.3 4. 5 44.7 4. 0 4.GE 40005 37.3 39*.8 43 .S 46 .6 47.0a 48.0a 48 .? 49.0 4 9.7 50 .1 50.4 50'.5 50.8 50.8 50.8GE 35001 29.4 42.2 46.6 49.7 50.'3 51.3 52.1 52.41 53.2 53.7 54.0 54.1 54.4 54.4 54.4

ICGE 30001 43.6 46.5 51.4 54.9 55.6 57.0 58.0 56.5 59.3 59.8 60.2 60.3 60.6 6'.6 60.6

GE 25001 46.6 51.4 57.3 60.9 61.6 63.1 64.3 64.9 6iS.9 66.5 66.6 66.9 67.3 6 7.3 67.3C'GE 20GOI S2.1 55.1 61.3 65.0 65.'9 67.5 69.0 69.5 70.5 75.1 71.4 TI. 71.9 71.9 71.9

GE105 5.93: 21 656 D. 83 69.7 70:3 71.3 71.9 72:2 72.3 72.? 72 7 72:7GE 15005 1 55.9 59.4 66.6 706 71.6 73.5 75.1 75.7 76.7 ?77.3 177.6 77.7 78.1 79.1 78.1GE 1 2001 56 .3 62 .1 70.0 74.0 75.1 76.9 76.9 79.5 80.5 61.1 81.4 61.6 81.9 A 5.9 61.9

GE 10001 60.3 64.5 72.7 77.4 76.6 80.6 63.0 83.7 64.6 85.4 65.7 65.8 86.2 66.2 86.2oGE 9001 61.2 6S.5 74.0 76.7 80.2 A82.5 84.6 B5.5 86.6 87.? 67.5 87.6 88.0 89J.0 86.0GE 8001 61:8 66.1 75.0 80.1 61.6: . . 66 88. 80:5 689 69.0 89:3 693 9.GE 70 G 62. 66.7 756 81.2 62.9 85. 88.2 86.9 901 90. 91.1 91.2 91.6 91.6 91.6GE 6005 62.3 66.9 76.2 8t1.9 83.7 66.4 $9.S 90.2 91.6 92.2 92.6 92.7 93.0 9 3.0 93.0)

GE 50051 62.4 67.0 76.5 82.7 84.7 87.4 90.7 91.8 93.3 94.0 94.4 94.7 95.1 95.2 95.2GE 4005 62.5 67.2 76.7 62.9 64.9 87.9 91.6 92.9 94.4 9S.2 95.6 96.2 96.6 96.7 96.7GE 3001 62.5 67.2 76.7 82.9 65.0 68.0 91.7 93.3 94.7 95.7 96.3 97.1 97.6 97.9 98.0GE 2005 t2:5 67:2 76.7 62.9 85.0 68.3 91.7 93.5 94.9 96.:1 96:7 97.5 96:5 99:0 99:4GE 1 005 62.5 67.2 76.7 82.9 85.0 88. 91.7 93.5 9N9 96.1 96.7 97.5 98.5 99.1 10 00

GE o5 62.5 67.2 76.7 82.9 65.0 66.0 91.1 93.5 94.9 96.1 96.7 97.5 98.5 99.1 10C.0


m _ -L

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Of CEILING VERSUS VISIBILITYVSAFETAC FROM HOURLY OBSERVATIONSAIR WEATIER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: MAR HOURSILSTI: 1200-1400.. .. .. .. .. .. .. .. .. .. .. .. .. ;.. .. .... .. ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .... . ....... ..

CE ILING VISIBILITY IN HUNDREDS OF METERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

SFEET I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0... . . . .. . . ......• * o* * ! .. . . . . . . . . . . . . . . . . . . .... .. ... .. .. ... .. .. ... .... o . .. .*.0.. *.. .

o., NO CEIL I 16.6 17.4 18.2 19.1 19.1 19.2 19.4 19.6 19.6 19.6 19.6 19.6 19.6 19.6 19.6

GE 200001 22.6 24.0 25.9 27.0 27.0 27.3 27.4 27.6 27.7 27.7 27.7 27.7 27.7 27.7 27.7GE 180001 22.7 24.1 26.0 27.1 27.1 27.4 27.5 27.7 27.8 27.8 27.8 27.8 27.8 27.8 27.8GE 160001 22.7 24.1 26.'0 27.1 27;1 27.4 27.5 27.7 27.8 27.8 27.8 27.8 27.8 27.8 27.8GE 140001 2Z.9 24.3 26.2 2703 27.3 27.6 27.7 28.0 28.1 28.1 28.1 28.1 28.1 28.1 28.1GE 120001 23.1 29.5 26.5 27.5 27.5 27.8 28.0 28.2 28.3 28.3 28.3 28.3 2803 28.3 28.3

GE 100001 24.8 26.3 28.3 29.7 29. 30.0 30.1 30.3 30.4 300.4 30.4 30.4 30.4 303.4 30.4GE 90001 25.5 27.0 28.9 30.3 30.3 30.6 30.8 31.0 31.1 31.1 31.1 31..1 31.1 31.1 31.1GE 80001 28.2 29.8 31.9 33.5 33.5 33.9 34.0 34o2 34.3 34 .3 34o3 34.3 34.3 34.3 34.3GE 70001 297 31.6 33.9 35,5 35.5 35.8 36.0 36.2 36.3 36.3 36.3 36.3 36.3 36.3 36.3GE 6000 29.8 317 34.0 35.6 35.6 35.9 36.1 36.3 36.5 36.5 36.5 36.5 36.5 36.5 36.5

GE 5001 30.8 32.7 35.3 36.9 36.9 37. 2 37.4 37.6 37.7 37.7 37.7 37.7 7.7 37.7 37.7GE 4SO01 32.0 39.0 36.8 38.5 38.5 38.8 39.0 39.2 39.4 39.5 39.5 39.6 39.6 39.6 39.6GE 40001 37.2 39.6 42.5 44.3 114.3 44.7 44.9 45.2 45.3 45.4 45.4 45.5 45.5 45.5 45.SGE 35001 43.2 45.9 49.5 51.7 51.7 52.2 52.4 52.6 S2.7 52.8 52.8 52.9 S2.9 52.9 52.9

C GE 30001 54.1 57.2 61.2 63.5 63.5 64.0 64.2 64.4 69.5 64.6 64.6 6917 64.7 64.7 64.7

GE 25001 58.9 62.0 66.5 68.8 68.8 69.2 69.5 69.7 70.0 70.1 70.1 70.2 70.2 70.2 70.20 GE 20001 64.2 67.8 72.9 75.5 75.5 76.3 76.6 76.8 77.2 77.3 77.3 77.4 77.4 77.4 77.4

GE 18001 65.1 68.8 74.0 76.6 76.6 77.4 77.6 77.6 78.3 78.4 789.4 78.5 78.5 78.5 78.5GE IS00 69:2 73:3 79.5 82.4 82.4 83.2 83.4 83:7 89.2 84.3 89.9 84.5 8.5 84.3 84.5

- GE 120G1 12.2 76.3 82.9 86.3 86.6 87.6 88.1 88.3 88.9 89.0 89.1 89.2 89.2 89.2 89.2

GE 10001 73.4 77.7 85.1 88.6 89.41 90.6 91.2 91.4 92.0 92.2 92.3 92.4 92.4 92.4 92.4C" GE 9001 74.3 78.7 86.1 89.7 90.8 92.0 92.6 92.8 93,9 93.5 93.7 93*8 93.8 91.8 93.8

GE 8001 79.8 79.2 86.9 90.4 91.6 92.9 93.4 93.8 94.5 94.6 94.7 94.8 94.8 94.8 94.8GE 7001 75.5 80.2 88.0 91.7 93.1 99.5 95.1 95.7 96.5 96.6 96.7 96.8 96.8 96.8 96.6

" * Q GE 6001 75.6 80.3 88.2 92.4 9.1 95.6 96.5 97.3 °96.1 98.2 98.3 98.4 98.4* 98.4 98.4*GE 6001 75.6 80.3 88.2 92.4 94.1 95.7 96.7 97.7 98.9 99.0 9 99.2 992 99. 992

* C. GE S0o 75.6 80.3 88.3 92.5 94.1 96.1 97. 98.2 99.4 99.6 99.7 99.8 99.8 99.8 99.8GE 3001 75.6 80.3 88.3 92.5 94.4 96.1 97.1 98.2 99.4 99.6 99.7 99.8 99.9 99.9 99.9GE 2001 7S.6 80.3 88.3 92.5 94.4 96.1 97.1 98.2 99.9 997 99.8 999 10090 109.0 100.0

*-I) GE 1001 15.6 80.3 88.3 92.5 94.4 96.1 97.1 98.2 99.4 99.7 99.8 99.9 100.0 10l.0 100.0

GE 01 15.6 80.3 88.3 92.5 94.4 96.1 97.1 98.2 99.4 99.7 99.8 99.9 100.0 100.0 100.0

....................................................................................................................................................


.1

--

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Of CEILING VERSUS VISIBILITYUSAFETAC FROM 1OU9LY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGOOM PERIOD OF RECORD: TA-87

MONTH: MAR HOURS(LST): 150C-1700.. .. .. .. .. .. .. .. .. .. .. .. .. ."... .. .. .. .. .. .... .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. .. .. .CE ILING. VISIBILITY IN LNOREOS OF METERS

IN | 61 GE 6E GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 60 60 48 40 32 24 20 16 12 10 a S 4 0

NO CEIL J 19.5 19.7 2L.1 zt.4 21.4 21.4 21.4 22.4 21.4 21.4 21.4 21.4 21.4 2 1.4 21.4

GE 200001 27.2 27.8 29.3 29.5 29.6 29.6 29.8 29.8 30.2 3n.2 30.2 30.2 30.2 3s.2 30.2GE 180001 27.5 28.1 29.6 29.8 29.9 29.9 30.2 30.2 30.5 3r.5 30.5 30.5 30.5 3n.5 30.5GE 160001 27.5 28.3 29.6 29.8 29.9 29.9 30.2 30.2 30.5 30.5 30.5 30.5 30.5 3n.5 30.5GE 140001 27.7 28.2 29.7 29.9 30.0 30.0 30.3 30.3 30.6 30.6 30.6 30.6 30.6 3.r.6 30.6GE 120001 28.0 28.6 30.2 30.4 30.5 30.5 30.7 30.7 31.0 31.0 31.0 31.0 31.0 31.0 31.0

GE 100001 30.0 30.7 32,3 32.6 32.8 32.8 33.0 33.0 33.3 33.3 33.3 33.3 33.3 33.3 33.3o GE 90001 31.0 31.7 33.4 33.7 34.1 34.1 34.3 34.3 34.6 34.6 34.6 34.6 34.6 34.6 34.6

GE 80001 34.8 35.5 37.4 37.7 38.1 38.1 38.3 38.3 38.6 38.6 38.6 38.6 38.6 38.6 38.6

GE 70001 36.1 37.0 39.2 39.5 39.8 39.8 40.0 4 0.0 40.3 40.3 40.3 40.3 40.3 403.3 40.3GE 60001 16.1 37.0 39.2 39.5 39.8 39.8 40.0 40.0 40.3 40.3 40.3 40.3 40.3 l0.3 40.3

GE 5000! 38.7 39.6 42.0 42.5 42;8 42.8 43.1 43.1 43.4 43.4 43.4 43.4 43.4 43.4 43.4o G 4500 42.0 42.8 45.b 46.1 44 e46 .4 46.6 46.6 47.0 47.0 47.0 47.0 47.0 47e0 47.0

GE 400O 49.3 50.7 53.7 54.7 55.0( 55.0 55.2 55.2 55.5 55.5 55.5 55.5 SS.5 55.5 5.5GE 35001 56.7 58.7 61.8 62.9 63.2 63.2 63.6 63.6 63.9 63.9 63.9 63.9 63.9 63.9 63.9GE 30u0 64.0 66.5 69.8 71.0 71.'4 71 .4 71.7 71.7 72.0 72.0 72.0 72.3 72.0 72.0 72,0

GE 25001 67.7 70.9 75.4 76.6 76.9 76.9 77.3 77.4 71.9 77.9 77.9 77.9 77.9 77.9 77.9GE 20001 73.5 77.1 82.8 84.2 84.5 84-8 85.2 85.4 t58 85.8 85.8 85. 85.8 85.8 85.8GE 18001 73.5 77.1 83.0 84.4 84.7 85.0 85.5 85.6 86;0 86.0 86.0 86.0 86.0 86.0 86.0GE 15001 75.1 78.9 86.4 88.2 88.9 89.3 89.7 89.9 90.3 90.3 90.3 93.3 90.3 90.3 90.3GE 12001 76.9 80.8 89.0 91.0 92.1 92.4 93.1 93.5 93.9 93.9 93.9 93.9 93.9 93.9 93.9

GE 10009 77.9 81.9 90.2 92.3 93.5 94.3 95.2 95.7 96.2 96.2 96.2 96.2 96.2 96.2 96.2GE 9001 78.0 82.0 90.6 92.6 93.8 94.7 95.7 96.1 96.6 96.6 96.6 96.6 96.6 96.6 96.6GE 800l 78.1 82.2 90.8 93.0 94.1 95.0 96.0 96.5 97.1 97.1 97.1 97.1 97.1 97.1 97.1GE 700 78.3 82.6 91.3 93.5 94.8 95.7 97.1 97.9 , 98.5 98.5 98.5 98.7 98.7 96.7 98.7

GE 6009 78.4 82.8 91.4 93.7 95.0 95.9 97.4 98.3 98.8 98.8 98.8 99.0 99.0 99.0 99.0

GE soul 78.4 02.8 91.4 93.8 95.1 96.1 97.6 98.6 99.1 99.1 99.1 99.3 99,5 99.5 99.5

GE 4001 78.4 82.8 91.4 93.8 95.1 96.1 97.6 98.6 99.2 99.2 99.3 99.6 99.7 99.7 99.?GE 3001 78.4 82.8 91*4 93,9 95.2 96.2 97*7 98.8 99.6 99.6 99,7 99,9 100 10.0 100.0GE 2009 78.4 82.8 91.4 93.9 95.2 96.2 97.7 98.8 99.6 99.6 99.7 99.9 103.0 100.0 100.0

GE 10uo 78.4 82.8 91.4 93.9 95.2 96.2 97.7 98.8 99.6 99.6 99.7 99.9 100.0 100.0 100.0

GE 0a 78.4 82.8 91.4 93.9 95.2 96.2 97.7 98.8 99.6 99.6 99.7 99.9 1r0.0 100.0 100.0

TOTAL NPUBER OF 0SRVATIONS: 922

Ii. LC

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Of OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOUqLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF aLCONBURY UNITED KINGDOM PERIOD OF RECORO: 78-87

MONTH: .AR HOURSfLST: I80C-2G00" "; . . . ... .. . . . . .. . .... .. ............. .......CEL NGVISIBILITY IN HUNDREDS OF METERS

IN I 61 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

Th FEET I 160 90 80 60 48 NO 32 24 20 16 12 10 8 5 N 0

NO CEIL 1 28.1 29.6 30.3 31.4 31.4 31.5 31.5 31. 5 31 315 31.5 31.5 31.5 31.5 31.5

GE 200001 32.7 34.6 35.8 37.0 37.0 37.2 37.2 37.2 37.3 37.5 37.5 37.5 3T.5 37.5 31.5

" GE 180001 33.0 34.9 36.0 37.3 37.3 37 .4 37.4 37.4 37.5 37.8 37.8 37.8 37.8 37.8 37.8

GE 160001 33.0 3490 36.0 37.3 37.3 37 o4 37.4 37.4 37.5 37.8 37.8 37.8 37.8 37.8 37.8GE 140001 13.2 35.1 36.3 37.5 37.5 37.7 37.7 37.7 37.8 38.1 38 , 1 38.1 38.1 38ol 38.1GE 120001 33.9 35.8 37.0 38.3 38o3 38 .4 38.4 38.4 38.6 38.8 38.8 38.8 38.8 39.8 38.8

GE 100001 IS:5 37:4 38.7 39.9 39.9 40.1 40.1 40.1 40.2 4n.5 40.5 40.5 40.5 40.5 40.5

GE 90P01 36.2 38.1 39.3 40:7 4O8 410 41.0 41.2 41.3 41.6 41.6 41.6 41.6 41.6 41.6

GE 80001 39.7 42.1 43.4 44.9 45.0 45.4 45.4 45.6 4S.8 46.0 46.0 46.0 46.0 46.0 46.0GE 713001 41.0 43.6 44 .9 46.4 46.S 47.0 47.0 47.3 47.4 47.7 47.7 47.7 47.7 47.7 4707GE 63001 41.1 43.7 45.0 46.5 4"6.6 47.2 47.2 47.4 47.5 47.8 47,8 47.8 47.8 47.8 47.8

GE 50001 42.4 45.3 46.8 48.3 48,q 48.9 48.9 49.2 49.3 49o6 49.6 49.6 49o6 49.6 49.6GE 45001 44.9 47.8 49.3 53.8 50.9 51.6 51.6 51.8 52.0 52.2 52.2 52o2 S2.2 52.2 52.2

GE 40001 50.2 53.6 55.8 58.0 58.2 58.8 58.8 59.0 59.2 59.4 59.4 59.4 59.4 59.4 59.4GE 35001 56.4 60.3 62.6 64.9 6s.o 6S.6 66.0 66.2 66.4 66.6 66.6 66.6 66.6 66.6 66.6

C GE 30001 63.2 67 5 70.4 72.7 72.8 73.8 74o2 74.5 74 '6 74.8 74.8 74.8 74.8 74.8 74.8

GE 25001 66:2 71.2 74:6 77:1 77:2 78.4 79.0 79.3 79.4 79.6 79:6 79.6 79.6 79.6 79.6GE 20001 69.7 75.2 79.4 82.4 82.6 84.2 8q8 85.1 85.2 8S.s 8s.5 85.5 85.5 85s 85.5GE 18fia 69.9 75.6 80.3 83.3 83.4 85.1 85.8 86.1 86.5 86.7 86.7 86.7 86.7 86.7 86.7

GE 15001 71:7 77.7 82:9 86.3 86.6 88.2 89.0 89.5 89.9 91-1 90.1 90.1 90.1 9c.1 90.1) .E 12001 72.6 78.9 84.6 88.6 89.0 91.2 92.3 92.8 93.4 93.9 93.9 93.9 93.9 9 .9 93.9

GE lCLIOl 73.3 80:3 86.5 90.6 91.0 93.2 9S4.8 95.3 96:2 96.7 96.7 96.7 96.7 96.7 96.70 GE 9001 73.3 80.3 86.5 90.8 91.3 93.4 95.1 95.6 96.5 97.0 97.0 97.0 97.0 97.0 97.0

GE 8001 73.5 80.4 86.6 91.0 91.5 93.7 95.3 95.8 96.7 97.2 97.3 97.3 97.3 97.3 97.3GE 7o0I 73.6 80.5 86.9 91.3 91.8 99 .1 96.1 96.8 97.7 98.2 98.4 98.4 98.4 9 4.4 98.4GE 6001 73.7 80.9 87.4 91.8 92.3 94.6 96.7 97.6 98.5 99.0 99.1 99.1 99.1 99.1 99.1

GE 5001 73.8 81.0 87.6 92.3 92.8 9S1 97.2 98:1 "99.1 99.6 99.7 99.7 99 997 99.70 GE 401u 73.8 81.0 87.6 92.3 92.8 95.1 97.2 98.1 99.1 99.6 99.7 99.7 99.7 99 7 99.7

GE 3001 73.8 81.0 87.6 92.3 92.8 95.1 97.3 98.2 99.4 99.9 100.0 100.0 100.0 13C.0 100.0

GE 2001 13.8 81.0 87.6 92.3 92.8 95.3 97.3 98.2 99.4 99.9 100.0 100.0 100.0 1OR.0 100.0GE 1001 73.8 81.0 87.6 92.3 92.8 95.1 97.3 98.2 99.4 99.9 100.0 100.0 100.0 1U.0 100.0

GE 31 73.8 81.0 87.6 92.3 92.8 95.1 97.3 98.2 99.4 99.9 100.0 100.1 100.0 103.0 100.0

..............................................................................................................................................

TOTAL NUMBER OF OBSERvATIONS: 791

J

• I



STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTP: MAR HOURSILSII: 210"-23,0

.. . ....................................... 0......... ...............................................

CEILING VISIBILITY IN HUNDREDS OF METERSIN J GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 N8 4D 32 24 20 16 12 10 8 5 0 0

NO CEIL i 35.6 36.0 37.5 39.0 39.2 39.5 39.6 39.8 39.8 39.8 40.1 N.1 90.1 N 3.1 NO.2

GE 200001 38.3 39.5 40,6 N2.2 12.5 N2.9 N3.1 43.2 93.2 43.6 43.9 93..9 93.9 93.9 44.0

GE 180001 38.4 39.6 40.7 92.9 92.6 93.1 93.2 N43.3 43.3 103.7 44.0 99.0 99.0 94.0 99.1

GE 160001 3B.4 39.6 90.7 92.9 92.6 93.1 93.2 43.3 93.3 43.7 99.0 11.0 99.0 44.0 99.1GE 14l601 38.6 39.8 90.9 92.5 42.8 93.2 N03.3 93.5 93.5 43.9 44.1 49.1 99.1 99.1 49.3GE 12001 39.0 0O.2 1.3 12.9 N3.2 93.6 43.7 1N3.9 83.9 44.3 44.6 44.6 44.6 44.6 4N.7

GE 100001 90.1 91.3 92.5 99.1 44.9 91.8 95.0 95. 1 95.1 45.5 95.8 95.8 95.8 9 ,.8 95.9GE 900o0 90.5 91.7 92.9 99.6 99.8 95.2 95.9 95.5 95.5 9-5.9 96.2 96..2 96.2 96.2 96.3

GE 80001 91.8 93.6 95.1 97.3 97.5 NA.0 A.1 .8.2 N8.2 98.6 48.9 98.9 N8.9 9.9 99.0

GE 70001 92.5 99.3 45.8 48.0 N8.2 48.6 98.8 98.9 98.9 99.3 99.6 49.6 99.6 49.6 49.7GE 61001 42.6 499.9 95.9 108.1 98.9 98.8 98.9 49.f 19.0 49.5 99.7 99.,7 19.7 99.7 99.9

GE 5OUl 99.8 96.7 98.9 50.5 50.8 51.2 51.9 51.5 51.5 51.9 52.2 52.2 S2.2 52.? 52.3GE 4S(101 96.3 98.2 50.0 52.2 52.5 S2.9 53.0 53.1 53.1 53.5 53.8 53.8 53.8 53.8 59.0GE 90001 51.9 59.5 57.1 59.8 60.1 60.5 60.B 60.9 60.9 61.3 61.6 61.6 61.7 61.7 61.9GE 35001 55.9 58.3 61.0 69.2 69.9 61.9 65.1 6S.3 65.3 65.7 65.9 6509 66.1 66.1 66.2

GE 30001 60.9 63.8 67.9 71.0 71.3 71.9 72.8 72.9 73.0 73.9 73.7 73.7 73.8 7 3.8 79.u

GE 25C&OI 62.9 65:9 70.1 79.3 79..5 75.3 76.2 76.3 76.9 76.8 77.1 77.1 77.2 77.2 77.4

GE 2000 65.8 69.9 75.1 79.3 79.6 80.9 91.2 81.3 81.9 82.3 82.6 82.6 82.7 82.7 82.8GE 18001 66.2 70.3 75.5 79.7 80.0 80.9 81.6 81.7 82.3 82.7 83.0 83.0 83.1 8!.l 83.2GE 15001 69.6 79.1 79.8 89.3 89.6 85.7 86.6 86.8 87.3 87.7 98.0 88.0 98.1 89.1 88.3GE 12001 70.9 75.2 81.5 86.1 86.9 87.7 88.8 89.1 89.6 9(7.1 90.3 90.3 90.5 90.5 90.6

GE 10001 71.8 77.0 83.9 68.6 88.8 90.2 91.7 92.1 92.8 93.2 93.5 93.5 93.6 9 Y.6 93.7

GE 9001 72.6 77.8 89.7 89.9 89.6 91.0 92.5 92.9 93.6 91.0 99.3 99.3 99.9 99.9 99.bGE 8001 72.6 77.9 89.9 89.5 89."8 91.3 92.8 93.3 99.3 99.8 95.1 95.1 95.2 95.2 9S.9

:GE 701 13.2 78.7 85:7 90.3 90.6 92.1 93.9 99.6 95.5 96.0 96.3 96.3 96.5 96.5 96.6GE 600 73.7 79.3 86.1 91.1 91.9 93.1 99.8 95.5 96.5 97.0 97.3 97.3 97.4 97.9 97.5

GE SoD 73.7 79.3 86.5 91.9 91.7 93.5 95.5 96.2 97.1 97.7 98.2 98.2 98.9 98.9 98.5GE 9001 73.7 79.3 86.5 91.9 91.7 93.6 95.8 96.5 97.5 98ol 98.6 98.6 98.8 99.8 98.9

GE 3Tol 73.7 79.3 86.5 91.9 91.7 93.6 96.0 96.9 98.0 98.9 99.5 99.5 99.7 99.7 99.9GE 2001 73.7 79.3 86.5 91.9 91.7 93.6 96.0 96.9 98.0 99.0 99.6 99.6 99.9 99.9 100.0GE oo 73.7 79.3 86.5 919 91.7 93.6 96.0 96.9 98 0 99.0 99.6 99.6 99.9 99.9 100.0

GE uI 73.7 79.3 86.5 91.9 91.7 93.6 96.0 96.9 98.0 99.0 99.6 99.6 99.9 99.9 10C.O...................................... .................................................................... ...............................

TOTAL NUMBER OF OBSERVATIONS: 73N

--o


A [R WEATHER SERVICEf/AC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURT UNITED KRINGOOM PERIOD OF RECORD: 78-87MONTIH: MAR HOURSILSTI: ALL

... .... ...... .... "00 0" "0 ' . ..00 0 ' ;;; ;:I ; . ... ... ;, 0;; 0 ; ;; ; .. . .... ...0.0.0" 0""CE IL 1N5 VSBLTIN H UNOREO FMTR

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET 1 160 90 80 60 98 40 32 29 20 16 12 10 8 5 4 0

NO CEIL I 23.7 24.9 26.7 27.8 28.0 28.9 28.7 29.0 29.1 29.2 29.3 29.3 29.4 29.4 29.5

GE 200001 280.3 29.9 32.2 33.7 33.9 39.5 34.8 35.1 35.' 35.6 35.7 35.7 35.8 35.8 35.9GE 180001 28.9 30.0 32.09 33.9 34.1 39.7 35.0 35.3 35.6 35.8 35.9 35.9 36.0 36.0 36.1

GE 160001 28.9 30.0 32.' 33.9 39.'1 39 .7 35.0 35.3 35.6 35.8 35.9 35.9 36.0 36.0 36.1GE 190001 28.6 30.2 32.6 39.0 39.2 34.9 35.2 35.5 35.8 35.9 36.0 36.1 36.1 36.2 36.3GE 12C031 29.0 30.6 33.0 34.5 39.7 35.3 35.6 35.9 36.2 36.9 36.5 36.5 36.6 36.6 36.7

GE 100001 30.6 32.2 39.7 36.3 36.5 37.1 3?.9 37.8 38.1 38.2 38.3 38.9 38.9 38.5 38.6GE 90001 31.2 32.9 35.4 37.0 37.3 37.9 38.2 38.6 38.9 39.0 39.1 39.2 39.3 39.3 39.9GE SOGUJ 30.0 35.9 38.5 90.9 90.6 91.3 911.6 92.0 92.3 92.5 92.6 92.'7 92.8 9 2.8 92.9

GE 7C00 38.9 36.9 39o6 9.1.4 91.7 92.9 92.8 93.2 93.6 43.7 93.8 9 3."9 9.03 99.0 99.1G GE 60001 35.0 37.0 39.7 41.S 9.1.8 92.5 92.9 93.3 93.6 93.8 83.9 981.0 994.1 94.1 99.2

GE 50001 3.3 38.9 .1o5 93.5 93.8 99.5 98.9 45.3 95.7 95.9 86.0 466.1 9.2 96.2 46.3

GE 4 jI 38.2 0.9 93.7 95.8 96.1 966.8 9*7.3 97.7 98.2 88.9 468.5 98.6 98.8 4808 98.9GE 90001 3.9 96.0 99.8 52.2 52.5 53.3 53.7 59.2 54'.7 55.0 SS.2 55.3 55.5 5.S 55.6

GE 35001 97.8 50.8 5S.0 57.7 58.0 58.8 59.9 59.9 60.5 61.8 60.9 61.1 61.3 61.3 61.9

GE 3OOl S3.9 51.1 61.9 64.8 65.1 66.2 66.8 67.9 68.0 68.3 68.5 68.6 68.8 6A.8 69.0

GE 25001 57.3 60.9 66.2 69.4 69.6 70.9 71.7 72.3 73.0 73.4 73.5 73.7 73.9 73.9 74.0

(7 GE 2010 60.7 69.7 70.6 78.0 78.8 75.8 76.6 77.3 78.0 78.9 78.6 78.1 78.9 79.0 79.1

GE 18001 61.2 65.2 71.2 74.6 75.1 76.9 77.3 77.9 78.7 79.1 79.2 79.4 T9.6 79.6 79.8

GE 15011 68.1 68.3 75.3 79:0 79, 6 81.0 82.0 82.7 83.6 83.9 89.1 8903 A%.5 89.6 89.7

O GE 120(1 65.8 70.3 77.8 81.8 82.8 89.1 8S.2 86.0 86.9 87.3 87.5 87.7 87.9 87.9 88.0

GE 11009 67:1 71.8 79.7 83.9 89.7 86.5 88.0 88.9 89.9 90.2 90 . 90.6 90.8 9%'.9 91.0

GE 9009 67.7 72. 5 80. 8.7 85.7 87.5 69.0 89.9 90.9 91.3 91.5 91.7 91.9 92.0 92.1GE 80 68.0 72.9 80.9 85.3 86.'3 88.2 89.7 90.7 91.7 92.1 9 .8 92.5 92.8 92.8 92.9

GE 7001 68.3 73.3 81.7 86.1 87.3 89.3 91.1 92.3 93.3 93.9 94.0 991.2 94.5 99.5 94.6

C GE 6061 68.5 73.6 82.0 86.7 87.9 90.0 92.1 93.3 99.8 99.8 95.1 95.3 95-6 95.6 9S.7

GE 5001 68.6 73.7 82.2 87.0 88.2 90.91 92.7 99.0 95.2 95.7 96.0 96.2 96.5 96.6 96.8GE 0L 09 60.6 73.7 82.3 87.1 88.8 90.7 93.1 99.6 96.0 96.5 96.8 97.2 97.5 97.6 97.8GE 3001 68.6 73.7 82.3 87.1 88.9 90.8 93.3 99.9 96.,4 97.0 97.8 97.8 98.3 99.5 98.7

GE 2001 68.6 73.7 82.3 87.1 88.8 90.8 93.9 95.0 96.5 97.2 97,7 98.2 98.8 99.0 99.4

GE IO1 68.6 73.7 82.3 87.1 88.9 90.8 93.4 95.(4 96.5 97.2 97.8 98.3 98.9 99,. 1C000

GE iJ 68.6 73.7 82.3 87.1 88. 90.8 93.9 95.c 96.5 97.2 97.8 98.3 98.9 99.3 100.0

.......................................................................................................................................


GLOBAL CLIMATOLOGY BRANCH PERCENT.AGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYuSAFETAC FROM HOURLY OBSERVATIONSAIR WEATPER SERvICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-63;15787MONTH: APR HOUR tS I: 0001-0200

CEILING VISIBILITY IN HUNDREDS O METERSIN GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEo FEET I 160 90 s0 60 4A 40 32 24 20 16 1? 10 8 5 4 012oo 10 e8 5 o

O NO CEIL I 33.1 35.1 39.0 40.5 41.0 41.3 '12.1 42.1 42.6 42.8 42.8 42.8 42.8 42.8 42.8

GE 200001 !5.1 5 7.:4 41.3 836 44.1 145 .1 45.9 45.9 46.4 46.7 46.7 46.7 46.7 46.7 46.7o GE 180001 35.1 374 41.3 413.6 44.1 45.1 45.9 45.9 46.4 46.7 46.7 46. 46.7 46.7 46.7GE 160001 35.1 37.4 41.3 43.6 14.1 45.1 45.9 45.9 46.4 46.7 46.7 46.7 46.7 46.7 46. 7G'E 140001 35.6 37.9 41.8 04.1 44.6 45.6 46.4 46.4 46.9 47.2 47.2 47.2 47.2 47.2 47.2GE 120001 36.2 38.5 42.3 44.6 45.1 46.2 46.9 46.9 47.4 47.7 47.7 47.7 47.7 ".7.7 47.7

GE 100001 37.9 40.3 44.1 46.4 816.9 48.2 49.0 49.0 49.5 49.7 49.7 49.7 49.7 49.7 49.7GE 90001 38.2 40.5 44.4 46.7 '.7.o2 48.5 49.2 49.2 49.7 50.0 50.0 50.0 50.0 50.0 50.0GE 80001 40.0 42.6 46.4 49.0 49.S 50.8 51.5 51.5 52.3 52.6 52.6 52.6 %2.6 52.6 52.6GE 70001 40.8 43.3 47.4 50.0 5ir.5 51.8 52.6 52.6 53.3 53.6 53.6 53.6 S3.6 53.6 53.6GE 60001 41.0 43.8 47.9 50.5 51.0 52.3 53.1 53.1 53.8 54.1 54.1 54 . 1 54.1 54.1 54.1

GE 50001 42.6 46.9 51.3 53.8 54.6 56.2 56.9 56.9 57.7 57.9 57.9 57.9 57.9 S7.9 57.9GE 45001 46.2 50.5 55.6 58.2 59;0 60.5 61.3 61.3 62.1 62.3 62.3 62.3 62.3 62.3 62.3GE 60001 52.6 57.2 62.8 65.6 66.4 69.0 69.7 69.7 70.S 70.8 70.8 70.8 70.8 70.8 70.8GE 35001 55.6 60.5 66.2 69.0 69.7 72.3 73.1 73.1 73.9 74.1 74.1 74.1 74.1 74.1 74.1GE 30001 59.0 64. 70.0 72.8 73.6 76.7 77.4 77.4 78.2 78.S 76.5 78.5 78.5 76.5 78.5

GE 25001 60.8 66.2 72.1 75.o 75.9 79.0 79.7 79.7 80.S 80.8 80.6 80.8 80.8 .8 .8 8C.8GE 20001 64.1 70.5 76.7 80.5 61.5 84.6 85.4 85.4 86.2 86.4 86.' 86. 860.4 86.4 86.4GE 18001 64.1 70.5 76.7 80.5 81.5 84.6 85.4 85.4 86.2 86.4 86.8 86.4 86.4 86.4 86.4111E 15001 67.2 73.6 80.0 83.8 84.9 87.9 88.7 88.7 09.5 89.7 89.7 89.7 89.7 89,7 89.7GE 17001 68.2 75.1 81.5 85.4 86. 4 89.5 90.3 90.3 91.0 91.3 91.3 91.3 91.3 91.3 91.3

G E 10001 69.7 76:9 83.6 87.4 88.5 91.5 92:3 92,3 93.1 93.3 93.3 93.3 93.3 93.3 93.3GE 900 69.7 76.9 63.6 87.4 88.5 91.5 92.3 9Z.1 93ol 93.3 93.3 93.3 93.3 93.3 93.3GE SGI 70,0 77.2 63.8 87.7 88.7 91.8 92,6 92,6 93.3 93.6 93,6 93.6 93.6 93.6 93.6GE 7001 70.3 77.4 84.1 87.9 89.0 92.1 92.8 92.8 93.6 93.8 93 .93.8 1308 93.8 93.6GE 6001 70,5 77.7 846 88.7 89.7 93.1 93.8 93.8 94.6 94.9 94.9 94.9 94.9 94.9 94.9

GE SuDOl 71.0 78.2 65.1 90.0 91.0 94.4 95.1 95.1 95.9 96.2 96.2 96.2 96.2 96.2 96.2GE 4001 71.0 78.5 85.4 91.0 92,3 95.6 96.7 96.7 97.4 97.7 97.7 97.7 97.9 97.9 97.9GE 3.01 71.0 78.5 85.6 91.5 92.8 96.2 97.2 97.2 97.9 98.2 98.2 98.2 98.5 98.5 98.5GE 2001 71.0 78.5 85.6 91.5 92.8 96.4 97.7 97.9 98.7 9Q.0 99,0 99.0 99.2 99.2 100.0GE 1001 71.0 78.5 8S.6 91,5 92.6 96.4 97.7 97.9 98.7 99,0 99,0 99.0 99.2 99.2 100.0

GE ol 71.0 78.5 85.6 91.5 92.8 96.4 97.7 97.9 98.7 99,0 9900 99 0 99 2 99.2 100.O


L ok_

)GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILI

TY

USAFETAC FROM 14OURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME. RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87

MONTH: APR HOURS1LSI: 033'J-00n.. ....... .. .. ............ ............... .. . .......,,. ........ ....... ........ .......CE IL ING VISIBILITY IN H~UNDREDS 0F METERS

IN I 61 GE GE GE GE GE GE GE GE GE RE GE GE GE GE GEFE E1 160 90 O 60 8 90 32 24 20 16 12 10 a 5 0

NO CEIL I 24.N 26.0 29.N 30.6 31.2 32.6 33.6 3N.1 39.9 35.2 35.2 35.2 35.3 35.3 35.6

GE 200001 27T. 29.2 33.2 39.9 S35. 37.1 38.9 38.8 39.7 NO.0 N0.3 0O.5 N0.6 4 1.6 N0.9GE 180001 27.7 29.5 33.5 35.2 35.8 37 .4 38.7 39.1 40.C 49.3 40.6 N0.8 40.9 9 0.9 N1.2GE 160001 27.7 29.5 33.S 35.2 35.8 37.9 38.7 39.1 NO.0 N0.3 4O.6 N0.8 90.9 N0.9 N1.2GE 140001 28.0 29.8 33.8 3S.5 36.1 37.7 39.0 39.4 40.3 40.6 40.9 N1.1 N1.2 N1.2 N1.6

GE 120001 28.0 Z9.8 33.8 35.5 36.1 37.7 39.0 39.4 o0.3 4O.6 N0.9 NI.1 N1.z NI.2 N1.6

GE 100G.3I 29.2 31;2 3S.S 37.3 37.9 N0.0 N1.2 Ni1.7 42.6 NZ.9 NI.2 93.N 43.5 N 3.5 N 3.8GE 90001 29.8 31.B 36.1 37.9 38.'s N0.8 92.0 N2 .6 N3;5 N3.8 44.1 NN.3 NN.N N .N 44.7GE 80001 32.1 39.2 38.8 NO.6 91.2 43.5 99.7 N5. 46.7 97.2 N7.5 9T.6 NT.8 4 '.8 N8.16E 70001 32.6 39.7 39.6 NI .4 92.0 99.3 95.5 96.1 N7.5 N7.9 40.2 98.9 N8.6 98.6 48.9

GE 600ol 32.6 39.9 39.7 91.6 92.2 99.6 9S.8 96.6 9749 98.9 98.7 N8.9 49.0 99.0 N9.3

GE 50001 35.2 38.1 9.0 95.8 96.9 N9.6 51.9 52.2 53.6 5.O 59.3 5.5 59.6 59.6 59.9GE 9SO0 37.6 90.9 97.9 50.1 50.7 S9.3 56.3 57.1 58.6 59.1 59.9 59.S 59.7 Sq.7 60.0GE 00| 92.0 95.5 53.3 55.9 56.6 60.9 62.6 63.3 69.8 65.3 65.6 65.8 65.9 65.9 66.2

GE 35001 99.9 98.2 56.2 58.8 59.5 63.S 65.9 66.7 68.2 68.6 68.9 69.1 69.3 6. 3 69.7GE 30GOI 47.0 51.0 59.4 62.9 63.2 67.6 70.2 71.2 72.9 73.9 73.7 73.8 79.0 79.0 79.9

GE 2S001 99.6 53.7 62.1 65.3 66.1 70.8 73.9 79.b 76.3 76.7 77.0 77.2 77.3 77.3 77.8GE 20001 51.6 55.9 69.9 67.9 68.6 73.9 76.0 71.2 78.8 79.3 79.6 79.8 79.9 79.9 80.9

GE 1eGOI 52.1 56.3 69.8 68.3 69.1 73.8 76.9 77.6 79.3 79.8 80.1 80.2 93.9 87.9 80.8GE 15001 S.2 s.8 67.6 71.2 72.1 76.9 79.5 8g.7 82.3 82.8 83.1 83.3 83.9 83.9 83.9GE 12061 55.7 60.3 69.7 73.5 79.9 79.1 82.0 83.3 89.9 8S. 85.7 85.8 86.0 86.0 AN.S

GE 10001 57.9 61.9 71.7 75.8 76.9 81.6 89.6 86.0 87.8 88.3 8.b6 88.7 88.9 68.9 89.5GE 9001 57.8 62.1 12.1 76.3 77.3 82.0 S.2 B6.S 88.6 89.0 89.3 89.S 89.6 89.b 90.3GE s8Ol 58.1 62.7 72.8 76.9 77.9 82.6 86.0 87.2 89.3 89.8 90.1 90.3 90.9 90.9 91.0GE 7001 58.6 63.3 73.8 78.1 79.1 83.9 87.2 88.9 90.6 91.0 91.3 91.S 91.6 91.6 92.2

GE 6001 58.9 63.6 79.9 79.1 80.2 89.9 88.3 89.S 91.6 92.1 92.9 92.5 92.7 92.7 93.3

GE Soul 59.9 69.7 75.5 80.2 81.3 86.0 89.3 90.7 93.0 93.5 93.8 93.9 99.1 99.1 99.7

GE %l90 59.91 69.7 76.0 80.8 81.9 86.6 90.6 92.1 99.S 95.3 95.3 95.9 95.6 9r.6 96.2GE o S9.10 69.7 76.0 80.8 82.0 86.8 91.0 92.5 95.3 9S. 96.0 96.2 96.3 96.3 97.0GE 2001 59.4 69.7 76.0 80.8 82.0 86.8 91.2 93.2 96.3 9.1 97.9 97.6 97.7 97.7 99.96G tool 59.9 691.7 76.0 80.8 82.0 86.8 91.2 93.2 96.3 97.1 97.9 97.6 97.9 97.9 99.7

GE 01 59. 69.7 76.0 80.8 82.0 86.4 91.2 93.2 96. 3 97.1 97.4 97.6 97.9 91.9 100.0

.................................................................................................................................................

TOTAL NOUM4BER OF OBSERVATIONS: 6S7

_)

I

* GLOBAL CLIMATOLOGV BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM POUgLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 76-83,@S-87

MONTI: APR HOURS(LSTI: 0601-0800.. .. . .. ... .. ... ... . .. .. ... ... ... .. ... ... ... .. ... ... . .. .. ... ........... ..........CEILING VISIBILITY IN UREDS OF METERS

IN G1 GE BE GE GE GE GE GE Gc GE GE GE GE GE GE GE

o FEET 1 160 90 RD 60 98 90 32 29 20 16 12 10 8 5 9 0...... ...... ...... ..... ...... ...... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ...

NO CEIL I 20.1 21.3 29.3 26.4 27.3 29.7 30.8 31.6 32.7 32.8 32.8 32.8 35.0 31.0 33.0

GE 200001 22.3 23 5 27.2 29.3 30.2 330 39.3 35.2 36.8 37.9 37 S5 7.6 37.9 37.9 380

GE 1ADOUl 22.5 21.8 27.1 29.1 30.1 33.2 39.6 35 . 37.1 37.6 37.8 37.9 38.2 38.2 38.3

GE 160001 225 23.8 27.5 29.5 30. 33.2 39.6 31.9 37.1 37.6 37.8 37.9 38.2 38.2 38.3

GE 190001 22:7 Z4:0 27:7 29.9 30.9 33.7 35.0 35.9 37.5 38.0 38.? 38.3 38.6 3.6 38.7GE 120001 22.7 29.0 27.9 30.1 31.0 13.8 35.2 36.0 37.6 38.2 38.3 38.5 38.7 3q.7 38.9

GE 100001 29.9 26.9 31.2 33:9 39.3 37.1 38.1 39:9 91.2 91.9 91:9 92:0 92.3 9.3o 92:

U GE 90001 255 27.6 31.9 39.3 3S13 3800 39.6 90.1 9203 92.9 93.0 93.1 93.9 91. 93.1

GE 80001 27.7 29.8 39.2 37.0 37.9 90.8 92.7 93.8 1.57 96.3 96o6 96.7 97.1 9 7.1 97.3GE 7CO01 28.9 30.5 35.0 37.8 38.7 41.6 93.5 4.6 96.6 97.1 97.9 97.5 97.9 97.9 96.1GE 60001 29.0 31.0 35.6 38.3 39.3 92.Z 99.1 95.2 97.1 97.7 97.9 98.1 98.5 9.5 98.6

GE 50001 31.7 33.9 39.9 43.1 44.2 97.3 99.7 510 53.2 S3.7 59.1 59.3 59.7 59.7 5.8

GE 95001 33.2 35.7 91.6 95.5 96.'7 50.0 52.7 59*1 16.9 57.9 57o8 58.3 58.9 58.9 16.5

GE 90001 37.0 39.7 96.2 51.1 52.3 55.9 59.2 60.6 63.3 63.9 69.3 69.94 69.8 69.8 65.0GE 35001 39.6 92.9 99.6 59.7 51.9 59.6 63.3 64.7 67.6 68.1 68.1 68.7 69.1 69.1 69.2GE 30001 42.0 9.3 52o 57.7 59.2 63.2 67.0 68.9 71.9 72.1 72o 72.7 73.1 73.1 732

GE 25001 99.9 97.9 51 61.0 62.5 66.8 TO.? 72.1 71.1 71.8 76.2 76.9 77.3 7703 77.5

GE 20001 97.3 51.0 58.09 69.7 66.2 70.6 79.6 76.1 79.3 79.9 8o9 81.0 p1.5 81o 81.6

GE 18001 48.2 51.9 59.9 65.7 67.2 71.6 75.5 77.1 80.2 80.9 81.3 82.0 82.9 87.9 82.6GE 15001 99.6 53.9 61.7 67.9 69.0 73.9 77.1 79.0 82.9 83.1 83.5 89.2 89.6 89.6 89.8GE 12001 51.1 55.1 69.0 70.2 71.7 76.2 80.5 82.0 A3.6 86.3 86.7 87.9 87.8 87.8 87.9

GE I0001 51.6 558 651 71.'. 73.1 77.7 82.0 83:7 87.5 88.2 88.6 89.3 89.8 8 .8 90.0- GE 9001 519 56.2 65.5 71.8 73.1 78.2 82.6 89.2 88.0 88.7 89.1 09.8 90.9 9 ",.4 90.5

GE 800 52.2 56.6 66.1 72.5 79.2 78.8 83.2 89.9 88.7 89.8 89.8 90.5 91.1 91.1 91.2

GE 7001 52.2 56.6 66.2 72.9 74.6 79.9 83.9 81.6 89.9 90.1 90.5 91.2 91.8 91.8 91.9GE 6001 52.3 56o7 67.0 74.2 75.8 80.6 85.9 87.9 91.2 91.9 92.3 93.0 93.5 93.5 93.7

GE 5001 52.9 57.7 68.9 71.5 77.3 82.1 87.1 89.1 t93.3 911.0 99.9 95.1 95.6 9€c.6 95.7GE 9001 52.9 57.7 68.8 76.0 7T7.7 82.6 87.6 89.7 99.0 99.6 951 95.7 96.3 96.3 96.9GE 3001 12.9 57.7 68.8 76.0 77.7 82.6 87.6 89.8 99.1 99.8 91.3 96.2 96.8 96.8 97.1

GE zool 52.9 57.7 68.8 76.0 77.7 82.6 87.6 90.0 99.9 95.5 96.3 97.3 97.9 97,9 99.2*

' GE tia0 52.9. 57.7 68.8 76.0 77.7 82.6 87.6 90.0 94.5 95.6 96.6 97.5 98.9 99. 100.0

GE c 52.9 57.7 68.8 76.0 77.7 82.6 87.6 90.0 919.5 9S.6 96.6 97.1 98.9 98. 100.0

............................................................ ......... ......................................................

TOTAL NMIRE OF OB5ERVATIONS: 728

)

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURPENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEA114ER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-83.05-87MONTI': APR HOURSILSYI: 0900-11l00

CEILING VISIBILITY IN HUNDREDS OF MEYERSIN DOT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

OFEET 9 16 90 Ao 60 4A NO 3? 24 20 1b 12 10 a S N 0

NO CEIL 1 71.6 22.1 246.1 25.7 26.3 26.8 27.1 27.2 27.2 27.2 Z7.2 27.2 27.2 2 7.? 27.2

GE 200001 25.2 25.8 28.2 30.0 3C. 7 31 .6 32.0 12.2 32.3 32.3 32.3 32.3 32.3 12.3 32.3GE 183001 25.3 25.9 2B.4 30.2 30.8 31.7 32.1 32.3 32.5 32.5 32.5 32.5 1Z.5 32.5 12.5GE 16CO01 25.3 25.9 28.4 30.2 30.8 31.7 32.1 32.3 32.5 32.5 32.5 32.S 32.5 32.S 32.5GE 140001 25.40 26.1 28.5 30.3 30.9 31 .A 32.2 32.5 32.6 32.6 32.6 32.6 12.6 32.6 32.6

-GE 120001 25.5 26.2 28.6 30.4 31.1 32.3 32.3 32.6 32.7 32.7 32.7 32.7 12.7 32.7 12.7

GE 100001 28.4 29.0 31.6 33.6 34.3 35.2 35.6 35.8 36.1 36.1 36.1 36.1 36.1 36.1 36.1-GE 9!001I 29.1 29.8 32.6 34 .A 35.4 36.6 37.0 37.2 37.5 37.5 37.5 37.S 37.5 31.5 37.5

GE 801.09 31.5 32.3 35.6 37.7 36.6 40.1 40.,6 40.6 41. 1 141.1 41.1 41.1 41.1 41.1 41.1GE 7c039 13.5 34.4# 37.7 39.9 4D.9 42.4 42.9 43.*1 43.4 413.4 4 3.4 143.4 43.4 4 1.4 43.4GE 60001 33.6 34.5 38.1 40.3 41.;3 42.7 4 3. 3 43.5 43.8 43.8 4 3.8 43.8s 43.4 q 3.8 4 3.8

G.E 50001 35.9 37.2 40.9 43.4 44.4 46.1 46.9 4t7 .1 47.5 47.5 47.5 47.5 47.5 4 7.5 47.SGE I#St0o 37.5 39.0 42.9 45.4 46.5 4A .1 48.9 49.2 49.6 '19. 6 49.6 49.6 49.6 49.6 49.6GE %0001 43.0 44.8 49.0 51.7 52.8 5 4.8 55.6 55.8 56.2 56.2 56.2 56.2 56.2 56.2 56.2GE 35001 46.7 48.7 53.1 56.0 57.0 59.1 59.8 60.1 60.5 60.S 60.5 60.5 60.5 63.5 60.S

0GE 30001 56.5 56.4 63.2 66.2 67. .4 69.7 71.0 11.2 71.8 71.8 71.8 71.8 71.8 71.8 71.6

GE 25009 61.2 63.4 68.3 71.5 72.6 75.4 76.6 76.9 77.4 77.4 77.4 77.5 77.5 77.5 1.5GE 20001 65.0 67.1 72.0 75.5 76.8s 79.5 81.0 Al1.3 81.6 81.6 81.8 A1.9 61.9 81.9 V 1.9GE 18ro9 6S.2 67.41 72.4 7S.9 77.2 79.8 81.41 81.6 82.2 82.2 62.2 62.3 82.3 82.3 82.3GE 15001 87.5 69.7 75.0 78.7 80.0 82.7 64.2 64.5 85.0 85.0 85.0 65.1 65.1 65.1 85.1oGE 12001l 69.8 72.3 78.0 61.9 63.2 86.1 88.1 $8.3 48.6 A6.8 68.6 89.0o 89.0 69.0 89.0

GE 10009 12:.0 74.5 80.9 8:9 6.:1 892 91.4 91:7 92:.2 92.2 92.2 92.3 92.3 92.3 92.3O E 9001 12.1 74.6 81. 851 86.4 89.5 91. 91.9 92. 92.4 92.41 92.6 92.6 92.6 92.6

GE 000 72. 75.5 82.4 86.4 87.7 90.9 93.3 93.6 94.2 94.2 94.2 90% 94.,4 9 4.4 6 94.4 4&E ?00) 73.0 75.7 82.6 66.9 88.3 91.7 94.5 94.7 95.4 95.4 95.4 95.5 95.5 95.5 95.5GE 6.uoi 13.0 75.9 83.1 87.2 88.6 92.0 95-1 95.4 96.3 96.1 96.3 96.41 96.4 96.6 96.4

GE 5009 73.2 76.0 83.2 67.3 88.8 92.4 95.6i 96.3 97.6 97.6 97.6 97.7 97.8 9 7.8 97.8* .GE 4009 13.2 76.0 83.:2 673 88..8 92.4 95.6 96.3 97.6 97.8 97.8 97.9 98.1 98.1 96.1

GE go 71.2 16.0 83.2 67.3 88.8 92 .41 95.6 96.6 96.7 48.7 986e 99.0 99.2 9 9.41 99.40

GE 01io 73.2 76.0 83.2 67.3 88.6 92.4 95.8 96.8 96.7 96.7 99.1 99.2 99.9 10a".0 100.0

................................................. .......o...........................................................................

TOTAL NUMBER OF OBSERVATIONS- 779


USAFETAC FROM IOURLY OBSERVATIONS

AIR AEAI'ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO48URY UNITED KINGDOM PERIOD OF PECORD: 78-83,85-87MONT: APR IWOUpSILSTI: 120Tf-I300

. . .. . ...... .................................. ....................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

iN I 01 GE GE GE GE GE GE GE GE GE GE GF GE GE GE (,E

FEET I 160 9 Ba 60 8 '40 32 74 20 16 12 10 4 5 4 G

- NO CEIL 1 19.6 20.3 21.7 22.1 22.2 22.2 22.2 12.2 22.2 22.2 22.2 22.2 22.2 2 ".2 22.2

GE 200001 26.1 26.9 28.6 29.4 29.7 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29.9GE 180 3I 26.2 27.0 28.7 29.5 29.9 30.0 30.0 30.0 30.0 3'2.0 30.0 33.0 30.0 32.0 10.0GE £60001 26.2 27.0 28.7 29.5 29.9 30.0 30.0 30.0 30.0 30.0 30.0 30.0 30.0 3.1.0 30.0G E 140001 26.5 27.2 29.U 29.7 30.1 30.2 30.2 30.2 30.2 30.2 30.2 30.2 30.2 31.2 30.2GE 12C001 27.1 27.9 29.6 30.4 30.7 30.9 30.9 30.9 30.9 3.9 30.9 30.9 30.9 33.9 3C.9

GE 100001 28.6 29.4 31.1 32.0 32.4 32.5 32.5 32.5 32.5 32.5 32.5 32.5 3Z.9 32.5 32.5GE 90001 29.7 30.5 32.2 33.1 33.5 33.6 33.6 33.6 33.6 33.6 33.6 33.6 33.6 33.6 33.6

bE 8o 13.6 34.4 36.3 37.5 37.9 38.0 38.0 38.0 38.0 3P.0 38.0 38.0 38.0 39.0 38.0

GE I7%01 34.8 35.9 37.8 39.3 39.8 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9GE 60GUI 14.9 36.G 37.9 39.4 39.9 40.0 40.0 40.0 40.0 40.0 40.0 40.0 40.0 4 .0 4 c.

GE 5rgjl 18.5 39.6 41.8 43.4 43.9 44 .2 44.2 414.2 44.2 44.2 44.2 44.2 44.2 404.2 44.2GE 45I1 41.7 $42.8 45.0 46.8 47.3 47.6 47.6 47.6 47.6 47.6 47.6 47.6 47.6 4 7.6 4 1.6GE 40001 49.6 50.8 53.2 55.2 55.7 56.0 56.0 56.0 56.0 56. 56.0 56.0 96.3 59.0 96.0

GE 35001 57.5 58.8 61.4 63.6 64.1 64.9 64.9 64.9 64.9 64.9 64.9 64.9 64.9 64.9 64.9GE 30001 70.4 71.9 74.8 77.2 77.8 78.5 78.9 78.9 78.9 79.9 78.9 78.9 78.9 7.9 78.9

GE 25001 75.9 77.5 80.7 83.1 83.7 84.4 84.8 64.8 84.8 84.8 84.8 84.8 84.8 84.8 F4.8GE 22001 77.5 79.4 82.6 84.9 85.6 86.3 86.7 86.7 86.7 86.7 86.7 86.1 86.1 86.7 86.7GE 18001 78.0 79.9 83.3 85.7 86.3 87.1 87.5 87.5 87.5 87.5 87.5 81.5 87.5 87.5 87.5

GE 1SO0 81.2 83.4 87.6 90.0 90.6 91.5 91.8 91.8 91.'8 91.8 91.8 91.8 91.8 92.8 91.8GE 12003 82.7 85.1 89.3 91.8 92.5 93.9 94.4 94.4 94.4 94.4 94.4 94.4 94., 9 4.4 94.4

GE 10001 93.4 85.8 90.7 93.4 94.0 95.5 96.0 96.1 96.1 96.2 96.2 96.4 96.4 96.4 90.4

GE 9003 93.8 86.2 91.1 94.0 94.6 96.2 96.7 96.9 96.9 97.0 97.0 97.1 97.1 97.1 97.1GE 8o0 03.8 86.2 91.3 94. 95.0 96.7 97.Z 97.4 97.4 97.5 97.5 97.6 97.6 97.6 97.6GE 7001 93.8 86.2 91.3 94.6 95.5 97.4 97.9 98.0 98.0 98*1 98.1 98.2 98.2 98.2 98.2

GE 6001 83.9 86.3 91.5 94.7 95.6 97.7 98.2 98*5 98.6 98.7 98.7 98.9 98.9 98.9 98.9

GE SOi 894. 1 86.4 91.6 94.9 95.7 98.0 98.6 98.9 99.0 99.1 99.1 99.2 99.2 99.2 99.2GE 4001 84.1 86.4 91.6 94.9 95.7 98.0 98.6 98.9 99w) 99.2 99.2 09.4 99*4 99.4 99.4GE 3001 84.1 86.4 91.6 914.9 95.7 98.1 98.7 99.2 99.1 99.9 99.9 100.0 10 0.0 100.0 10 .0GE 001 814. 86.4 91.6 94.9 95.7 98.1 98.7 99.2 99.7 99.9 99.9 100.0 100.0 10 C. 100.0

j GC 2001 )9.1 86.4 9). 94.9 95.7 98.1 98.7 99.2 99.7 99.9 99.9 100.0 100.0 100.0 100.0

GE a1 961 86.4 .1.6 94.9 95.7 98.1 99. ? 99.2 99.7 99.9 99.9 100.0 1nO.0 100.0 100.0

...................................... .........1.............................................................................................

TO7AL NUMBER OF OOSERVATIONS: 797

.4I

GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM OURLY OBSERVATIONS

AIR WEATPER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87

MONTH: APR MOURS(LSTI: 150'-1700.. . . .. . . .. . . .. . . .. . . .. ........... . ........... . ........... ... ..... . .. • ............. ........................... .

CEILING VISIBILIY IN 0UL'NREOS OF METERS


FEET I 160 90 80 60 98 90 32 24 20 16 12 10 a 5 4 0.. .. .. .!b.e

. . e •. .° . .e c oe e . e e e e , .oe . .l e l t e e. ~ eS. . ° . . . ... . . . .. . .. . . . . . . .. . . . . . . .. . . . . . . . . . . ............oee.. ...... ......... .

NO CEII I 23.2 23.2 23.9 29.6 29.6 29.6 29.6 29.6 24.6 29.6 29.6 29.6 24.6 24.6 24.6

GE 200001 29.8 29.9 31.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 3Z.1 32.1 32.1 32.1 32.1GE 18301I 29.9 30.0 31.Z 32.2 32.2 32.2 32.2 32.2 32.2 32.2 32.2 32.2 32.2 32.2 32.2GE 160001 30.3 30.9 31.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6

GE 00001 30.3 30.4 31.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.6 32.66E 120001 '2.9 32.5 33.7 34.7 34; 7 34. 7 34.7 34.T 34.7 34.7 34.7 39.7 39.7 34.7 34.7

GE I O1CD1 33.9 39.1 35.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3GE 90001 35.1 35.3 36.9 37.5 37.5 37. 5 37.5 37.5 37.5 37.5 37.5 37.5 37.5 37.5 37.5GE 80 01 38.7 38.8 90.0 41.0 41.0 91.0 91.0 10.0 91.0 41.0 41.0 41.0 41.0 91.0 41.0GE 70001 91.0 91.2 92.3 43.9 43.9 43.5 93.5 43.5 93.5 43.5 43.5 43.5 43.5 4 3.5 43.5

GE 60001 91.0 91.2 92.3 43.9 93.9 93.5 93.5 43.5 43.5 43.6 4 3.5 43.5 93.5 43.5 43.5

GE SOo01 94.0 4.3 45.9 46.9 96.9 97.1 97.1 97.1 97.1 47.1 47.1 47.1 47.1 4 7.1 47.1

GE SU01 98.5 99.1 51.0 52.2 52. 3 52.4 52.4 52.9 52.9 52.4 52.9 52.9 52.4 5 7.4 52.9

GE 40001 57.9 58.7 6C.7 60.9 62.1 62.3 62.3 62.3 62.3 62.3 62.3 62.3 62.3 - .3 62.3GE 3600U 66.2 67.1 69.3 70.8 71.0 71 .2 71.2 71.2 7t.2 71.2 71.2 7;-2 71.2 71.2 71.2GE 30001 75.6 T6.7 79.0 80.6 80.9 81.9 81.9 81.9 81.9 81.9 81.9 81.4 R1.4 81.4 81.4

GE 25U01 81.0 82.2 89.9 86.8 87.0 87.7 87 87.7 87.7 87.7 83.7 87.7 87.7 8 7.7 87.7GE 2CO01 82.8 89.9 87.2 89.1 89.4 90.0 90.2 90.2 90.3 90.3 90.3 90.3 90.3 91.3 90.3(,E I8LUI 83.5 85.1 87.8 89.8 90.0 90.7 90.8 90.8 91.0 91.0 91.0 9110 91.0 91.0 91.0

GE 1500 14.9 86.6 89.9 91.9 92;1 92.8 93.3 93.3 93.4 93.4 93.9 93.9 93.9 93.9 93.4

GE 12001 96.1 87.9 91.6 93.8 99.1 94 .9 95.5 95.7 95.8 96.8 96.8 95.8 95.8 95.8 95.8

GE 100o0 86.9 88.5 92.3 99.6 94.9 95.9 96.7 96.9 97.0 97.0 97.0 97.3 97.0 97.0 97.0GE 9001 86.4 88.6 92.9 99.8 95.0 96.1 96.9 97.0 97.1 97.1 97.1 97.0 97.1 97.1 9T.1GE 8001 86.6 88.9 92.8 95.2 95.9 96.5 97.2 97.4 97.5 97.5 97.5 97.5 97.6 97.5 97.5

GE 7601 86.6 89.0 92.9 95.4 96.1 97.1 97.9 98.0 98.2 98.2 98.3 98.3 98.3 9B.3 98.3

GE 600) 96.6 89.3 93.3 95.8 96.6 98.0 98.8 99.1 99.5 99.5 99.6 99.6 99.6 99.6 99.6

GE soul 86.6 89.c 93.3 95.8 96.- 98r 98.8 99.2 99.7 99.7 99.9 99.9 99.9 99.9 99.9GE 9001 86.6 89.0 93.3 95.8 96.6 -18.0 98.8 99.2 99.9 99.9 100.0 100.3 100.0 1 .0 100.0GE 3001 06.6 89.0 93.3 95.8 96.6 98.0 98.8 99.2 99.9 99.9 100.0 100.0 100.0 100.0 100.0GE 2001 86.6 89.0 93.3 95.8 96.6 98.0 98.8 99.2 99.9 99.9 100.0 100.0 00.0 100.0 100.0GE T001 86.6 89.0 9z.3 95.8 96.6 98.0 98.8 99.2 99.9 99.9 100.0 100.0 1O.0 1a0.0 1C0.0

GE QI 6.6 89. X 93.3 95.8 96.6 98.0 98.8 99.2 99.9 99.9 i00.0 100.0 103.0 I00.0 100.0


'-n .4.O -

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR UEATHER SERVICE/MAC

STATION NUMBER: 015623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: APR HOURS(LSTIZ 1800-2,)0

......................................................................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I 01 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 8 40 32 24 Z0 16 12 10 8 5 4 0

NO CEIL 1 29.1 30.0 30.6 31.4 31.9 32.0 32.2 32.2 32.3 32.5 32.5 32.5 32.5 32.5 32.5

GE 230001 37.7 39.1 40.2 41.3 41.7 42.0 42.2 42.3 42.5 42.7 42.7 42.7 42.7 42.7 42.7GE 180001 37.8 39.2 40.3 41.4 41.9 42.2 42.3 42.5 42.7 42.8 42.8 42.8 42.8 42.8 42.8GE 160001 37.8 39.4 40.5 41.6 42.0 42.3 42.,5 42.7 42.8 43.0 43.0 43."o 43.0 43.0 43.0GE 140001 37.8 39.4 40.5 41.6 '42.0 42.3 42.5 '42.7 42.8 '430 '43.0 43.0 43.0 43:0 '43.0GE 1200G1 38.8 .6 '42.0 43.1 43.6 '439 '44.1 44 2 '4'44 44 5 '45 44.5 '4.5 44.5 '445

GE 100001 40.8 42.8 44.2 45.3 45.8 46.1 46.3 46.4 46.6 46.7 46.7 46.7 46.7 46.7 46.77 GE 90001 41.6 43.8 45.2 46.3 46.7 47.0 47.2 47.3 47.S 47.7 47.7 47.7 '4.7 4 7.7 47.7

GE 80001 45.2 47.7 49.1 50.3 50.8 51.3 5 1.4 51.6 517 51.9 51.9 51.9 51.9 51.9 51.9GE 70001 '47.0 9.:7 51.4 52.7 53.1 53.6 53.'8 53.9 S4.1 54.2 54.2 54.2 54.2 54.2 54.2GE 60001 '472 49.8 51.6 52.8 53.3 53.8 53.9 54.1 54.2 54.4 54.4 54.4 54.4 54.4 54.4

GE 500 49.5 52.5 54.5 55.8 56.3 56.7 56.9 57.0 57.2 57.3 57.3 57.3 57.3 57.3 57.3GE '45001 52.8 56.1 58.3 59.5 60.0 60.5 60.6 60.8 61.3 61.4 61.4 61.4 61.4 61.4 61.4GE 40001 60.0 63.8 66.1 67.3 67. 8 68.3 68.4 68.6 69.2 69.4 69.4 69.4 69.4 69.4 69.4

GE 35001 63.4 67.2 69.7 70.9 71.4 72.2 72.3 72.5 73.1 73.3 73.3 73.3 73.3 7.3 73.3GE 30001 69.1 73.1 76.3 77.5 78.0 78.8 78.9 79.1 80.0 80.2 80.2 80.2 80.2 80.2 80.2

GE 25GOI 73:0 77.2 81.1 82.5 83.0 83.9 84:1 84.2 85.2 85.3 85.3 85.3 85.3 85.3 85.3C- GE 200UU 15.5 80.2 84.1 85.5 86.'1 87.3 87.7 87.8 88.9 891 89.1 89.1 89.1 89.1 89.1

GE 18C J1 75.6 80.3 84.2 85.6 86.3 87.5 87.8 88.0 89.1 89.2 89.2 89.2 89.2 89.2 89.2GE 150Gi 76:7 81.6 85.6 87.2 87.8 89.2 89.7 89.8 90.9 91.1 91.1 91.1 91.1 91.1 91.1GE 12001 78.3 83.3 88.3 90.2 90.8 92.5 93.0 93.4 94.5 94.8 95.0 95.'o 95.0 99.0 95.0

GE 10001 78.8 83.8 88.9 90.8 91.4 93.1 93.8 94.5 95.8 96.1 96.3 96.3 96.3 96.3 96.3

GE 9.1J 79.1 84.2 89.4 91.3 91.9 93.6 94.2 95.0 96.3 96.6 96.7 96.'7 96.7 96.7 96.7GE 8001 79.5 84.7 89.8 91.9 92.5 94.4 95.2 95.9 97.2 97.5 97.7 97.7 97.7 97.7 97.7GE 7001 79.7 84.8 90.0 92.3 93.0 94.8 95.9 96.7 98,0 9A.3 98.4 98.4 98.4 98.4 98.4

. GE 6001 79.8 85.0 90.5 92.8 93.4 95.3 96.4 97.2 98.4 98.8 98.9 98.9 98.9 98.9 98.9

GE 500l 79.8 85.0 90.5 93.0 93.6 95.5 96.7 97.7 99.2 99.5 99.7 99.7 99.7 99.7 99.7

O GE 4001 79.8 85.3 90.5 93.0 93.6 95.5 96.7 97.7 99.4 99.7 99.8 99.8 99.8 99.8 99.8GE 3001 79.8 85.0 90.5 93.0 93.6 95.5 96.7 97.7 99.5 99.8 100.0 100.0 100.0 100.0 1co.0

GE 2001 79.8 85.0 90.5 93.0 93.6 95.5 96.7 97.7 99.5 99.8 100.0 100.0 1O0.0 1to0 100.0GE IOl 79.8 85.0 90.5 93.0 93.6 95.5 96.7 97.7 99.5 99.8 100.0 100.0 I1no0o 100.0 1000.

GE G1 79.8 85.0 90.5 93.0 93.6 95.5 96.7 97.7 09.5 99.8 103.0 100.0 100.0 13.0 130.0


GLOBAL CLIMA70LOGY BRANCH PERCENTAGE FREQJUENCY OF OCCURRENCE OF CEILING VrRSUS VISIBILITYUSAFETAC FROM 1-OURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO'4ALRY UN17ED 14INGOOM PERIOD OF RECORD: 78-83,85-87M0NTV: APR IOURSILSTI: 210C 2Z0O

CE IL ING V I SIBIL I TY I N 1UNOREDS OF METERS-IN 61 BE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I160 90 80 63 88 810 32 28 20 16 12 10 8 5 4 0

NO C~l ! 6.8 39.3 80.3 40.9 81.1 81 .1 81.1 81.1 82.2 42.8 N 2.8 82..8 42.8 842.8 42.8

GE 210001 '41.5 83 .A 46.1 87.3 47.5 47 .5 48.1 48.1 48.6 49.2 '49.2 49.2 89.2 N 9.2 49.2

GE 160001 41.9 88.2 46.5 87.1 47. 9 87 .9 88.4 88.4 89.0 89.6 49.6 89.6 49.6 49.6 49.6GE 14801 81.9 44.2 46.5 87.7 41.9 81.9 88.4 48.4 49. 49.6 89.6 49.6 49.6 49.6 49.b

2GE 120r0! 81.9 881.8 81.1 48.3 48.4 88.4 49.0 89.0 89.6 503.2 50.2 50.2 50.2 53.2 50.2

GE 100001 83.8 '45:9 88.6 49:8 51.0 50.0 50.6 5(2.6 51:2 531.7 51.7 51.7? 91.7 51.7 51.72GE 9000 43.4 85.9 48.6 49. a 50.0 s0.0 50.6 so.6 S1.2 51.7 51.7 51.7 51.7 51.7 51.7

GE 8S'0D! 85.0 47.9 50.8 51.9 S2.1 52.1 52.7 52.7 53.3 53.9 53.9 53.9 53.9 53.9 53.9GE 70001 86.1 89.2 52.1 53.3 53.5 53 .5 58.1 54.*1 54.7 S. 55.2 5 5.2 55.2 5S.2 S5.2 5.

2GE 0001O 86.1 89.8 52.5 53.7 53.9 53.9 54.5 54.5 55.0 55.6 55.6 55.6 55.6 55.6 55.6

GE $0001 88.3 51.6 54.7 56.2 56.4 56.8 57.0 57.0 57.6 58.1 58.1 SA.1 58.1 5AR.1 58.1GE 45001 82.1 55.6 58.7 60.5 60.7 60.7 61.2 61.2 62.0 62.6 62.6 62.6 62.6 62.6 6Z.6GE 40001 57.8 60.9 64.3 66.1 66.3 66.3 66.9 66.9 67.6 68.2 68.2 68.2 68.2 64.2 68.2GE 35001 61.6 6S.1 68.6 70.5 70.9 7D.9 71.5 71.5 72.3 72.9 72.9 72.9 72.9 72.9 72.9GE 3000! 68.8 72.3 76.2 78.1 78.5 78.5 79.1 79.1 80.0 80.6 80.8 80.8 80.8 81.8 81.6

GE Z5001 71.3 75.41 79.8 82.4 82.8 82.8 83.3 83.3 88.3 88.9 85.1 85.1 85.1 8 5.1 85.1GE 20001 73.1 77.1 81.8 84.7 85. 1 85.1 85.7 b5.7 86.6 87.2 87.8 87.8 87.4 87.8 87.4GE 18001 73.3 17.3 82.0 85.1 85.5 as.5 86.0 86.0 87.0 87.6 87.8 87.8 87.8 8 7.8 87.8

GE 1500! 18.2 78.3 83.1 86.2 86.6 86.6 87.2 87.2 S8.2 88.8 89.0 89. 0 89.0 89.0 89.0OGE 12001 16.6 80.8 86.8 89.5 89.9 89.9 90.5 90.5 91.5 92.1 92.2 92.2 92.2 92.2 92.2

GE 1040 17.9 82.8 88.4 91.5 91.9 91.9 92.4 92.8 93.8 98.2 98.6 98.6 94.6 94.6 98.6OGE 900! 77.9 62-4 88.8 91.5 91.9 91.9 92.8 92.8 93.8 98.6 95.0 95.0 95.0 95.0 95.0

GE 8001 78.9 8 3 .7 89.9 91.2 93.6 93 .6 94.6 98.6 95.5 96.3 96.7 96.7 96.7? 96.7 96.7GE 700! 79.1 84.1 93.3 93.8 98.2 94 .2 95.5 9S.S 96.5 97. 3 9 7.7 97.7 9. 77 9.

GE 600! 79.S 84.5 91.1 98.8 95.2 95 .2 96.5 96.5 97.5 98.3 98.6 986 98.6 98.6 98.6

GE 501! 79.5 881.5 91.1 98.8 95.2 95.2 96.5 96.5 97.5 98.3 98.6 98.6 98 .6 99.6 98.6GE 8001 79.5 88.5 91.3 95.0 95.5 95 S 96.9 96.9 97.9 98.8 99.2 99.2 99.2 99.2 99.2GE 30GI 79.5 88f#.5 91.3 95.0 95.5 95.7 97.1 97.1 98.8 99.6 100.0 100.0 100.-0 101.0 100.0GE 2001 79.S 88.5 91.3 95.0 95.5 95 .7 97.1 97.1 98.8 99.6 100.0- 100.0 100.0 101.0 i00.0

I2GE 1001 19.5 84.5 91.3 95.0 95.5 95.7 97.1 97.1 98.8 99.6 100.0 100.0 100.0 100.0 100.0

BE 01 79.5 54.5 91.3 95.0 95.5 9S.7 97.1 97.1 98.8 99.6 100.0 100.0 100.0 10-3.0 100.0.............................................................................................................................................




STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURy UNITED KINGDOM PERIOD OF RECORD: 78-83,85787

MONTH: APR HOURSfLSTI: hLL.... ..... .. .... ....... ... .... .... .. .. ............ .S B I (U............. ..... ...... ......"''


IN 1 G7 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0

NO CETL | 24.9 25.9 27.9 29.0 29.4 30.0 30.5 30.7 31.0 31.2 31.2 31.2 31.2 31.2 31.3

GE 2000,,l 29.7 30.9 33.3 34.8 35.3 36.1 36.6 36.9 37.3 37.6 37.6 37.6 37.7 37.7 37.8GE 180001 29.9 31.1 33.5 35.0 35.4 36.3 36.8 37. 1 37.5 37.7 37.8 37.8 37.9 37.9 38.0GE 160001 29.9 31.2 33.6 35.0 35.5 36.4 36.9 37.1 37.6 S7.8 37.9 37.9 38.0 3A.0 38.0

GE 1400C1 30.1 31.3 33.8 35.2 35.7 36.6 37.1 37.3 37.8 38.1 38.1 38.1 ?8.2 38.2 38.2

GE 12001 30.7 32.0 34.5 36.0 36.4 37.3 37.8 38.0 38.5 38.7 38.8 38.8 !8.9 30.9 38.9

GE 100001 32.5 33.9 36.6 38.1 38.6 39.5 43.1 40.3 40.8 41.0 41:1 41.1 41.2 41.2 41.3GE 90001 33.3 34.7 37.4 39.0 39.5 40.5 41.0 41.3 41.8 42 l 42.0 42.1 42.1 42.1 42.2

GE 8700l 36.0 37.6 140,.S 42.2 42.7 43.8 44.4 44.7 45.3 45.5 45.6 45.6 N5.7 45.7 45.7GE 70001 37.4 39.1 42.0 43.8 44.4 45.4 46.1 46.4 47.

0 47.2 47.3 47.3 47.4 4 7.14 47.4

GE 69001 37.5 39.3 42.3 44.1 44.6 45.7 46.4 46.7 47.3 47.5 47.6 47.6 47.7 47.7 47.7

GE 5OCO 40.2 42.2 45.7 47.7 48.3 49.6 53.4 5.7 51.4 51.6 51.7 51.7 51.8 51.8 51.9GE 45001 43.1 45.4 49.2 51.3 52.0 53.3 54.2 54.6 55.4 55.6 55.7 55.7 55.8 55.8 55.9GE 4C001 49.4 51.9 56.1 58.5 59.1 60.7 61.7 62.0 62.9 63.1 63.2 63.2 63.3 63.3 63.4

GE 35001 54.0 56.8 61.1 63.6 64.3 66.1 67.1 67.5 68.3 68.5 68.6 68.7 68.7 64.7 68.8

GE 3OU1o 61.1 63.9 68.6 71.3 72.1 74.0 75.3 75.7 76.6 76.9 77.0 77.0 77.1 77.1 77.2

GE 25001 64.9 68.0 73.0 75.9 76.7 78.8 8 . 80.4 81.4 81.7 81.8 81.9 82.0 02.0 82.0

GE 2r00I 67.3 70.7 75.8 78.9 79.8 81.9 83.3 83.7 84.7 85.0 85.1 85.2 85.3 85S3 85.4GE 18L.)0 67.8 71.1 76.3 79.4 8C.3 82.4 83.8 84.2 85.2 81.5 85.6 85.7 85.8 8 5.8 85.9

GE 15001 69.7 73.2 78.7 82.0 82.8 85.0 86.5 86.9 87.9 88.2 88.3 88.4 88.5 8AR.5 88.6GE 12D01 71.3 75.0 81.1 84.5 85.3 87.7 89.3 89.8 90.9 91.1 91.3 91.4 91.5 91.5 91.5

GE ICOOt 72.4 76.1 82.6 86.1 87.0 89.5 91.2 91.7 92.9 93.2 93.4 93.5 93.b 93.6 93.7C GE 9G01 72.6 76.4 82.9 e6.5 87.3 89.8 91.6 92.1 93.3 93.6 93.8 93.9 94.0 914.0 914.1

GE 8001 73.0 76.9 83.5 87.2 88.1 90.6 92.5 93.0 94.2 98.5 94.7 94.8 94.9 94.9 95.0GE 7OCII 73.1 77.1 83.9 87.7 88.7 91.3 93.3 93.8 95.0 95.4 95.5 95.7 95.8 95.8 95.9GE 600: 73.3 77.3 84.3 88.3 89.3 92.1 91.1 914.0 96.1 96.4 96.5 96.7 96.8 96.8 96.9

GE Soot 73.5 77.6 84.7 88.8 89.8 92.6 94.8 95.5 97.0 97. 3 97.5 97.6 97.7 97.7 97.8

*GE soul *3.5 77.6 84.9 89.0 90.1 92.9 95.1 95.9 97.5 97.9 98.0 98.2 98.3 98.3 98.GE 3001 73.5 77.6 84.9 89.1 90.2 93.0 95.3 96 . 98.0 9R.3 96.5 98.7 98.9 99.9 99.0

GE 2001 73.5 77.6 84.9 89.1 90.2 93.0 95.4 96 3 98.2 9?.7 98.9 99.1 99.14 9.4 99.8GE 1001 73.5 77.6 84.9 89.1 90.2 93.0 95.4 96.3 98.2 98.7 99.0 99.2 99.4 90.5 100.0

GE 01 73.5 77.6 8q.9 89.1 90.2 93.0 95.4 96.3 98.2 98.7 9.0 99.2 99.4 99.5 100.0


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREGUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSArFTAC FROM HOURLY OBSERVATIONSAIR WEAIHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87

MONTH: MAY HOURSILSTI: 00C70200

...................•. • . ..................................................................

CEILING VISIBILITY IN HUNDREDS OF METERSIN 6GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0

NO CEIL I 39.0 40.0 42.0 43.5 43.5 43.5 44.7 44.7 44.7 44.7 45.2 45.2 45.2 A4.2 45.4

iGE 2DOGDI 42.5 44.0 46.9 48.4 48. :6 50.4 50.4 50.4 50.4 50.9 50.9 51.9 50.9 51.4Q GE 180001 42.5 44.0 46.9 48.4 48,4 4 86 50.4 50.4 50.4 50.4 50.9 50.9 50.9 51.9 51.4

GE 160001 42.5 44.0 46.9 48.4 46.4 48.6 50.4 50.4 50.4 50.4 50.9 50.9 50.9 513.9 51.4

GE 140001 42.5 44.0 46.9 48.4 48; 48.6 50.4 SD.4 50.4 5O.4 50.9 50.9 50.9 50.9 51.4

GE 120001 42.7 44.2 47.2 48.6 48.6 48.9 SO.b 50.6 50.6 50.6 51.1 51.1 51.1 S1.1 51.6

GE 100001 43.7 45.2 48.1 49.6 49.6 49.9 51.6 51.6 51.6 51.6 52.1 52.1 S2.1 52.1 52.6

GE 90001 44.0 45.4 48.4 49.9 49.9 50.1 51.9 51.9 51.9 51.9 52.3 52.3 52.3 52.3 52.8GE 80001 45.9 47.4 51.6 53.1 53.1 53.3 55.1 55.1 55.1 5 .1 55.6 55.6 55.6 55.6 56.0

GE 7O0ol 45.9 47.9 52.3 53.8 53.8 54.1 55.8 55.8 55.8 55.8 56.3 56.3 56.3 56.3 56.8

GE 60001 45.9 47 9 52.3 53.8 53.8 54.1 55.8 55.8 55.8 55.8 56.3 56.3 56.3 56.3 56.8

GE 50001 47.9 50.1 54.8 56.3 56.3 56.5 58.3 58.3 58.3 58.3 58.8 58.8 S8.8 58.8 59.3

_ GE 45031 51.6 53.8 58.8 60.2 60.2 60.5 62.2 62.2 62.2 62.2 62.7 62.7 62.7 b2.7 63.2GE 40001 58.5 61.0 65.9 67.9 67.9 68.1 70.1 70.1 70.1 70.1 70.6 70.6 70.6 7V.6 71.1GE 35001 60.5 63.7 68.6 70.6 70.6 70.9 73.1 73.1 73.1 73.1 73.6 73.6 73.6 73.6 74.1

G- GE 30001 63.0 b6.9 72.1 74.1 74.1 74.3 76.5 76.5 76.5 76.5 77.0 77.0 77.0 77.0 77.5

GE 25001 65.2 69.4 74.8 76.8 76.8 77.0 79.3 79.3 79.3 79.3 79.8 79.8 79.8 79.8 80.2GE 20001 66.9 71.1 77.0 79.3 79;3 79.5 81.7 81.7 81.7 81.7 82.2 82.2 82.2 82.2 82.7

GE 181.01 66.9 71.1 77.3 79.5 79.5 79.8 82.0 82.0 82.0 82.0 82.5 82.5 82.5 82.5 83.3

GE 15001 67.9 72.6 79.5 82.0 82.0 82.2 84.4 84.4 84.4 84.4 84.9 84.9 84.9 84.9 85.4c GE 120a1 68.6 73.3 80.5 83.0 83.0 83.2 85.4 85.4 85.4 85.4 85.9 85.9 85.9 85.9 86.4

GE IOGO 70.4 75.1 82.5 84.9 84.9 85.2 87.7 88.1 68.1 88.1 88.6 88.6 88.6 88.6 89.1

GE 9oa 70.4 75.1 82.5 85.4 85.4 85.7 88.1 88.6 88.6 88.6 89.1 89.1 49.1 89.1 89.6GE 8aa 70.9 75.6 83.5 86.4 86.4 86.7 89.1 89.6 89.6 89.6 90.1 90.1 90.1 90.1 90.6GE 7001 71.1 76.5 84.4 87.9 87.9 88.1 90.6 91.1 91.1 91.1 91.6 91.6 91.6 91.6 92.1

GE 60CI 71.1 76.5 85.2 88.6 88-6 88.9 91.4 91.9 91.9 91.9 92.3 92.3 92.3 92.3 92.8

GE 5001 711 76:5 95:2 88.9 89.1 89.4 91.9 92:6 92.6 92:6 93.1 931 93.1 93.1 93:6

Ge 4001 71.1 76.5 85.2 89.1 89.4 90.4 92.8 93.6 93.8 93.8 9%.3 94.3 94.3 94.3 94 8

GE 30G01 71.1 76.5 85.7 90.4 90.9 91.9 94.3 95.1 95.3 95.3 96.0 96.3 96.3 96.5 98.0GE 2001 71.1 76.5 85.7 90.6 91.1 92.3 94.8 95.6 96.0 96.3 97.0 97.3 97.3 97.5 99.3

GE 1001 71.1 76.5 85.7 90.6 91.1 92.3 94.8 95.6 96.0 96.3 97.0 97.3 98.0 98.3 100.0

GE al 71.1 76.S 85.7 90.6 91.1 92.3 94.8 95.6 96.0 96.3 97.0 97.3 98.0 98.3 100.0

..........................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS: 4aS

I2

2I

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM #-OURLY OBSERVATIONSAIR wEATHER SERVICEIMAC

STATION NUMER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85.87MONTH: MAY HOURSILST): 030C-0500

CEILING VISIBILITY IN HUNDREDS OF METERSIN I G[ GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 160 90 80 60 48 CI0 32 24 20 16 12 10 8 5 4 0

O NO CElL I 28.3 30.3 35.1 37.2 38.0 38.7 39.3 39.6 39.9 39.9 40.2 40.7 41.0 41.0 41.1

GE 2000 31,3 33.3 38.6 40.7 41.5 42.7 43.7 NM5 44,9 44.9 445.4 45.8 46,1 46.4 46.7

GE 160001 !1.3 33.3 38.6 40.7 41.5 42.7 43.7 44.5 44.9 4.9 45.4 4S.8 46.1 46.4 46.7GE 140001 31.3 33.3 38.6 40.7 41.5 42.7 43.7 44.5 44.9 444.9 45.4 45.8 46.1 46.4 46.7o GE 120001 31.5 33.4 38.7 40.8 41.6 42.8 It3.9 444.6 45.1 45.1 45.1 46.0 46.3 46.6 46.9

GE 10000: 33.3 35.6 40.8 43.0 43.7 45.1 46.3 47.0 47.7 47.7 48.1 48.6 48.9 49.2 49.5C' GE 90001 34.3 36.6 41.9 44.3 45.'1 46.4 47.7 48.4 49.0 49.0 49.5 49.9 50.2 .0.5 50.8

GE 80001 36.6 38.9 44.9 47.4 48*1 49.5 50.7 51.4 52.0 52.0 52.5 53.0 53.6 54.0 54.3GE 70001 37.2 39.5 45. 48.1 48.9 50.2 51.4 S2.2 SZ.8 52.8 53.3 53.7 54.3 54.8 55.1GE 60001 37.2 39.5 445.5 48.1 48.9 50.2 51.44 52.2 52.8 52.R 53.3 53.7 54.3 54.8 $5.1

GE 50001 38.1 40.5 46.9 49.8 50.5 52.2 53.4 54.3 55.1 55.1 5.1 56.0 56.6 57.0 S7.3GE 45001 40.7 43.3 49.9 52.8 53.6 55.4 56.6 57.5 58.2 58.2 58.7 59.2 S9.8 61.2 60.5GE 40001 44.9 47.7 54.6 57.9 59.0 60.8 62.0 62.9 63.7 63.7 64.1 64.6 65.2 bS.7 66.1GE 35001 46.7 49.8 57.8 61.3 62.3 64.1 65.4 66.4 67.3 67.3 67.8 68.2 68.8 69.3 69.7GE 30001 48.7 52.2 60.5 644.4 65.5 67.5 68.8 69.9 71.1 71.1 71.6 72.0 72.6 73.1 73.5

GE 25001 51.1 54.8 63.7 67:8 68.8 70:8 72.2 73.2 74.44 74.44 74.9 75.3 75.9 76.4 76.9C) GE 20001 53.7 57.6 66.7 71.1 72*2 7443 75.6 76.7 77.9 77.9 784 78.8 79.6 81,0 80.5

GE 18001 53.7 57.6 66.7 71.1 72.2 74.3 75.6 76.7 77.9 77.9 78.4 78.8 79.6 8 :.c 80.5GE 1SOG 55.2 59:3 69.0 74.0 75.2 77.3 78.7 79.7 80.9 8 .9 81.4 81.8 82.6 83.1 83.5GE 12001 15.8 60.1 70.0 75.3 76.6 78.8 80.3 81.4 82.6 82.6 83.1 83.5 844.3 84.7 85.2

GE 10001 56.7 61.0 71.0 76.7 78.2 80.1 82.3 83.5 84.7 84.7 85.2 85.6 86.4 86.8 87.3C GE

901 56.7 61.0 71.0 77.0 78.5 80.8 82.6 83.8 85.0 85.0 85.5 85.9 86.7 87.1 87.6

GE 800 56.9 61.1 71.3 77.6 79.1 81.4 83.2 84.4 85.6 85.6 86.1 86.5 87.3 87.7 88.2GE 7u110 57.2 62.C 72.2 78.5 80.0 82.3 84.1 85.3 86.7 86.7 87.1 87.6 084.4 89.8 89.3GE 6001 57.5 62.5 73.5 80.0 81.8 844.1 86.2 87.6 89.0 89.0 89.4 89.9 90.6 91.1 91.5

GE EGo 57.5 62.S 73.7 8.5 82.S 84.9 87.0 88.4 89.7 89.9 90.1 90.9 91.7 92.3 92.7GE 4001 57.6 62.6 73.8 80.8 82.8 85.2 87.7 89.3 90.8 90.9 91.5 92.0 92.7 93.3 93.8GE 3001 57.6 62.6 7440 8J.9 82.9 85.8 88.4 90.0 91.7 91.8 92.6 93.0 93.8 94.9 95.9GE 2LO S7.6 62.6 74.3 81.2 83.2 86.1 88.7 90go 92.1 92.3 93.2 93.9 94*9 96.1 97.9

I GE 1001 57.6 62.6 74.3 81.2 83.2 86.1 88.7 90.5 92.1 92.3 93.2 94.1 95.2 96.5 100.0

GE 0 37.6 62.6 714.3 812 83.2 86.1 88.7 90. 92.1 92.3 93.2 94.1 95.2 96.5 1000.............................................................. I.....:3...........................


._2

OGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ILCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURSILSTI: 060L-0800

CEILING VISIBILITY IN HUNDREDS OF METERSIN GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 '.0 32 24 20 16 12 10 a 5 4 0

NO CEIL I 24.2 25.6 28o9 31.4 31.6 32.9 33.4 33.6 33.6 33.6 33.6 33.6 33.6 33.7 34.0

GE 200001 28.3 30.0 34.3 36.9 37.1 38.5 39.2 39.3 39.3 39.3 39.5 39.5 39.5 39.6 39.9GE 180001 28.3 30.0 3403 36.9 37.1 38.5 39.2 39.3 39.3 39.3 39.5 39.5 39.5 39.6 39.9GE 160001 28.3 30.0 34.3 36.9 37.1 38.5 39.2 39.3 39.3 39.3 39.5 39.5 39.5 39.6 39.9GE 140001 28.5 30.1 34.4 37.1 37..4 38.8 39.5 39.6 39.6 39.6 39.8 39.8 39.8 39.9 40.2GE 120001 28.6 30.3 34.5 37.3 37.6 38 .9 39.6 39.8 39.8 39.8 39.9 39.9 39.9 40.0 40.3

GE 100001 0.4 32:0 36.5 39.6 39.9 41.3 42.1 42.2 42:2 42.2 42.4 42.4 42.4 42.5 42.8GE 90001 3008 32.6 37.3 40.4 40;7 42.1 42.9 43.1 43.1 43.1 43.2 43.2 43.2 43.3 43.6GE 80001 35.2 370 42.1 45.4 4507 47.2 48.0 48.1 48.3 48.4 48.6 48.6 48.8 49.0 49.2GE 70001 37.3 39.1 44.3 47.6 47.9 49.4 50.2 50.3 50.5 50.6 50.8 50.8 51.0 51.2 51.4GE 60001 37.3 39.1 'W'.3 47.6 47.9 49.4 50.2 50.3 50.5 50.6 50.8 50.8 51.0 51.2 51.4

GE 50001 38.8 40.7 46.6 50.1 50.5 52.1 53.1 53:2 53:4 53.5 53.6 53.6 53.9 54.1 54.3(. GE 45U5Uo 39.8 41.7 48.3 51.9 52.3 53.9 54.9 55.0 55.2 55.3 55.4 55.4 SS.7 ss8 56.1

GE 40001 4l.8 44.0 51.3 55.3 55.8 57.6 58.7 59.1 59.4 59.6 59.7 59.7 60.0 61.1 60.41GE 3SOO1 44.3 416.6 54.3 58.6 59.1 61.1 62.2 62.6 62.9 63.0 63.1 63.1 63.4 63.5 63.8GE 33001 49.2 51.6 59.S 64.1 64.8 66.7 68.0 68.4 68.6 68.8 68.9 69.1 69.3 69.5 69.7

GE 25001 50.9 53.2 61.5 65.9 66.6 68.5 69.7 10.3 70.6 70.7 70.8 71.0 71.3 71.4 71.7c GE 20001 52.4 54.7 63.S 68.0 68.8 70.7 71.9 72.5 72.08 72.9 73.0 73.2 73.5 73.7 74.0

GE 18001 52.4 54.7 63.8 68.2 69.1 71.0 72.2 72.0 73.0 73.2 73.3 73.5 73.7 74.0 74.3GE 15001 54.5 57.6 67.7 72.2 73.2 75.1 76.5 77.0 77.3 77.4 77.6 77.7 78.0 78.4 78.7

C GE 12001 55.6 59.0 69.6 74.4 75.4 77.3 78.7 79.2 79.5 79.6 79.8 79.9 83.2 81.6 80.9

GE 10001 57.1 60.5 71.7 76.9 77.9 79.9 81.3 82.0 82.3 87.4 82.5 82.7 82.9 830 83.6- GE 9001 57.4 60.8 72.2 77.6 78.7 80.9 82.3 83.1 83.4 83.5 83.6 83.8 84.0 84.5 84.7GE IUO 57.8 61.2 72.9 79.0 80.1 82.3 83.8 84.6 94.9 85.0 85.1 85.3 85.6 86.0 86.2

GE 7Col 58.0 61.5 73.3 79.6 8.7 83.1 84.7 85.7 86.0 86.1 86.2 86.4 86.7 87.1 87.3GE 6001 58.2 61.8 73.7 80.2 81.6 84.5 86.7 87.8 88.0 88.2 88.3 88.4 88.7 89.1 89.4

GE 500l 58.3 62.3 74 .4 81.4 83.4 86.4 88.7 90.0 90.5 90.8 90.9 91.2 91.6 92.0 92.3o GE 4001 58.3 62.4 74.6 81.8 83.8 86.8 89.,4 90.9 91.7 92.0 92.2 92.4 92.8 93.3 93.8GE 3001 58.3 62.4 74.6 81.8 83.8 86.9 89.7 91.5 92.4 92.7 92.6 93.5 94.5 95.0 96.4GE 200l 58.3 62.4 746 81.8 83:8 86.9 89:8 91.6 92.7 93.4 93.7 94.6 95.7 96.6 98.5

gGE 100 58.3 62.4 74.6 81.8 83.8 86.9 89.8 91.6 92.7 93.4 93.8 94.9 96.1 97.2 100.0

GE 01 58.3 62.4 74.6 81.8 83.8 86.9 89.8 91.6 92.7 93.4 93.8 94.9 96.1 97.2 100.0


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREGUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

USAFCTAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURStLSTI: 0900-1100

CEILING VISIBILITY IN HUNDREDS OF METERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 I0 32 ?4 20 16 12 10 8 5 9 0

C) NO CEIL I 25.8 26.7 28. 28.8 28.8 28.9 28.9 28.9 28.9 28.9 28.9 28.9 28.9 28.9 28.9

GE 200001 !1.1 32.3 34.9 34.8 39.8 35.0 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35.1o GE 180001 i1.1 32.3 39.9 39.8 39.8 35.0 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35.1GE 160001 !1.1 32.3 34.9 34.8 39.8 35.0 35.1 35.1 35.1 35.1 35.1 35.1 35.1 3 5.1 35.1GE 1140001| 31.9 32.5 39.7 35.1 35.1 35.2 35.3 35.3 35.3 35.3 35.

3 35.3 35.3 36.3 36.3

GE 120001 12.0 33.3 35.5 35.9 35.9 36.0 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1

GE 100001 33.4 34.7 37.0 37.5 37.7 37.8 37,9 37.9 37.9 37.9 37.9 37.9 37.9 37.9 37.9GE 90001 39.3 35.6 37.9 38.4 38.6 38.7 38.8 38.8 38.8 38.8 38.8 38.8 38.8 38.8 36.8GE 80001 37.7 38.9 91.9 92.9 425 92:7 92:8 92.8 92.8 92.8 92:8 92.8 92:8 42.8 92.8GE 7000 39.1 90.5 93.9 99.1 99.5 99.6 499.7 997 9.7 94.7 94.7 94.7 149.7 97, 7 9.7GE 6CO 39.7 41.1 4.1 14.7 96.51 95.2 45.9 9.4 45.4 45.4 5.9 45.9 95. 45.9 4S.4

GE 50001 91.0 92.5 46. 97.2 97.6 47.7 47.8 97.9 48.1 98.1 98.1 98.1 98.1 98.1 98.1GE 451 0 1 91.9 93.1 47.3 98.1 98.5 48.6 48.7 98.8 99.0 49,17 49.( 99.0 99.0 499.0 49.0GE 40001 97.4 49.1 53.6 59.6 55.0 55.3 55.5 5.7 55.8 55.8 SS.8 5568 55.8 5.8 5S.8GE 35001 53.2 59.9 59.6 60.8 61.'3 61.6 62.0 62.1 62.Z 62.2 62.2 6Z.2 62.2 62.2 62.2GE 30001 62.5 60.3 69.2 70.4 71.0 71.3 71.7 71.9 72.0 72.0 72.0 72.0 72.0 72.0 72.0

GE 25001 65.8 67.7 73.0 79.9 74.9 75.3 75.7 75.8 76.0 76.0 76.0 76.0 76.0 76.0 76.0GE 20UOI 69.5 71.6 76.9 78.3 78.8 79.2 79.6 79.7 79.8 79.8 79.8 79.8 79.8 79.8 79.8GE 18001 69.8 71.9 77.2 78.7 79.2 79.6 79.9 80.1 80.2 80.2 80.2 80.2 80.2 81.2 80.2GE 15101 72.8 76.3 81.6 83.9 83:9 8143 89.7 89.8 85.0 85.0 85.0 85.0 85.0 85.0 85.0

( GE 12001 719 77.6 89.2 865 87.0 87.5 87.9 88.0 68 2 8 82 8 82 82 88.2 82 88.2

GE 10001 75.8 78.8 86.2 89.1 89.8 90.6 91.3 91.4 91.8 91.8 91.8 91.8 91.8 91.8 91.8GE 9GOI 76.1 79.0 86.8 89.7 90.5 91.6 92.3 92.9 92.8 92.8 92.8 92.8 92.8 92.8 92.8GE 8001 76.1 79.3 87.7 91.0 91.8 92.9 93.6 93.7 99.1 99.1 94.1 99.1 94.1 99.1 94.1GE 70i 76.3 79.6 88.2 91.6 92.4 914.0 99.6 94.9 95.2 95.2 95.2 95.2 95.2 95.2 95.2GE 6001 76.3 79.8 88.9 92.0 92.8 99.5 95.2 95.5 95.9 95.9 95.9 95.9 95.9 95.9 95.9

GE 5001 16.3 79.9 88.7 92.9 93.3 95.1 96.3 96.7 97.0 97.0 97.0 97.0 97.0 97.0 97.0GE 4ou I 76,3 79.9 88.7 92.9 93.3 95.1 96.7 97.2 97.8 98.2 99.3 98.1 98.1 98.1 98.1GE 3001 76.3 79.9 88.7 92.9 93.3 95.4 97.0 97.7' 98.6 98.0 99.0 99.1 99.2 99.9 99.9GE 2001 76.3 79.9 88.7 92.9 93.3 95.4 97.0 97.7 98.6 98.8 99.D 99.5 99.7 101.0 100.0

C GE 1o1 76.3 79.9 88.7 92.4 93.3 95.*e 97.0 97.7 98.6 98.8 99.0 99.5 99.7 10.0 100.0

GE DI 76.3 79.9 88.7 92.9 93.3 95.4 97.0 97.7 98.6 98.8 99.0 99.5 99.7 100.0 100.0


-.- ' - .. / .. -- I m I7 -• m -~ - -. .

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFE TAC FROM POURLY OBSERVATIONSAIR WEAT4ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME. RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORDz 7B-B3.S-87MONTH: MAY HOURS(LSTI: 1200-1,00.... .... . ..... .. .... ... ... .... ...... . .... .. ....

CEILING VISIBILITY IN UNDREDS OF MEEIRSIN I 61 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

O FEET 1 160 90 80 60 48 80 32 28 20 16 12 10 8 S 8 0

NO CEIL 1 27.5 27.8 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0 28.0

GE 200001 34.2 35.2 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1GE 160001 38,5 35.5 36.8 36.4 36.4 36.8 36.8 36.8 36.8 36.8 36.8 3608 36.4 36.4 36.8GE 160001 38.5 35.5 36.8 36.8 36.4 36.8 36.8 16.4 36.4 36.8 36.4 36.8 36.4 36.4 36.4GE 180001 34.7 35.7 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6E G 12000| 35.0 36.0 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8 36.8

GE IOOOU J 37.6 38.6 39. 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.6GE 90001 38.3 39.3 80.2 40.3 80.3 40.3 40.3 40.3 40.3 0.3 410,3 80.3 40.3 4 0.3 80.3GE 80001 81.3 812.4 83.4 83.S 83.7 43.7 83.7 43.7 83.7 83.7 83. T 83.7 83.7 % I.7 3.7GE 70001 81.9 43.2 88.2 88.8 88.9 884.9 148.9 40.9 884.9 884.9 88.8 88.9 88.9 88.9 88.9GE 60001 81.9 83.3 84.3 88.9 85.0 85.0 85.o 83.0 8s.0 85.0 85.0 85.0 85.0 5 1.0 85.0

GE 50001 88.8 86.3 87.4 88.0 48-1 881 881 881 861 8.1 881 181 181 88.1 81GE 8SO01 q5.8 47.3 88.8 89.0 9.'3 89.3 9.3 9.93 89.3 9.3 193 8 9.3 8s 9. 3 89.3GE C001 58.1 5S.6 56.7 57.4 57.7 57.7 57.8 57.8 57.8 57.8 57.8 57.6 S7.8 57.8 S7.6GE 35001 62.5 6t.0 65.4 66.3 66.5 66.5 66.6 66.6 66.6 66.6 66.6 66.6 66.6 66.6 66.6GE 30001 73.9 75.9 78.8 79.3 79.5 79.5 79.7 79.8 79.8 79.8 79.8 79.8 79.8 79.8 79.8

GE 25001 77.7 79.7 82.3 83.1 83.8 83.8 83.5 83.6 83.6 83.6 83.6 83.6 83.6 8 !.6 A3.6GE 20001 80.1 82.5 85.5 86.8 86'6 86.7 86.8 87.0 87.0 87.0 87.0 87.0 87.0 87.0 81.0GE 18GO 81.3 83.9 86.8 87.7 88.0 88.1 86.2 88.3 88.3 68.3 88.3 88.3 8.3 88.3 88.3GE SO 83.6 86.6 90.4 91.8 91.7 91.8 92.1 92.2 92.2 92.2 92.2 92.2 92.2 92.2 92.2o GE 12001 84.8 87.6 91.7 92.8 93.3 93.8 93.7 93.8 93.8 93.6 938 93. 93.8 93.8 38

GE 1000) 85.1 88.5 93.1 9.4 95.0 95.3 95.8 95.9 95.9 95.9 05.9 95.9 95.9 9S.9 95.9GE 9001 85.2 88.6 93.2 98.7 95.3 95.8 96.8 96.5 96.5 96.5 96.5 96.5 96.5 96.5 96.SGE 8U0 85.2 88.7 93.3 98.8 95.,. 96.0 96.7 96.8 96.8 96.8 96.8 96.8 96.8 96.8 96.8GE 7001 85.8 88.8 93.4 9.9 95.7 96.8 97.1 97.3 97 84 97.8 97.8 97.8 97.8 97.8 97.8GE 6001 85.8 88.8 93.5 95.0 95.8 96.7 97.9 98.0 98.1 98.1 98.1 98.1 98.1 98.1 98.1

GE 5001 85.8 88.8 93:5 95.2 96.0 97:1 .8,: 989 99.0 99.0 99.0 99.0 9903 99.0 99.0oc GE 80 85.8 88.8 93.5 95.2 96.D 97.1 98.8 98* 99.5 99.6 99.8 99.8 99.8 99.8 99.6GE 3001 85.8 88.8 93.5 95.2 96.0 97.1 968 98.9 99.5 99.8 100.0 100.0 100.0 103:0 100.0GE 2001 65.8 868 93.5 95.2 96;0 97.1 98.8 98.9 99.5 99,8 In0.0 100.a 100.0 1on00 100.0o GE 1010 85. 88.8 93.5 95.2 96.0 97.1 98.8 98.9 99.5 99.8 100.0 103.0 100.0 100.0 100.0

GE aD 8s. 88.8 93.5 95.Z 96.0 97.1 98.8 98.9 99.5 99.8 100.0 100.0 100.0 100.0 IC.0.............................................. .............................................................................................

TOTAL NUMBER OF OOSERVATIONS: 806

-- -m.4n.m IIdlJlld il MBiI

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETA G FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO9BUPY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURS(LSTI: 1500-1700

....................................................................................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN 610 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE0 FEET 1 160 90 a0 60 '8 4 0 32 2' 20 16 12 10 8 5 4 0

.. . . . .. . . . . .. . . . .. . . . . .. . . . .. . ..... ; • 0 o o .. .. . .. .. . .. . .. .. ..................•.. a g.. ....

NO CEIL ] 30.1 30.6 31.2 310Z 31.2 31.2 31.2 31.2 31.2 31.2 31.2 31.2 31.2 31.2 31.2

GE 200001 3 7

. 0 37.9 38.5 38.5 38.5 38.5 38.5 38.5 38.5 39.5 38.5 38.5 38.5 38.5 38.5) GE 18000 37.3 36.5 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 39.0

GE 16000 37.3 38.5 39.0 39.0 39.0 39.0 39.0 39.0 39.0 390t 39.0 39.0 39.0 39.0 39.0GE 190001 37.4 38.6 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1 39.1

.. GE 120005 38.3 39.5 10.0 'e0.0 C.0 '0.0 '0.0 40.0 0.0 0.0 0.0 '0.0 '.0.0 4.0 40.0

GE 100001 '1.3 .2.5 43.0 '.3.0 43.0 43.0 43.0 43.0 '3.0 43.0 43.0 43..0 3.0 '.3.0 43.0

GE 9C00 '1.9 '.3 0 43.5 43.5 43.5 '3 3. 5 '3.5 '3.5 3.5 5 43.5 '.335 33.5 ' 3.5 43.5GE 80001 '7.3 '.8.5 '.9.2 '9.2 '9.2 .9.2 '9.2 49.2 '9.2 49.2 '9.2 '9.2 9.2 '9:2 '9.2GE 70000 7.6 48.8 9.'. 49.4 49.' 49. 49.4 49 9. 49. 49.'4 9.' '9.4 9.4 .. 49.4 49.'GE 6000 46.1 '9.3 49.9 99.9 99.'9 '.9.9 99.9 '.9.9 '9.9 .9.9 '.99 .9.9 .9.9 '.99 99

GE 50005 51.08 53.3 S4.0 54.0 54.0 5'.o0 54.0 59.0 4.0 59.0 54.0 54.0 4.0 54.0 59.0GE '5001 55.' 57.z 58.1 58.3 58.3 58.3 58.3 58.3 58.3 58.3 58.3 58.3 58.3 59.3 58.3GE 40001 63.5 65. 66.5 66.6 66.6 66.6 67.0 67.0 67.0 67.0 67.0 67.0 67.0 67.0 67.0GE 35001 11.6 73.5 75.0 75.1 75.'1 75.1 75.5 75.5 75.5 7.S5 75.5 7S.5 75.5 75.5 75.5GE 30001 80.8 83.3 85.1 85.3 8503 85.3 85.8 85.8 85.8 85.8 85.8 85.8 85.8 85.8 85.8

GE 25001 890.5 87.1 89.8 90.0 90.0 90.0 90.5 90.5 90.5 90.5 90.5 90.5 90.5 90.5 90.5GE 2C001 85.5 88.1 91.1 91.3 91;3 91.' 92.0 92.0 92.0 92.0 92.0 92.0 92.0 92.0 92.0

GE 18005 85.9 88.5 91.5 91.7 91.7 91.8 92.' 92.' 92.'4 92.' 92.' 92.'4 92.' 92.' 92.'GE ISUO1 86.7 89.3 92.'4 93.0 93.0 93.5 99.1 94.1 94.1 99.1 9'4.1 94.1 99.1 99.1 99.1GE 12005 86.8 89.6 92.7 93.' 93.'4 93.9 99.5 99.5 99.5 94.5 99.5 94.5 99.5 99.5 94.5

GE lboi 86.8 89.7 93.0 99:0 94:0 98.5 95:' 95:4 5.'4 95:'4 95. 95:4 950' 950' 95.'.E G 900 900 93.9 99.5 99.7 95.2 96. 1 961 96.1 96.1 96.1 96.1 96.1 96.1 96.1

GE 8005 97.1 90.0 93.5 994.7 99.o8 95.'. 96.3 96.3 96.3 96.3 96.3 96.3 96.3 96.3 96.5

GE 7OO5 87.2 90.1 93.7 95.3 95.6 96.5 97.8 97.8 97.8 97.8 97.8 97.8 97.8 97.8 97.9C' GE 6001 87.2 90.1 93.9 95.' 95.7 96.7 98.2 98.2 98.2 98.2 98.2 98.2 98.2 98.2 98.3

GE SOO 87.2 90.1 94.0 95.7 96:0 97.3 99:0 99:0 99.1 99.1 99.1 99.1 99.1 99.1 99:2GE '.001 87.2 90.1 99.0 95.7 96.0 97.3 99.0 99.0 99.2 99.2 99.2 99.2 99.2 99.2 99.3GE 3005 87.2 90.1 99.0 95.7 96.0 97.3 99.0 99.1 99.6 99.6 99.6 99.6 9906 99.6 99.7GE 2001 87.2 90.1 99.0 95.7 96.0 97.3 99.0 99.1 99.7 99.7 99.7 99.9 99.9 99.9 100.0GE loo 87.2 90.1 94.0 95.7 96.0 97.3 99.0 99.1 99.7 99.7 99.7 99.9 99.9 99.9 100.0

GE 0. 87.2 90.1 99.0 95.7 96.0 97.3 99.0 99.1 99.7 99.7 99.7 99.9 99.9 99.9 1000o0.0.00 .8..09 0:• ... . o .. 0 •... .. 0 . .... ... .... .e 0 . o e o o .0 .

TOTAL NUMBER OF OBSERVATIONS: 767C.

* L.-I m. .8Ii m mJi um u

- GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURPENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR wEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURSiLSTI: 180-2000

CE IL ING VISIBILIIY IN HUNDREDS OF METERSIN 1GI GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

O FEET I 160 90 A0 60 98 90 32 29 20 16 12 10 B 5 4 0

o NO CEIL 1 39.0 39.9 90.8 41.0 9143 91.3 91.3 91.3 41.3 .1.3 V1.3 91.3 41.3 41.3 41.3

GE 200001 45.7 96.8 97.9 98.9 99.0 99.1 99.1 9.1 99.1 99.1 99.1 49.1 491 99.1 4916) E 18000 96.0 97.3 98.9 98 .8 99.5 96 99.6 99.6 99.6 99.6 99.6 96 99.6 99.6 99.6GE 160001 96.0 97.3 98.9 98.8 99.5 99.6 99.6 99.6 99.6 99.6 99.6 99.6 49.6 49.6 49.6GE 190001 96.0 97.3 98.4 N8.8 99.5 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6 49.6GE 12C001 97.3 98.5 99.6 50.1 50.7 50.9 50.9 50.9 50.9 50.9 50.9 50.9 50.9 50.9 50.9

GE 100001 99.8 51:3 52.6 53.1 53.7 53.8 53.8 53:8 59.0 59.0 54.0 59.0 54.0 54.0 59.0' GE 90001 50.9 52.9 53.8 59.3 54.9 55.1 55.1 55.1 55.2 55.2 55.2 55.2 55.2 55.2 55.2

GE 80001 55o6 57.3 59.2 59.8 60.6 60.7 60.7 60.7 60.9 60.9 60.9 60.9 60.9 60.9 60.9G E 7C001l 56:2 57:9 59.8 60.4 61.2 61.3 61.3 bl 3 61.;5 61.5 61.5 61.5 61.5 61.5 61.5

G 6CO01 56.5 58.2 60.1 60.7 61.5 61.7 61.7 61.7 61.8 61.8 61.8 61.8 61.8 61.8 61.8

GE 50001 59.9 62:0 63.8 69.6 65.9 65.6 65:6 65.6 65:7 65.7 65.7 65:7 65:7 65.7 65.7GE 'oo501 63.7 65.9 67.9 68.9 69.6 69.8 69.8 69.8 70.0 70.0 70.0 70.0 70.0 73:0 70.0GE 40001 69.6 72.0 79.3 75.3 76.1 76.2 76.9 76.9 76.5 76.5 76.5 76.5 76.5 76.5 76.5GE 35001 75.6 77.9 80.6 81.5 82.3 82.5 82.8 82.8 82.9 82.9 82.9 82.9 82.9 82.9 82.9

I-Q GE 30001 79.7 82.3 85.3 86.7 87.5 87.9 88.6 88.6 88.7 88.7 88.7 88.7 88.7 88.7 88.7

GE 25001 81.5 89.2 87.6 89.0 89.8 90.3 90.9 90.9 91.1 91.2 91.2 91.2 91.2 91.2 91.2GE 20001 82.0 89.7 88.6 90.1 91.l 91.5 92.3 92.3 92.5 92.6 92.6 92.6 92.6 92.6 92.6GE 18001 82;3 85.0 88.9 90.5 91.9 91.9 92.6 92.6 97.8 93.0 93.0 93.0 93.0 93.0 93.0GE 15001 e2.6 BS. 89.7 91.5 92.5 93.0 93.7 93.7 93.9 99.1 99.1 99.1 99.1 99.1 99.1GE 12001 82.8 85.8 90.3 92.8 93.7 99.2 95.1 95.1 95.5 95.6 9S.6 95.6 95.6 95.6 95.6

GE 1OUOI 83.3 86.2 91.1 93.7 99.8 95.3 96.2 96.2 96.6 96.7 96.7 96.7 96.7 96.7 96.7" GE 9001 83.3 86.2 91.1 93.9 95.0 95.5 96.9 96.9 96.7 96.9 96.9 96.9 96.9 96.9 96.9

GE 8001 83.3 86.2 91.1 93.9 95.0 95.5 96.6 96.7 970 97.2 97.2 97.2 97.2 97.2 97.2GE 70J1 03.3 86.2 91.1 99.9 95.5 95.9 97.2 97.3 97.8 98.0 98.0 98.0 98.0 98.0 98.0

0 GE 6001 83.3 86.2 91.1 99.5 95.6 96.1 97.3 97.5 98.0 98.1 98.1 98.1 98.1 98.1 98.1

GE 5001 13.3 86.2 91:1 99.8 95.9 96.7 98.l 98.9 498.9 99.1 99.1 99.1 99.1 99.1 99.1' GE 'UOI 83.3 86.2 91.1 998 95.9 96.7 98.1 98.9 98.9 99.1 99.1 99.2 99.2 99.2 99.2

GE 3001 93.3 86.2 91.1 99.8 95.9 96.7 98.1 98.4

99.2 99.9 99.9 99.5 99.5 99.5 99.5

GE 2001 R3.3 86.2 91.1 99.8 95.9 96.7 98.1 98.9 99.9 99.8 99.8 100.0 100.0 100.0 100.0C) GE 1001 83.3 86.2 91.1 99.8 95.9 96.7 98.1 98.9 99.9 99.8 99.8 100.0 100.0 100.0 100.0

GE 01 83.3 86.2 91.1 99.8 95.9 96.7 98.1 98.9 99.9 99.8 99.8 100.0 100.0 100.0 1000

................................................................................... .......................................

TOTAL NUMBER OF OBSERVA1ONS: 639

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR wEATHER SERVICE/RAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURSILSI): 2100-2300

. .. .. ............................................. ................. ....... ............ .. .. .... ............ . . .

CE ILING VISIBILITY IN HUNDREDS Of METERSIN T GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEE r 160 90 80 60 48 '40 3Z 2 20 16 12 10 8 5 N a

3 - NO CEIL 40.9 43.0 l44.3 44.9 45.1 '46.1 46.3 46.4 46.4 46.4 46.4 46. 6 46.44 '46.4

GE 200001 46.8 49.7 51.8 52.4 52.6 53.9 54.1 54.3 54.3 54.3 54.3 54.3 54.3 54.3 54.3

GE 180001 146.8 49.7 51.8 52.4 52.6 53.9 54.1 54.*3 54.3 54.3 54.3 54.3 54.3 51'.3 5'4.3GE 160001 46.8 49.7 51.8 52.4 52.6 53.9 5'4.1 54.3 54.3 54.~3 544.3 54.3 S4.3 5'4.3 54.3GE 180001 46.8 49:7 51.8 52.:4 52.6 53.9 54:1 54:3 543 54.3 55903 54:*3 54:3 54:*3 54:3

GE 1200 '46.8 49.7 51.8 sz24 52.6 53.9 59.1 54.3 54.3 54.3 154.3 54.3 54.3 54.3 54.3

GE 100001 49.3 S2.4 54.5 55.1 55.3 56.6 56.8 57.0 57.0 57.0 57.0 S7.0 57.0 57.0 57.0GE 90001 50.3 S3.4 55.5 56.0 56.2 57.6 57.8 58.0 58.0 58.0 58.0 58.0 58.0 58.0 58.0GE S0Cal 55.9 58.9 61.8 62.6 62.'8 64.1 644.3 64.5 644.5 64.5 64.5 64.5 64.5 64.5 64.SGE 7C001 56.2 59.3 62.4 63.1 63.3 64.7 64.9 6S.1 65.1 65.1 65.1 65.1 65.1 65.1 65.1GE 60001 56.4 59.5 62.6 63.3 63.5 64.9 65.1 65.3 65.3 6S.3 65.3 65.3 65.3 65.3 65.3

GE 50001 59.3 62.4 65.5 66.2 66.4 67.8 67.9 68.1 68.1 68.1 68.1 68.1 68.1 68.1 68.1

GE 45001 61.6 64.7 67.8 68.5 68.7 70.1 70.2 70.4 70.4 70.4 70.04 70.4 70.4 70.4 70.4GE 40001 67.0 70.8 74.3 75.0 75.2 76.6 76.8 77.0 77.0 77.0 77.0 77.0 77.0 77.0 770

GEr 35001 70.2 74.5 77:9 79.1 79.3 80.6 81.0 81.6 81.6 61.6 81.6 81.6 81.6 81.6 81.6GE 30o01 73.3 77.5 81.4 82.9 8301 85 84.8 854 85.44 85.44 85.4 85.8 85.4 85.41 85554

GE 2S001 14.1 78.S 82.5 811.1 84.3 85.6 86.0 86.6 86.6 86.6 86.6 86.6 86.6 86.6 86.6GE 20001 74.7 7981 83.5 85.6 85;8 87.1 87.S 88,1 8801 88.1 84.1 8801 8.1 8A.1 88,1

GE 18j01 7S.2 79.7 84.3 86.6 86.8 88.1 88.5 89.1 89.1 89.1 89.1 89.1 89.1 89.1 89.1

GE 155.31 75.6 80.0 85.0 8707 87.9 89.3 89.6 90.2 90.2 90.2 90.2 90.2 90.2 9..2 9C.2

6.E 12001 76.0 81.4 86.8 90.'4 90.8 92.1 92.5 93.1 93.1 93.1 93.1 93.1 93.1 93.1 93.1

GE 10001 77.0 82.7 88.1 91.7 92.1 93.5 93.9 94.'4 94.4 94.4 94.4 944.4 944.4 94.4 94.4C GE 9001 77.q 83.1 88.5 92.1 92.5 93.9 944.2 94.8 94.8 944.9 94.8 9'..8 94.8 94.8 944.8

GE 8001 11.5 83.3 89.1 92.7 93.1 94.4 95.0 96.2 96.2 96.2 96.2 96.2 96.2 96.2 96.2GE ?ol 77.5 83.3 89.3 92.9 93.5 94 .8 95.6 96.9 96.9 96.9 96.9 96.9 96.9 96.9 96.9

C GE 6001 17.5 83.3 89.6 93.3 93.9 95.2 96.0 97.3 97.3 97.3 97.3 97.3 97.3 9T.3 97.3

GE SO~JI 77.5 83.3 89.6 93.5 94.2 95.8 96.5 97.9 97.9 97.9 97.9 97.9 97.9 97.9 91.9GE 4001 77.7 83.5 89.8 93.7 94.4 96.0 96.7 98.1 '98.1 98.1 98.1 98.1 98.1 98.1 98.1GE 3031 77.7 83.5 90.0 93.9 94:6 96.2 96.9 98.3 98.3 98 98.3 98.5 98.5 98.5 98.5GE 2001 77.7 83.5 90.0 93.9 94.6 96.2 96.9 98.3 98.7 99.0 99.2 99:6 99.8 99.8 I .0GE 1001 71.7 $3.5 90.0 93.9 94.6 96.2 96.9 98.3 98.7 99.0 99.2 99.6 99.8 99.8 100.0

GE 01 77.7 83.5 90.0 93.9 94.6 96.2 96.9 98.3 98.7 99.0 99.2 99.6 99.8 99.8 100.0

...............................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS: S21

I.

9 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFElAC FROM HOURLY OBSERVATIONSAIR .EAIIER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNIIED KINGDOM PERIOD OF RECORD: 78-83,85-87MONTH: MAY HOURS(LSTI: ALL

.. .. .. .... .. .. ... .. ...8 0 ... 0 "; o e ee 0 • 0 ... . . .. . . .. . . .. . . . .. . . .. . . .. .. .. . . .

CEILING VISIBILITY IN HUNDREDS OF MEIERS

IN I 01 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET 1 160 90 80 60 48 40 3Z 24 20 16 12 10 8 5 4 0

0 NO CEIL I 30.9 31.9 33.7 34.6 34.8 35.2 35.4 35.5 35.5 35.5 35.6 35.7 35.7 35.7 35.8

GE ZOOOI 36.3 37.7 40.0 41.0 41.2 '41.7 42.1 42.2 42.3 42.3 42.4 42.5 42.5 42.6 42.7GE 180003 16.4 37.9 '40.2 41.1 '41.3 41 .9 '42.3 42.4 42.5 '42.5 42.6 42.6 42.7 42.7 42.8GE 16tUD0 36.4 37.9 40.2 41.1 '1..3 '41.9 42.3 4z4 42.5 42.5 42.6 42.6 42.7 42.7 42.8

GE 14000: 36.5 38.0 40.3 41.3 41.5 42.0 42.4 42:5 42.6 42.6 42.7 42.8 42.8 42.9 43.0GE 120001 3700 38 5 40.8 41.7 42.0 42.S 42.9 43 0 43.1 43.1 43.Z 43.3 R43.3 43.3 43.5

GE 100001 39.1 40.7 43.1 44.1 44,4 44.9 45.3 45.5 45.6 45.6 45.7 45.7 45.8 45.8 5.9GE 9c00 39.8 41.5 43.9 45.0 45.2 45.8 46.2 46.3 46.4 46.4 46.5 46..6 46.6 46.7 46.8GE 80001 43.7 5.4 48.4 49.5 49.8 50.3 50.8 50.9 51.0 51.0 51.1 61.2 51.3 51.4 51.5GE 70001 44.5 46.3 49.3 50.5 50.8 51.4 51.8 52.0 52.1 52.1 52.2 52.3 52.4 52.5 52.6GE 60001 44.8 46.5 495 50.8 51.1 51.7 52.1 52.2 52.,3 52.4 52.5 62.5 52.6 52.7 52.8

GE 50001 47.1 49.0 52.4 53.7 54.0 54.6 . 56 I 55.3 55.4 55.4 55.5 55.6 55.7 55.8 55.9GE 45001 49.3 51.3 54.9 56.2 56.6 57.2 57.7 57.9 58.0 S8.0 58.1 58..2 58.3 58.4 58.5GE 40ooo 55.1 57.4 61.2 62.8 63.2 63.9 64.5 64.7 64.9 64.9 65.0 65.1 65.2 65.3 65.4GE 35001 60.2 62.6 66.8 68.5 68.9 69.6 70.3 70.6 70.8 70.8 70.9 70.9 71.1 71.1 71.3GE 30001 66.5 69.2 73.9 75.8 76.2 77.0 77.8 78.1 78.3 78.3 78.4 78.5 78.6 78.7 78.8

GE 25001 69.1 71.9 76.9 78.9 79."3 80.1 80.9 81.2 81.4 81.4 81.6 81.6 81.7 81.8 82.0GE 20001 70.9 73.9 79.2 81.3 81.8' 82.6 83.4 83.7 84.0 84.0 84.1 84.2 84.3 84.4 84.5GE 18001 71.3 74.3 79.7 81.8 82.'3 83.1 83.9 84.2 84.5 84.5 84.6 84.7 84.8 8'4.9 85.0GE 15001 72.8 76.1 82.2 84.6 85.1 86.0 86.9 87.2 87.4 87.4 87.5 87.6 87.7 87.9 88.0

C GE 120i)| 73.6 77.1 83.5 86.3 86.9 87.8 88.7 89.0 89.2 89.3 89.4 89.4 89.6 89.7 89.8

GE 10001 T14.5 78.1 84.8 87.9 88.6 89.6 90.6 91.0 91.3 91.3 91.5 91.5 91.7 91.8 91.9GE 9L01 74.6 78.3 85.1 88.3 89.1 90.2 91.3 91.6 91.9 92.0 92.1 92.2 92.3 92.4 92.5GE 8goa 74.8 78.5 85.5 89.0 89.7 90.8 92.0 92.4 92;7 92.8 92.9 92.9 93.1 93.2 93.3

GE 7001 74.9 78.8 85.9 89.6 9C.3 91.6 92.9 93.4 93.8 93.8 93.9 94.0 94.1 94.2 94.4C) GE 6031 75.0 78.9 86.3 90.0 90.9 92.3 93.8 94.4 94.7 94.7 94.9 94.9 95.1 95.2 95.3

GE 5001 75:0 79.0 86:5 90.4 91.5 93:1 94:8 95.4 95.8 95.9 96.0 96:1 96.2 96.4 96.5o GE 40u1 75.1 79,1 86.5 90.6 91.'6 93.3 95.1 95.8 96.4 96.5 96.7 96.8 9?.0 97.1 97.3GE 3I91 75.1 79.1 86.6 90.7 91.8 93.5 95.4 96.2 97.0 97.1 97.3 97.6 97.8 9 .1 98.5GE 2003 75.1 79.1 86:7 90.8 91.8 936 95:5 96.3 97.2 97.5 97.8 98.2 98.5 9.8 99.5

) GE 1003 7S1 79.1 86.7 90.8 91.8 93.6 95.5 96.3 97.2 97.5 97.8 98.2 98.6 99.0 100.0

GE o 75.1 :.9o 86.7 90.8 91.8 93.6 95.5 96.3 97.2 97.5 97.8 98.2 98.6 99.0 100.0:1 .. . - • . e.

• .. - .. , - . 000 .. : . : .. . . .. . . . ;. . 9g 6 . 9 . ....

TOTAL NUMBER OF OSERVAT*ONS: 5304

-..

T GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

USAFETAC FROM HOUqLY OBSERVATIONS

AIR WEAIHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JUN HOURSILST): 0000-O.DO

CE IL 146 VISIBILITY IN HUNDREOS OF METERS

IN I 61 GE GE GE GE GE G E GE GE GE GE GE GE GE GE GEFEE 160 90 80 6 D 48 40 32 24 20 16 12 10 8 5 4 O

NO CEIL I 22.6 34.4 38.4 39," 40.2 41.1 42.1 42.1 42.3 42.3 42.5 42.7 43.2 43.2 43.4

GE 200001 34.6 36.7 41.7 43.2 43.6 44.4 45.4 4S.4 45.6 45.6 45.9 46.1 46.5 46.5 46.7

0 GE 180001 34.6 36.7 41.7 43.2 43.6 44 .4 45.4 45.4 4S.6 45.6 45.9 46.1 46.5 46-5 46.7GE 160001 34.6 36.7 41.7 43.2 43.6 44.4 45.4 45.4 45.6 45.6 45.9 46.1 46.5 46.5 46.7GE 140001 35.1 37.1 42.1 43.6 44.0 44.8 45.9 45.9 46.1 46.1 46.3 46.5 46.9 46.9 47.1

r0 GE 120001 35.3 37.3 42.,3 43.8 44.2 45.0 46.1 46.1 46.3 46.3 46.5 46.7 47.1 47.1 47.3

GE 10000| !6.7 38.8 44.2 45.6 46.1 47.1 48.1 48.1 48.3 48.3 48.8 49.0 49.4 49.4 49.6O GE 90001 37.8 39.8 45.2 46.7 47.1 48.1 49.2 49.2 49.4 49.4 49.8 50.0 50.4 5 r!., SO.b

GE 8:00 41.3 43.4 49.0 50.4 50.8 51.9 52.9 52.9 53.1 5. 53.5 53.7 54.1 S4.1 5.4GE 7ooOl 417 43.8 49.8 51.2 51.7 52.7 53.7 53.7 53.9 53.9 54.4 54.6 55.0 SC 5.,GOE 6(1S01 42.1 . 50.2 51.7 52.1 S3.3 54.4 54.4 S4.6 54.6 55.0 SS.2 55.6 5 ,6 5.9

GE 500ol 45.2 47.3 53.9 55.4 55.8 57.3 58.3 58.3 55.5 58S. 58.9 59.1 59.5 5 -. A elGE 45C01 47.9 5?.4 57.3 58.7 59.,1 60.8 61.8 61.8 62.0 62.0 62.4 62.7 63.1 b.'.TGE 40001 54.4 57.1 64.7 66.2 66.6 68.7 69.7 69.7 69.9 69.9 70.3 70.S "1.0 7 1 ..GE 3SU01 57.3 60.0 67.6 69.1 69.5 71.8 72.8 72.8 73.0 73.0 73.4 73.7 74.1 7.

GE 300jl 60.8 64.1 72.0 73.7 74.1 76.3 78.0 78.0 78.2 78.2 78.6 78.8 79.3

GE 25001 61.0 64.3 72.4 74.1 74.5 76.8 78.4 78.4 78.6 78.6 79.0 79.3 7.7

* . GE 20GO 63.1 66.4 74.7 76.3 76.8 79.0 80.7 80.7 80.9 81,9 81.3 81.5 :. .GE 18001 63.1 66.4 74.7 76.3 76.8 79.0 80.7 80.7 80.9 8f139 8.3 815 .GE 15U0D 65.1 68.7 77.2 78.8 79.3 81.7 83.4 83.4 83.6 83.6 84.0 44.Z

GE 12001 66.8 70.5 79.0 80.7 81.3 83.8 85 85.5 85.7 85. 86.1 86.

GE 10001 68.7 72.4 81.3 83.2 84.0 86.5 88.2 88.2 88.4 80 .4. . s9.

GE 9ol 69.1 73.2 826 894.6 85.5 88.0 89.6 89.6 89.8 89.@ .C. .

GE 8001 69.5 73.7 83.0 85.1 85.9 88.4 90.2 90.2 90.S 90.. 9.v ..

GE 7001 70.3 74.s 84.2 86.3 87.6 90.2 92.1 92.1 92.3 97.3 1 .". 1GE 6001 70.3 74.5 84.2 86.7 88.0 90.7 92.5 92,5 qZ. 7 9.. 7 9 1.

GE s0|1 71.4 75.7 85.5 88.6 89.8 92.7 98.6 940.6 9%.0 9..,'- GE q 01 71.8 76.1 86.7 89.8 91.1 94.0 95.9 95.9 q9 .1 9eo(

GE 3001 72.0 76.6 87.6 90.9 92.1 95.0 96.9 96.9 41.GE 2001 72.0 76.6 87.6 90.9 92.1 95.2 97.5 9T.s -9. "GE 1610 72.0 76.6 87.6 90 .9 92.1 95.2 97.S r. . .

GE 0I 72.C 76.6 87.b 91.1 92.3 95. 97.1 ? '..................................................... °° ro e . e o * o... ... ...

TOTAL NUMBER OF OPSERVA11ONS: 482

4.

UNCLASSIFIED U AC /M4 A / iqH

W /

& 1 A

MICROCOPY RESO.UTIO TEST CHART

/r,

o

1i

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSA rET aC FROM HOURLY OBSERVATIONSAIR IMEA1NER SERVICE/NMAC

STATION NUMBER: 035623 STATION NAMEs RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JUN IOURSILSI3: 0300-0500

CEILINGVISIBIC17V IN HUNDREDS Of METERS"IN 161 GE BE GE GE GE GE GE GE GE GE GE GE GE GE GE

OFEET I160 90 80 60 88 410 32 28 20 16 1? 10 B 5 81 0

N.~ CEIL I 17.3 19.3 22.1 26.8 21.6 29.8 31.3 32.2 33.5 33.9 34.1 38.1 384.2 38.2 38.8

GE 200001 20.3 22.6 27.0 31.1 32.2 38.9 36.9 38.5 80.1 80.5 80.6 80.6 80.6 80..6 80.9OGE 180001 20.3 22.6 27.0 31.1 32Z- 38.9 36.9 18.S 80.1 80.5 80.6 40.6 80.6 81.8 40.9

GE 160001 20.3 22.b 27.0 31.1 32.2 38.9 36.9 38.5 4.1 80.3 810.6 810..6 80.8 80.6 40.9GE 180001 20'.3 22.6 27.0 31.1 32.2 38.9 36.9 38.5 80.1 810.5 40.6 40.6 800.8 80.8 80.9oGE 1200 0 20.3 22.6 27.0 31.1 32.2 381.9 36.9 38.5 8#0.1 80.5 80.6 80.6 80.8 '10.8 a 80.9

GE 100001 22.9 25.1 29.5 33.9 35.1 37.9 80.1 81.6 83.6 88.0 884.2 48.2 881.3 88.3 881.5OGE 90001 23.6 25.9 30.3 381.7 35.8 38.6 80.8 812.5 88.3 88.7 884.9 88.9 83.0 4S.0 85.2

GE 80001 27.3 30.0 35.1 39.5 810.8 83.6 846. 0 87.7 89 .9 511.3 S0.8 50.8 50.6 30.6 50.7GE Mal0 26608 31.3 36.8 80.8 12* 85.0l 87.8 89.1 51.3 51.7 51:8 51. 32.0 52.0 52.1oGE 60001 28.6 31.81 36.5 80. 82.2 85.2 47.6 893 51.81 51.6 52.0 S2.* S2.1 52. S2.3

GE $0001 33.8 36'.6 81.6 86.2 87.6 50.9 53.8 53.1 57.3 58.0 58.1 58. 58. 59. 58.0GE 85001 35.9 38.9 88.6 89.3 50.? 584.1 56.7 58.8 60.8 61.2 61.8 61. 61.5 61.3 61.6

GE 80001 840.5 83.5 50.L 55.i 56..3 60.8 62.9 681.6 67.0 67.5 67.6 67.8 67.9 67.9 68.2GE 35001 881.0 87.2 58.0 59.1 60 .'s 68.5 67.3 69.0 71.8 71.9 72.0 72.2 72.3 72.3 72.6GE 30001 86.6 819.9 56.6 62.2 63.8 67.9 70.9 72.6 75.3 76.0) ?6.1 76.3 76.8 76.8 76.8

GE 25001 87.2 50.8 57.5 62.9 648.3 68.6 71.6 73.3 76.0 76.7 76.8 77.0 77.1 77.1 77.6o E 20001 848.0 51.3 58.7 68.1 65.8 69.9 73.2 75.0 78.0 78.7 78.8 79.0 ?9.1 79.1 79.5GE 18001 48.4 51.8 59'.2 68.8 66.5 70.6 73.9 73.7 78.7 79.4 79.5 79.7? 79.8 79.8 80.3

GE 15001 50.1 S% .a 61 .8 66.9 686 72.9 76.3 78.1 81.1 81.8 82.0 82.1 82.2 82.2 62.7o G 12001 51.6 55.7 63.2 68.8 70.,b 78.9 78.1 80.7 83.7 68.8 84.5 884.7 881.6 88.8 8S.2

GE 10001 52.3 56.8 68.2 69.7 71.6 75.9 80.0a 82.1 85.2 65.9 56.1 86..2 86.8 66.80 86.8oGE 9001 52.3 56.8 68.9 70.6 72.6 77.1 81.3 83.81 86.5 87.2 87.8i a7.'5 87.6 87.6 86.1GE g0ol 53.0 57.5 65.9 71.6 73.6 76.1 6Z.8 88.8 07.9 68.6 88.8 88.9 89.1 89.1 89.5

G E 7001 5".1 58 06.2 72.9 75.0O 79.7 83.9 86.84 89.5 90.3 90.5 90.6 90.8 90.8 91.2o E 60aU 4 581 58.8 67.2 72.9 75.0 79.7 83.9 86.5 89.8 90.6 90.8 90.9 91.1 91.1 91.5

GE 5001 58.8 59.2 68.2 74.3 76.6 51.5 85.9 88.5 91.8 92.8 92.9 93..0 93.3 93.S 93.9oGE 8 o01 58.5 5 9.5 68.5 78.7 77..0 82.2 66.9 89.5 92.8 93.8 98.0 98.3 981.6 98.7 95.2GE 3001 58.5 59.5 68 .6 75.1 77. 7 83.0 87.6 90.2 93.8 98.7 95.0 95.6 96.0 96.8 97.7

GE 2001 !4.5 59.5 66.8 75.1 77.'T 83.0 87.8 90.6 98.2 95.2 95.5 96.2 96.9 97.3 98.9GE 1001 58.5 59.5 60.8 75.1 7M. 83.0 87.8 90.6 981.2 95.2 93.5 96.3 q7.2 97.6 100.0

GE al 54.5 59.5, 68.8 75.1 77.7 83.0 87.8 90.6 98.2 9S.2 95.3 96.3 97.2 97.6 100.0.............................................................. ............ ......... . o..............

TOTAL NUMBER Of 065CR VITIONSS 708

t~H

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR HEATHER SERVICE/MAC

STA71ON NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD Of RECORO: 76-8?MONTH: JUN HOURS(LSTP: 0600-0600

0............... ............ ....................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN 1 G E BE GE BE BE GE BE GE BE GE GE GE GE GE GEo FEET 1160 90 so 60 8 40 .32 214 20! 16 12 10 S S 9 0........... ................................................... ....... .......... p............................................

o NO CEIL m 19.5 21.0 23.6 26.2 27.0 29.0 290 30.1 30.1 30.3 30.9 30..S 3O.S 30.5 30.7

GE 200001 24.6 26.5 29.6 32.9 33.7 36.0 36.7 37.3 i 37.5 37.6 37.8 37.9 38.2 38.2 36.9o GE 160s0 29.6 z;S 29.7 33.1 33.9 36.1 36.8 37.5 37.6 37.8 37.9 38.0 38.3 38.3 36.6GE 160001 24.6 26.5 29.7 33.1 33.9 36.1 36:6 37.5 37.6 37.1 37.9 36.0 38.3 38.3 36.6BE 140001 29.6 26.6 29.9 33.2 31.0 36.3 36.9 37.6 37.6 37.9 38.0 38.2 3B.1 38. 36.7GE 120001 25.0 26.9 30.1 33.6 39.9A 36.8 375 36.2 38.3 36e. 38.6 380.7 39.0 39.0 39.2

GE 100001 29.0 30.9 39.9 38.0 38.6 41.2 02.0 42.6 93.0 93.1 93.2 93.9 93.6 93.6 43.9o GE 90001 29.7 31.6 35.2 36.8 39.6 92.2 93.0 93.8 913.9 9941.0 994.2 99.3 99.6 09.6 991.8GE 80001 39.6 36.9 L6 45.4 46.2 49.0 SO.2 510 51.3 5109 51.5 51.7 51.9 $1.9 52.2GE 70oa 36.0 38.2 93.0 46.9 97.7 GO.S 51.7 S2.5 52.7 52.9 53.0 53.1 53.4 53.9 53.7

O GE 60001 36.0 36.2 43.0 46.9 97.7 50.5 51.7 52.5 S2.7 52.9 53.0 S3.1 53.9 53.9 53.7

GE 50003 38.8 91.2 46.2 5.3 51.1 59.1 S.9 56.9 56.6 56.8 S6.9 S7.0 57.3 57.3 S7.7o GE 95001 90.8 93.9 98.6 52.7 S3.5 56.5 57.8 58.6 59.0 S9.2 59.3 59.9 S9.7 59.7 60.1GE 40001 46.2 490 S%;S 58.6 59.9 62.5 63.9 69.8 6S.'2 6s.5 65.6 6S.7 66.0 66.0 66.9BE 35001 49.8 S2.7 58.2 62.9 63.2 66.7 68.0 68.9 69.3 69.6 69.7 69.9 70.1 7o. 70.SGE 30001 53.3 56.S 62.2 66.S 67.3 71.0 72.3 73.6 74.2 79.9 791.6 79.7 75.0 75.0 7S.%

GE 25001 54.S S.7? 63.S 67.9 66.8 72.6 73.9 75.2 75.8 76.2 76.3 76.94 76.7 76.7 77.1O BE 20001 S.7 58.9 69.8 69.3 70;3 79.0 7S.9 76.8 77.6 78.0 78.2 78.3 78.6 7.6 79.0

GE 18001 56.0 S9.3 65.2 69.7 70.7 74. 75.8 77.2 78.0 76.9 70.6 78.7 79.0 79.0 79.9GE 1S001 57.7 61.0 67.2 72.0 73.2 77.0 78.6 80.1 00.9 81.3 01.9 81.5 61.8 81.8 82.2

oG 12001 80.1 63.5 70.0 79.8 76.0 79.8 1.S 63.1 13.9 68.3 89.S 69.6 69.9 6.9 85.3

GE 10001 609 64. 71.2 76.0 77.2 81.3 63.0 84.6 83.9 86.1 86.3 66.6 86.9 86.9 87.3oGE 900& 1.9 69.9 71.8 76.6 77.8 01.9 63.7 85.3 66.1 86.7 87.0 87.9 87.7 67.7 88.1GE 600 1 18 6S.5 72.6 77.9 78.6 82.7 89.6 86.3 87.1 87.6 86.1 88.5 88.1 88.6 09.2GE 7001 63.3 67.2 74. 79.3 0O.6 84.9 06.9 88.8 89.6 90.2 90.S 90.9 91.2 91.2 91.6

o GE 6001 83.1 67.3 79.7 79.5 80.9 85.3 a7.7 89.7 90.S 91.2 91.9 91.0 92.1 92.1 92.5

GE $001 63.5 67.3 7S.O 80.1 81.9 $6.2 88.9 91.3 92.4 93.0 93.3 93.7 99.0 99.0 99.9oGE 90001 63.6 67.6 75.4 6OS 82.1 87.0 90.S 93.2 94.'6 95.4 96.1 96.S 96.8 96.6 9T.2GE 3001 6306 67.6 75.9 0o.7 82tS 87.6 91.0 93.7 95.9 97.1 97.7 98.1 98.4 94.9 98.8GE 2001 63.6 67.6 75.4 00.7 62.5 87.6 91.0 93.7 95.9 97.1 97.7 98.3 98.9 98.9 99.7GE 1001 63.6 67.6 7S.9 80O7 82.5 87.6 91.0 93.7 959 97.1 97.7 98.3 99.1 99.1 100.0

GE 01 83.6 67.6 75.% 80.7 82.5 87.6 91.0 93.7 95.9 97.1 97.7 98.3 99.1 99.1 100.0.. . ..............................

TOTAL NUMBER OF OSEVATI0NSI 797

±:L--

V.I

F-, -- --- F-

-i

GLOBAL CLIAIOLOGY BRANCH PERCENTAGE FREQUENCY Of OCCURRENCE OF CEILING VERSUS VISIBILITYusAFETAC FROM HOURLY OBSERVA1IONSAIR wE 1,INER SERVICIMAHC

STATION Mm2ERs 035623 STATION NAREs RAF ALCO1IBURY UNITED KINGOM: PERIOD OF RECORD% 76-87

.. • . .. . ONTHt: JUNI HOURtSILSlr)$ 0901-1100

...... . p . .. .. ... . .... ....... ............ ... .... ... .... .. .. .CIEILINS VISIBILITY IN HUNDREDS OF METERS

IN 161 GE GE GE GE GE GE BE GE GE GE B BE GE BE BE0 FEET I 160 90 so 60 48 10 32 24 20 16 LZ to a 5 a

0 NO CEIL i 21.1 22.5 2.0 24.6 29.6 29.6 29.6 21.6 29.5 29.6 29.6 21.6 2 . .6 2.4

GE 200001 29.1 30.7 32. 33.2 33.2 33.2 33.2 33.2 33.2 33.2 33.2 33.2 33.2 33.2 33.20 GE 1 a0001 29.1 30.9 32;7 33,S 33.5 33.S 33.5 33.S 33.5 33.s 33.S 33.S 33.s 33.5 33.S

SE 160001 29'.4 30.9 32.7 33.3 33.5 33.3 33.3 33.S 33.5 33.3 33.$ 33.5 33.5 33.S 33.5SE 190001 29.' 30.9 32.7 33.5 33.5 33.S 33.S 33.S3 33.3 33.3 33.5 33.3 33.s 33.5 33.s

0 GE 120001 29.. 31.2 33.3 39.1 3.11 34.1 3401 3'1.1 34.1 39.1 39.1 34.1 3%.1 311.1 3..1

SE 100001 33.0 34.3 36.6 37.9 37.'. 37. 37.4 37.' 37.9 37.' 371. 37. 37.' 37. 37.o SE 90001 33.3 39.9 37.0 37.8 371. 37.8 37. 37.8 37.5 37.8 37.6 37.5 37.5 37.5 37.0

BE 50001 37. 36.9 '1.1 '1.9 '1."9 '1.9 '2.0 %2.0 42.0 42.0 '.2.0 .2.0 .2.0 42.0 42.0GE 70001 3a.7 '.0.2 '.2.. 3.1 43.1 '3.1 '3.3 '3.3 43.3 '3.3 13.3 93.3 '3.3 '53.3 '3.3at 60001 35.5 40.3 .2.5 '13.3 '3.3 '3.3 '3.. 13.' 13.' '3.. 93.'. 13.% '3.'. 9 3.'. '3.'

E sociOI 40.5 '2.1 '..S 'S.S 'SoS 'S.8 .1. '6.1 '6..1 '4.1 '.. '.1 '6.1 '16.1 '6.1

0 a SM '3.0 '.5. '.949 50.' 50.' 50. 509.9 309 3e 39 3o.9 30.9 30.9 51.9 S0.9SE 40001 14. 56.4 39.2 60.2 60;2 60.6 61.1 61.1 61.2 61.2 61.2 51.2 61.2 61.2 61.2SE 3SO01 40.2 62.2 .1 64.3 66;S 66.7 67.2 67.2 67.3 47.3 67.3 67.3 67.3 67.3 67.3

0E 30001 .3 70.5 79.02 75.4 7S6 76.1 76.6 76.6 76.7 74. 76.7 76.7 76.7 76.7 7?.

GE 25001 11.2 73.S T.s 7409 71.9 79.' 79.9 19.9 50.0 60.0 . 0.0 sco 900.0 10.0 50.00 SE 2001 I5.$ To.& 2.3 13.7 83.7 8'.2 5'.7 '.7 s.9 $4,9 5.9 4.,9 0. S.9 8.9

SE sool 76.2 1*5 52.7 19.1 1 o 1 .6 55.1 5S.1 5S.2 45.2 53.2 5S.2 lS.2 5S.2 15.2BE 1S0t 19:3 51.7 4:.3 5?9 57.9 55. 55.9 55.9 59.1 59.1 89.1 69.1 09.1 89.1 59.1

0 SE 12001 500 53.7 1so. 90.3 90.3 90.5 91.3 91.3 91.5 91.5 9.S 91.5, '1.3 91.S 91.S

N 1000S 2.5 55. 90.3 92.5 92.5 93.0 93.S 93S 93.9 93.9 93.9 93.9 93.9 93.9 93.9o SE 9001 53.3 5.0 9~im 93.0 93.1 93.4 94.1 94.1 9'.. 90.5 99 9..5 99.5 94.S 9#6.SaE g001 13.5 16.1 91* 9.1 99.3 94. S 93 . 93.? 93.7 9S.7 9S7 9S.7 S.? 95.7SE 7001 5'.' 17;S 92.7 9S.6 91.1 96.7 97.3 97.3 97.7 9177 97.1 97.7 97.7 97.7 97.1

o at 6001 99.5 57.0 93.0 96.2 96.6 97.3 95.1 91.2 95.6 95.6 95.6 90.6 95.6 95.6 95.6

E 301 59.9 55.2 93.'. 96.6 97.1 97. 95.9 99.9 99.7 99.7 99.7 99.7 99.7 99.7 99.7G E so00 5.9 sea '3.'. 06.6 91.1 97.5 99.in 99.6 100o016. 100.0 00.0 00. 100.0 300 19.0SE li00 09.9 8.2 93o. 96.6 97.4 97.5 99.0 99.6 100.0 100.0 100.0 100.0 100.0 100.0 10000BE 2001 4.9 I1.2 93.'. 96.6 91.1 9?.s 99.0 99.6 100.0 100.0 100.0 100.0 100.0 100.0 100.0o to 1051 599 68.2 93.' 96.6 97.1 97. 99.0 99.5 100.0 10000 100.0 100.0 100.0 100.0 100.0

41 0 19.9 85.2 93.'. 9.6 97.1 97.5 99.0 99.6 100* 10000 100.0 100.0 10000 100.0 100.0...................................................... 0., . .0 .................. 0. 9.f...............0........

ISTAL musSEA Of 0650SVACKI 766

!-4.. Kll41I 111I1101l I

--4 J Rui

6 LO9AL CLINIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURENCE OF CEILING VERSUS VISIBILITYLISATEI AC FROM HOURLY OBSERVAIIONSAIR WEATHER SIRVICEtIC

STATION NUMER: 03S623 STAION MAKE: RAF LCOBUY UNITED KINGDOM PEDIO0 OF RECOROt 787MfONTMZ JUN "OURSKSS7|t 12OC-S16CO

CEIINGVISIXLITv IN H~U';R[DS OF ;HII*S100 ST6 GE B[ E 6 B 6E GE GE GE BE BE BE BE G1 61 6E

FE ET |16 0 9 0 so 60 48 400 32 240 20 16 12 10 a S It 0

.1O C(IL J 22.3 22.9 23.4 23.40 23.8# 23.4 1 23.06 23.4 23. 2 23.9 23.% 23.% 23.1 23o1

GE 200001 30.5 31.6 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1 32.1o GE 180001 11.2 32.0 32.5 32.S 32.S 32.5 32.S 32.5 32.S 32.S 32.S 32.S Yz.S 32.S 320S

GE 160001 11.2 32.0 32.s 32.S 32.53 32.5 32.S 32.S 32.S 32.5 32.S 32.5 32.5 32.S 32.SGE 190001 31.2 32.0 32.1 32.S 32.S 32.S 32.S 32.S 32.S 32.S 32.S 32.S 32.5 32.S 32.5

O GE 120001 31.7 32.S 3300 33.0 33.0 33.0 33.0 33.0 33.0 33.0 33.0 33.0 33.0 33.0 33.0

GE 100001 35.2 31.9 36.7 36.7 36.7 36.7 36.7 36.7 36.7 3607 3b.7 36.7 36.7 36.7 36.7GE 90005 3.6 36.3 37.2 37.2 37.2 37.2 37.12 37.2 37"2 37.2 37.2 37.2 31.2 37.2 37.2GE 50005 90.5 41.3 92.9 92.9 92.4 42.4 92. 912. . 92.t 92.4 92.91 f 92. Is 92.9 92.9 92.9GE 70001 92.s 43.3 4%.2 9.2 1.2 9.2 99.2 994.2 '9.2 99.2 99.2 99.2 99.2 11.2 99.2E GE 60001 92.6 43. 99.9 99.9 99.49 99.9 99.9 99.9 41 % 44.9 4.9 1919.6 944.4 914.4 99.4

GE SOO 4. 7.3 94.1 95.1 95.1 6.1 %5.1 49.1 95.1 96.1 95.1 96.1 98.1 98.1 956.1G .9so0 53.6 S.s SS.S SS.S SS.S SS. S.S SS.S SS. S5.5 SS.S SS.S SS.S S.S 13.3GE 90005 6S.3 66.2 67.3 6703 67.3 670. 67.S 67.5 67S 67.3 6?.S 67.S 67.S 67.5 b7.5GEi

3SO 73.4 79.8 76.0 76.1 761 764 7649 764 76*. 76.9 ?6.4 76o 764 764 764G 30001 63.2 B4.3 6.2 564 6. 46.7 56.? 54.? 64.? 64.? 64.7 4.67 86.7 56.7 64.7

E 2SO01 IS.% $6.4 654. 5.0 ses B9.1 59.1 59.1 89.1 59.1 89.1 59.1 69.1 59.1 $9.1SE 20001 00.2 69.9 91.S 91.9 91.9 92.2 92.2 92.2 92.2 92.2 92.2 92.2 92.2 92.2 92.2

GE 15005 8.3 59.6 910 92.0 92.0 92.3 92.3 92.3 92.3 92.3 92.3 92.3 92.3 92.3 92.3GE Isoo1 90.5 91.5 99.11 94.3 99.6 95.0 9S.1 93.1 93.1 95.1 91.1 95.1 9S.1 95.1 91.1B GE 12001 91. 92.6 93.1 9S. 96.0 96.3 964 96. 964 96.9 96.1 96.4 964 96.9 964

GE 1000 92.7 96.0 96. 97.1 97 ,9 9706 97.5 97.5 97.5 9?0 97.8 97.5 97.5 97.8 97.8G 9001 92.7 99.0 94.S 97.1 97.9 9?.6 97.5 97.5 97. 97.6 97.5 97.5 97.5 97.5 97.5GE s05 92.5 94.2 96 9?S 97.8 98.1 95.3 96.3 95,9 906. 95.9 95.9 98. 9501. 95.9GE 7005 93.2 99.9 97.6 95.8 99.0 99.9 99.s 99.5 99.6 99.6 99.6 99.6 99.6 99.6 99.6GE SE 6001 93.2 99.9 97.6 9.8 99.0 99.9 99.3 99.6 99.8 99.5 99.6 99.6 99.6 99.B 99.0

GE SOO 93.2 99.9 97.6 98.9 99.,3 99.6 99.5 99.9 100.0 100.0 100.0 10000 100.0 103.0 100.0GE 9005 93.2 99.9 97.6 96.9 99.3 99.6 99.6 99.9 100.0 100.0 100.0 300.0 100.0 100.0 100.01E 3005 93.2 99.9 97.6 98.9 99.3 99.6 99.6 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0

GE 2001 93.2 99.9 97.6 96.9 99.3 99.6 99.5 99.9 t00.0 I013.1 100.0 100.0 100.0 100.0 100.0GE 1001 93.2 99.9 97.6 95.9 99.3 99.6 99.5 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0

G a 0l 93.2 94.9 97., 95.9 99.3 99.6 99.5 99.9 100.0 30..0 100.0 100.0 100.0 100.0 100.0

S......................................... ..

TOTAL. NUMBER Of *S1EVAIIOSt 609

GLOBAL CLIMATOLOGY. BRANC14 PERCENTAGE FREQUENCY Of OCCURRENCE OF CEILING VERSUS VISIBILITYUs ATE T A C FROM HOURLY OBSERVATIONSAIR WEATH.ER SERWICEIMAC

STATION NUMBERs 035623 STATION NAMES RAF ALCONSURY UNITED KINGDOM PERIOD Of RECORD: ?B-87MONTH: JUN HOURS4LS~ISOO53-1700

CEILING VISIBILITY IN HUNDREDS Or METERSIN BY1 61 GE GE GE GE GE GE GE GE GE GE ac GE GE GEoFEE? I 1 60 9 0 so 60 '.8 '0 32 2'. 20 36 12 10 S 5 '. 0

.. . . .. .. . . .... ... . . .... .... . . .. .. . . . . . . . .. . . .. ... . . .. .. . .

ONO CL I 22.0 22.0 22.'. 22.11 22.'. 22.'. 22.'. 22.'. 22.'. 22.'. 22.'. 22.41 22.'. 2Z.4 22.'.

GE 200001 30.2 30.2 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 30.6 33.6 30.6oSE100I 3. 30.:5 30.9 3o.:9 30.9 30.9 30. 30.9 30.-9 30.9 30.9 30.9 30.9 30.9 30.9GEc 16000001 30.5 30., 30. 30.9 30:9 30.9 3 0:: 30. 30.9 30.9 30.9 30.9 3D.9. 33.9 30.9Gc 14000O1 30.5 30.5 30.9 30.9 30.9 30.9 30.9 30.9 30.9 3n.9 30.9 30.9 30.9 3'I.9 30.9& E 120001I 32.0 32.0 32.'. 32.. 32.'. 32.41 32.'. 32.4. 32.'. 32.4 32.4 32.'. 32.'. 32.'. 32.'.

GE 180001 !6.1 36.1 36.5 36.5 36.-s 36.5 36.*5 36.5 36.S 36.5 36.5 36.S 36.1 36.S 36.5C) E 90001 36.5 36.S 31. S.0 37;0 31 3.0 3.0 37.0 3.0 31.0 37.0 37. 37. 0 io s. 31.0

GE Ma00 '.2.6 '.2.9 4.3.3 '.3.3 '.3.'3 '3.3 '.3.3 4.3 .3 '.3.3 '.3.3 4.3.3 '.3.'3 '.3.3 '13.3 '.33GE 10001 '.9.3 9'.'. '..9 49'' '..9 49.9 '.9.9 49'.' 99.9 '.9 '..9 11t..9 '.'..9 '.94.9 '1.99o E60001 4.5.1 4.5.2 45.7 9sl 5.7 9 5.7 4.57 .7 95.7 4.S. '5.7 11 5.7 '4.j '.. '.. it.?

GE m000 53.3 51.6 S2.1 52.1 52.1 52.1 12.1 S2.1 52.1 52.1 S2.1 S2.1 52.1 52.1 52.1B E '.001 55.'. 56.9 59.'. 59.. 59.'. 59.. 9.'. 59.'. 59.'. S9.'. 59.'. 59.0 59.'. 9.4. 59.'GE '.0001 69.7 70.3 Ti.'. 71.. 71.;. 71 .'. 1. 71. 9 71 1.'. 73.4 73.'. 71.8 71' 71.9 7 .4 1.'.GE 35005 1.2 76.0 79.3 79.3 79.3 79.3 79.j 79.3 79.3 79.3 79.3 79.3 19.3 79.3 19.3oGE M000 85.3 66.3 $8.1 60.1 86.1 6.2 68.2 68.2 66.2 66.2 68.2 6414 66.2 R.? 68.2

GE 25005 67.7 69.0 9.1.0 '.1.2 91.2 91.3 9 1.3 91.3 91.3 91.3 9~ 91.3 91.3 91.3 93* 1.3oGE 20001 69.'. 91.0 '.3.1 93.3 93.3 93.! 93.5 93.5 93.5 93.5 93.5 93.5 93.5 93.S 93.1GE 18001 69.9 91.0 93.1 93.3 93.3 93.5 93.5 93.5 93.5 93.5 93.5 93.1 93.S 93.5 93.1

GE1500 69:9 91. 93.9 99.1 99.1 949.2 9'..2 9'..? 9'..'. 9'.' 9'.' 9'.' 9'.' 9.'. 9'.'.o E 12001 91.3 93.1 95.6 96.2 96.2 96.. 96.7 96.1 96.6 96.6 96.6 96.9 06.4 96.6 96.6

GE 10001 92.1 93.9 96.7 97.2 91.2 97.. 9'.? 97.? 97.6 91's 95.0 96.0 96.0 96.0 96.0oGE 9001 92.1 93.9 96 .9 97.'. 97w.# 97.7 90.0 95.0 '96.1 99.1 96.2 96.2 98.2 94.2 96.2GE £001 92.1 93.9 96.9 97.'. 97.'. 97.6 99.1 96.1 96.2 986.2 96.3 96.3 '.6.3 98.3 96.3BE 701 92.7 991.9 96.0 96.6 99.0 99.'. 99.6 99.6 99.7 99.7 99.:9 99.9 V.9.9 99.9 99.

GE 5001 92. 99t4.9 90 9. 99. 995 99.7 9.7 99. 99.o9 10. £00.0 10.0 100.0 10 0o E 9005 92.7 99.9 "6.a 99.0 99.1 99.! 99.7 99.7 9'..9 99.9 100.0 100.0 100.0 £00.0 100.0

GE 3001 92.7 99.9 96.0 99.0 99.1 99.5 99.? 99.? 99.9 99.9 100.0 100.0 100.0 £00.0 100.0GE 2001 92.7 94.t 96.0 99.0 99.1 99.5 99.7 99.1 99.9 99.9 100.0 100.0 300.0 100.0 100.0B E 2001 92.7 99.9 96.0 9.9.0 99.1 99.5 '.9.7 99.1 99.9 99P.9 100.0 300.0 £00.0 100.0 100.0

GE 101 92.7 99.9 If6.0 99.0 99.1 99.5 to.? 99.7*, 99.9 99.9 100.0 £v. 00.0 100.0 1'. 00.0

TOTAL NOER ofOI 66OU9TIONSS Te1

GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

USAE TA C FROM H4OURLY OBSERVATIONSAIR WEATHElR SERVICIPAC

SraTAON M6NUzK~ 035623 STaTION NANE RAF ALCOBIURY U41TED KINGDOM PERIOD OF RECORD: 78-8?MONTHt JUN HOURSILSTI: 1800-200

CEILING VISISILITY IN HUNDREDS OF METERSIN I 1 BE 0E GE GE GE GE GE 6E GE GE GE GE GE GE GE

FEET J 160 90 s0 90 96 90 32 29 20 16 12 10 8 S 9 0

NO CElL I 26.1 269. 27.1 27.5 2105 27.S 27.S 27.S 27.5 27.S 27. 27.S 27.S 27.S 27.

6E 200001 32.9 33.1 3.0 34.6 31. 6 39.8 39.8 39.6 39.8 34.s 39.8 39.8 39.6 39.8 39.8o :E 160001 33.6 39.2 31.1 3SS 31.1 3SS 31.1 31.1 31.5 31.1 31. 31.S 35.1 35.S 31.

GE 16000 33.6 39.2 31.1 31.1 35.5 35. 3S. 31.5 31.5 31S. 3SS 31.1 31.5 SSS S1SGE 190001 33.8 39.3 31.7 3S.7 3S? 31.7 3S.7 3S.7 35.7 31.7 35.7 357 3.7 35.7 35.7o GE 120001 39.3 39.9 36.2 36.2 36.2 36.2 36.2 39.2 36.2 36.2 36.2 36.2 36.2 36.2 36.2

6E 100001 37.9 38.0 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39. 39.9 39.9 39.9G 9000 .18.3 38.6 90.3 90.3 i.0.3 90.3 90.3 90.3 40'3 40.3 90.3 90.3 90.3 90.3 90.3GE 0001 4S.1 91.7 97.9 97.9 47.9 7. 97.9 . 7.9 97.9 97.9 97.9 47. 97.9 97.9 7.9SE 70001 97.9 98.1 S0.0 50.1 S0.1 10.1 10.1 S0.1 50.1 10.1 0o.1 50.1 10.1 10.1 10.1at 60O000 97.a 96.6 so.9 10.9 S0.6 50.6 S0.6 50.6 50.9 50.9 10.9 10.9 10.9 10.9 6

GE 50001 19.s S1.2 S7.9 17.7 17.7 St7 17.7 17. 57 ST: 17. S 576 17.8o GE" 950. 9 0.7 93.0 93.3 3S.1 35 .963S .3 6 3 9 63 .9 63. 63.63 63 . 93.9

GE 90001 70.9 71.9 79.9 7S.2 71.9 7S. ?S. 7S.S 7S. ?S.s ?S. TS.S 71S. 71.S 7S.or 300 79.s 78.1 61.7 82.0 82.2 82.2 82.2 82.3 82.3 62.3 82.3 82.3 62.3 62.3 62.3o GE 30001 82.8 69.6 04. 69.0 89.1 89.1 69.1 $9.3 89.3 69.3 89.3 89.3 89.3 89.3 89.3

or 2S001 63.3 85.S 49.7 90.6 90.7 90.7 90.7 90.9 10.9 90.9 9 .i 90.9 90.9 90.9 90.9o GE 20001 69.3 69.S 91.0 91.9 92.0 92.3 92.3 92.1 9Z.S 92.5 92.5 92.1 92.5 92.5 92.1GE 19001 69.9 6.8 91.3 92.3 92;S 92.S 92.8 92.9 92.9 92.9 92.9 92.9 92.9 92.9 92.9E Isoo I1.9 67.41 92.S 93.9 94.2 99.6 99.6 99.8 99.6 99.0 99.8 99.6 99.6 99.6 99.8

C, SE 12001 s.8 88.9 93.2 99. 95.1 9S1 95.1 95.8 91.6 9S.0 9S.6 91.8 91.6 95.6 95.6

GE 10001 96.2 89.3 99.2 99.1 96.,f 97.0 97.0 97.1 97.1 97.1 97.1 97.1 97.1 97.1 97.1C Gt 9001 67.0 90.0 99.9 99.6 97.1 97.7 91.1 97.6 97.8 97.8 97.8 97.8 97.8 97.8 97.6

GE 8001 67.0 90.0 91.1 97.2 91#S 96.1 98.1 98.3 96.3 90.3 98.3 98.3 98.3 99.3 96.3St 7001 97.2 90. 9.9 98.7 99.0 99.7 99.7 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.9o BE 6001 87.2 90.6 95.9 940 99.0 99.7 99.7 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.9

GE 1009 87.2 90.9 91.9 98.6 99.1 99.9 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0Or E 9001 67.2 90.6 91.9 98.6 99.1 99.9 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0

SE 3001 7.2 90.A 91.9 96.8 99.1 99.9 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0GE 2001 #7.2 90.6 98.9 90.8 99.1 99.9 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0SE 1001 0*2 90.6 9.9 96.8 99.1 99.9 99.9 100.0 100.0 10N 100.0o0o0o 100.0 100.0 100.0 100.0

oE o 67.2 90.8 96.9 9o. 99.1 99.9 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0

TOTAL NUNER OF OIgtSVaTIONS8 890

,m in a mm Hi illi lHI~la m ,H

GLOBAL CLINATOLOG BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR HEATHR SERVICEIMAC

STATION NUMBER: 035623 STATION NAME& RAF ALCONBURY UNITED KINGDO PERIOD Of RECORD: 7-67MONTH: jiU HOURS(LSTI: 2103-2300

CEILING VISIBILITY IN HUNDREDS OF METERSIN I 5 GE BE GE GE GE GE GE GE GE GE GE GE GE GE GE

0 FEE T 16o 90 s0 60 8 Ka O 32 29 20 16 12 10 a 5 5 0.............................................................................

NO CEIL 1 32.1 32.9 3S3S 36.5 3bS 37.0 37,;2 37.2 37.2 37.K 37.% 37.9 37.% 37.4 3714

GE 200001 37. 36.6 91.3 92.7 92.7 93.3 93.7 93.7 93.7 13.9 43.9 93.9 53.9 43.9 43.9GE 160005 37.4 38.6 91.3 4207 92.7 93.3 93.7 43. 93.7 93.9 13.9 93.9 93.9 43.9 93.9GE 160001 37.9 36.6 4103 92.7 42.7 43.3 9307 93.7 43.7 93.9 #3.9 93.9 93.9 93.9 43.9GE 190001 36.2 39.4 92.2 4S.S 43.S 94 .2 414.S qq.s 99.0 557 . e7. 5 6.7 .7 4K.7 41 %.7

0 GE 120001 36.2 39.9 412.2 53.5 43.S 44.2 99.5 49.S 95S 99.7 99.7 99.7 99.7 4.7 44.7

GE 100009 q0.K 91.6 947 56:I 1 6.1 96.9 97:3 9713 97:3 7:: 97.4 97.9 97.9 97.9 T: .9o GE 90005 91.6 K2.8 95.9 97.3 K703 KB01 96.1 96.S aB.S Is6 96.6 96.6 a6.6 98.6 966GE 80005 46.6 47.6 S1.9 1 2.7 S27 S3.6 53.9 S3.9 S3.9 59.1 54.1 S9.1 S4.1 54.1 54.1at 70009 96.1 99.3 S2.9 19.6 5.6 SS.S 5S5. 51.8 SS.6 16.0 56.0 56.0 56.0 56.0 56.0o GE 60001 9G.5 99.7 S3.6 55.3 So.3 S6 1 56.5 56.s S6.S S6.7 5607 56.7 56.7 56.7 56.7

G S500 53.2 Sib.9 S6.S 60.2 60.2 61.1 61.9 61.9 61.4 61.6 61.6 61.6 61.6 61.6 61.60 9SO09 57.0 58.9 62.6 69.7 69.7 6.5S 65.9 66.0 66.0 66.2 66.2 66.2 66.2 66.2 66.2GE 9001 69.3 66.0 71.0 73.2 73.2 79.1 79.9 79.6 75.6 79.7 7K.7 79.7 79.? 79.7 79.7Ge 3SOO 66.6 70.S Is.$ 76.2 78.2 79.2 79.5 79.7 79.7 79.9 79.9 79.9 79.9 79.9 79.9GE 30001 73.5 7S.6 61.6 9.1 6%53 65.5 65.6 66.0 86.0 66.2 66.2 66.2 66.2 86.2 06.2

GE 250 79.6 76.6 62.9 S.s S.7 66.9 67.2 67.9 67.9 67.5 07.1 07.5 67.S 47.5 67.1GE 20001 7So% T7.5 9.1 $6.9 67;0 66.2 866 66.7 8.7 66.9 869 88.9 66.9 88.9 8109GE 16001 75.9 77.5 6.1 66.9 7.-0 66.2 66.6 6o.7 66.7 8.9 6.9 66.9 66.9 69.9 86.9GE 1005 77.5 60.0 66.9 69.8 9Q.1 91.S 92.0 92.2 92.2 92.3 92.3 92.3 92.3 92.3 92.3

0 GE 12001 79.9 62.1 69.2 92.3 92.7 99.0 99.5 99.7 99.7 99.9 99.9 99.9 95.9 95.9 99.9

:0, 800 62.9 90.9 93.7 ::0 911 91.9 96.1 96.1 96.2 96.2 96.2 2 92 96.2 96.2o G 9005 60.2 63.1 90.6 9.9 991 56 96.1 96.2 96.2 96.9 96.9 96.9 96.9 96.9 96.9SE 600 80:7 3.6 91.1 99.9 99.7 96.1 96:6 96.6 96.6 96.9 96.9 96.9 96.9 96.9 96.9GE To001 67 63.6 92.0 9S.6 91.9 7. 9a.0 96.1 96.1 99.3 98.3 96.3 98.3 98.3 96.

SG o 600g 0.7 83.6 92.0 95.6 95.9 97.4 96.0 96.1 90.1 96.3 96.3 9.33

at Scol 01.1 69.3 92.7 96.6 97.3 98. 99.3 990. 99.5 99.7 99.7 99.7 99.7 99.7 99.7GE 90O1 61,1 :::3 92.6 96.9 97.9 99.0 99.S 99.7 99.7 99.6 99.6 99.6 99.6 99.6 99.6SE 3601 61.1 69.3 93.0 97.1 97.6 99.1 99.7 99.6 99.6 100.0 100.0 100.0 100.0 100.0 100.0SE 2001 1.1 &%.1 93.0 97.1 97.6 99.1 99.7 99.6 99.6 100.0 100.0 100.0 100.0 100.0 100.0

CI 61 100i 1.1 69.3 93.0 97.1 9.-6 99.1 99.7 99.6 99.6 100.0 100.0 100.0 100.0 100.0 100.0

G( 05 61.1 69.3 93.3 97.1 97.6 99.1 99.7 99.0 90. 100.0 100.0 100.0 100.0 100.0 100.0c; ~ ~ ~ !........... ......................... ........ .......................

IOTAL 06001 OF OS5ERVATO4ia 986

iL..

--t

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETA C FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC0STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED NNGDOM PERIOD OF RECORDs 78-87

MONTHS' JUN 110IRSILST): ALL.............................................................................................. ................ ......................CEILING VISIBILITY IN HUNDREDS OF METERS

IN IG1 GE GE 6E GE 6 GE GE GE GE GE GE GE GE GE GEFEET | 160 90 s0 60 a,8 %0a 32 21 20 16 12 10 8 5 1o 0

S. ....... ...... ...................... ............... ............................... ..........................

NO CEIL I 23.1 24.1 26.1 27-5 27.B 28.5 28. 29.0 29.2 29.3 29.3 29. 29. 29.11 29.S

GE 200001 29.6 30.9 33.1 3.11. 31?.? 35.S 36.0 36.3 36.5 36.6 36.6 36.7 36.6 36:8 36:8o GE 160001 29.a 31.1 33.3 311.7 31.9 35.7 36.2 36.5 36.7 36 36.9 36.9 37.0 37.0 37.1GE 160001 29.B 31.1 33.3 39.7 31,9 35.7 36:2 36.5 36.7 36:8 36.9 36.9 37:0 37.0 37.1GE 1110001 30.0 31.2 33.5 39.8 35.1 3S.9 36.9 36.6 36.9 37.a 37.0 37.1 37.2 37.2 37.2G 1229501 30.1 31.7 31.0 3S.3 35.6 36. 36.9 37.2 37.1 37.5 37.6 37."6 37.7 37.7 37.

GE IN0GO 33.6 34.B 37.3 38.7 39.0 39.8 90.3 10.7 110.9 11.0 11.1 11.1 11.2 11.2 111.3c GE 90001 31.2 35.5 3.D 39.11 397 110.6 111.1 11.1 411.? 4111B 111.B 91.9 112.0 12.0 112.8

GE 0001 39.2 110.6 13.11s 1111.9 1S2 16.1 %6.7 7. 117.3 117.11 7. 17.1 417.6 97.6 47.7GE 7000 10:7 92.1 1S*0 6.5 16.8 1?.7 1B.11 18.7 19.0 119.1 119.2 49.2 19.3 119.3 19.1

0 GE 60001 110 12.1 1e5.3 46.8 97.2 18.1 18.7 19.0 19.11 119.11 119.5 19.6 99.6 119.6 119.7

G S 5000| 11e3 116.6 499 1IS S1.6 S2.8 13.1 13.9 S.2 19.3 S.1 511.1 511.S 515 S116GE 41S1: 119.? 119 511 .l1 16.1 16.7 57B $B.S 51.9 59.2 19.3 59.11 9.11 59.5 59.5 5o6GE 10001 18.3 60.1 64.0 6.7 66. 0 6. 8 68.1 8.? 6?.9 669 69.2 69.1 69.1 69.2GE 350o 63.7 65.7 69.7 71.S 71.9 73.2 711.0 ?.3 711.? 79.8 7.9 7.0 7511 75.1 71.2G 30001 69.8 72.0 76.11 7.1 76e4 50.2 81.0 61.1 $1.9 87.0 B2.1 $2.2 92.3 82.3 82.1

GE 2500? 71.3 T3.S 78.2 8003 80.7 62.1 82.9 63.11 B3.8 0.0 B10.1 B1.1 81.2 B1.2 81.3GE 20001 73.2 7Se6 50.11 $2.5 63.0 611. BS.3 65. 6.3 6.5 96.S 86.6 16.7 56.7 b6.86E 15001 73.1 71.5 S0.7 82. $3,2 51.7 8.6 56.0 66.6 96.7 66.8 &Go$ 46.9 87.0 67.1GE ISO01 752 77.7 2.8 65.1 65.6 57.2 66.1 86 89.1 89.3 69. 890 89.5 59.5 59.7GE 12001 76.6 79 81.6 7.1 07.6 69.2 90.3 90.8 91.3 91.5 91.1 91.6 91.7 91.7 91.5

GE 10001 77.6 BO. 66.0 86.1 89.1 90.7 91.5 92.3 92.9 93.1 93.2 93.3 93.1 93. 93.S

o GE 9001 77.9 50.5 56.1 49.0 89.6 91.3 92. 92.9 93.1 93.7 93.8 93.9 911.0 99.0 911.2GE 8001 76.3 51.2 46.9 89.6 90.2 92.0 93.1 93.7 910.3 91.1 911.6 91.7 9411. 911 911.9GE 7001 78.9 82.1 S6.1 91.1 91.6 93.6 9110 95.1 96.0 96.2 96.3 96.9 96.1 96.1 96.6GE 6o0 79.0 12.2 66.2 91.2 91.9 93.5 9S.1 91.7 96.3 96.6 96.7 96.6" 96.6 96.9 97.0

GE 500 79.2 62.5 u5.s 91.8 92.6 941.6 95.9 96.7 97.1 97.6 97.7 97.8 97.9 98.0 98.1o GE 0001 79.2 62.6 65 92.1 92.9 911.9 96. 97.3 95.0 98.2 98. 985. 90.6 99.7 9.a

G 3001 79.3 52.6 $6.9 92.3 93.2 9S.2 96.7 97.1 9.11 95.7 96.9 99.0 99.1 99.2 99.GE 2001 19.3 52.6 56.9 92.3 93.2 95.2 96.6 97.6 961 980.8 99.0 99.2 99.1 99.5 99.6

O GE 1Q01 79.3 62.6 40.9 92.3 93;2 95.2 96.5 97.6 995. 95.5 99.0 99.2 99.1 99.5 100.0

6[ o! 79.3 02.6 88.9 92.3 93:2 95.3 96.8 97.7 945. 981. 99.0 99.Z 99.1 99. 100.0

TOTAL MUNDIN OF OSCERVATIONS1 SS50

L.H

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/HAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 76-B?MONTH: JUL HOURSILSTI: 0000-0200

C....................................... ...................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I G7 GE GE GE GE GE BE GE GE GE GE GE GE GE GE GE) FEET I 1b0 90 80 60 88 40 32 28 20 16 12 10 8 5 4 0... p ......... ****.....................................I.......................

o NO CEIL 1 41.9 44.5 8.0 49.9 50.3 51.0 S.7 51.7 52.0 S.O 52.2 52.2 S2.3 52.3 S3.0

GE 200001 45.4 %8.3 S2.3 S14.6 55.1 55.0 56.5 56.5 57.0 51.0 57.2 57. 57.6 57.6 58.3GE 180001 85.4 88.3 52.3 54.6 S.1 $5. sb.5 56.5 570 57.0 57.2 57.% 57.6 57.6 58.3GE 160001 5. 48.3 52.3 5%.6 5501 SS. 565 S6.S 57;0 57.0 57.2 57. 57.6 57.6 58.3GE 180oo 4S.4 88.3 52.3 S1.6 55.1 53.8 56.5 56.5 S;0 57.0 57.2 57.8 37.6 57.6 S8.3

c BE 120001 45.4 48.3 52.3 54.6 55.1 S5. S6.s 56.5 57.0 57.0 57.2 57.8 57.6 57.6 58.3

GE 100001 87.0 49.9 53.9 56.2 56.7 57.4 58.3 58.3 58.8 S8.8 S9.0 59.1 59.3 59.3 60.0o GE 90001 47.7 0o.6 S4.8 ST.0 57.'6 S8.3 59.3 S9.3 59.8 59.8 60.0 60.2 60.3 60.3 61.0GE 80001 s1.S 548.48 5. 61.0 61.6 62.3 6303 63.3 63.8 63.8 64.0 64.2 614.3 64.3 65.0GE 70001 51.8 54.8 59.1 61.4 61.9 62.6 63.8 63.8 68.3 64.3 64.5 64.7 64.9 68.9 65.6o GE 60001 52.0 SS.0 9.5 61.7 62.3 63.0 64.2 681.2 64.7 64.7 64.9 65.0 65.2 65.2 65.9

GE SOnO S 53 S9.1 63.8 66.3 67.0 67.8 69.0 69.0 69.6 69.6 6907 69.9 70.1 70.1 70.8E 4 5009 57.9 61.7 6,4 68.9 69.6 70.4 71.7 71.7 72.2 72.2 72.3 72.S 72.7 72.7 73.4

GE 80009 63.0 67.0 71.7 74.1 ?41.: 73.8 77.4 77.4 77;9 77.9 78.1 78.4 78.6 78.6 79.3GE 3SO0 65.7 69.9 78.6 77.0 77;7 78.8 80.3 80.3 80.9 80.9 81.0 81.- 816 81.6 82.3GE 309 68.7 72.9 77.9 80.9 81.6 82.6 81.2 8%.2 407 84.7 84.9 5.2 85. 85.4 86.1

GE 25001 70.3 714 79.5 82.4 83.1 84.2 85.7 85.7 86.3 86.3 86.4 86.8 87.0 87.0 87.7C GE 20001 12;3 76.5 816 84.5 5.2 86.8 88.0 88.0 88.5 88.5 8907 89.0 89.2 89.2 89.9

GE 18009 72.3 76.5 81.6 88.S 652 86. $88.0 88.0 8.5 88.5 88.7 89.0 89.2 89.2 89.9GE S00 73.0 77.8 82.4 85.8 86.1 87.3 88.9 88.9 89.4 89.81 89.6 89.9 90.1 9".1 90.8G 1200 71*.$ 79.3 80.3 87.3 66;0 89.2 90.8 90.8 91.3 91.3 91.5 91.8 92.0 92.0 92.7

GE 10001 0.0 85.: 788. 89.4 90.6 92.2 92.2 82.7 92.7 92:9 93.2 93.8 93.4 98.1GE 9001 15.7 0.2 85.6 88.9 89.6 90.8 92.3 92.3 92.9 92.9 93.0 93.4 93.6 83.6 98.3GE 80o 75.B 80.3 85.9 89.2 89.9 91.1 92.7 92.7 93.2 93.2 93.8 93.7 93.9 93.9 94.6

GE 700| 74.3 80.9 848 89.9 90.6 92.0 93.6 93.6 98.3 94.3 98.8 98.8 95.0 93.0 95.7GE 600. 76 81. 87.0 90.8 91.5 92.9 984 94.4 pS.j 95.1 95.3 95.7 95.8 9%.9 96.5

SE SOO 76.9 $1.7 87.5 91.7 92.3 93.7 95.3 95.3 96.0 96.0 96.2 96.5 96.7 96.7 97.8O GE 400 76.9 81.7 87.5 91.7 92.3 94.3 95.8 95.8 96.S 96.5 96.7 97.0 97.4 97.6 98.3

GE 3QO1 7.6*9 1.7 87.5 91.7 92.3 94.3 95.1 9S.8 98.5 96.9 97.0 97.4 97.7 98.3 99.0GE 2001 76.9 81.7 87.5 91.7 92.3 94.3 9b.0 96.0 96.7 97.0 97.2 97.6 97.9 98.8 99.1o tE oo 760.9 81.7 67.5 91.7 9203 94.3 96.0 96.0 96.7 970 97.2 97.6 98.1 90.6 100.0

GE 01 16.9 81.7 87.5 91.7 92.3 98.3 96.0 96.0 96.T 97.0 9?.2 97.6 90.1 98.6 100.0...... ...... ....... ... .... .................. ......... .............................

IOTAL NURSER Of B3SEIVATIONSs 573

--4 ,nni. n iirn nliiigmamn

0

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATpHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAMET: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-67MONTH: JUL HOURSILST)t O30O1.O .O........ ........... ... ........ .............. ... ................ ........ ...................... ... .... ..... 0 . . ,

CEILING VISIBILITY IN HUNDREDS OF METERSIN I ST GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

O FEET I 160 90 60 60 R8 10 32 2 20 16 12 10 8 5 V 0

O NO CEIL 2 4R.S 26.7 30.1 32.6 33.6 3S.3 36.1 36.6 37.4 37.5 37.6 37.6 38.6 38.6 39.

GE 20001G 27.6 30.0 34.1 36.8 38.0 39.B .7 4i.2 R2.0 '.2:3 '12:S 42:7 93.5 43.6 :.,:1,BE 18 000 27.6 30.0 3f..1 36.8 38.0 39.6 '0.7 1 .2 '.2.0 23 .2. 5 .,23.8 9'..'.GE 160001 27.6 30.0 34.1 36.8 38.0 39.8 '0.7 '11.2 42.0 142.3 42.S '2.7 43.5 '3.8 4.'.6E 10001 27.6 30.0 34.1 36.8 36.0 39.8 40.7 41.3 '2.2 '2.5 '.2.8 '.2.9 '3.8 44.0 44.76 BE 120001 27.6 30.0 3#.1 36.8 380 39.8 '0.7 '1.3 '2.2 42.S 92.8 R2.9 '3.6 44.0 1.7

6E 100001 30.0 32.6 37.6 40.3 411.'s R3.3 9.2 RR.9 45.0 '.6.2 R6.R 46.S 47.6 1 7.9 '8.7O BE 90001 30.5 33.1 38.1 .0.9 422 '3.9 44.8 95.5 '.6.R 46.8 '7.1 '7.2 8.2 19R.6 49.3

BE 80001 33.1 36.1 '.1. 49.3 .5.S 7.3 .6.2 '8.9 '9.8 50.2 50.' 50.6 51.6 S1.9 52.7GE 70001 33.2 36.3 '2.0 44.8 46*2 47.9 '8.9 '9.7 50.6 50.9 51.2 51.3 52.3 52.7 53.56E 60001 33.b 36.6 42.S 45.3 .6."7 '46.9 49.' 50.2 51.1 51.' 51.7 51.8 52.8 53.2 54.0

BE 50001 37.0 %D.3 116."5 '9.9 51.'. 53.3 S'.3 55.1 56.0 56.5 56.7 56.6 57.6 SR.2 S9.0oE '.500O 39.9 '3.3 '9.6 13.5 SS.1 57.0 58.1 59.0 Sg9. 60.'. 60 607 61.7 67.1 62.9GE '0001 4S.2 '9.1 56.1 S9.8 61;5 63. 6eS 65.' 66.2 66.9 67.1 67.3 66.3 66.6 69'.GE 350G1 98.1 S2.1 59.5 63.2 64!9 66.9 68.0 66.9 69.6 70.'. 70.6 70.8 71.8 72.1 72.9G BE 30001 '.9.7 S%,2 62.0 66.1 67.8 70.0 71.1 72.0 73.0 73.7 73.9 7.0 75.2 75.5 76.3

BE 2Sool SI.' S6.1 64.0 66.1 69.6 72.0 73.1 74.O 75.0 75.7 7S.9 76.0 77.2 77.5 76.3o BE 20001 59.2 S.6 67.1 71.3 72;9 75.3 76.5 77. 76. 79.0 79.3 79.9 10.6 60.9 61.?SE 1001 5'..7 59.3 67.6 71.6 73.94 75.8 77.0 77.9 76.9 79.5 79.6 79.9 61.1 61.9 82.26E 15001 55.8 60.5 64.9 73.0 79.7 77.2 76.' 79.3 80.. $1.1 81.3 $1.% 82.6 82.9 83.7BE 12001 ST.3 62.1 70.9 75.2 76.8 79.3 80.6 61.9 82.6 83.2 83.4 63.6 8.6 65.2 85.9

BE 10001 58.3 63.1 72.3 76.7 78.'. 80.9 62.2 83.1 8'.2 69.8 85.1 65.2 66.6 67.0 67.8C BE 9001 $8.6 63.5 72.9 77.3 79.0 81.6 2.6 83.7 896 65.' 65.7 65.6 67.2 67.6 :

BE :0 56.7 63.7 73.' 77.9 79.7 820' 63.7 64.6 65.7 66.3 86.6 86.? 66.1 085 69.3GE 7001 59.3 64.5 79.7 79.3 81.1 83.6 65.1 65.9 87.1 7?7 86.0 68.1 89.5 69.6 90.7BE 6oal 59.7 6'.9 75.3 79.9 $1.6 8'.7 65.9 66.6 66.1 as.7 89.0 69.1 90O5 90.0 92.0

:E 5001 59.6 65.0 ?5.. 60.2 62.1 :S.1 86:6 :72 .8:6 69.2 69.5 89.6 91.0 91.3 92.5BE ooi 60.0 65.1 75.7 60.6 62.' 65.6 86.87.7 69.2 69.8 90.1 90.2 91.6 92.0 93.1BE 302 60.0 65.1 7S.9 60.6 82.7 65.9 87.3 88.2 90.2 91.1 91.5 91.6 93.1 93.5 95.2BE 2001 60.0 65.1 ?S. 60.9 82.6 i6.' 67.6 6O.7 91.1 92.1 92.6 93.0 9'.9 9S.2 97.5

CB 1001 60.0 65.1 75.9 60.9 $2.6 66.N 67.6 66.7 91.1 92.1 92.6 93.0 94.9 95.7 100.0

BE ol 60.0 65.1 75.9 00.9 82.6 86.' 87.6 $0.7 91.1 92.1 92.6 93.0 99.9 95.7 100.0. .................................

TOTAL NWER Of OBSERVATIONS: 797

P H_

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Of CEILING VERSUS VISIBILITYUSAFETAC FROM PI40ULY OBSERVATIONSAIR hEATHER SERVICE/AC

STATION NUMBER: 033623 STATION NANE: RAF ALCONBURY UNITED NINGOON PERIOD OF RECORD: 70-a7MONTH: JUL NOURSILSTI: 0600-0600

C.... . ................................. . • ........... . ..U.........CEILING VZSIBILITY IN HUNOREDS OF METERS

IN 1Of GE GE 6E GE GE GE GE GE GE GE GE GE GE GE GE0 FEE, I 160 90 80 60 6 60 32 26 20 16 12 10 B .5 6 0

- NO CEIL 1 23.6 2S.6 27.9 29.6 30.3 31.2 31.6 31.9 32.11 32.4 32.6 32.6 32.7 12.7 32.7

St 20001 26.6 26.6 31.6 33.3 34.0 35.6 35;9 36.6 37.2 37.4 37.4 37.6 37.8 37.9 37.9GE 160001 26.S 28. 31.7 33.S 36.2 3S.7 36."0 36.5 37.3 37.6 37.6 37.6 37.9 36.0 38.0GE 160001 26.S 28.4 31.7 33.6 3S6.3 3S5. 36.2 36.6 37.4 37.7 37.7 37.7 38.0 36.1 38.1GE 160001 26.S 20.6 31o7 33.6 36#.3 35 oB 36.2 36.6 37.6 37.7 37.7 37.7 36.0 38.1 38.1GE 120001 27.1 29.S 32.4 34.3 35.0 36.S 36.9 37.4 38.5 36.7 38.7 3B.? 39.1 39.2 39.2

GE 100001 30o.5 33.1 36.2 36.1 366 40.5 41.0 41.7 42.7 63.0 63.0 43.0 43.3 43.5 63.5G 9C001 31.6 34.3 37.3 39.3 40.0 41.7 62.1 42.6 43.9 66.1 6.1 44.1 66.5 4.7 66.7GE 60001 3S.9 36.6 411.8 4.0 44.6 466 47.1 47.8 4.6 49.1 49.1 69.1 49.4 49.6 49.6GE 70001 36.5 39.2 6 42.6 66.0 6s5.7 47.6 67.9 48.6 49.6 69.9 49.9 49..9 SO.2 50.5 50.5GE 600'1 36.7 39.6 62o6 6S2 46.1 47.9 46.4 49.1 50.1 SO. SO. SO. 0o.7 509 50o.9

GE SOQO 60OS 63.2 %7.1 69.6 SO.6 2.3 52.8 53.6 S46. 55.0 SS.0 SS.0 ss. SS.6 55.6E G 60s0 66.0 66.7 50.6 S3.2 5l SS.9 S6.3 57.2 So3 56.6 566 6.6 56.9 59.2 59.2

GE 60GO SO.0 53.1 57.S 60.3 61o3 63.1 63.6 66.6 65.6 4S.8 65.6 66.0 66.3 66.5 66.5GE 36001 51S3 56.6 $9.2 62.1 63;1 6S.0 65.5 66.4 67.7 60.2 68.2 6603 68.7 69.0 69.0

E G 30001 so01 57.6 62.6 66.1 67.1 69.1 69.7 70.7 71.9 72.6 72.6 72.7 73.0 73.4 73.4

GE 25001 56.S 60.6 6S.6 689 7090 71.9 72.'5 73.5 76.6 is. 7S.60 73.6 TS.9 76.3 7b.3&E 20001 59o0 63.0 64.3 71.6 72.7 76.6 7S.S 76.6 77.7 74.3 76.3 78..5 76.9 79.2 79.2GE 19001 59.7 63.7 69.0 72.3 ?3.s 1SS 76.3 77.2 Tos 79.1 79.1 79.3 79.7 80.0 60.0GE IS001 61.5 6S.6 7100 76.3 7S.6 77.6 76. 79.5 0.6 61.3 81.3 61.6 61.9 82.3 62.3

Q GE 12001 63.6 67.8 73.2 76.s 77.6 79.6 60.6 61.7 S3.1 63,7 83.7 63.9 66.3 66.6 64.6

GE 10001 65.0 69.6 76.8 7. 8O, 62.0 62.9 63.9 65.3 65.9 65.9 66.2 65 69 66.90 GE 9001 6S. 69.7 7S.5 79.1 60.6 82.7 63.7 647 66.2 6.7 66.7 67*0 67.3 67.7 67.7

GE 001 66.6 70.6 76.6 60.6 42;0 64.2 6.1 66.2 87.6 66.1 66.1 6.4 66.7 69.1 09.1GE 7001 66.6 71.5 77.6 61.6 A3;6 I5. 66.9 67.9 69.3 69.9 89.9 90.1 90.1 91.6 90.6E G 6001 67.1 71.8 76.2 62.2 63.9 66.3 67.6 66.S 89.9 90.S 90.S 90.7 91.1 91.6 91o7

GE S001 67.6 72.2 78.6 62.6 66.6 66.7 66.0 69.3 90.7 913 91.3 91.S 91.9 92.3 92.5GE 6005 67.6 72.3 79.0 3.l 651 67.8 :9.1 90:4 92.0 97.6 92.6 92.6 93.3 93.7 940GE 3001 67.6 72.3 79.0 03.1 65.1 68.0 69.3 90.7 92.7 93.3 93.5 93.8 94.1 95.1 96.2GE 2001 67.4 72.3 79.0 63.1 65.1 66.0 69.3 90.6 93.o 93.S 93.9 96.2 95.1 96.2 96.5:c 1005 67.6 72.3 79.0 63.1 65.1 89.0 s9.3 90.8 93.0 93.S 93.9 96.2 9S.1 96.5 100.0

GE 01 67.6 72.3 79.0 63.1 6.1 66.0 69.3 900.6 93.0 93.5 93.9 96.2 9S.1 96.S 100.0

o..*................................................. ................... . ........... o....... .. ...........

TOTAL NU ER Of OBSERVATIONS, 652

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR VEATN[fE SERVICEIMACSTATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 78-AT

MONTH: JUL HOURSILST): 90-1100

.................................................................................................................................................CEILING VISIBILITY IN HUNDOEDS OF METERS

IN i G E G GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET 160 90 80 60 li8 110 32 2 20 16 12 10 a S *; 0

NO CESL .26.0 26.9 Z8,1 28.8 28.8 29.0 29.1 29.1 29.1 29.1 29.1 29.1 29.1 29.1 29.1

GE 200001 10.9 31.9 33.1 341.0 311.0 311. 1 31.5 311.5 3915 3115 3905 3q05 311. 39,5 34.5GE 10001 31.0 32.0 33.3 31.2 34.2 31.5 31.6 34.6 31.6 31.,6 3906 311.6 311.6 34.6 31.6GE 160001 31.0 32.0 33.3 311.2 311.2 311.S 311.6 31.6 34.6 31.6 34.6 311.6 311.6 34.6 34.6GE 110001 31.2 32.3 33.5 311 .# 31.1 311.7 31.,8 311.8 311.8 311.8 311.8 311.8 34.8 31.8 311.8GE 120001 32.1 33.1 3q111 35.3 35.3 35.6 35.8 35.8 35.8 3S.9 3S.8 35.8 35.8 35.8 35.8

GE 100001 !5.4 36.10 37.7 39. 0 39.1 39.5 39.8 39.8 39.9 39.9 39.9 39.9 39.9 39.9 39.9GE 90001 35.9 37.0 38.3 39.5 39.6 10.l 10.3 01103 14001 11010 110 10:11 110. 10:.4 0:D4GE 800 101 1.12 12.7 11.3 4140.S 115.0 15.2 15.2 15.11 115 115o10 115.11 11 .11 i5.11 1151GE 70001 11.0 12.2 13.7 15.1 15'.5 116.0 16.2 16.2 16.1 116.1 16.1 6 6.11 116.1 116.1 116.11G 60001 111.5 12.8 111.2 15.9 16.0 146.6 16.8 116.8 46.9 16.9 16.9 16.9 16.9 16.9 46.9

BE 50001 911.9 16.2 17.7 119.S 19;6 50.11 0O.6 50.6 50.7 50.7 50.7 50.7 so.? 50.7 50.7GE 15001 17.1 18.5 19.9 S17 51.8 52.6 S2.9 52.9 53.'0 5.0 S3:0 53.0 S3:0 53.0 53:0GE 10001 5#14; 55.9 57.3 59.6 59., 60.6 60.9 60.9 61.1 61., 61.1 61.1 61.1 61.1 61.1GE 35001 6D.5 62.0 63-;6 6S.8 66.1 66.9 67.3 67.3 67.5 67.5 675 67.S 67.5 6705 67.5GE 30001 68.0 69.7 71.3 73.8 71.0 710.9 75.1 75.1 75.6 75.6 75.6 75.6 75.6 75.6 75.6

GE 2500J 72.0 73.8 75.6 78.2 7.1 79.3 79.7 79.7 80.0 80.0 80.0 80.0 80.0 80.0 su.0GE 20001 76.1 78.1 80.0 82.6 62.9 83.8 811.3 811.3 81.5 81.S 84.5 8q.S 8.5 81.5 81.5GE 18001 76.6 78.5 80.1 83.1 83.3 811.2 811.8 811.8 85.0 85.0 85.0 65.0 85.0 85.0 85.0GE 1SOol 79.7 81.6 811.0 86.7 86;,9 7.8 88.1 88.4 88.6 88.6 88.6 88.6 88.6 88.6 88.6GE 12001 82.5 811.7 87.3 90.3 90.'S 91.5 92.0 92.0 92.3 92.3 92.3 92.3 92.3 92.3 92.3

GE 10001 83.5 85.8 88.8 91.8 92.0 93.1 93.6 93.6 93.8 91.8 93.6 93.8 93.8 9l.8 93.0GE 9001 83.7 85.9 89.0 92.0 92.3 93.1 91.1 91.1 91.3 94*.3 911.3 901.3 91.3 910.3 941.3GE 8009 84.3 86.6 89.9 93.2 93.1 911.6 95.3 95.3 95.6 95.6 95.6 95.6 9S.6 95.6 95.6GE 7001 811.8 87.1 90.6 93.8 911.2 95.6 96.3 961 96.8 96.8 96.8 96.8 96.8 96.8 96.8GE 6001 811.9 87.2 90.7 911.0 911.14 95.9 96.5 96.6 97;1 97.1 97.1 97.1 97.1 97.1 97.1

GE 500 811.9 87.2 91.2 911.1 911.0 96.3 97.1 97.2 97.6 97.6 97.6 97.6 97.6 97.6 97.6GE 100 81.9 07.2 91.2 91.11 94;.8 96.3 97.2 97.3 98.1 98.2 98.2 98.2 98.2 98.2 98.2GE 3001 811.9 87.2 91.2 91.1 91.8 96.1 97.8 97.9 98.8 98.9 99.0 99.3 99.3 99.3 99.3GE 2001 81.9 87.2 91.2 911.1 910.8 96.5 97.8 97.9 90.8 98.9 99.0 99.3 99.8 99.9 99.9GE 1001 84.9 87.2 91.2 91.11 941.8 96.5 9?.8 97.9 98.8 98.9 99.0 99.3 99.8 99.9 100.0

GE O 111.9 87.2 91.2 9.11 901.8 96.5 97.8 97.9 98.8 99.9 99.0 99.3 99.8 99.9 100.0

.......................................................................................

TOTAL hUMB r OF OBSERVATIONS: 893

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOUqLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOGURY UNITED KINGDOM PERIOD OF RECORD: 78-07

MONTH: JUL HOURSILSTI: 1202-14910

CEILING VISIBILITY IN HUNDREDS OF METERSIN G G 7 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

o FEET I 160 90 80 60 8 40 32 24 20 16 12 10 8 5 4 0o.. .. ............ . . ................................... 4 ...................................................

o NO CEIL 5 25.7 26.6 27.9 28.4 28.4 28.4 28.4 28.4 28.4 28.4 28.4 28.4 28.4 28.4 28.4

GE 200001 32.2 33.2 3S.0 35.6 3. 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.6 35.60 GE 180001 32.4 33.4 35.2 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8GE 160001 12.4 33.4 35.2 35.8 35.8 35.8 35.8 35.8 35.8 35.8 35.8 3S.8 35.8 35.8 35.8GE 140001 32.7 33.7 35.6 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1 36.1

C' GE 120001 34.0 35.0 36.'9 37.4 37.4 37.4 37.4 37.4 37.*4 37.4 37.4 37.4 37*4 37.4 37.4

GE 100005 !6.8 37.7 39.8 40.7 40.8 40.8 40.8 40.8 40.8 413.8 40.8 40.8 40.8 41.8 40.8o GE 9(001 37.1 38.1 40.1 41.0 41.'1 41.1 41.1 41.1 41.1 41.1 41.1 41. '1 41.1 41.1 41.1GE 80001 41.5 42.5 144.6 45.7 45;8 45.8 45.8 45.8 45.8 4S.6 45.8 45.8 45.8 45.8 45.8GE 70001 42.6 43.6 4507 46.8 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9

0 GE 601001 42.6 43.6 47 46.8 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46.9

GE 50003 47.0 48.0 50.:2 S1.4 5.5 51.5 51.5 51.5 51.5 51.5 51.5 51.5 S1.5 51.5 51.5GE 45001 so.; S1.0 53.2 54.5 54.6 54.6 54.6 54.6 S4.6 54.6 54.6 54.6 S4.6 54.6 54.bGE 40o01 61.5 62.5 64;7 66.1 66.2 66.3 66.3 66.3 66;6 66.6 66.6 66.6 66.6 66.6 66.6GE 35001 69.7 70.9 73.1 74.6 74.7 74.8 74.8 74.8 75.1 75.1 75.1 75.1 75.1 75.1 7s.1GE 30001 77.9 79.2 81.6 83.2 83;4 83.6 83.6 63.6 84.0 84.0 84.0 84.0 84.0 84.0 84.0

GE 25001 02.7 84.0 86.4 88.0 88;2 88.4 88.4 88.4 88.8 88.8 88.8 88.8 18.8 88.8 88.8GE 20001 86.2 87.6 90.2 92.0 92.3 92.S 92.5 92.5 92.8 92.8 92.8 92.8 92.8 92.8 92.8GE 18001 86.4 87.8 90.4 92.3 92.5 92.7 92.7 92.7 93.0 93.0 93.0 93.0 93.0 93.0 93.0GE 15001 87.9 69.4 92.4 94.2 941.4 94.8 94.8 94.8 95.1 95.1 95.1 95.1 95.1 95.1 95.1GE 12001 88.S 90.2 93.3 95.3 95.'5 96.1 96.1 96.1 96.41 96.41 96.4 96 *.4 96.4 96.4 96.4

GE 10001 89.5 91.2 94e4 96.14 96.6 97.2 97.2 97.2 97.5 97.5 97.5 97.5 97.5 97.5 97.SO GE 9CiOI 89.5 91.2 94.4 96.4 96.'6 97.2 97.2 97.2 97.5 97.5 97.5 97.5 97.5 97.5 97.5

GE 8001 89.6 91.4 94.9 96.8 97.1 97.7 9707 97.8 9 .1 98.1 98.1 98.1 98.1 98.1 90.1GE 7005 09.7 91.5 95.0

9 72 97.5 98.1 98.1 98.4 98.8 98.8 98.8 98.8 98.8 98.8 98.8

GE 6L01 89.7 91.S 95.1 97.4 97.8 98.5 98.5 98.7 99.1 99.1 99.1 99.1 99.1 99.1 99.1

GE 500 89.7 91.5 95.2 97.6 98.0 98.8 98.8 99.0 99.5 99.5 99.5 99.5 09.5 99.5 99.5* GE 4005 89.7 91.5 95.2 97.6 98.0 98.8 98.8 99.0 99.7 99.8 99.8 99.8 99.8 99.8 99.0

GE 3001 89.7 91.5 9S,2 97.6 98.0 99.0 99.0 99.2 99.9 100.0 100.0 100.0 100.0 100.0 100.0GE 2001 89.7 91.5 95.2 97.6 98.0 99.0 99.0 99.2 99.9 100.0 100.0 100.0 110.0 100.0 100.0GE 100t 89.7 91.5 95.2 97.6 98.0 99.0 99.0 99.2 99.9 100.0 100.0 100.0 100.0 100.0 100.0

GE 01 89.7 91.5 95.2 97.6 98.0 99.0 99.0 99.2 99.9 100.0 100.0 100.0 100.0 101.0 100.0

.............................................................. ..................................................................................


* L

-mJmmmmummm d l

6/

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO46URY UNIIO KINGDOM PERIO0 Of RECORO: 78-87

MONTH: JUL HOURSiLSTI: 1500-1130

CEILING VISIBILITY IN HUNOREO5 OF METERSIN S 6T GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 98 80 32 28 20 16 12 10 8 5 4 0......... .......... ...................................................................................................

NO CEIL 1 27.8 28.8 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29.9 29,9 79.9 29.9 29.9

GE 200001 36.0 37:2 38.? 39:0 39.0 390 39:0 39.0 39.0 39.0 39.0 39.0 39.0 39.0 390o

GE 180001 36.? 37.9 39.3 39.7 39.7 39.? 39.7 39.7 39.7 39.7 39.7 39.7 39.7 39.7 39.7GE 160001 36.8 38.0 39.5 39.8 39.8 39.8 39.8 39.8 39.8 39.8 39.8 39.8 39.8 39.8 39.8GE 140001 37.2 38.5 39.9 40.2 40.2 40.2 40.2 40.2 40.2 N0.2 40.2 40.2 40.2 .0.2 0.2GE 120001 37.8 39.0 4o.5 40.8 4O.e NO.8 40.8 40.8 %o8 40.8 4O.6 40.8 40o.8 40.8 40.8

GE 100001 92.N 43.6 45.6 %6.1 N5.1 46.1 46.1 46.1 46.1 46.1 46.1 N6.1 46.1 86.1 46.1oGE 90001 83.2 4901 86.8 87.1 47.1 47.1 87.1 47.1 47.1 47.1 4T.1 %T.1 47.1 4?.1 47.1GE 80001 s1i"S 52:7 SN.? 5.1 550 555. 545 S 55. SS.% 55.4 55. S5S. 55.4 55.8 55.4GE 7000| 52.5 53.7 S5.7 56.4 S6.46 56.4 $6.4 S6.0 6.8 50.4 56.1 56.4 56.4 56.4 56.4GE 60001 52.? $3.9 55.9 56.6 S6.6 S6.6 56.6 S6.6 56.6 506. 56.6 S6.6 56.6 56.6 56.6

GE 5001 57.8 59.1 61.1 61.9 61.9 61.9 61.9 61.9 61.9 61.9 61.9 61.9 61.9 61.9 61.9GE N5001 68.5 65.8 67.9 68.7 6807 68.7 68.7 68.7 60e,7 68.7 68.7 68.7 68.7 68.7 68.7GE NOIOj 74.6 75.9 78.3 79.0 79.0 79.0 79.0 79.0 79.0 79.0 79.0 79."0 ?9. 0 79.0 79.0GE 35001 80.4 81.8 88.2 8S.O 8s5O 85. 85.0.0 83.0 s;o ss.0 85.0 85.0 85.0 85.0 85.0E 3000 8.6 86.3 887 89.5 89;5 89.6 89.7 89.7 89.7 898 89.08 89.8 89.8 89.8 89.8

GE 2S001 87.0 8808 91.1 91.9 91.9 92.0 92.2 92.2 92.2 92.3 92.3 92.3 92.3 92.3 92.35E 20001 86.9 90.8 93.3 94.1 94.1 94.2 94.3 94.3 98.1 94. 94.8 98.4 91.8 94.4 944GE 18001 89.3 91.3 93.7 94.5 94.9 94.6 94.7 98.7 98.7 948 98.8 98.8 94.8 98.8 9%8.GE 15001 90.8 92.7 9 5. 96.3 96.3 96.4 96.9 96. 960.5 960.6 96.6 90.6 96.6 96.6 96.6GE 12001 91.8 93.8 96.1 97.0 97;0 97.1 97.2 97.2 97.2 97.3 97.3 97.3 97.3 97.3 97.3

GE 10001 91.7 93.9 97.0 97.9 97.9 98.1 98.2 98.2 98.2 98.3 98.3 98.3 98.3 94.3 98.3

GE 9001 91.7 93.9 97.0 97.9 97.9 98.1 98.2 96.2 98.? 96.3 98.3 98.3 98.3 98.3 91.3GE 8001 91.7 93.9 97;N 98.3 983 98.7 98.8 98.8 98.8 98.9 98.9 98.9 98.9 90.9 98.9GE 7001 91.7 981.2 97.6 98.5 98.S 980.9 99.1 99.1 99;1 99.2 99.2 99.2 99.2 99.2 99.2

GE 6001 91.7 98.3 97.9 98.8 98.8 99.1 99.3 99.3 99.3 99.8 99.8 99.8 99.8 99.4 99.8

GE 5001 91.7 98.3 97.9 98.0 980.8 99.2 99.4 99.8 9. 99.6 99.6 99.6 99.6 99.6 99.66E0 GE 800l 91.7 94o3 97.9 90o8 98.'8 99.2 99.8 99.8 99.4 99.6 99.7 99.7 99.7 99.7 99.7GE 3001 91.7 98.3 97.9 98.9 98*9 99.3 99.6 99.6 99.6 9907 99.9 99.9 99.9 99.9 99.9GE 2GO 91.7 90.3 97.9 90.9 98.9 99.3 99.6 99.6 99.6 99.7 100.0 100.0 100.0 100.0 100.0GE 1001 91.7 94.3 97.9 98.9 980.9 99.3 99.6 99.6 99.6 99.7 100.0 100.0 100.0 100.0 100.0

GE aJ 91.7 98.3 97.9 98.9 98..9 99.3 99.6 99.6 '9.6 99.7 100.0 100.0 110.0 100.0 100.0............ ......... ... ... . . .... ... ........... .. .... *..................... ............ ................


.1°_-1

- . w- W-

I I

O GLOBAL CLINATOLOGI BRANCH PERCENTAGE FREQUENCY OF OCCUR ENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBERS 035623 STATION NAMES RAF ALCO14BURY UNITED KINGDOM PERIOD OF RECORO: 76-6?MONkH: JUt. HOURS(LST): 1800-2r00

CEILING VISIBILITY IN HUNOREOS OF METERSIN |61 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEO FEET | 160 90 so 60 .98 0 32 29 20 16 12 10 a 5 1 0

S. ..........................................

0 NO C3lL I 5.1 36.6 37.6 38.5 36.5 308.8 38.8 36.8 38.6 36.8 36.8 36.8 38.8 36.8 38.8

GE 200001 42.$ 99.1 45.9 4166 96.6 97.0 97.0 97*0 97.0 97.0 97.0 197.0 17.0 47.0 97.0GE 160001 43.0 11.16 96.5 97.1 497.1 97.5 417.75 97.5 97.5 17.5 47.5 47.5 97.5 47.S 47.SGE 16000| 93.0 994.6 96.6 47. 97.1 47.5 117.5 97.5 47;5 17.S 97.5 17.5 47.5 97.5 17.SGE 140001 93.2 9.9 46.7 47.9 97.9 97.7 ?.7 97*7 97.7 7.7 117.7 97.7 17.7 7.7 97.7

SGE 1Zo00l 9.9 9s66 96.9 99.0 1990 99.9 19.9 1499 99.9 019.4 99.1 99.9 99.9 99.9 99.94

Gr 100001 50.6 S2.4 54.3 55.1 55.1 55.5 55. 55.5 55.5 SS.S S5.S SS.S 55.5 556. 55.50 GE 90001 62.9 59.2 56.1 S7.0 57.0 7.9 S 7.N S7. 57.9 57.4 57.4 57.9 5

7.11 57.11 57.9

GE 80001 59.9 61.9 69.0 65.0 65;0 6S.5 6SS 6SeS 65.5 65.5 65.5 65.5 65.5 65.5 b5.S

GE 70001 60.6 62.5 66.9 66.5 66.6 67.0 67.0 67.0 67.0 67.0 67.0 67.0 67.0 67.0 67.0o GE 60001 61.2 63.2 66.8 66.4 66.8 7.11 67.9 67.9 67.9 67.9 67.94 67.9 67.9 67. 67.9

GE 50001 6 6.9 17:7 70.5 71.6 71. 72.3 72.3 72.3 72.3 72.3 72.3 7Z.3 72.3 72.3 72.3GE 9SO 699 71.9 796 75.7 75.,9 71.9 761 76.9 76.9 76.9 76.9 76.01 76.9 76.9 76.0GE 0001 77.5 80.1 02.6 8.0 89.1 9.6 98106 69.6 69.6 90 89.8 89.8 89. 898 89.6GE 35001 60.6 63.9 86.1 87o2 8709 0.3 66.3 483 88.3 88.3 8.3 88.3 88.3 89.3 88.3

o GE 30001 83.9 66.6 69.9 90.6 91*0 91.9 91.9 91.9 91.9 91.9 91.9 91..9 91.9 91.9 91.9

GE 2S001 69.8 66.1 91.0 92.9 92.5 93.9 93.9 93.9 93.9 93.9 93.4 93.9 93.9 93.1 93.10 GE 20001 67.0 90.S 93.3 99.7 99.6 96.7 95.7 95.7 9s, 95.7 95.O 9.7 9S.7 9.7 95.7 95.7

Ge 38005 87.5 91.0 93.6 9S.2 9S. 96,3 96.3 96.3 96.3 96.3 96.3 96.1 96.3 96.3 96.3GE 15S0 67.7 91.9 99.2 96 95.7 96.6 96.6 96.8 96.8 96.6 96.8 96.8 96.6 96.8 96.8

o GE 1200 67.9 91.6 99.6 96.1 96.3 97.3 97.3 97.3 97.3 9?.3 97.3 97.3 97.3 97.3 97.3

GE laO0i 07.9 91.6 99.7 96.3 96.9 97.4 97.9 97.9 97.9 97.9 97.9 97.9 97.9 97.9 97.9o GE 9001 66.9 92.1 96.9 96.9 97.0 95.2 96.1 96.1 96.1 99.1 98.1 98.1 98.1 98.1 96.1

GE 800 56.6 92.3 9S.6 97.5 97.7 99.0 99.0 99.0 99.0 99.0 99.0 99.0 99.0 99.0 99.0GE ?00I 68. 92.5 95.9 97.5 97.9 99.2 99.2 99.2 99.2 99.2 99.2 99.2 99.2 99.2 99.2o GE 600 86s. 92.5 9S.9 97.9 96.1 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.9 99.9

GE 600 l.6 92.6 96.1 96.2 96.'3 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6GE 9001 88.6 92.6 9b.1 96.2 96.3 99,6 99.6 99.6 ,99.6 99.6 99.6 99.6 99.6 99.6 99.6GE 3005 66.6 92.6 96.1 96.2 96.3 99.6 99.6 99.6 99,6 99.6 99.6 99.6 99.6 99.6 99.6GE 2001 i*66 92.6 96.1 98.2 96.3 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.9 99.9 100.0

o GE 1001 1,6 92.6 96*1 9602 96.3 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.9 99.9 100.0

BE 0o 00 6 92.6 96.1 96.2 96.3 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.9 99.9 100.0........... .... .*.l l..........................

TOTAL NUNBER OF OBSRVATI@NSs ?S

-J

H

0GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM 1OSJRLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONDURY UNITED KINGDOM PERIOD OF RECORD: 76-67NONTH: JUL HOURSILSTI: 2100-2300

CEILING VISISILIIY IN HUNDREDS OF METERSIN i GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

o FEET I 160 90 60 60 96 Q0 32 29 20 16 12 10 6 S 9 0.......................................................................................................... ...........................

o NO CEIL W 90.3 41.0 93.9 4S.3 95.3 4S.9 96.1 46.1 46.2 46.2 96.2 96.2 96.4 96.9 46.4

GE 200001 99.9 46.6 19.6 *7 51o9 52.6 52.7 52.7 S2.9 52.9 S2.9 S2.9 53.0 53.0 53.0GE 1#0001 44.9 46.8 99.6 51.7 51.9 52.6 S2.7 52.7 S2.9 92.9 52.9 52.9 53.0 53.0 53.06E 160001 44.9 46.6 49.6 51.? 51.9 52.6 52.7 52.7 S2.9 52.9 52.9 52.9 53.0 53.0 53.0GE 149001 99.9 46.6 99.6 517 519 52.6 52.7 52.7 S2.9 32.9 52.9 52.9 53.0 53.0 93.0

G 120001 4S.6 47.6 50.9 S2.4 52.6 S3.3 S3.5 53.5 S3.6 53.6 53.6 53.6 53.8 53.a 53.8

GE 100001 49.8 52.0 S.6 57.0 37.2 97.9 S6.1 S8.1 S6.2 S8.2 56.2 58.2 S6.4 5.4 56.9E GE 9001 50. S2.6 S5.4 57.6 574 S6.S 6.7 6.7 56. S6.6 so. 56.8 59.o 59.0 39.0

GE 0001 SS.6 57.8 60.7 63.0 63"1 64.1 69.3 64.3 69.9 69.4 64.4 64.9 64.6 69.6 64.6GE 70005 56.6 59.0 61.9 64.1 64.3 65.3 65.S 6SS 65.6 65.6 6S.6 65.6 65.6 65.0 65.6oGE 60001 57.S 99.9 62.5 6Se. 69.2 66.2 66.9% 66.9 66.S 66.5 66.5 66.5 66.7 66.7 6607

GE 50001 60.6 63.4 66.4 68.7 66.9 69.9 70.1 70.1 70.2 70.2 70.2 ?g.2 70.0 70.9 70.9E 9soo1 64.6 67.9 70.9 72.7 72.9 73.9 79.1 74.1 74.2 79.2 79.2 74.2 794. 709. 79.9

GE 90001 71.1 79.7 776 6001 80;3 61.6 61o 01.8 1.9 61.9 81.9 81,9 82.1 62.1 82.1GE 35001 73.6 77.S go'? 63.1 83;3 94.6 94.9 89.9 69.2 05.3 5.3 65.3 8S*5 69.1 65SGE 300C1 77.5 81.s 849 87.3 87.9 #8.7 69.0 $9.2 69.S 69.6 89.6 69.6 69.6 69.8 89.6

GE 25005 76.5 12.7 $6.2 66.6 BB;,? 90.1 90.9 90.S 90.6 91.0 91.0 91.0 91.1 91.1 91.1o GE 20001 60.6 64.9 4.9 90.6 91.0 92.3 92.7 92.9 93.2 93.3 93.3 93.3 93.S 93.S 93.SGE 16001 s0.7 S.0 8.6 91.0 91.1 92.9 92.9 93.0 93;'3 93.5 93.9 93..5 93.6 93.6 93.66E 15001 60.9 65.2 U.9 91.3 91t% 92.7 93.3 93.5 93.8 93.9. 93.9 9309 99.1 99.1 94.1o 6E 12001 01.3 65.9 69.9 92.9 92.6 93.9 99.5 9.6 95.1 9S.3 9S.3 9S.3 95.4 9S.9 95.0

GE 10005 91.6 66.2 9O.S 93.2 9303 94.7 9S.3 95.6 95.9 96.1 96.1 96.1 96.3 96.3 96.3

E G 900J 62.2 16.8 91.3 93.9 94.1 9S.9 96.0 96.3 96.6 96.9 96.9 96.9 97.0 97.0 97.0GE 0001 62.2 a?.& 91.6 99.9 94. 95.9 96.4 96.7

9 7;0 97.9 97.S 97.S 9T,6 97.6 97.6

GE 7001 62.2 67.3 91.9 94.7 94;6 96.4 97.0 97.3 97.6 90.1 96.t 96.1 96.2 98.2 96.2G 6005 62.4 67.4 9o 95.0 95.1 96.7 97.3 97.6 9709 96.4 96.9 96.9 98.5 98.5 99.9

GE 5005 62.7 67.7 9207 95.7 95.9 97.5 96.1 98.4 96.7 99.1 99.1 99.1 99.3 99.3 99.3oGE 9001 62.7 67.9 92.9 91.9 96.0 97.6 96.9 98.7 99.0 99.4 99.4 9904 99.6 99.6 99.6GE 3001 62.7 67.9 92.9 9S.9 96.0 97.6 9864 96.7 99.0 99.9 99.4 990 99.6 99.6 99.6GE 2001 6207 67.9 92.9 95.9 96.0 97.8 964. 96.8 99.1 99.6 99.6 99.6 99.7 99.7 99.7GE 1001 027 87.9 9.9 9S9 96 0 97.6 98,A 96.8 99.1 99.7 99.7 9907 100.0 100.0 100.0

GE 01 62.7 67.9 92.9 9S.9 96.0 97.8 98.9 98. 99.1 9907 99.7 99.7 100.0 100.0 100.0eo~~eeeo ,00000 e ................ 0•000 0000e0 e •00 0BeBe,0•0 ........ e.0.. ......... 0 e00*.. ... 0 ....................... .

TOTAL NUMER OF OSIER VATIONSt 675

m - - nnL.ili miHiid i smi

GLOGAL CLINATOLOSU BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFE TC FROM HOURLV OBSERVATIONSAIR NEATNER SERVIEUMAC¢

STATION NUMBER:S 03523 STATION NANE: RAF ALCONNURY UNITED KINGDOM PERIOD OF RECORO 78-87MONTH: JUL HOURSILSTI: MLL

CEILING VISIBILITY IN PUOREOS OF METERSIN lIT SE BE GE GE GE SE GE BE SE SE GE SE GE GE GE

FEET I 160 90 s0 60 49 40 32 24 20 16 12 10 a S 4 0

* CEIL 1 290 31.2 33.2 34.3 34.6 3S.1 35.3 35.4 3S.6 35.7 3S.? 35.7 35.9 35.9 36.1

GE 200001 35.0 36.7 39.1 40.4 %0. 41 .4 41.7 41.8 42.1 12.1 42.2 42.2 42. 42.S 42.66E 16000i 35.2 39.9 39.1 45.7 %1.0 41.6 41.9 %2.0 420.3 42.0 42.4 4Z.4 42.6 *2.7 42.SE 160001 3S.2 36.9 39.4 60.7 41;0 41.7 41.9 42.0 42.3 42.4 42.4 42.S 42.7 42.7 42.BGE 140001 3S.% 371 39S 40.9 41*2 41.6 *2.1 :2. 2 42*2.6 42.6 42.7 42.9 42.9 43.1G 120001 36.1 31.9 *0.3 41.6 *2.0 *2.6 *2.9 2 3.0 *3.* 43.4 43. 430 43.7 *.7 43.9

GE 100001 39.6 *1.S ".2 4S.? 46.0 46.7 47.0 *7.2 47.S *7.6 47.7 47.7 67.9 48.0 46.1.o GE 9000 *0.* 42. 45.0 46.6 4969 47.6 *7.9 4*.1 48. goes 406 4..6 48.1 48.9 69.0GE 60001 4S.S 47.4 50.3 S2.0 52;4 53.2 S3.S 53.7 S*.O 54.1 S%.1 S%.1 54.3 S*. S%,6

E 00 4.3 *:3 1-003.0 53.3 S%41 .*3S 5*16 SSO S5.1 SS.1 S.1 SS. SS.% 55.661E 60041 4606 46.6 S 53.4 53.7 S*5 S4.9 5S.1 SS.4 55.S SS. 55.5 55.7 55.8 56.0

6 So00| 50. S2.7 SS.9 57.4 $812 S9.1 59.6 59.6 90.0 60.1 60.1 60.1 60e 63.*4 60.60G osooI 54.2 S6.4 59.6 61.6 92.1 62.9 63.3 63.5 6398 63.9 4.0 64.0 64.2 64.3 64.4

SE 40001 91.9 64.3 67.7 699 70.3 71.2 71.6 71.B 12.3 72.4 72.4 72.5 72.7 72.6 12.96E 3S001 64.1 6.8 72.3 T.% 749 7S. 76.3 76.5 77.0 77.1 77.2 ??2 77. 77.S ?1.7GE 30001 70

5 73.4 77.1 79.5 80.0 81.1 41,5 811 82.2 02.4 S2.6 02.S 82.7 62.8 83.0

GE 2SO01 73.1 76.1 79.9 62.2 620 63.6 a 43 8-, 35.0 61.2 65.2 65.3 65.5 65.65.6i[GE 20001 75. 76.9 82.8 05.2 85.7 868 $7.3 67.9 36.0 B6.2 66.3 6.4 690 66.7 a6.6GE 16001 762 79.3 63.2 6S.6 69.1 67.2 67.6 88.0 ses 68.6 6.? 66.6 89.0 69.1 89.2GE 1500i 77.5 B0.7 46.8 67.2 87,7 66.9 *9,N 690 90.2 90.4 90. 90.5 90.? 95.6 91.0

o) go 1200. 7.6 62 1 6,. 96.9 69.' 90.6 91.2 91.5 91.9 92.1 92.2 92.3 92.S 92.9 92.?

BE 10001 1.S 62.9 67.6 90.0 90.6 91.6 12.4 92.7 93.2 93.4 93.4 93.S 93.9 93.9 94.0o G 9001 79.8 63.2 87.6 90.4 91O.0 92.2 92.0 93.1 93.9 93.0 93.9 93.9 94.2 94.3 91.*lc01 60.1 63.5 U.4 91 91.7 93.1 93.6 93.9 94.4 94*7 94.? 9*.8 9S.0 9S.1 9S.3

BE 7oi g0.e3 63.9 :4;9 91.8 92.6' 93.9 9%Se 94.6 9S.3 95.6 9S.6 9S.7 95.9 96.0 96.2o GE 9001 6oes 8.1 89.2 92.1 92.' 94.3 94.9 9S.2 95.0 96.0 99.1 96.1 99.4 96.5 96.7

DE 100 60.6 86.3 69.5 92.S 93.2 94.7 9S.4 9S.? Vie3 96.S 966 996. 96.9 97.0 91.2GE :Doi $006 66.3 69.9 92.6 93.3 95.0 9s7 96.0 96.7 97.0 97.0 97.1 97.6 97.S 97.88E 3001 60.6 64.3 09.6 92.6 93.4 9S.1 9S.9 96.3 97.1 97.9 97.$ 97.7 96.0 98.2 96.6BE 2091 606 64.3 ag9A, 92.7 93.4 9S.2 96.0 96.4 9703 97.9 97.6 97.9 96.4 96.? 99.4

o 0E 1001 6g.6 66.3 09.6 92.7 93.6 95.2 99.0 96.* 97.3 97.6 97.6 96.0 96.5 96.6 100.0

K9 0 60.6 oe3 69.6 9207 93.6 9S.2 99.0 99.6 97.3 97.6 97.B 96.0 96.5 90.6 100.0......... ....................................

TOTAL NUMBER 6f OBSERVATIONS1 6379

|"

C) GLOBaL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC F ROM HOURLY OUSERVAlITONSAIR WEATHER SERVICEI/AC

STATION NUNK*: 035623 STATION NAME: RAF ALCO146URY UNITED KINGDOM PERIOD OF RECORD: 76-07MONTH: AUG tOURSILSTI: 0o0-0O0

................. .... . . ...... ..... .....................CEILING VlSIBILITT IN HuNOREOS OF METERS

IN ST GE GE GE G GE GE GE GE GE GE GE GE GE GE SEo FEET 160 90 o 60 48 40 32 214 20 16 12 10 6 5 4 0...............0. ..... ;....... ..........................................

O NO CEIL 39.0 402 13.9 145.1 146.1 17 .1 148614 o6.141 6.7 160 46..746. 4.7 480 149.1 19.1

G 200001 141.0 142.5 16-b 10.1 149.1 50.3 51.6 11.6 51.9 51.9 51.9 51.9 52.1 52.3 52.3') GE 180001 141.0 142.5 16.6 18.1 149.1 50.3 51.6 51.6 51.9 51.9 51.9 11.9 52.1 52.3 52.3

GE 160001 41.0 142.5 46.6 14:1 1 9

,L1

S0.3 516 $ 16 $1.9 51.9 1:9 S19 52.1 S2.3 52.3GE 1140001 11.0 12.5 46.6 461 19.1 10.3 516 51.6 5 1.9 9 S1t9 s59 52.1 52.3 52.3GE 120001 11.7 43.2 47.4 14.9 49.9 51.1 52.1 12.4 52.8 S2.6 S2.6 12,.8 S2.9 S3.1 53.1

GE 100001 143.6 45.1 149.6 51.5 52.9 14.3 1.16 5.6 11.9 S1.9 SS.9 51.9 6.1 56.3 56.3o GE 90001 137 1S.2 149.9 S2.3 S3.1 S4.8 S6.1 56.1 S614 16.1 S6.4 S6.14 56.6 S6.6 56.6

GE 60001 146.14 181 3.1 SS.4 56;6 58.0 59.3 19.3 0 0.0 6C.0 60.0 60.0 60.1 60.3 60.3GE ?ooo 47.1 418.7 13.6 16.1 17.3 50.6 10.0 60.0 0o.6 60.6 60.6 80.6 60. 61.0 61.0GE 60001 714 149.1 51.1 56.14 7;6 S9.0 60o3 60.3 61.0 61.0 61.0 61.0 61.1 61.3 61.3

GE So00a 49;% 11.4 16.14 19.1 6O.5 62.0 63.3 63.3 6A.0 614.0 64.0 611.0 614.2 64.3 64.3GE 1QO1 53.1 1.4 61.1 6.2 6.5 67.0 68.3 66.3 69*0 A

9.0

69.0 69.0 69.2 69.3 69.3GE 140001 17.6 60.0 66.7 70.0 71.4 72.9 74.1 714.4 7.00 7S.0 75.0 7S.0 7S.2 15.4 75.4GE 3MC0I 60.8 63.S 70.7 71*0 75.14 ?7.1 76.6 78.4 79.2 79.2 79.2 79.2 79.14 79.6 79.6E 30001 63.1 66.2 73.4 77.1 791% 0.1 81.6 8116 82.2 62.2 62.2 62.2 62.14 62.6 82.6

GE 25001 66.0 66.6 76.14 60.1 81.14 63.1 14.6 6184. 6.4 86.4 61.4 61. 61.6 65. 65.GE 20001 66.7 71.7 79.6 63.2 14.6 16.3 67.6 67.9 0.6 66.6 86.6 66.6 66.6 68.9 66.9GE 16001 66.6 71.9 79.7 63.4 614. 86.4 87.9 go. 868 66.8 6.6 66.6 8.9 69.1 69.1GE 15001 70.7 73.7 82.1 66.1 57.6 69.3 90.a 91.0 91.6 91.6 91.6 91.,b 91.6 92.0 92.0oG 12001 71.0 74.2 02.9 67.4 9.3 91.0 92.1 92.6 93.3 93.3 93.3 93.3 93. 93.6 93.6

GE 10001 71.1 74.7 63.14 68.4 90.1 91.6 93.3 93.1 914.1 94.1 914.1 914.1 94.3 94.5 91.1S0 GE 9001 72.2 75.1 6.1 69.1 90.8 92.S 94.0 94.1 94.6 914.8 91.6 914.6 91.0 95.1 95.1GE g001 72.4 71.7 446 69.6 91.3 93.0 914. 94.6 91.3 95.3 91.3 91.3 91.1 91.6 91.6GE 7001 72.5 71.0 64.9 69.9 91.6 93.3 91.0 95.1 91.8 91.6 95.6 91.6 96.0 96.1 96.1O 6001 72.7 76.2 86.1 91.1 92.6 914.1 96.1 96.3 97.2 97.2 97.2 97.2 97.3 97.1 97.1

GE S0| 72.7 76.1 66.6 92.1 93.6 91.1 97.3 97.S 96.3 98.3 96.3 96.3 [email protected] 96.7 96.7oGE 4001 12.7 764 66.6 92.5 94.1 916. 97.? 97.5 9607 95.7 96. 7 9 98. 99.0 99.06E 3001 72.7 716.5 6.6 92.6 94.3 96.0 97. 90.0 986. 96.6 99.0 99.0 99.2 99.3 99.1GE 2001 72. 76.S 66.6 92.6 914.3 96.0 97.8 96.0 9b.6 96.0 99.0 99.3 99.1 99.7 100.0

to GE 100 72.7 76.1 66.6 92.6 9143 96.0 97.6 96.0 90.0 98.6 99.0 99.3 99.S 99.7 100.0

GE a1 72.7 76.1 $66 92.6 914.3 96.0 97. 96.0 98. 986. 99.0 99.3 99.1 99.7 100.0............................ ........................ 0....... .........................................

TOTAL NUMNER OF OOSERVATIONSs 197

* K

0 GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATMER SERVICE/MAC

STATION NUNBERSO035623 STATION NAME: RAF ALCO1B4UNT UNITED KINGDOM PERIOD OF RECORD: 76-07K ONT: AUG HOURSILSTI: 0300-0500............................................................ .0..............•..

CE ILING VISIBILITY IN HUNDREDS Or METERSIN G1 GE GE GE GE 6E GE GE GE GE GE GE GE GE GE GE

FEEf 160 90 so 60 66 60 32 26 20 16 12 10 6 S 4 0

......................................................................................NO CEIL I 21S 29.9 33.2 36.6 35.3 36.6 37.7 36.1 36.6 36.9 39.1 39.3 39.3 39.6 39.8

GE 200001 31.6 34 37.5 39.3 40.2 610. 62.6 3.5 1.1 66.2 6.6 66.7 66.9 65.1 65.6E 160001 31.7 34.2 37.7 39.6 40.6 i 61.6 63.0 63.6 1.2 66.3 46.6 4.0 4S.1 65.2 65.6

GE 160001 31.7 31.2 37.7 39.6 40.. 61.6 63.0 63.6 66.2 66.3 46.6 6.8 4S.1 65.2 65.6GE 111001 31.9 36.3 37.6 39.s 40.S 61.7 63.1 43.7 6.6 66.6 66.6 45.1 15.3 65.6 %S.8G 1200 32.6 3S.3 36.6 45, 61.5 62.7 6.1 66.8 65.6 4S.7 45.9 66.2 66.6 66.s 66.9

GE 10000 36 37.3 61.1 63.1 66.1 65.6 6.6 67.5 66.5 64.6 6.9 69.1 691. 69.s 69.90 GE 90001 3S.6 36.1 020 16.1 .2 6.1 67.9 60.6 9.6 99.9 50.1 so..6 50.6 50.7 51.1

GE SC00S 39.9 63.0 67? 69.9 51.0 52.5 53.6 56.6 S6.3 S6.6 56.7 56.9 S7.3 57. 57.GE 70005 60.9 66.0 46.6 50.9 S2e.0 53.5 S.0 ss.6 57.3 ST.6 57.7 S7.9 $8.3 56.6 58.8

0 GE 60001 61.2 66.3 69.0 51.2 52;3 53.6 55.2 56.2 S7.7 57.6 S6O 56O3 S.6 56.6 59.1

GE 5000 66.3 07.6 12.8 SS.1 S6.2 57.7 59.1 60.1 61.9 62.0 62.2 62.5 63.0 63.1 63.5E 6S01 67.6 S1.o 56.6 56.6 59.9 61.5 63.0 64.0 6S.7 61.6 66.0 66.3 66.6 66.9 67.3

GE 60001 52.0 55.8 61.7 66.1 65.6 67.3 66.6 70.0 71.9 72.0 72.2 72.5 73.0 73.1 73.5GE 35005 53.6 $7.4 63.6 6.6 67.1 69.6 71.0 ?2.2 741 76.2 76.% 76.7 75.2 75.3 75.7G 30001 5S.7 S9.6 s.6 468.9 7,.2 72.1 73.6 7S.2 77.0 77.2 77.4 77.7 76.1 76.3 78.6

GE 2S001 SB30 62.2 6.6 71.7 73.1 76.9 76.7 76.0 79.9 05.0 60.2 0. 81.0 61.1 61.1GE 20001 61.2 6.8 72.3 75.4 76.9 76.9 600.6 2.0 83.0 8.0 06.2 66.6 86.9 65.1 6$.%GE 16001 61.2 65.6 72.3 7S.6 76.9 76.9 60.6 62.0 63.8 66.0 66.2 84%1 04.9 65.1 65.6GE 1S005 62.7 67.3 73.0 77.6 76.9 0.9 62.6 66.0 65.6 61.9 62 6. 69 67.0 67.6

o GE 12005 635 663 751 766 01 022 66.0 64:* 07.6 7.1 7.6 600 66.5 666 9.0

GE 10005 66.2 69.0 76.6 60.1 61.6 63.7 65.6 67.0 86.9 69.0 69.3 69.5 90.0 91.1 90.50 GE 9ooI 66.7 69.5 76.9 60.6 02.1 66.3 862 &7. 69.6 69.6 90.0 90.2 90.7 90.9 91.2

GE 60o 69.7 69.5 76.9 09 62.3 66.6 066 66.0 90:0 90.1 90. 90.6 91.1 91.2 91.6E 700, 66.6 69.9 T7. 61.6 62.6 65.1 67.2 66.6 907 90.9 91.1 91.4 91.9 92.0 92.3

GE 6601 66.6 69.9 77.I 61.7 83.2 05.6 87.7 69.5 91. 91.6 91.9 92.1 92.6 92.7 93.3

GE 5001 6S.1 70.6 76.9 63.1 66.6 67.2 69.3 91.1 93.1 93.2 930. 93.6 9603 9-.. 9S.1)G 60 65.1 70.6 76.9 63.2 66.9 67.6 69.9 91.7 907 93.6 96.1 96.6 9S.1 9S.2 91.9

GE 3001 6S.1 70.6 76.9 63.3 $5.1 67.9 90.1 92.0 90.1 94.2 96.9 95e3 95.9 96.0 97.3GE Nt2 65.1 70. 76.9 63.3 65.1 67.9 90.2 92.1 96.6 960 9S.7 96.0 96.9 97*2 96.9GE 100 6S.1 70.6 7809 13.3 5.1 67.9 90.2 92.1 96.6 96.7 9S.7 96.2 97.2 97.7 IGU.Q

of o 65.1 70.6 76.9 63.3 6.1 07.$ 90.2 92.1 96.6 96.7 95.7 96.2 97.2 97.7 100.0................ .........................................

TOTAL NUMBER Br OUSERWATIONSs 610

) GLOBAL CLIMAIOLOGY BRANCH PERCENTAGE FREOUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

"SAFETA C FROM HOUILY OBSERVATIONSAIR MEATHEA SERVICE/MAC

STATION NUMBERg 033623 STATION NAME: RAF ALCOIBURY UNITEDO INGOOM PERIOD OF RECORD: 71-97MONTH: AUG HOURSILS1I: 06O-O530

. .. . . ......... . . : ................ .... .. ........... .crLINGVISIBILITY I H EDS OF MEWS

IN 6 GE GE BE G BE 6 GE GE Bc GE GE BE BE GE GEoFEET 31 I60 90 so 60 q5 40 32 29 20 16 12 10 8 S 4 0

0 NO CEIL I 23.6 23.3 27.1 20.6 29.3 30.6 31.6 32. 32.9 33.1 33.2 33.2 33.3 35.7 34.1

GE 200001 27.S 29.2 31.6 33.4 39.1 33.5 36.9 37.5 3I.S 35.8 35.9 38.9 39.0 39.3 39.6GE 150003 27.9 29.4 32.1 33.9 34. 36.2 31.4 35.3 39.0 39.2 39.3 39.3 39.9 39.8 40.4GE 160001 27.9 29.6 32.1 33.9 3%.6 36.2 37.91 35.3 39.0 39.2 39.3 39.3 39.4 39.8 40.4GE 1%0001 26.0 29.6 32.2 340 3. 36.3 37.5 35.9 39.1 39.3 39.4 39.4 39.6 39.9 90.5

O GE 120003 29.0 30.9 33.3 35.2 35.9 37.S 35.6 39.5 40.3 40.S 90.1 90.6 90.7 41.1 41.5

GE 100001 31.1 33.1 36. 3 .S 39.3 91.1 92.2 43.1 44.2 4.9 9.S 49.6 4%.8 95.1 5.7

o GE 9000, 32.1 39.0 37.1 39.6 9C.9 42.1 93.3 44.3 45.6 45.5 45.9 96.0 6.1 91.S 47.1GE 80001 37.3 39.6 93.5 46.0 49.5 65.9 30.3 S1. 52.9 53.2 S3.3 53.4 SS3. 13.9 S4.GE 70001 37.7 90.1 99.2 46.6 7.9 9q9.S S0.9 52.0 S3. 53.9 39.0 39.1 $9.2 59.6 55.1E G 80001 37.0 90.3 99.3 46. 97.5 99.5 51.2 52.9 59.0 19.2 59.3 59.9 59.S 59.9 55

GE S0001 90.6 93.0 47.9 $0.5 $1.3 53.6 SS. 55.3 57.9 56.1 S8.2 5.* 58.6 50.9 59.5SGE 958o 9.9 95.9 52.0 S9.$ 55.6 S7.9 59.3 50.5 62.2 62.4 62.5 62.6 62.9 53.2 63.5GE 90001 95.1 S1.2 56.6 59.9 60.7 63.1 64. 65.0 67.7 67.9 55.1 65.2 5.4 6.7 69.3GE 35001 50.9 54.0 60.0 63.9 64.2 66.9 6.-2 69.7 71.5 717 71.9 72.3 72.2 72.S 73.1GE 30041 500 17.9 13.6 57.4 15.3 70.5 72.2 73.7 ?S. 751. 75.9 76.0 76.2 75.0 77.%

GE 2so0l 55.1 S9.6 6S.9 69.7 70.6 73.1 79.S 16.0 77.9 75.1 75.2 78.3 75.5 79.) ?9.7o GE 2003 58.2 52.1 64.6 72.8 73.5 76.4 77.7 79.2 51.1 51.3 81.4 51.5 81.8 52.4 52.9BE 10001 So.9 52.2 59.0 72.9 73.9 76.5 7. 79.9 61.2 51.4 i1.S 1.? 61.9 52.s 53.0GE 15001 60.0 690 71.2 7S.4 76.5 79.7 61.1 52.6 640 GO.7 I9o.5 84.9 55.1 IS.? 06.3oE 12001 61.9 5506 73.9 70.2 79.9 #2.5 54.0 IS.S 57.3 57.5 57.7 57.5 85.0 555 . 59.2

G[ 10001 52.1 55.3 740 75.9 5002 53.9 59.9 55.9 55.2 55.5 55.5 65.7 86.9 9.5 90.1oGE 900| 52.3 66.6 79.9 79.5 81o2 . 55.9 57.9 59.3 59.5 59.5 59.7 90.0 90.5 91.1BE 5001 62.3 66.6 79.6 53.2 51.S iS.0 666 Go.% *00.2 90.9 90.5 90.7 90.9 91.5 92.0GE 7001 62.5 67.2 75.5 51.4 52.5 55.5 l5.1 59.9 91.7 91.9 92.0 92.2 92.4 93.0 93.soGE 501 62.9 T.S Is.$ 51.5 53.2 86.9 88.6 90.3 92.2 92.9 92.5 92.6 92.B 931. 99.0

GE 5001 53.2 57.5 75b.9 52.7' 59.1 87.8 59.5 91.5 93.3 93.5 93.9 99.0 99.2 99.5 95.9o GE 9001 53.3 67.9 75.5 53.2 59.5 5.5 90.3 2.3 99.1 99.3 99.7 99.5 95.0 95.5 96.3

BE 3001 53.3 17.9 75.X 53.9 55.0 6.7 90.5 92.5 94.9 9.43 9s.$ 96.0 95.S 97.1 95.26[ 2001 53.3 57.9 75.5 53.9 65.0 so.7 90.5 92.B 9S. 9S.4 96.3 96.5 97.1 96.0 99.3SE 1001 63.3 67.9 6.5 53.9 5S.O @$.7 90.5 92.5 95.4 95.6 9&.3 96.S 97.2 99.2 100.0

BE Ol 53.3 67.9 76. 53.4 IS.0 so.? 90.5 92.5 9S. 9S.1 96.3 95.5 97.2 9B.2 100.0............................ .................................................

15OAL NUMBER of OOSl9ATIONSt a a7

-ii-4£

GLOOAL CLINITOLOSY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS vISIBILITYUSFtIaC FROM 140ULY OBSERVATIONS,in WEA NE[ S S0ft CEJ41AC

STATION NUMKHt 03S623 STATION NAME* RAF ALCONIOuR9 UNITED KINGOM PERIOD OF RECORD: ?8-47

MONTH: AUE HOURSILST: 0900-0 Lao

CEILING VISIBILITY IN HUNDREDS OF 04ETERS

u 6E 6 G E( 6E 6E GE GE I ( 6E E 6[ 6E 6E GE 6EFEET NO 90 so 60 64 10 32 20 20 16 12 10 0 S 4 0...... 0 ............. ! ........................... 0 ...................... ....................................................000000000

o NO CEIL 1 26.6 27.3 24.7 29.3 30.0 30.3 30.1 30.4 30.4 30.1 30.4 3001 30.10., 30.S

GS 200001 1300 33.6 35.9 36.9 37.7 38.6 38.6 386.6 36.b 3s.6 36.6 38.6 38.6 36.6 38.7o: i1:t@:1 33.0 33.8 6 S.9 36.9 37.7 38. 6 3.6 38.6 38.6 3 S.6 38 6 3 ia6 38.6 3 .7

E 13000 13.0 33.6 3S.9 36.9 37.7 386. 38.6 36.6 36.6 38.6 38.6 36.6 31.6 38.6 36.76 160001 33.0 33.6 35.9 37.0 37*8 38.S 36.7 36.7 30.7 30.7 36.7 380. 38.7 38.7 386.

C 6E t 2000, 33.6 34.9 37.0 34.1 36*9 39.6 39. 39.6 39.6 39.6 39.6 39.6 39.6 39.6 39.9

GC 10000 37:S 36.9 1.2 62.3 63.1 63.7 66.0 6l.0 66.0 61.0 6.0 610 41.0 6.0 66.1o GE 90001 37.7 39.1 61.6 62. 633 66.1 66.6 4.51 %%.S 66.S 66.S 665 66. 5 61.S 66.6of 80901 126 6.0 66.3 67.6 66.2 69.3 69.7 69.6 69.6 9.6 69.6 69.6s 69.6 19.8 69.9SC 700 62.7 66.3 66.7 67.6 66.7 69.6 SO.1 SO.2 SO;2 SO.2 50.2 SO.? SO.2 53.2 50.3

o 6C 60001 63.2 66.7 67.1 6s.5 49.3 50 0 .il 6 5.9 SO50.9 50.9 50.9 50.9 10.9 10.9 S1.0

C SO00l 67.3 66.9 S11 S2.9 S307 S4.6 S5.2 S5.3 S5.3 S.3 5.3 51.3 SS. SS.3 55.6Q &E 6SOO 69.6 5l.z S3.7 S5.2 56.0 S7.3 S7.6 ST.7 S7.1 57.7 577 S7.7 S7.7 $7.7 57.6

SE 6001 55.9 17.7 60.5 62.0 62.9 6.3 66.6 66.9 66.9 66.9 66.9 66.9 66.9 66.9 65.1

GE 3501 61.6 63.6 66.3 67.7 64;6 70.0 70.3 70.7 70.7 70.7 70.7 70.7 70.7 70.7 70a.GE 30001 10.7 712.7 75.9 T. 7962 79.6 60.1 60.6 60.6 80.1 60.6 60.4 60.61 C3.4 80.5

It 2SOO 13.7 73.0 79.0 60.6 63.3 62.9 63.2 63.5 63.S 63.S 63.S 83.5 oi.S 63.5 63.6S 20001 76.2 716. 82.0 83.6 61.3 IS. 66.2 96.s 66.S 66.S 66.S 66.5 66.5 66.S 66.6C local 6.8 19.1 62.6 0.1 $6.91 66.4 66.9 67.3 67.3 67.3 67.3 67.3 67.3 67.3 67.6K I5001 19.6 61.9 6507 7.3 31, 69.6 90.2 90.S 90.S 9 . 90.5 90.S 90.5 90.S 90.761 &?ocl 60.7 63.2 67.3 69.1 90.0 91.6 92.1 92.6 92.6 92.6 92.6 92.6 92.1 92.1 92.S

st 10001 63.3 63.0 6.4 90.3 91.3 93.2 937 96.1 916.2 96.2 96.2 96.2 96.2 96.2 96.3Sf9001 6S 66.1 6.0a 91.0 92.1 9.10 91.6 9S.1 9S.2 91.2 9S.2 9S.2 9S.2 91.2 9S.3SE 6001 61.9 66.6 69.1 91.6 92.5 96.5 9S.2 95.6 9S. 95.7 95.7 95.7 9s.? S.7 9S.668 7001 02.2 66.7 90.0 92.3 93. 95.6 96.6 96.8 97.0 97.0 97.0 97.0 97.0 97.0 97.1at 6001 62.3 64.8 90.3 92.6 93.6 96.2 97.0 97.s 97.7 97.7 971 .7 97.7 1 7 97.6

66 5001 82.3 66.6 90.6 93.2 96.6 96.7 97.? 96.6 96.1 96.7 9..7 96.7 96. 96.7 96.6o I 1601 62.3 66.9 91.0 93.6 96.6 96.9 96.1 96.9 99.S 99.5 99.S 99.5 99.5 99.6 99.7

SC 3001 62.3 60.9 91.0 93.6 96.6 96.9 96.1 96.9 99.6 99.6 99.6 99.6 99.6 99.7 99.666 2001 62.3 66.9 91.0 93.6 96.6 96.9 96.1 96.9 99.7 99.7 99.7 99.6 99.6 99.9 100.0

SSC 101 62.3 01o9 91.0 93.6 96.6 96.9 96.1 91.9 9901 9907 99.7 99.6 99.6 99.9 100.0

if 0| 62.3 66.9 91.0 93.6 96.6 96.9 96.1 96.9 99.7 99.7 99.7 99.6 99.6 99.9 100.0

......... ..........................................................................

T6TAL w US Of 0(10117101: 910

,.L.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FRO" POURLY OBSERVATIONSAI WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAE: RAF ALCONRURY UNITED KINGDOM PERIOD OF RECORD: 78-67MONTH: AUG HOURSILSTI: 1200-1400

..........0....................... ............................... o.............. o..............CEILING VISIBILITY IN HUNDREDS OF METERS

JIe 6 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEO FEET 160 90 s0 60 N8 N0 32 29 20 16 12 10 6 5 N 0

......................................................... ?...........

o NO CEIL 23.0 29.e 2S.4 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0

GE 200001 30.6 32.S 3901 34.7 340? 3K.7 34.7 31.7 3K.7 3K.7 34.7 31.T 34.7 39.7 34.?o *i 140001 31.0 32.8 3.0. 35.1 3561 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35.1 35ol 35.1SE 160001 31.1 32.9 34.S 3S.Z 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2SE 1%0001 31.4 33.2 34.6 35.5 35.S 35.5 35.5 35.5 35.5 35.5 35.5 35.5 35.5 35. 35.5GE 120001 32.S 3N.3 35.9 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6 36.6

6E 10C00 34.9 37.0 36.6 39.2 39.2 39.2 39.2 39.2 39.2 39.2 39.2 39.2 39.2 39.2 39.2G 90001 3SeS 37.5 39.1 39.9 39.'9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9 39.9st 8000 0.0 92.9 99.2 99 99,9 N9o9 99.9 99.9 9.9 KN.9 49.9 4.9 44.9 99.9 44.9GE 70001 91.1 3.4 95.3 6.0 NO.0 N6.0 :6.1 N6.1 96.1 96.1 96.1 N6.1 96.1 46.1 96.1SE 60001 1.2 93.1 4S.1 N6.1 46.1 N6.1 N6.2 96.2 N6.2 N6.2 N6.2 N6.2 96.2 96.2 46O.2

:t 5001 46.0 49.1 51.3 52.0 52;0 52.0 52.2 S2.2 52.2 52.2 52.2 52.2 52.2 52.2 52.2SE 9Sao0 50. 53.1 S5.94 16."1S6;I 56.1 56.2 56.2 56.2 56.? 56.2 56.2 56.2 56.2 56.2SE 16000 60.1 62.6 640 65.? 65;7 65.7 65.86 65.5 65.9 65.9 65.9 65.9 65.9 65.9 65.9GE 35001 70.1 72.9 7s. 76.2 76.2 76.3 76.5 76.5 76.6 76.6 76.6 76.6 76.6 76.6 76.6GE 3000 61.2 69.1 06.6 67.7 67;7 66.0 66.2 66.2 66.3 866. S66.9 66. 86.9 88.9 680

GE 25001 63.1 66.0 66.7 69.7 89.7 89.9 90.1 90.1 90.2 90.3 90.3 90.3 90.3 90.3 9C.3-. G( 20001 65.2 66.1 91.9 92.1 92.5 92.6 93.0 93.0 93.1 93.2 93.2 93.2 93.2 93.2 93.2

GE 18001 65.3 66.2 91.S 92.6 92.6 92.9 93.1 93.1 93.2 93.3 93.j 93.3 93.3 93.3 93.3S IS00I 67.0 69.9 93.7 99.8 99.; 95.3 95.5 95.5 95.6 95.7 95.7 95.7 95.7 95.7 95.7GE 12001 86.4 91.4 95.2 96.S 96.6 97.1 97.3 97.3 97.9 97.5 97.5 97.5 97.5 9?.5 97.5

ro 10001 60.7 91.7 955. 96.6 97.1 97.6 96.0 96.0 96.1 99.2 98.2 982 96.2 90.2 98.2KS 9601 IS.? 91.6 95.6 96.9 97.2 97.7 98.1 96.1 98.2 98.3 96.3 96.3 98.3 98.3 96.3SE 6001 66.7 91.9 95.7 97.0 97.9 98.1 94.6 96.6 98;7 96.8 96.8 96.6 96.8 99.6 98.661 7001 96.7 91.9 95.6 97.1 97.5 90.2 96.7 96.? 96.8 90.9 96.9 96.9 96.9 96.9 96.96E 6001 so.? 91.9 95.6 97.1 96.0 98.6 99.2 99.2 99.9 99.5 99.5 99.5 99.5 99.5 99.5

ec 5002 66.f 92.2 9600 97.7 96.2 96.6 99.5 99.5 99.6 997 99.7 99.7 99.7 99.7 99.70 66 9001 66.6 92.2 96.0 97.7 96.2 96.9 99.7 99.7 ,99.9 1000 100.0 1000 100.0 10o0 1000SE 3001 66.6 92.2 960 97.7 96.2 96.9 99.7 99.7 99.9 100.0 100.0 100.0 100.0 103.0 100.0

B6 2001 64.a 92.2 96.0 97.7 96.2 98.9 99.7 99.? 99.9 100.0 100.0 100.0 103.0 100.0 100.0G6 1001 "8.6 92.2 96.0 97.7 96.2 98.9 99.7 99.7 99.9 100.0 100.0 100.0 100.0 100.0 100.0

BE 05 66.6 92.2 96.0 9?.? 96.2 96.9 99.7 99.7 99.9 100.0 100.0 100.0 100.0 100.0 100.0............... ...........................................................

1T1L NNSME OF 6SNVATI0NSs 930

1H

GLOBAL CLINITOLO6V BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYU Arr iFROM HOURLY O8SERVATIONSAIR OWTNER SERVICEfS*C

STATION NUNIE: 03S623 STAIION tARE: RAF ALCOmBU:: UNITED KINGOM PERIOD Of RECORO: 76-67M"OT#4: 1UG kDOSILSTI: 150 +e-17aa

CEILING VISIBILITY IN HUNDREDS 0IN IS SE S[ GE GE GE SE SE BE SE GE 6E BE GE GE 6E

1FE 1 140 90 0s 60 _ 0 32 24 20 16 12 10

NO CEIL 1 27. 2.6 2907 30.1 30.1 30. soo 3 0.1 30.1 30.1 30.1 30.1 32.1 30.1

SE 200001 33.7 39.9 16.2 36.4 36.4 36.6 36 6 366 346 36.6 36.6 36.6 36.6 $6.4 346B I 10001 33.9 3S.1 36.S 36.4 34; 36. 34.8 34.8 34.8 36.8 34.8 34.8 34.8 36.6 36 6SE 140001 33.9 3S.1 36.S 36.6 34; 34.6 34.6 34.8 3 .6 36.8 3.6 34.S 36 36 34.6BE 140001 36.0 3S.2 34.4 56.9 3409 36.9 36.9 34.9 36.9 36.9 34.9 369 369 36.9 36.9CE 12COOl 3S.6s 36.6 37.9 38.2 362 ; S2 ? 36.2 36.2 36? 36 36.2 35.2 36.2 3.2 36.2

SE 10000l 3.7 60.9 42.3 12.7 62.7 12.7 12.7 12.7 42.7 62.7 62.7 42.7 12.0 %2.7 12.7BE 90001 60.1 13.3 62.9 63.3 A3.3 1 3.3 63.3 63.3 63.3 63.3 13.3 13.3 63.3 63.3 63.3St 60001 66.9 64 R6. 66.s 606 19.4 6o4.6 6.4 66.6 864 0.4 66.6 68.6 68.6 l66BE 10001 4S.9 67.6 9.0 69.1 69.6 69.6 906 69.6 69.6 9.6 69.4 19.6 69.6 9.4 19.4SE 40001 46.0 67. 69.1 69.4 649. 69.7 19.7 69.7 69.7 69.7 69.7 %9.7 69.t 6907 69.7

G Scoot 50.6 S2.3 S6.1 S4.9 11.2 S1.2 S1.2 S1.2 SS.2 S.2 11.2 11.2 SS.2 1.2 15.2S % 6100 51.0 S68 40.9 61. 62. 62.1 62.3 62.1 62.1 6Z.1 42.1 62.1 42.1 62.1 62.1IE 60001 49.1 71.3 73.6 76.? 7S.0 7S.2 71.2 15.6 ?S.6 ?s. ?S. 7S.1 7s. 7s.61 71.661S 3S0 6.6 60.7 63.4 64.6 809 65.2 8S.2 8S.3 S;3 6S.3 4S.3 65.3 1.3 61.3 61.3BE 30001 63.3 6S. O8.6 69.? 90.1 90.S 90.6 90.? 90.7 90.7 90.7 90.7 9007 90.7 9007

SC 2Slw1 41.3 67.6 90.6 91.7 92.0 92. 92.6 92.7 92.7 92.7 920 92.7 92.1 92.7 92.761 21 "69 69.3 999% 93.8 96. 917 96.6 96.9 96.9 96.9 96.9 96.9 96.9 96.9 94.96E 16001 0'/.l 69.1 93.1 96.3| 96o4 96.3 91.2 91.6 91.6 91.6s 91.6 9$1 91.6 95.6l 91.6

SC IS0 Bl.6 90.8 9.7 9. 961 97.0 91.1 97.2 97.2 97.2 97.2 97.2 9.2 97.2 9?.2BE 12001 69.2 91.6 91. 97.0 97.1 96.1 95.2 96.3 96.3 90.3 96.3 98.3 91.3 96.3 96.3

SE 10001 69.2 91.6 91 7.1 97? 96.3 964 96.7 96.6 96.6 96.6 96. 96.6 96.6 96.6BE S 9001 9o. 91.6 9S. 97.2 97.6 96.S 91.7 96.6 96.9 96.9 96.9 96.9 96.9 95.9 96.9SE 6UOI 09.2 91.8 9. 4 97.6 96.2 91.9 99.1 99.2 99.3 99.3 99.3 99.3 99.3 99.3 99.3Se ?GOl 09.2 91.4 96.2 97,7 98.3 99.0 99.2 99.3 99.6 99.6 99.6 99.% 99.6 99.6 99.6oE 4001 09.3 91e9 94.6 97.9 96.7 99.6 99.7 99.6 99.9 99.9 99.9 99.9 99.9 99.9 99.9

E o001 69.3 91.9 94.S ", 0 96.6 99.6 99.8 99.9 .J0.0 100.0 100.0 100.0 100.0 300.0 100.0e 9005 69.3 91.9 96.1 9010 98.8 99.4 99.6 99.9 100.0 100.0 100.0 100.0 i00.0 10o0 100.0

$ o00 69.3 93.9 96.1 96.0 98.8 99.6 99.6 99.9 100.0 10000 1000 30 100.0 100.0 100.0at 2001 09.3 91.9 9.5 91.0 99.4 99.6 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0

61 1001 69.3 91.9 96.S1 9.0 96.6 99.6 99.8 99.9 i0.0 100.0 100.0 300.0 100.0 100.0 100.0

BE 05 09.3 91.9 V4.S 9.0 96.0 99.6 99.6 99.9 100.0 100.0 100.0 100.0 100.0 100.0 100.0..... ... ....l... ........ ,.. ......................................... .........

1OTL Nupol Of OBSERVIONS$ 90s

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUS AETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEMAC

STATION NUNI 035623 STATION NAME: RAF ALCOIBURT UNITED KINGDON PERIOD OF RECORD: 78-67MONTh: AUG HOURSILSTI: 18007200

... . .. . .. .. .. .. . .. .. . .............. .................................... ; L *l 4JO [S"; ;lS ...................... ........

CE ILING VISIBILITY IN HNDREDS Of PETERSIN 551 GE SC 6E 6E GE GE GC GE GE SE GE GE GE GE GE

FEET I 160 90 0 60 %6 'a0 32 2'1 20 16 12 10 a 5 6 0

o O CElL 1 28.2 30.3 32.S 32.8 32.9 33.2 33.2 33.3 33. 53. 33. 33.41 33.. 33. 33..

GE 200001 35.6 36.2 '.. '1.7 '1.9 o.2: '2.1 62.2 42 '2. '2.. 42.' '2.'. 62.6 42.o 180001 36.3 36? 61.9 '2.2 21'. '2.6 ' 2.6 '2.7 2.9 2 2.9 62.9 .29 .2.9 .2.9 42.9GE 160001 36.3 36.7 41.9 62.2 42.4 42.6 62.6 62.7 62.9 62.9 '12.9 12.'9 62.9 42.9 '2.9SE 190001 36.3 36.7 41.9 42.2 42.4 62.6 42.6 62.7 42.9 62.9 62.9 '2.9 '2.9 '2.9 1#2.9SE 120001 38.2 60.7 63.9 66.3 1.6 1..6 61.6 6 8.6 66.9 '.6.9 66.9 '.6. '.9 '.6.9 4.9

SE 100001 61.1 63.6 67.0 17.5 67.7 67.9 67.9 68.0 6.2 902 6.2 6.2 '8.2 96.2 '.8.2

o 9000 61.7 '.0.3 97.7 96.2 0.3 66.5 66.5 60.7 '8.8 '..6 68.8 '.. '.. 66.8 68.86E 60.01 67.6 50.6 S6.2 ss.0 S5% . .% S5.4 55. 5.5 55.6 55.6 SS.6 55.6 55.6 55.6 55.6BE 70001 6.'. S1.3 SS.1 5S.9 S6.0 S6.2 S6.2 56.' 56.5 56.5 56.5 56.5 56.5 56.5 56.58e 40001 '.9.7 S2.6 56.' S7.1 S7.3 57.5 57.5 57.6 57.6 57.6 S7.6 57. 57.6 57.6 57.8

SE So0oi S%.2 S.. 61.3 62.3 62.6 62.9 62.9 63.1 63.2 63.2 63.2 63.2 63.2 63.2 63.26E S5Ul 60.2 63.' 67.5 66.6 66.7 69.2 69.2 49.'1 69.5 69.5 69.5 69.5 69.5 69.5 69.5E 40001 69.9 73.1 77.9 79.3 79. 60.1 80.2 00.6 S0.7 60.7 60.7 00.7 60.7 60.7 60.7

SE 3S001 6 A.9 78.6 63.6 65.2 65.6 86.0 66.1 46.S 66.6 66.6 86.6 66.6 66.6 86.6 86.6B 1 30009 76.7 83.1 66.6 90.8 90.9 91.6 91.8 92.2 92.6 92.6 92.6 92.6 92.6 92.6 92.6

61 25001 1.3 63.9 89.5 91.7 91.6 92.'. 92.7 93.1 '3.6 93.6 93.6 93.6 93.6 93.6 93.6o SE 20001 60.7 8.2 91.0 93.2 93.3 93.9 96.2 96.6 95.1 95.1 95.1 95.1 95.1 95.1 95.1SE 1o0t m0.$ 65S 91.3 93.' 93.6 96.2 9%.S 96.6 95.3 95.3 95.3 95..3 95.3 95.3 95.3St lSiaI 61.1 65. 92.1 96.6 9'*.7 9S.3 9S.6 96.0 96.5 96.5 96.5 96.5 96.5 96.5 96.5

CS 12005 6 66.' 92.6 9S.3 9S.5 96.1 96.3 96.7 97.2 97.2 97.2 97.2 97.2 97.2 97.2

SE 10001 62.2 67.1 93.6 96.1 96.2 96.8 97.1 97.5 96.2 98.2 96.2 98.2 96.2 98.2 96.2. SE 9001 62.2 87.3 93.7 96.2 96.3 97.0 97.2 97.6 96.' 96.' 96.' 96.6 96.' 98.6 96.6

iE soul 92.2 67.6 96.2 96.7 97.1 97.1 96.0 96.' 99.1 99.1 99.1 99.1 99.1 99.1 99.1SE 7001 62.5 66.0 96.5 97.1 91.5 96.1 96.6 96.7 99.s 99.5 99.5 99.S 99.5 99.5 99.5E 6 0 0 5 6 2 . 5 6 6 0 9 S 9 7 1 9 7 5 9 6 . 9 6 . 6 9 6 7 9 9 5 9 9 . 5 9 9 . S 9 9 5 9 9 . 5 9 9 .5 9 9 . 5

St soul 02.S 66.0 96.6 97.2 97.6 90. 96.6 99.0 99.7 99.7 99.7 99.7 99.7 99.7 99.7SE 41,0i 92.S 88.0 96.6 97.' 97.7 96.S 98.9 99.2 100.0 100.0 100.0 100.0 100.0 100.0 100.0GS 3001 62.5 66.0 96.6 97. 97.7 96.5 98.9 99.2 1[.0 200.0 100.0 100.0 100.0 100.0 100.0K 2001 02.5 66.a 96.6 97.' 97.7 98.5 98.9 99.2 100.0 100.0 100.0 100.0 100.0 100.0 100.0

lo 1009 62.5 98.0 96.6 97.. 97.7 96.S 96.9 99.2 110.0 100.0 100.0 100.0 100.0 100.0 100.0

S 0, 62.S 6.0 96.6 97. 97.7 96.5 96.9 99.2 100.0 100.0 100.0 100.0 100.0 100.0 100.0

................... . .......

TIAL NUMBER Of OBSERVATIONS 1 793

GLOBAL CLINATOLO6V BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYuSAFETAC FROM IOUiRLY OBSERVATIONSAIR MEATHER' SErlVICE/1ficd

S./ATION NUMBErRS 0323 STATION NAME: :AF ALCOBURV UNITEO KINGOM PERIo OF RECORD: 76-6E

MON./Ht AUG HOURSILS,/I: 2100-230

CEILING VISIBILITY/ IN 04UNOREOS OF METERSIN I67 6E 6E 6E GE 6E 6E 6E GE 6E iE GE GE GE G-E 6E

0 FEET I 16C 90 so 60 98 90 32 24 20 16 12 to a S 4 0

0 NO CEIL I 38.0 38.6 3.7 55.7 55.1 55.7 56.0 46.0 46.0 56.0 16.0 56.0 56.0 56.0 56.0

SE 200005 53.1 556 $0.1 51.2 51.7 52.2 52.5 52.5 S2.5 52.5 S2.5 52.5 52.5 52.S 52.SGE 180001 53.3 15.7 S0.2 51.4 518 $2.9 S2.7 52.7 527 52.7 S2.7 520.7 2.7 12.7 52.7GE 160001 53.3 f.? 10.2 Sl.0 S1. 52.5 52.7 52.7 12.7 52.7 S2.7 52.7 S2.7 12.7 12.76E 190001 43.3 55.7 10.2 11.5 51.8 52.4 52.7 52.7 S2.7 52.7 S2.7 52.7 52.7 52.7 12.7

0 SE 120001 93.6 55.3 50.8 52.0 52.4 13.0 53.3 53.3 13.3 13.3 53.3 13.3 S3.3 53.3 13.3

SE 10000, 56.0 7. 53.1 5.6 55.0 55.6 5.9 SS.9 51.9 5.9 SS.9 S1.9 55.9 11.9 55.9o SE 90001 56.3 57.6 53. F .9 S.'3 51.9 56.2 56.2 16.2 56.2 56.2 S6.2 56.2 56.2 Sb.2GE 50001 59.5 50.9 5S.6 58.2 .;6 59.2 59.7 S9.7 59.7 59.7 59.7 59.7 59.7 59.7 59.7SE 70001 5.5: 51. 57.5 59.1 S9.5 60.1 60.S 60:S 60.5 69. 60.S 60.5 6.. 60.5 60.5

0 GE 60001 51.1 52.5 56.2 59.6 60.z 60.8 61.2 61.2 61.2 61.2 61.2 61.2 61.2 61.2 61.2.

SE 10001 iS.0 5696 62.8 65.7 6S 12 66.2 66.6 66.6 66.6 66.6 66.6 66.6 66.6 66.6 66.60 GE 55001 59.2 61.0 67.3 69.2 69.7 70.7 71.1 71.1 71.1 71.1 71.1 71.1 71.1 71.1 71.1

GE 40001 67.6 69.5 76.9 78.8 79.2 60.3 80.7 60.7 60.7 o.,7

60.7 80.7 60.7 80.7 80.7GE 3Soul 71.0 73.5 61.0 83.3 83.7 8.8 65.2 85.2 0.2 8.2 8.2 85.2 81.2 8.2 61.2o GE 30001 75.0 76.6 65.6 66.9 67.5a 86. 88.8 86.8 88.8 5.6 66.6 668. 68.6 68.8 88.8

GE 2100i 75.0 77.9 81.6 66.1 8.S 89.6 90.0 90.0 90.3 90.3 90.3 90.3 90.3 9f.3 90.3o GE 20015 76.1 79.5 66.0 90.5 90..9 92.0 92.5 92.5 92.7 92.7 92.7 92.7 92.7 92.7 92.7GE 16001 76.3 79.6 86.2 90.7 91.1 92.3 92.7 92.7 93.0 93.0 93.0 93.0 93.0 93.0 93.0SE IS001 77.1 80.6 89.3 91.9 92.3 93.5 93.9 93.9 95.2 95.2 95.2 99.2 95.2 902 94.2

E GE 12001 77.5 61.0 90.0 93.0 93.5 95.6 95.1 95.1 9.5. 9.51 95.5 95.4 95.5 95.5 9SS

6E 10001 76.5 62.3 91.3 95.3 95.8 9S.9 96.5 96.9 97.1 97.1 97.1 97.1 97.2 97.2 97.27 SE 9005 .5 82.5 91.5 95.5 95.1 96.2 96.7 96.7 97. 97.5 97.5 97.5 97.5 97.1 97.5

E 6001 76.7 83.0 92.S 9S.5 96.2 97.5 97.6 97.6 985 96.1 96.5 98,.5 96.7 9., 98.GE 7001 79.0 63.3 92.7 95.8 96.S 97.7 96.1 981 98,. 95.6 96.8 96.8 99.0 99.0 99.0SEt 6005 79.0 63.5 93.0 96.1 96.8 98.0 98.5 98.5 99.1 99.1 99.1 99.1 99.3 99.3 99.3

GE 5001 79.0 83.5 93.5 96.7 97.5 9805 99.0 99.0 99.7 99.7 99.7 99.7 99.9 99.9 99.9GE 'l001 79.0 83.S 93.6 96.6 97.5 98.7 99.1 99.1 99.9 99.9 99.9 99.9 100.0 1030.0 100.0SE 3001 79.0 83.5 93.6 96.6 97.5 98.7 99.1 99.1 99.9 99.9 99.9 99.9 100.0 10o.0 100.0BE 2001 79.0 83.5 93.6 96.6 97.5 90.7 99.1 99.1 99.9 99.9 99.9 99.9 100.0 100.0 100.0SE 1001 79.0 83.5 93.6 96.8 97.S 98.7 99.1 99.1 99.9 99.9 99.9 99.9 100.0 100.0 100.0

6E 01 79.0 63.5 93.6 96.8 97.s 98.7 99.1 99.1 99.9 99.9 99.9 99.9 100.0 10 C.0 100.0

...................................................................................................... ...........................

TOTAL NUMBER OF OBSRV46TIONSs 689

. .M S

d21II~mlr

q!

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYtSAFETAC FROM HOURLY OBSERVAIIONSAIR WEAT14ER SERVICEf/AC

STATION NUMBER: 035623 STATION NAME: RAF ALCO1IURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: AUG HOURSILSTI: ALL

CEILING VISIBILITY IN HUNDREDS OF METERSIN a1 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET J 160 90 60 60 6 10 32 2. 20 16 12 10 a S 16 0........ ...... ............ ................................................................... o...............................

C NO CEIL I 28.5 29.9 32.2 33.0 33.4 39.0 3 1.1 301.6 34.8 39.9 34.9 34.9 39.9 35.0 35.1

GE 200001 31.0 35.7 38.5 39.5 10.0 40.7 41.2 41. 11.6 11.6 41.7 41.7 11.8 41.9 42.0oGE 18000 314.2 35.9 36.7 39.7 460.2 910.9 161.4 41.6 11.8 41.9 11.9 11.9 12.0 42.1 12.2GE 160001 34.2 35.9 38.7 39.6 40.2 10.9 61.1 11.6 41.8 41.9 11.9 42.0 4Z.0 42.1 12.2GE 190001 31.3 36.0 3B.8 39.9 160.3 41.0 11.5 11.7 42.0 12.0 12.1 12.1 42.1 12.2 2.4GE 120001 3S.4 37.1 0.0 11.0 11.5 12.2 12.7 42.9 43.1 143.2 13.2 43.3 13.3 46. 13.5

GE 100001 38.1 160.0 13.1 41.3 11.6 45.5 16.0 16.3 16.6 46.6 16.7 46.7 16.8 46.9 47.0GE 9COl 36.6 1O.S 13.7 11.9 95:5 16.2 16.7 17.0 417.3 47. 467.1 17.5 47.5 17.6 17.76E 6C00 13.2 :5.3 6.7 50.1 507 51.5 52.1 52.1 52.9 52.9 52.9 53.0 53.1 53.1 533GE 7nool 13.9 16.1 49.S S0.9 51.5 S2.3 52.9 53.2 53.7 53.7 53.8 53.8 53.9 51.0 54.1

C GE 60001 1.3 46.S 19.9 51.6 52;0 52.8 53.1 S3.7 54.2 54.2 516.3 513 54. 51.5 51.6

GE SOuOl 48163 50.6 S1.1 56.0 56,6 57.5 58.1 58.5 59.0 59.0 59.1 59.1 59.2 59.3 59.4U GE sooi 52.S 569 58.9 60.6 61.2 62.2 62.8 63.1 63.6 63.6 63.7 6307 63.8 63.9 64.1

GE 10005 60.0 62.6 67.1 66.9 69.5 70.6 71.3 71.7 72.3 72.3 72.1 72. 72.5 72.6 72.7GE 35 01 65.3 66.1 72.9 79.9 75.5 76.7 77.3 77.8 78.41 76. 78.4 78.5 78.6 78.7 78.6o GE 30001 70.S 73.6 78.6 60.6 81.1 62.7 83.4 63.6 816,1 61.o5 84.6 8.6 8.7 81.8 85.0

GE 25001 72.5 75.6 60.6 83.0 83.6 81.6 85.5 86.0 86.7 66.7 66.6 86. 86.9 87.0 87.2GE 20001 7905 77.9 83.1 85.7 86.3 87.6 88.3 86.8 89.5 89.5 89.6 89.6 89.7 89.8 90.0GE 1800 768 76.1 63.6 8S.9 866 87.9 88.6 69.1 89;7 69.6 89.6 89.9 90.0 93.1 90.2GE 15001 76.2 79.6 8S.S 86.1 88.6 90.1 90.9 91. 92.0 97.1 92.1 92.2 92.3 92. 92.5GE 12001 77.2 60.7 66.7 $9.S 903 91.7 92.S 93.0 93.6 93.7 93.7 93.8 93.9 91.0 94.2

GE 10001 77.7 61.3 87.5 90. 91.2 92.7 93. 94.0 91.7 916.8 91.8 916.9 95.0 95.1 95.2GE 9001 77.9 61.5 67.8 90.8 91.6 93.1 93.9 96.5 95.2 95.3 95.3 95. 95.5 95.6 95.8GE 8005 77.9 61.7 8.2 91.2 92.1 93.7 910.5 95.1 95.9 95.9 96.0 96.0 96.2 96.3 96.6GE 7001 78.1 62.0 86.6 91.7 92.6 916.2 95.2 95.7 96.5 96.6 96.6 96.7 96.8 96.9 97.0

C GE 6001 7.2 62.1 88.9 92.0 93. 0 91.7 9S.6 96.2 97.0 97.1 97.2 97.2 97.3 97.1 97.6

GE 1005 78.3 62.3 89.3 92.6 93.6 95.3 96.3 97.0 97.6 97.8 97.9 98.0 98.1 98.2 98.4GE 4001 78.3 82.3 69.. 92.8 93.6 95.6 96.7 97.3 90.2 96.3 98.3 96. 98.5 98.7 98.9GE 3001 76.3 62.3 89.1 92.8 93.9 95.6 96.0 97.5 98.' 9.S 96.6 98.7 96.9 99.0 99.3GE 2001 78.3 62.3 69. 92.8 93.9 95.6 96.6 97.5 96.5 98.6 96.8 98.9 99.2 99.3 99.8GE 1001 76.3 62.3 69.'. 92.6 93.9 9S.6 96.8 97.S 98.S 98.6 98. 99.0 99.2 99.1 100.0

GE 01 6.3 62.3 69.1 92.6 93.9 95.6 96.6 97.5 96.5 98.6 96.6 99.0 99.2 991 1000

..........................................................................................................................................

TOTAL NUMBER OF OBSERVATIONSt 6501

Lnn UL

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYLSAFETAC FROM 11OURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: SEP HOURSILSTI: O00-02CO

..................................~~ o .. . . . . .. .. . . . . . . . . .. . . ....... .. ... .. ..

CEILING VISIBILITY IN 14VNDREDS OF METERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0K NO CEIL ? 7.5 39.0 42.1 43.5 44.4 45.5 46.4 47.4 47.7 47.9 47.9 48.1 48.3 48.3 48.3

GE ZOOo 42.1 43.5 47.0 49.4 50.3 51 .4 52.3 S3.2 53.6 53.7 53.7 53.9 5%.1 54.1 S4.1GE I80U01 42.1 43.5 47.0 49.4 50.3 51.4 52.3 53.2 53.6 53.7 S3.7 53.9 54.1 54.1 54.1GE 160001 42.1 43.5 47.0 49.4 5C. 3 51.4 52.3 53.2 53.6 53.7 53.7 53.9 S4.1 54.1 54.1GE 140aO 42.3 43.7 47.2 49.5 50.5 51.5 52.5 53.4 53.7 53.9 53.9 54.1 54.3 54.3 5..3

C GE 120001 43.2 45.0 46.5 50.8 51.7 S2.8 53.7 54.6 55.0 55.2 55.2 SS.4 55.6 5S.6 55.6

GE 100001 45.2 47.7 51.7 54.1 55.0 56.1 57.0 57.9 58.3 58.5 58.5 5.7 58.8 58.8 58.8GE 9001 45.7 48.3 52.3 54.6 55.6 56.6 57.6 58.5 58.8 59.0 59.0 59.2 59.4 59.4 59.4GE 80001 49.0 51.7 55.7 58.1 59.0 60.1 61.0 61.9 62.3 62.S 62.5 62.7 62.8 62.8 62.8GE 7000o 49.4 52.1 56.1 58.5 59.4 60.5 61.4 62.3 62.7 62.8 62.8 63.3 63.2 63.2 63.2GE 60001 49.4 52.1 56.1 58.5 59.4 6oS 61.4 62.3 62.7 62.8 62.8 63.0 63.2 63.2 63.2

GE 5000 52.:8 55:9 S9.9 62.5 63.4 65:0 65.9 66.8 67.2 67.4 67.4 67.6 67.8 67.8 67.8GE 45009 55.6 58.8 63.0 65.6 66.7 68.3 69.2 70.1 70.5 70.7 70.7 70.9 71.0 71.0 71.0GE 40U09 61.6 65.0 69.8 72.5 74.0 75.6 76.5 77.4 77.8 78.0 78.0 78.1 78.3 78.3 78.3GE 35001 64.3 67.8 72.5 75.2 76.9 78.5 79.4 80.3 80.7 80.9 80.9 81.1 81.2 81.2 81.2GE 3C001 67.6 71.4 76.1 78.9 60.5 82.1 83.1 84.0 84.3 84.5 84.5 84.7 84.9 84.9 84.9

GE 25001 69.6 73.4 78.1 81.2 82.9 84.9 65.8 86.7 87.1 87.2 87.2 87.4 87.6 87.6 87.6GE 20001 69.8 74.0 78.7 82.1 84.0 86.5 57.4 88.3 88.7 88.9 88.9 89.1 89.3 89.3 89.3GE 18001 69.8 74.0 76.7 82.1 84.0 86.5 87.4 88.3 88.7 88.9 88.9 89.1 89.3 89.3 69.3Gc 15001 70.9 75.0 79.8 83.4 8S.2 87.8 88.7 89.6 90.0 90.2 90.2 903 90.5 90.5 90.5

0 GE 12001 72.7 77.0 81.8 8S.4 87.2 90.2 91.3 92.2 2.5 92.7 92.7 92.9 93.1 93.1 93.1

GE 1000 73.8 78.1 83.2 87.1 88.9 91.8 92.9 93.8 94.2 94.4 94.4 94.S 94.7 94.7 9e..7GE 9009 74.0 78.3 83.4 87.2 89.1 92.0 93.1 94.0 94.4 9%.S 94.5 94.7 9q4.9 94.9 94.9GE 80O1 74.5 78.9 84.0 87.8 89.6 92.5 94.0 9s.1 95.4 95.6 95.6 95.8 96.0 96.0 96.0GE 7009 74.7 79:1 84.3 88.3 90.2 93.1 94.5 95.6 96.4 96.s 96.5 96.7 96.9 96.9 96.9

GE 6o9 750 79.4 84.7 68.7 90.7 93.6 95.3 96.4 97.1 97.3 97.3 97.4 97.6 97.6 97.6

GE 5009 75.0 79.4 85.2 89.3 91.3 94.2 96.0 97.3 98.0 98.2 98.2 98.4 98.5 98.5 98.5GE 4001 75.0 79.6 85.6 89.6 91.6 94.5 96.4 97.6 98.S 98.7 98.7 98.9 99.1 99.1 99.1GE 3001 75.0 79.6 85.6 89.6 91.6 94.5 96.4 97.6 98.7 98.9 98.9 99.3 99.5 99.5 99.6GE 2001 75.0 79:6 86b, 89.6 91.6 94.5 96:4 97:6 98.7 98.9 98.9 99.5 99.0 99.8 100.0GE IU0 75.0 79.6 85.6 89.6 91.6 94.5 96.4 97.6 98.7 98.9 98.9 99.5 99.8 99.8 100.0

GE 0 75.0 79.6 85.6 89.6 91.6 94.s 96.4 97.6 98.7 98.9 98.9 99.5 99.8 99.8 100.0.........................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS t 949

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE O CEILING VERSUS VISIBILITYuSAFETAC FROM hIOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-S7MONTH: SEP HOURSCLSTI: 0300-0500

................. .................................. .. ....................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I GT E GE GE BE GE GE GE GE GE GE GE GE GE GE GEo FEET I 160 90 80 60 8 4t 32 2. 20 16 12 10 8 5 9 0

o NO CEIL 1 3.00 35.0 36.9 37.8 38. 8 '.0.8 4.2.6 '.2.7 '..0 41N.5 '.9.6 95.1 45.3 '.5.9 45.6

GE 200001 317.8 39.5 '1.9 N3.1 99.1 '.6.2 97.9 '.8.1 49.5 50.1 50.3 50.8 50.9 51.0 51.3o GE 180001 37.8 39.5 91.9 '13.1 44.1 96.2 97.9 '.8.1 19.5 50.1 50o3 50. 50.9 51.0 51.3GE 16000 37.B 39.5 1.9 '3.1 99.1 116.2 97.9 '18.1 q9.5 50.1 50.3 5O0.8 50.9 51.0 51.3GE 14000 37.8 39.5 41.9 43.1 4. .1 '.6.2 47.9 '.8.1 99.5 S0.1 50.3 50.8 50.9 51.0 51.3

O GE 120001 37.9 39.6 '.2.1 '13.2 49

#42 '.6.3 N8.1 .8.2 N9.6 50.3 SO. 50.9 51.0 51.2 S1.'.

GE 100001 '.0.9 '2.3 5.O0 16.3 '7.3 9.'. 51.2 51.'. 52.8 53.5 53.6 59.1 5'.2 5.'. 59.6C GE 9CO01 '.0.8 2".7 95.'. '.6.7 97.8 '.9.9 S1.7 51.9 53.3 59.0 59.1 5'.6 54.7 59.9 55.1

GE BOOJLI 99.2 '6.2 99.0 50.3 51.'. 53.6 55.'. 55.6 57.1 57.7 57.8 58.3 58.5 58.6 58.8GE 70001 '.7 '6.7 '.9.5 50.8 51.9 59.1 55.9 56.2 57.6 58.2 S8.3 58.8 59.0 19.1 59.'.

- GE 60001 N.7 '6.7 '.9.5 50.8 51.9 59.1 55.9 56.2 57.6 58.2 58.3 $8.8 59.0 59.1 59.9

GE 50001 97.6 99.7 53.2 59.7 55.9 58.5 60.3 60.6 62.1 62.7 62.8 63.3 63.5 63.6 63.8SGE 45001 50.4 S2.? 56.4 57.9 59;1 61.7 63.6 64.0 6S.4t

66.0 66.2 66.7 66.8 66.9 67.2

GE '.0001 56.5 59.1 63.1 69.6 65.9 68.6 70.6 71.2 72.6 73.3 73.5 79.0 79.1 79.2 791.5GE 35OI 59.6 62.'. 66.7 68.3 69.9 72.7 7'.7 75.3 76.'7 77.1 77.6 78.1 78.2 78.3 78.6GE 30001 61.8 69.9 69.6 71.'. 73.3 76.2 78.2 78.7 80.1 80.9 81.0 81.5 81.7 81.8 82.1

GE 25001 63.5 66.5 71.'. 73.3 75.3 78.3 80.9 80.9 82.3 83.1 83.2 83.7 83.8 89.0 89.2_. GE 20001 65.9 69.96 79.6 76.8 78.7 81.9 89.0 89.5 85.9 86.7 86.8 87.3 87.1 87.6 87.8

GE 18001 65.9 69.'. 79.6 76.8 78.7 81.9 89.0 '..5 85.9 86.7 86.8 87.3 87.9 87.6 87.8GE 15001 67.2 70.6 76.0 78.2 80.1 83.3 85. 85.9 873 88.1 88.2 8807 89.0 89.1 89.'.GE 12001 68.5 71.9 77.' 79.7 81.7 85.3 87.3 87.9 99.5 90.3 90.'. 90.9 91.2 91.3 91.5

GE 10001 70.5 79.0 79.5 81.8 83.7 87.3 89.5 90.3 91.8 92.6 92.7 93.2 93.5 91.6 93.8GE 9001 70.6 79.1 79.7 82.1 89.0 87.6 89.7 90.5 92.1 92.8 92.9 93.5 93.7 93.8 99.1GE 8001 71.' 79.9 80.6 82.9 84.9 88.5 90.6 91.' 92.9 93.7 93.8 99.1 99.6 99.7 95.0GE 71031 717 75.1 81.'. 83.7 85:6 89.2 91:9 92:2 93.7 9,45 99.6 95.1 95.'. 95:5 95.8GE 6001 717 75.1 81.9 83.7 85.6 89.2 91.9 92.9 99.5 95.9 9S.S 96.0 96.3 96.9 96.7

GE 5001 71.7 75.1 81.7 89.0 85.9 89.6 92.6 93.6 95.1 96.0 96.2 96.7 96.9 97.1 97.3r GE 91001 71.7 75.1 81.8 89.2 86.2 89.9 93.2 99.2 95.9 97.1 97.2 97.7 97.9 98.1 98.3

GE 3001 71.7 75.1 81.8 89.2 86.3 90.0 93.6 99.9 - 96.5 97.7 97.8 98.3 98.6 98.7 99.0GE 2001 71.7 75.1 81.8 8'.2 86.3 90.0 93.7 9S.0 96.7 97.9 98.1 98.6 98.8 99.0 99.2GE oo[ 71.7 75.1 81.8 89.2 86.3 90.0 93.8 95.1 96.8 98.1 98.2 98.8 99.1 99.2 99.7

GE a1 71.7 75.1 81.8 89.2 86.3 90.0 93.8 95.1 96.8 98.1 98.2 98.8 99.1 99.2 100.0

........................................................................................................ ...... ..........................

TOTAL NUMBER OF OaSERVATIONS: 780

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY Of OCCURRENCE OF CEILING VERSUS VISIBILITYUS AF ETaC FROM HOUQLY OBSERVATIONSAIR WEATHER SERVICEiMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD Or RECORD: 78-A?MO0N TH: SEP H0OUR S;LSTI: 0600-0600

.. . .. . . .. . .. . . . . . . .. .. . ... . . . . .. ... . ..... . . . .. . . . . .. .

C'

CE LING VISIBILITY IN HUNDREDS OF METERSUI N IGT GE GE GE G E GE GE GE GE GE GE GE GE GE GE GEo FEET IROO 90 80 60 9 8 90 Y2 29 20 16 12 10 a 5 0

oNo CEIL I 25.2 26.2 29.7 31.1 31.5 32.6 33.6 34.2 35.3 35.6 35.9 36.4 36.9 37.3 38.1

GIE 2000011 1.9 32.6 36.7 38.5 39.0 90.1 91:. 92.1 43:2 93:.9 99 99. 95.1 4 5.5 96.3o E 18GO0a 31.91 32.6 36.7 38.5 39.0 40.1 91.' 2.1 43.2 93. 9 3. 99. 51 95.5 96.3GE 160001 31.9 32.6 36.? 38.5 39. 0 90.1 941.9 92.1 83.2 93.9 493.9 94.4 45.1 45.S 96.3

G E 190001 31.5 32.8 36.6 38.6 39. 40.2 91.6 92.2 43.3 43.5 99.0 99.5 45.2 45.6 96.5C E 120G01 32.9 33.6 37.7 39.5 90.0 91.1 42.14 '3.0 99.1 99.9 99.9 9 5.4 96.1 96.5 947.3

GE 100001 35.5 36.8 91.0 93.2 93.6 99 .7 916.1 96.7 97.8 98.0 918.5 99.0 99.8 50.1 51.0GE 90901 36.3 37.7 91.8 99.3 499.9 96.0 47.3 47.9 99.1 49.4 99.9 50.9 51.1 S1.5 52.3

'GE 80001 91.0 92.3 46.8 99.'. SO.% 51.6 53.3 53.9 55.3 55.5 56.0 56.5 57.2 57.6 S8.GE 7001 92.2 9 3.6 98.2 50.7 51.7o S3.1 59.8 55.9 S6.7 57.0 57.5 57.9 se ? 59.0 59.9

C E 60(101 92.3 93.8 98.91 51.0 52.0 53.3 55.0 55.6 57.13 5?.2 5 7.7? 58.2 58.9 59.3 60.1

GE 5000l 99.7 96.6 51.5 54.4 55.6 57.2 59.0 59.8 61.2 61.5 62.0 62.5 63.2 63.6 69.9GE 45001 97.7 99.6 55.0 58.9 59.7 61.5 63.3 69.1 65.5 65.8 66.3 66.? 67.5 67.8 68.7GE 20001 51.7 53.8 59.7 63.2 69.5 66.7 66.8 69.6 71.0 71.3 71.8 72.2 73.1 73.5 79.3OGE 3009 59.2 56.9 62.5 66.1 67.5 69.7 71.8 72.S 79.0 73.2 79.7 75.2 76.0 76.9 77.3GE 30001 56.2 58.9 69.7 68.5 69.9 72.1 71.9 75.2 76.7 76.9 77.4 77.9 78.7 79.1 80.0

GE 25109 57.6 59.9 66.9 70.5 72.1 79.9 76.8 77.5 79.0 79.2 79.7 80.2 81.1 861.9 82.3C GE 20001 60.5 63.0 69.6 73.8 S.0- 41 77.9 80.3 81.1 82.5 82.8 83.3 83. 89.6 85.0 8s.$

GE 18.10 60.5 63.0 69.6 73.8 75.'. 77.9 80.3 61.1 82.5 82.8 83.3 83.7 89.6 85.0 85.8GE 15001 61.6 68.1 70.9 75.3 76;9 79.5 82.0 82.8 89.2 89.5 85.0 85.5 86.3 86.7 87.5GE 1200I 62.8 65.9 72.4 76.8 78.4 1.2 3.7 89f.5 86.1 86.3 86.8 873 86.1 9 88. 89.9

GE 9OUJi 63.7 b6.9 73.5 78.0 79.7 82.8 85.5 86.6 88.3 88.5 89.0 89.5 9.3 911.7 91.6GE 9001 69.2 66.9 7.0. 75S 80.2 83.3 85.9 87.0 a6.8 89.0 89.5 90.0 90.8 91.2 92.1GE 8001 69.3 61.1 79.9 79. 80.7 83.9 86.6 87.8 89.5 89.7 90.2 90.7 91.6 91.9 92.8GE 75090 69.8 67.6 1.9 79.5 81.2 89 1#.9 87.9 8.6 90.3 90.6 91. 91.6 92.5 92.9 93.8

Q GE 6001 65.0 67.8 75.2 79.7 81.9 89.7 87.9 89.2 91.2 91.9 92.1 92.5 93.S 9 7.9 94.?

GE sOil 65.2 68.0 75.3 79.8 81.8 85.1 88.5 90.1 92.2 92.9 93.3 99.1 95.1 95.5 9b.3GE 9001 65.2 68.0 75.3 80.2 62.2 85.7 88.9 90.8 93.2 93. 99.5 95.8 96.3 96.7 97.7GE 3001 65.2 68.0 75.4 0.3 2.9 8.7 89.1 91.1 93.9 93.9 95.2 96.1 97.3 97.7 98.7GE 201 65.2 68.0 750 80.3 82.9 85.7 89.1 91.1 93.9 93.9 95.2 96.1 97.3 97.8 98.8GE 1009 65.2 6804 75.18 80.3 82.4 85.7 89.1 91.1 93.9 93.9 95.2 96.1 97.9 97.9 99.6

GE Ol 65.2 604 75. 80.3 82.9 85.7 89.1 91.1 93.4 93.9 95.2 96.1 97.9 97.9 100.0...................................... ........................................................................ ...........................


. L

O GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FRO" HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: ?8-07

MONTm: SEP HOURSILSTI: 0900-1100C .. ...... .... ..... .. ... ..... ..... ... .. ........ ... ....... ....................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN 9 GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEo FEET I 160 90 80 60 48 90 32 29 20 16 12 10 8 5 4 0

o NO CEL I 32.2 33.1 35.9 36.1 36.2 36.8 37.3 37.5 37.7 37.7 37.8 37.8 37.8 37.8 37.8

GE Z0001 92.1 93.2 45.4 96.3 4649 97.0 97.7 48.0 48.3 48.3 98.9 48.4 48.4 99. 48.4o GE 180001 42.1 93.2 4509 96.3 46.4 97.0 97.7 98.0 48.3 98.3 98.4 98.9 984 98.4 98.GE 160001 92.2 93.3 45.5 46.4 46.6 47.1 47.8 48.1 48.4 98.9 48.5 98.5 98.5 98.5 98.5GE 190009 92.9 93.9 45.6 96.6 967 97.3 48.0 48.2 48.5 98.5 98.7 98.7 98.7 98.7 98.7GE 120009 93.3 99.7 96.9 47.8 48.0 48.5 49.9 49.6 49.9 99.9 50.1 SOti S0.1 50.1 50.1

GE 100001 46:6 98.2 50.5 51.7 51;8 52.4 53.2 S3.4 53.8 53.8 53.9 53.9 53.9 53.9 53.9GE 90001 47.6 i9t2 51.8 53.1 53.2 53.8 S9.7 55.1 55. .55.9 55.5 55.5 55.5 5S5. 55.5GE 800 51.2 53.1 5S.9 57.3 57.5 58.1 59.0 S9.4 S9.7 59.7 59.9 59.9 59.9 59.9 59.9GE 70001 52.2 S4.0 56.8 S8.2 S8.'5 59.0 60.2 60.6 60.9 60.9 61.0 61.0 61.0 61.0 61.0G 60001 52.4 59.3 57.1 S8.5 58.7 59.3 60.9 60.8 61.1 61.1 61.3 61.3 61.3 61.3 61.3

GE 50009 55.9 57.8 61.0 62.9 63.5 64.2 65.3 65.7 66.0 66.0 66.2 66.2 66.2 66.2 66.2o GE 4SO 57.3 59.2 62.7 64.6 65.2 66.0 67.2 670.6 67.9 67.9 68.0 68.0 68.0 68.0 68.0GE 90001 61.0 63.0 66.7 68.8 69.9 70.9 7I.S 71.9 72.2 72.2 72.3 72.3 72.3 72.3 72.3GE 35009 63.6 65.6 69.8 71.9 72:5 73.4 746 74.9 75.3 75.3 754 75.4 75.4 75.11 75.40 GE 30001 69.1 71.2 75.4 77.5 78.'1 79.0 0.2 80.5 80.9 80.9 81.0 81.0 81.0 81.0 81.0

GE 25001 70.2 72.6 76.8 79.0 79.6 80.5 81.7 82.0 62.4 82.9 82.5 82.5 82.5 82.5 82.5o GE 20001 73.0 7s.5 80;0 82.3 83.0 84.0 85.2 85.5 85.9 85.9 86.0 86.0 86.0 86.0 86.0GE 1810G 731 75.8 80.5 82.7 83.4 84.5 85.6 86.0 86.3 86.3 86.5 86.5 86.5 86.5 86.5GE 15009 76.4 79.1 84.1 86.5 87."2 88.2 89.7 90.1 90.5 90.5 90.7 90.7 90.7 9f.7 90.7o GE 12009 78.5 81.3 86.9 89.4 90.1 91.4 92.9 93.2 93.7 93.7 93.8 93.8 93.8 93.8 93.8

GE 10001 79.1 61.9 88.0 90.4 91.1 92.8 94.3 94.7 95.2 95.2 95.3 95.3 95.3 95.3 95.3GE 9001 79.1 81.9 88.0 90.8 91.6 93.2 94.7 95.2 95.7 95.7 95.8 95.8 95.8 95.8 95.8GE 8001 79.2 82.1 88.3 91.2 92.1 93.8 95.3 95.8 96.3 96.3 96.9 96.9 96.4 96.9 96.4GE 760 7902 82.1 88.4 91.5 92.3 944 96.1 96.6 97.1 97.1 97.2 97.9 97.9 97.# 97.4G 6009 79.2 82.1 88.7 91.7 92.5 94.7 96.6 97.1 97.8 97.8 97.9 98.1 98.1 98.1 98.1

GE S0l 79.2 82.1 88.7 91.9 92.8 95.0 96,8 97:3 98.1 98.2 98.: 98.7 98.7 98.7 98.7GE 4009 79.3 82.3 888 92.2 93.0 95.2 97.2 97.8 98.9 99.1 99.2 99.6 99.6 99.6 99.6GE 3009 79.3 82:3 88.8 92.2 93.0 95.2 97.2 97.8 98.9 99.1 99.2 99.6 99.6 99.6 99.6GE 2091 79.3 82.3 88.8 92.2 93.0 95.2 97.2 97.8 98.9 99.1 99.2 99.6 99.6 99.6 99.6GE 1o0 79.3 82.3 886 92.2 93.'0 95.2 97.2 97.8 98.9 99.1 99.2 99.6 99.6 99.6 99.6

GE 09 79.3 82.3 88.8 92.2 93.0 95.2 97.2 97.8 98.9 99.1 99.2 99.6 99.6 99.8 100.0

..............................................................................................................................................


-4

C)


us aFET aC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAKE: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: ?8-67MONTH: SEP MOURSILSTI: 1200-14,00


IN I G GE GE GE GE GE GE GE GE GE GE GE GE GE GE GECFEET I160O 90 a 60 60 14A VO 32 29 20 16 12 10 a 5 V 0

NO CEIL I 31.1 33.0 39.2 34.4. 34.4 39.9 39.9 39.9 39.9 34.4 34.V1 39.4 34.V 3V.4 34.4

GE 200001 42.9 93.9 41.? 46.1 96.1 '46.1 946.1 %b.1 46.1 46.1 46.1 96.1 916.1 966.1 Is6. I

GE 160001 42.7 99.2 95.9 46.3 96.3 46.3 96.3 96.3 96.3 96.3 %b.3 416.3 .96.3 .6.3 46.3GE 140001 92.6 44.3 96.0 116.5 96.5 46.5 916.5 46.5 46.S 96.1 46.5 46.S 46.5 405.51 6.5GE 120001 414. 1 95.5 47.3 47 .? Vt.? Vt .? T7.? 417.? 4?.7 V47.? t7. ? 97.? 9 7.? 97.7 47.7

GE 100001 VS.'. SO.0 51.6 52.3 SN2.3 52.3 S2.3 52.3 52.3 52.3 S2.3 52.3 52.3 52.3 52.3CGE 90001 49.t. S0.7 52.: 53.1 53.1 53.2 S3:2 S3:2 53.2- 13.2 53.2 S3.2 S3.2 S 3:2 53.2

GE £00101 51.7 S3. 55.5 55.9 S S;9 56.1 S6.1 56. I 16.1 56.1 56.1 56.1 16.1 56.1 S6.I

GE 70001 S2. I 5S3.9 55.A 56.3 S6;3 S6.4 56.9 56.% S6.11 16.9 16.9 $6.4 56.4 56.9 S6.4oGE 60001 S2.2 S4.0 55.9 S6.4 16.4 16.5 16.5 56.5 S6.S 56.5 56.5 56.S 56.5 56.5 16.5

SE soI 55.3 57.6 59.8 60.4 60.11 60.3 60.5 60.5 60.5 60.1 60.5 60.1 60.1 6t1.1 60.1o6E V5801 S6.9 61.3 641.0 64.5 6V1.5 64.6 69.6 691.6 69.6 6V.6 64.6 69.6 69.6 69.6 69.6GE ##0001 65.2 67.6 70.6 71.3 71.3 ?1 .V4 71.91 71.44 71.9 71.4 71.4 71.4 71.9 ? 1.9 71.4GE 3S001 70.6 73.7 76.7 77.3 77.3 77.1 77.5 77.1 77.5 7?.5 77.1 77.5 77.5 77.5 77.1oGE 3eG0I 79.6 62.5 65.6 06.3 66.94 66.5 66.5 86.5 66.5 66.S 66.5 66.1s 66.5 6 6.5 66.1

GE20!31 6.2 699 90. 110 90.2 90.4 90.41 90.4 90.* 90.9 9 0. 1 90.9 0. 0V 0.o6E 2300 95.6 66.9 922 93.0 93.2 93.5 93.5 93.5 93.1 93.5 93.5 93.5 93.5 93.5 93.sGE 16001 91.? B9.0 92.41 93.2 93.6 93 .B 93.6 93.6 93.6 93.6 93.6 93.6 93.6 9 3.6 93.6GE 15001 B?.? 90.5 9V.1 9S.2 95.5 9S.9 95.9 91.9 95.9 91.9 95.9 95.9 95.9 9S.9 95.9KGE 12001 67.6 91.0 99.6 95.9 96.2 96.? 9b.7 96.7 96.7 96.? 96.? 96.? 96.7 96.? 96.?

GE 10001 67.6 91.1 91.0 96.3 96.7 97.3 97.3 97.3 97.4 97.9 97.9 97.9 97.4 97.11 97.9o6E 9001 87.9 91.3 95.3 96.7 97.0 97.6 97.6 97.6 97.7 97.7 97.7 97.7? 91.7 97.7 91.7GE 6001 86.0 91.5 95.6 97.1 97.1 96.1 96.2 96.3 96.9 96.94 96.9 96.9 96.9 98.91 96.9GE tool 96.0 91.5 95.9 97.3 97.7 96.3 96.9 96.1 96.7 96.7 96.7 99.1 99.1 99.1 99.1GE 6001 66.1 91.6 96.1, 97.1 97.9 96.1 96.6 96.7 99.C 99.0 99.0 99.3 99.3 99.3 99.3

GE lao! q6.1 91.6 96.1 97.5 97.9 96.5 99.0 99.1 99.9 99.9 99.9 99.6 99.6 99.6 99.6GE %Gal 86.1 91.6 96.1 97.1 97.9 98.1 99.0 99.1 99.9 99.9 99.49 9.6 99.6 99.6 99.6GE 3001 66.1 91.6 96.1 97.1 97.9 96.1 99.0 99.1 99.91 99.1 99.5 99.9 99.9 99.9 99.9GE 2001 66.1 91.6 96.1 97.1 97.9 96.5 99.0 99.1 99.9 99.1 99.1 99.9 99.9 99.9 99.9

I )GE 1001 66.1 91.6 96.1 97.1 97.9 96.5 99.0 99.1 99.9 99.S 99.5 99.9 100.0 100.0 100.0

GE 01 96.1 91.6 96.1 97.1 97.9 98.5 99( 99.1 99.9 99.1 99.5 99.9 100.0 103.0 100.0


-)

.1.

2

GLOBAL CLINATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUUSAET C c FROM OURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO'IBURY UNITED KINGDOM PERIOD Of RECORD: 78-6?MONTH: SEP HOURSELS): 1500-1730

.............. !0 .... ...... o00 ....... Boo;.oo; ;; ..........................

CEILING VISIBILITY IN HUNIN JG GE GE GE GE GE GE GE 6E 6E GE GE GE GE GE GE

0 FEET I 160 90 so 60 6 80 32 2q 20 16 12 10 a 5 8 0

0) NO CEIL I 33.7 35.5 36.9 37.0 37.0 37.0 37.8 37. 37. 37. 37. 37.6 37. 371. 31.

GE 200001 82.5 88,8 86.0 86.3 16.3 86.3 86.6 86.6 6.6 86.6 86.6 6.6 86.6 86.6 86.6

GE 18000! 2.6 88.5 86.1 86.8 86.8 9.6.8 4 6.7 86.7 86.7 86.7 86.7 86.7 86.7 86.7 86.7bE 160001 82.6 48.s 86.1 86.81 46.8 86.8 86.7 16. 86.7 86.7 86.7 8607 86.7 86.7 '.6.7GE 18000! 43.0 88.& 86.5 6.7 86.7 86.7 87.1 87:1 87.1 8 7.1 81. 1 87.1 87.1 87.1GE 120001 88.8 86.3 98.1 0.8 88,8 8. 987 8.7 807 88.? 88.7 487 88.7 88.7 88.7

GE 100001 9.9 52.0 5.:2 58.8 58.8 588 58.:6 5. 5 8.8 58.8 586 58.6 58 S8.6

GE 900 51.9 S8.0 56.3 56.6 56.6 5.6 56.9 69 56'9 56.9 56.9 56.9 56.9 S6.9 56.96E socaI 56.1 58.3 60.81 61.0 61.0 6 61.8 61.8 61.8 61.8 61.8 61. 61.8 61.8 61.8GE 7000 56.9 S9.1 61.6 61.8 61.6 61.8 62.2 62.2 62.2 62.2 62.2 62.2 62.2 62.2 62.2GE 6e00 57.0 S9.3 61.7 61.9 61.9 61.9 62.3 62.3 62.3 62.3 62.3 62.3 6Z.3 62.3 62.3

6E 50001 59.7 62.5 65.1 65.3 65.3 65.3 65.7 65.7 65.7 65.7 65.7 65.7 6S.? 65.7 65.7oGE 4S001 6S.5 68. 71.8 71.7 71.7 11.7 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0 72.0GE %0001 72.0 75.6 79.3 79.6 79.6 79.7 80.1 80.1 80.1 80.1 80.1 60.1 80.1 60.1 80.1GE 3500! 77.8 81.1 65.0 85.8 6.8 6. 85 6 65.6 85.8 86 85.6 86 6s.8GE 3300 83.0 869 91.1 91.6 91.6 9?1 92.0 92.0 92.0 92.0 92.0 92.0 92.0 92.0 92.0

BE 25001 88.8 86.3 92.5 93.0 93.0 93.1 93.8 93.8 93.8 93.8 93.8 93.8 93.8 93. 93.8GE 20001 866. 90.8 98 .8 95.8 95.8 95.6 95.9 96.0 96.1 96.1 96.1 96.1 96.1 96.1 96.1GE 16001 86.7 90.6 95.1 95.7 9S.7 95.6 96.1 96.3 96.8 96.8 96.8 96.8 96.8 96.8 96.1GE 15001 87.2 91.2 IS,9 96.5 96.5 96.1 97.1 972 97.3 97.3 97.3 97.3 973 91.3 91.3. GE 12001 81.8 91.3 96.1 96.7 96.? 971 97.5 97.7 97.8 97.8 97.5 97. 91.6 97.6 91.8

GE 1000J 67.7 91.7 96.5 97.1 97.1 97.5 98.0 98.1 980.2 98.2 98.2 98.2 98.2 98.2 98.20 GE 9001 67.6 91.8 96.7 97.8 97.8 97.9 96.8 98.5 90.6 98.6 98.6 98.6 98.6 99.6 986.

GE 6001 88.2 92.2 97.1 97.9 97.9 98.8 98.8 98.9 49.1 99.1 99.1 99.1 99.1 99.1 99.1GE 7001 68.2 92.2 97.1 97.9 97,9 96.5 99.1 99.3 99.5 99.5 99.6 99.8 99.8 99.8 99.6GE 6001 86.2 92.2 97.1 97.9 98.0 98.6 99.2 99.8 99.6 99.6 99.8 99.9 99.9 99.9 99.9

GE 5001 86.2 92.2 97.1 97.9 98.0 90.6 99.2 99.8 99.6 99.6 99.8 99.9 99.9 99.9 99.9O GE 8001 66.2 92.2 97.1 97.9 90.0 90.6 99.2 99.8 99.6 99.6 99.8 99.9 99.9 99.9 99.9

GE 3001 85.2 92.2 97.1 97.9 98.0 98.6 99:2 99:. 99.6 99.6 99.8 99.9 10000 100.0 100:0GE( 20Q 66.2 92.02 97.1 97.9 96.0 98.6 99.2 99.8 99.6 9906 99.8 99.9 1000 103.0 100.0GE 1001 08.2 92.2 97.1 97.9 98.0 96.6 99.2 99.8 99.6 99.6 99.8 99.9 100.0 100.0 100.0

GE Gi 80.2 92.2 97.1 97.9 95.0 98.6 99.2 99.8 99.6 99.6 99.8 99.9 100.0 103.0 100.0

TOTAL NLMBER OF OBSERVATIONS: OS

*e

,,,

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUS"FIEYAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC0STAIION NUMBER: 03S623 STATION NANE RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 76-67

:ONTH4: SEP HOURSILSTI: 180-20000.. .............................. . ... .... .. . ....o...o ....... .. o. .. . ..

CEILING VISIBILITY IN HUNDREDS OF METERSIN 161 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 s0 60 66 10 32 21 20 16 12 10 8 5 6 0. ...... ........ .. ......... o...............

NO CEIL 37.7 1406 63.6 437 63.7 66.0 66.1 66.1 44.1 11.1 14.1 66.1 1 '4.1 11

GE 200001 65:0 98.2 Se. 51.9 51.9 52:3 52.6 526 52.6 52.6 526 52.6 52.6 52:6 52.6.1 GE 150001 15.0 68.2 51,6 51.9 51.9 52.3 52.6 52 6 52.6 52.6 52 6 52.6 52.6 52.6 52*6GE 10001 15.0 8.2 51.6 51.9 51.9 52.3 $2.6 52.6 S2.6 52.6 52*6 52.6 52.6 52.6 52.6GE 1%0001 65.69 68.6 52.0 52.3 5203 52.7 53o0 53.0 53.0 53.0 53.0 53.0 53.0 53.0 53.0GE 120001 46.0 69.3 S2.7 53.0 53.0 53.6 S3.7 53.7 53.7 53.7 53.7 53.7 53.7 S3.7 5307

GE 100001 50.S 53.8 57.6 57.6 57.8 58.2 58.6 58.6 58. 58.4 56.6 56.14 58.6 58. 56.6K GE 90001 51.5 56.9 58.6 59.0 590 59.5 59.8 59.8 59.6 59.8 S.96 59 8 59.8 59.8GE 60001 5.6 56.2 62.6 63.1 63.1 63:.8 66.0 6140 66.0 66.0 66.0 66.0 66.0 66.0 66.0

GE 70001 55.6 S9.1 63;S 66.3 66.3 65.0 65o3 65.3 653 65.3 65.3 6S.3 65.3 65o3 65.30GE 600011 56.0 S9.5 63.9 6.7 66,7 6Sil 65.7 65.7 65.7 65.7 65.7 65.7 65,7 65.7 65.7

GE SO01 58.3 62.6 67.7 66.8 68.9 69.8 70.0 70.0 70.0 70.0 70.0 70.0 70.0 70.0 70.0GE 65001 62.5 67.0 73.0 76.1 714.3 75.1 75.3 75.3 75.3 75.3 75.3 73.3 75.3 75.3 75.3GE 60001 67.2 71.8 76.7 79.8 60.0 60.6 61.1 61.1 61.1 81.1 61.1 61.1 61.1 81.1 81.1GE 3500J 711 76.0 83.0 81.1 814.2 65.0 65'3 85.3 85.3 85.3 85.3 85.3 65.3 65.3 65.3

C. GE 30001 75.1 60.0 87.1 88.3 88.6 69.14 69.8 69.8 89.8 89.8 89.8 89.8 69.8 89.8 89.8

GE 25001 77.0 82.2 69.6 90.9 91.0 92.1 92.5 92.5 92.5 92.5 92.5 92:5 92.5 92:5 92:5GE 2t' 0J 787 63.9 91.7 93.1 93.2 9.1 914.8 9148 96.8 96.8 95.0 95.0 95.0 95.0 95.0GE 16001 78.9 8601 91.8 93.2 93.3 94.7 95.1 95.1 95.1 95.1 9S.2 95.2 95.2 95.2 9S.2GE 15001 79.7 86.9 92.'6 96.3 94.% 95.8 96.2 96.3 96.3 96.3 96.5 96.5 96.5 96o5 96.5

" GE 12001 800.5 65.6 93.7 95.2 95.64 96.9 97.6 97.5 91.5 97.5 97.7 97.? 97.7 97.7 97.7

GE 10001 80.7 86.0 96.0 95.5 95.6 97.3 97.8 98.0 98.0 98.0 98.1 98.1 98.1 94.1 98.1C GE 9001 800.7 86.0 96.1 95.6 95.8 97.60 980 98.1 98.1 98.1 98.2 96.2 96.2 98.2 96.2

GE 8001 91.1 86.1 96.6 96.0 96.2 97.8 98.5 98.6 98.6 98.6 96.8 96.8 96.8 914.6 98.8GE 7G0l 81.2 86.5 96.7 96.2 96's 98.1 98.8 99.0 99.0 99.0 99.2 99.2 99.2 99.2 99.2GE 6001 61.2 66.5 94.8 96.3 96.6 98.2 98.9 99.2 99.2 99o2 99.3 99.3 99.3 99.3 99.3

GE SoDi 01.2 86.5 96.6 96.3 96.6 98. 99.0 99.3 99.3 99.3 99.5 99.5 995 . 99.50 GE 4001 81.2 66.5 96.8 96.3 96.6 98 .6 99.0 99.3 99.5 99.5 99.6 99.6 99.6 99.6 99.6

GE 30u1 81.2 865 91 96.3 96.6 98,1 99.0 99:3 99.5 99.5 99.6 99:6 99:6 99.6 99.6GE 2001 61.2 86.S 96.8 96.3 96.6 96.6 99.0 99.3 99.5 99:5 99.6 99.6 99.6 IGfa.0 100.0GE 1001 81.2 86.5 96.8 96.3 96.6 98.6 99.0 99.3 99.5 9q5 99.6 99.6 99.6 100.0 100.0

GE al 91.2 66.5 96.8 96.3 96.6 9o.14 99.0 99.3 99.5 99.5 99.6 99.6 99.6 130.0 100.0..............................................................................

T07AL NWI8ER OF OBSERVI71OKS: 736

2.

SGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Of CEILING VERSUS VISIBILITYs As TAC FRO" HOURLY OBSERVATIONS

AIR WtATHER SERVICEIMACSTATION NUMBER: 035623 STATION NAME: RAF ALCOBURV UNITED KINGOM PERIOD OF RECOR: 7-87

© MONTH: SEP HOURSILSTI: 2100,'2300

... .. .. .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. ..... .. .. .... ...;.. .. .. .. .. .. .. .... .. ..CEILING VISIBILIN UDRD F EET* .

IN GT BE r. E [ BE BE GE E BE BE GE E G( BE 61 GE r6E

FEET 3 160 90 60 60 8 't 32 26 20 16 12 10 a 5 4 0

NO CEIL I 61.0 6.0 48.6 50.2 50.5 50.7 50.7 50.7 50.7 50.7 50.7 50.7 507 50.7

NO E 1600014 O.G200001 916.3 49.9 Sq*8 . 5 7.6 57.9 58.1 8. 580 1 58, 1 58 .1 58 .1 so. 501 58.1 S . 58.1

0 [ 1 0 0 0 1 4 6 3 9 9 5 14 .6 5 7 6 7 9 5 6 1 5 8 1 5 8 o 1 5 8 , 1 5 8 1 5 8 .1 5 . 1 6 o 1 s . 1 5 8 0 1

GE 160001 %b.3 69.9 54.8 S7.6 57.9 58,1 58.1 S8.1 58.1 58.1 58.1 580.1 58.1 5801 58.1GE 140001 966. 50.1 56.9 57.8 58.1 58.2 58.2 58.2 56.2 5b2 56.2 58.2 58.2 58.2 58.2o G 120001 47.6 51.2 56.0 58.9 59.2 S9.3 59.3 59.3 S9.3 59.3 59.3 59.3 59.3 $9.3 59.3

GE 100001 50.2 53.8 59.0 62.2 62.5 62.6 62.6 62.6 62.6 62.6 62.6 62.6 62.6 62.6 62.6E G 90001 51.6 55.6 60.8 63.9 642 66.6 64.4 64.4 66.6 64. 64.4 644 64.6 64.4 64.

GE 60001 55.6 69.7 65.1 68.3 68.6 68.6 68.8 68.8 68.8 68.8 66.6 68.8 68.8 68.8 68.6GE 70003 55.7 59.8 6S.3 68.6 68.8 68.9 68.9 66.9 68.9 68.9 68.9 66.9 68.9 68.9 68.9GE 60001 56.0 60.1 65.6 68.8 69.1 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2 69.2

BE Soo 586. 62.3 68.4 71.6 71.9 72.5 72.5 72.5 72.5 72.5 72.5 72.5 72.5 72.5 72.SGE 45001 61.7 66.1 72.6 765 75.8 76.5 7605 76.5 76.5 76.5 76.5 76.3 76.5 76.5 76.5GE 60001 65.3 70.3 76.'9 60.2 80.5 81.2 81.2 81.2 81.2 8102 81.2 81.2 61.2 61.2 61.2GE 35001 67.8 72.8 79.4 82.7 83.0 83.7 83.7 63.7 83.7 63.7 83.7 83.7 63.7 83.7 83.lG 30001 71.3 76.5 83.0 87.0 67.3 67.9 07.9 07.9 87.9 87.9 07.9 87.9 87.9 87.9 87.9

GE 2SoI 73.5 79.0 05.7 89.6 90.0 90.6 90.6 90.6 90.6 90.6 90.6 90.6 90.6 93.6 9,.6GE 20001 74.9 80.6 67.6 91.8 92.2 92.9 92.9 92.9 92.9 92.9 92.9 92.9 92.9 92.9 92.9GE 18003 76.9 80.6 67.8 91.8 92.2 93.1 93.1 93.1 93.1 93.1 93.1 93.1 93.1 93.1 93.1GE 15003 76.s 82.6 69.5 93.6 93.9 95.1 95.3 96.3 95.3 95.3 95.3 9S.3 95.3 953 95.3G 12001 76.6 82.7 90.0 9%.5 96.6 96.1 96.2 96.2 96.2 96.2 96.2 96.2 96.2 96.2 96.2

GE 10001 76.9 62.9 90.6 95.1 95.6 97.0 97.3 97.3 97.3 97.3 97.3 97.3 97.3 97.3 97.3E G 9003 77.1 63.0 90.6 95.3 95.8 97.2 97.5 97.5 97.5 97.5 97.5 97.5 97.5 97.5 97.5

GE 0ool 77.1 83.0 90.7 95.6 959 97.3 97.6 97.6 97.6 97.6 97.6 97.6 97.6 97.6 97.6GE 7001 77.0 83.% 91.1 9s.8 96.2 97.6 98.0 96.0 98.1 96.1 98.1 96.1 98.1 98.1 96.1

SGE 6001 77.6 63.8 91.0 96.5 97.0 9.64 98.7 96.7 96.9 98.9 98.9 96.9 98.9 9A.9 98.9

GE 5001 77.6 63.8 92.2 96.9 97.3 98.7 99.1 99.1 .99.2 99.2 99.2 99.2 99.2 99.2 99.2

GE 001 77.6 63.8 92.2 97.0 97.5 96.9 99.2 99.2 99.4 99.61 99.4 99.4 99.6 99.6 99.4GE 3001 77.6 83.6 92.2 97.0 97.. 98.9 99.2 99.2 99.4 99.6 99.4 99.4 99.4 99.4 99.4GE 2001 77.6 83.8 92:2 97:0 97.5 96.9 99:2 99.2 99.6 99.6 99.6 99.6 99.6 99:8 99.6

* GE 1001 7.06 83.6 92.2 97.0 97,5 98 .9 992 99.2 99.6 99.6 99.6 99.6 99.6 99.6 100.0

GE 01 7.6 63.8 92.2 97. 97.5 98.9 99.2 99.2 99.4 99.6 99.4 99.4 99.8 99.6 100.0..............................................................................................................................


gH

|r - --I ! r| ,

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM I-OULY OBSERVATIONSAIR NEAT*ER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: ?6-67MONTH: SEP HOURS IL S I: ALL

CEILING VI1I6ILITY IN HUNDREDS OF METERSIN 16 1 GE E GE GE GE G E GE GE GE G E G E G E G E G E G E

FEET I 160 90 s0 60 46 60 32 26I 20 16 12 10 6 5 0

NO ClL 33.7 35.3 37.6 36.0 36.9 39.5 40.1 60.3 60.7 640.6 60.9 61.0 41.1 61.2 11.6

GE 200001 61.0 62.9 45.6 6.9 1.:3 67.9 ',6 66.6 .9.2 69.: 195 9.6 69.? :9.6 69.9) G1E 1100 11 63.0 65.6 67.0 07.3 . .0 6.6 66.9 6 9.3 49. 69.1 9.6 69.8 69.6 a0.0GE 160001 61.1 63.0 150. 67.0 607.3 16.0 68.7 16.9 69.3 69.6 69.5 69.7 69.6 69.9 50.0GE 16000| 61.3 63.2 66.0 67.2 67.5 66.2 66 69.1 49. 69.6 6.9.7 69.6 50.0 5l0:0 50.2O GE 120001 62.2 66.2 67.1 66.2 66.5 9.2 69.9 50.1 SOS 50.6 50.7 50.9 a1.0 51.1 51.2

GE 10001 ts7.? 67.9 51.1 52.6 52.7 S3.6 56.0 56.3 S%.7 16.6 56.9 55.1 5S5.2 55.3 S5.6GE 90001 6.7 69.0 52.2 53J. 53.9 $6. 55.3 S5.5 56.0 S6.1 S6.2 56..3 56.5 56.5 Sb.?GE £0001 50.6 12.7 56.2 17.6 S00 56.7 59.5 S9.7 60.2 60.3 60.6 600.6 60.7 br.6 60.9GE 70001 S1.1 S3.6 56.9 56.3 56.7 59.5 60.3 60.5 61.0 61.1 61.2 61.3 61.5 61.5 61.7GE 60001 S1.2 S3.6 57.1 56.5 S1.9 59.7 60.5 60.7 61.2 61.3 61.61 6.S 61.7 61.7 61.9

GE S0001 56O 56.7 60.6 62.3 62.8 63.6 66.6 66*.9 65.3 61.6 65.S 61.7 65.6 65.9 66.0GE 15001 57.6 60.3 66#5 66.3 66.6 67.8 66.7 66.9 69.6 69.5 69.6 69.6 69.9 7.0 70.1GE 40001 62.6 65.7 70.6 72.2 72.6 74.0 0 75• 71.1 75.6 75.7 75.6 76.0 76.1 76.2 76.3GE 35001 66.2 69.5 76.6 76.2 76.9 76.0 70.9 79.2 79.6 79.8 79.9 60.0 AO.2 0C2 60.6GE 30001 70.7 76.1 79.1 61.1 61.9 83.0 63.9 8.2 867 6.6 66.9 A5*1 65.2 65.3 85.6

GE 25001 72.6 76.1 1.3 63.6 64.2 65.6 66.6 66.6 67.1 67.3 67.6 67. 67.6 67.7 67.9GE 20001 16,7 76.5 63.6 66.1 069 66.3 69.2 69.5 90.0 90:2 9003 900 9006 906 90.0GE 18001 716. 78.6 66.0 66.3 67.1 865 69.6 69.7 90.2 90.6 90.5 90.6 90.6 9 0. 91.0GE 15001 76.2 80.0 6S.6 8.0 66.8 90.3 91.3 91.6 92.1 92.3 92.6 92.S 92.7 9?08 92.9

Q GE 12001 7?o2 61.1 06.8 09.3 90.01 91.8 92.9 93.2 93.6 93.9 96.0 91.2 961.3 94.4 96.5

GE 10001 77.6 61.7 67.7 90.2 91.1 92.9 96.1 96.5 950 95.2 95.3 95.1 95.6 95.7 95.6o GE 9001 7800 61.9 67.9 90.5 91.6 93.2 96.6 96.6 95.3 95.5 95.6 95.6 95.9 96.0 961GE 6001 76.3 B2.3 66.6 91.0 91.9 93.8 95.0 9S. 96.0 96.1 96.2 96.6 96.6 96.6 96.6GE 7001 '8:S 62.6 86.7 91.3 92.2 96.2 95.5 96.0 96.6 96.6 96.9 97.1 97.3 9716 975o GE 6001 76.6 62.1 as9 91.6 92.5 961 95.9 96 997.6 97.7 97.9 97.9 96.1

GE 5001 76.6 62.6 69.0 91.7 92.7 96.7 96.2 96.6 97.6 97.6 96.0 96.3 96.6 96.5 96.7o GE 6001 766 62.6 69.1 91.9 92.9 96.9 96.5 97.1 96.0 96.2 96. 96.6 99.0 990 99.2GE lo00 78.6 62.6 69.1 91.9 92.9 96.9 96.5 97.2 '96.1 96.6 96.7 99.0 99.2 99.3 99.5GE 2001 16.6 62.6 89.1 91.9 92.9 96.9 96.6 97.3 98.2 96.6 96.7 99.0 99.3 99.s 99.7I GE Doo 76.6 82.6 89.1 91.9 92.9 96.9 96.6 97.3 90.2 96.5 98.7 99.1 99.6 9Q.S 99.9

GE 01 786 62.6 69.1 91.9 92.9 96.9 96.6 97.3 98.2 99.5 96.7 99.1 99.6 97.6 100.0................................................................................. ............................................................


.mm

) GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYus rcTac FROM HOUQLY OBSERVATIONS

AiR LiE81E.R SETTICNN/MAC

*T110 NUMBER: 01623 SEATION N RME: AF ALCOVOURT UNITED KINGDOM PERIOD OF RECORD: 77-66NONYN: OCT NOURSILSTIz 0000-0200000*0.. ... ... • * eee; ; ; ; 'o ' ; " """"............. . . ... ... .. ...

EET'; L0 10 * * 60 46 *00 2 200 1 e e iieeei ;;i o€[ I1kG vII Lr IN HNRED OF TR

1C 1 $G GE BE 6( GE 6E GE GE GE GE 6E SE GE GE GE GEGo 60 461 100 32 2. 2. 16 12 1 . 5 a. 1

.NO C(IL 903.0 %S0 6 49.5 51.0 51.2 12.1 $2.6 12. 63.2 50. S1.2 5.2 6.2 6.4 S2.0

E( 2 00 0 0 1 '53 0 1 :| S S S S : 7 S '06 S 70 3 S T:3 $ 7 , 7 $ 8 00 S 8 07 ': : 1' 58 7 S809 , S , 5GE 60001 52.6 15.1 S91 60S1 SS 0 S6.6 S7.3 62.3 62,7 S.1 63.6 63.6 63.6 6409 5.1GE 160001 58.3 S.1 S9. 6.1 SS .7 56.6 62.3 62.3 67.7 6301 6.7. 63.6 66 64.90 SE( 140001 e3 SO?& 54:1 SS*S 5S07 S::6 57:03 57:3 S7:7 so,0 580 $0 $87 9 $95

E[ 1 '0008 ::,S S0.3 S41 2 SS07 5S09 $6. a 7* S? 0 ST S 0Y S,02 50.:9 $80:9 $80g 591 $9:6

G 100001 50.3 521 S6.0 50. 67.7 $606 S9.3 S9.3 S9.6 0.0 60.7 60.T 60.7 64.9 614- GE 10001 s.6 S2.6 56.6 S20 SZ S9.1 S9.6 $96 60.2 60. 61.3 61.3 61.3 61. 62.0

fGi $coo 52. SS1 59.1 60.S 60.7 61. 62.3 623 627 631 63.4 638 63.4 67.0 66.16E 70001 52.8 S501 S9.1 60.S 6C,7 61.6 62.3 62.3 62.7 63.1 63.0 63.8 63.6 64.0 64.5

GE 60001 S3.2 SS.S S9.S 60.9 61.1 6.0, 62.7 62.7 63.1 63.4 6%.1 69,.1 690.1 64.3 64.9

SE SO4101 Sq.6 $6.9 60.9 62.3 62.8 63.4 69.1 641.1 64.S 64.9 65.6 6506 b5o6 6S.8 bb.36E %Q~Ort SS09 $809 62.3 64.1 69.3 bS .2 6S.9 6S.9 b6.3 6607 67.4 67.4 67.4 b 7.6 b6.1

6C %0001 S6.7 61.4 61.6 67.4 67.6 68.5 69.2 69.2 69.7 70.1 70.8 70.6 70. 71.0 71.1E 3SO0 60.S 63.2 67.4 69.4 69;S 70.6 71.4 71.4 71.9 72.3 73.0 73.0 73.0 7 3.2 73.7G 3000o 62.7 66.3 70.5 72.4 72.6 73.9 75.0 71.0 7S.5 71.9 76.6 76.6 76.6 76.8 77.3

GE 21001 6S.2 69.9 74.4 76.4 76.6 77.6 79.5 79.5 80.0 60.4 61.1 61.1 61.1 61.3 81.8G 20031 69.0 74.2 74.7 80.9 81.,3 62.7 64.7 64.7 8.4 8S.8 06.S 66.1 86. 86.7 67.26G 16001 69.0 74.2 76.9 $1.1 61.4 62.9 64.9 64.9 8.6 6S.9 66.7 66.7 66.7 86. 67.4.E IlOO, 71. 76.9 82.2 84.5 64.9 66.3 8.3 8.3 89.0 59.4 90.1 90.1 90.1 91.3 90.0GE 12001 72.4 70.0 83.2 S.6 @6.1 87.9 89.9 69.9 90.6 91.0 91.7 91.7 91.7 91.9 92.4

6E 10E.01 12.6 76.2 $3.6 66.3 67.0 66.1 q0S 90.8 91.1 91.9 92.6 92.6 92.6 92.8 93.3

GE 90fi 72.6 78.2 63.6 66.3 87.0 so .5 90.s 90.8 91. 91.9 92.6 92.6 92.6 92.0 93.3G 80ol 72.6 76.2 83.6 66.3 67.,2 88.6 91.0 91.4 12.1 97.4 93.2 93.2 93.2 93.3 93.9

GE 7001 12.0 76.4 63.6 66. 67.4 69.0 91:2 91.S :2: 92.8 93.1 93.5 9$*S 93:7 94.2G 6001 73.0 70.6 64.0 :66. 67.7 69. 4 91 91.9 92. 93.2 93.9 93.9 93.9 94.1 94.6

GE Scul 73.0 76.7 86.1 67.0 88.1 69.9 92.3 92.6 93.5 93.9 94.6 94.6 94.6 91.0 915.GE 4001 73.3 76.7 64.1 67.0 89.1 89.9 92.6 93.0 93.9 94.2 91.0 9S.1 95.1 91.3 91.9G 3001 73.0 7807 64.S 87.6 66.6 90.5 93.2 93.7 94.6 9S.0 9S1 91.9 9S.9 96.0 97.1GE 2001 73.0 70.7 6.S 87.6 80.6 90. 93.2 93.9 94.6 9S.3 96.0 96.4 96.% 96.6 977GE 1001 73.0 76.7 64.5 87.6 66.6 9OS 93.2 93.9 94.0 91.3 96.0 96.4 96.4 97.1 98.7

GE 01 73.0 [email protected] 641. 67.6 66.6 90.S 93.2 93.9 94.6 9S.3 96.0 96.4 96.4 97.1 100.0............................................................................................................................

TOTAL NUMBER Of OBSER VATIONS: %S5

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE IREQUENCV OF OCCURRENCE OF CEILING VERSUS VISIBILITTUsiETAC FROM IOURLY OBSERVAIIONSAI* WEATER SERVICE1MAC

STATION NUMBER: 03S623 STATION NAMEt RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURS(LSTI: 03U-0500

CEILING VISIBILITY IN llJNZREDS OF METERSIN I 61 GE GE 6E GE GE GE GE GE GE GE GE GE GE GE GE

0 FEET I 160 90 so 60 66 Ic 32 26 20 16 12 10 6 5 6 0o •go oo.. .. ... .. .. ... .. ... .. .. ... .. .. ... .. 0.. .. .. .41 . .o ... .. ... .. ... .. ... .. ... .. . ......0oo oe e

o NO CElL 1 13.3 35.7 39.6 60.7 41.b 62.9 63.0 63.6 46.2 66.2 60.6 66.7 656. %S.5 67.0

E 20C00 1607 39.3 63.6 45.0 65.9 67.1 67.2 67 9 46.5 4R.S 6.9 69.0 69.6 69.7 51.3180001 36:? 39.3 63:6 65:0 4S.9 97.1 67:2 17.9 485 6.5 68.9 69.0 69.6 9. 7 51.3

6E 160001 36.7 39.3 #3.6 SO 65.9 671 67.2 47.9 68.5 s.5 48.9 169.0 19b 49.7 51.3GE 140001 36.7 39.3 63.6 451.0 65.9 67.1 67.2 647.9 66.5 48.S 68.9 69.0 69.6 649.7 61.3GE 120001 37.3 *0.0 66.4 65.6 6.S 47.7 61.9 68.5 69.1 19.1 69.5 469.6 6O.3 5C.6 51.9

GE 10000 3682 109 65.1 6-S 67.6 08.6 68.7 69.6 50.0 SO. 50.1 50S 51.1 51.3 52.8E GE 9000 *9.6 62.5 16.7 68.1 69.0 S0.3 S0.6 61.0 51.6 55.6 52.0 52.1 52.6 52.9 S616

6E 60001 62.2 1657 S0o. 51.8 62.6 53.9 56.0 511.6 66.3 61.3 56.6 66.8 S6.6 66.5 58.06E 70001 62.6 65.9 50. 62.1 3.o0 S.3 S.6 56.0 S5.6 55.6 56.0 56.1 66.8 56.9 68.6G 60001 62.7 66.2 51.1 52. 53.' 56.6 56608 SS.1 S61 66.1 S6.5 56.6 57.3 57.1 58.9

GE 50001 66.7 %8.2 53.3 66.6 56.6 56.9 57.0 57.6 58.6 58.5 58.9 59.0 59.6 59.8 61.3(GE 6SOO 96.7 SO.S 5.8 $7.3 58.1 59.6 S9.S 60.2 61.0 61.0 61.6 63.5 62.2 62.3 63.6

GE 40001 69.9 S3.8 S90S 61.0 61.9 63.3 63.5 60.3 65.3 65.3 66.7 66.8 66.6 66.5 68.0GE 3MCQI 51.6 SS.5 61.8 63.3 61.2 66.2 66.6 67. 2 68 68 686 68.7 69.6 69.7 71.2GE 30001 53.8 57.$ 64.7 66.3 67.2 69.3 69.8 70.6 71.7 71.7 72.1 72.2 73.1 73.2 7167

GE 2S0|1 56.6 61;2 69.0 70.7 71.6 73.7 76.3 75.1 76.2 76.2 766 76.7 77.6 77.7 79.26E 20001 S9.5 66.0 73.1 7.7 76.A8 76.1 79.1 79.9 81.5 81.6 82.0 82.1 83.0 63.1 86.6GE 1001 S9.6 66.6 73.6 75.2 76.3 [email protected] 79.6 80.6 62.S 82.7 03.1 83.2 86.1 86.2 85.7GE 16003 61.8 66.6 76.9 77.7 78.8 81.1 62.1 83.1 86.0 66.3 65.7 86.8 867 86.8 8.3GE 12001 62.5 67.3 76.8 78.6 79.7 82.0 83.1 802 86.1 86.5 68 67.0 67.8 86.0 895

GE 1000: 83:2 67.9 77:6 79:1 807 :10 81:1 6SS :7.3 87:7 881 88.2 89:1 .9.2 90.70 G 9001 83.6 66.3 78.1 60.1 81.3 63.6 86.7 6. 88.0 66.3 88.7 69.0 69.6 910 91.5

GE 8001 61.0 66.8 78.6 60.6 @1.6'@ 6.1 85.5 67.0 8o.8 69.2 69.6 09.8 9007 90.9 92.6GE 7003 66.2 69.0 79.1 81.1 82.3 86.8 86.2 87.7 89.6 90.0 90.6 9006 91.5 91.6 93.1GE 6001 64.3 69.2 79.2 81.3 82.6 86.1 86.6 86.0 90.0 90. 90.7 91.0 91.9 92.3 93.5

GE 6500 64.3 69.2 79.2 61.3 62.6 85.6 87. 89.1 91.5 91.9 92.2 92.5 93.6 93.5 95.0GE 603 66.6 69.6 79.6 61.7 83.0 65.8 87.6 89.5 91.9 92.2 92.6 92.9 93.7 93.9 95.1GE 3001 64.6 69.1 19. 81.7 63.0 86.6 88.0 89.6 92.0 92.6 92.7 93.0 93.9 96.0 95.9GE 2031 64.4 69.6 790 81.7 83.0 85.8 88.0 89.6 92.0 92.6 92.7 93.2 0.2 94.5 97.0

* GE 11.01 66.6 69.6 79.4 @1.? 83.1 86.1 88.2 89.8 92.2 92.6 93.1 93.7 96.9 9505 99.1

GE 0t Go.61 69.1 79.% 81.7 03.1 86.1 86.2 89.6 92.2 92.6 93.1 9307 96.9 95.5 100.0


RAJ

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUs AFE ITA C FROM 14OURLY OBSERVATIONSAIR MiEATHER SERVICE/MAC

STATION NUMBERs 035623 STATION NiAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSILSTI: 0600-0600

.......................................................... . ....... o..........................CEILING VISIBILITY IN HUNDREDS OF METERS

IN 6GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 98 %a 32 24 20 16 12 10 8 5 N 0......... ... .................................................................................................

0 NO CEIL I 29.3 26'.6 29.b 31.3 31.? 32.8 33.9 314.0 3N.5 391.6 34.9 35.1I 35.2 3s.7 37.7

GE 200901 28.2 31.3 3N.9 36.8 37.2 38.7 39.4 N0.1 NI.0 NI.1 911.5 N1.? 91.9 92.6 %S.1o) GE 180001 28.91 31.5 35.1 37.1 37.N 38.9 39.7 NO.N 91.3 N1.4 NI.? N42.O %2.1 N2.9 45.3

6f 160001 28.9 31.5 35.1 37.1 3 7.q 38.9 39.7 NO0.N 41.3 NI.4 911.7 N2.0 9J2.1 N 2.9 95.3GE 1110001 28.9 31.5 35.1 37.1 37.9 38.9 39.7 N0.9 '41.3 41.41 Ni.? 42.0 N2.1 9s7.9 45.3B E 120001 28.94 31.5 35.1 37.3 37.7 39.2 39.9 40.b 91.5 91.6 92.0 92.2 N2.4 93.1 45.6

GE 100001 !0.4 336 37.21 39. 398 N.3 9. N.7 N7 9.0 N3 N.6 N. N5 N0B E 90001 31.8 5. 38.7 NO. 91.3 92.9 93.6 99.3 95.3 95:6 95.9 N6:2 96.3 N 7.0 N96GE 8000 35.6 39.3 N3 5 NS.? 96.3 98.0 99.1 N 9. 9 5 0. 9 521 A 1. S 1. 51A.8 52.6 55. 2GE 70001 36.9 90.9 9N.6 96.8 N7.N N

9 .1 50.2 51.0 52.0 5?.2 52.6 53.0 53.2 53.9 56.5

G E 6001 !6.9 90.9 1# 9.6b 96.8 N7.N1 99.1 50.2 51.0 52.0 S2.2 52.6 53.0 53.2 53.9 S6.5

GE 50001 39.2 92.7 97.2 99.9 SO.O 51.7 52.8 53.7 591.7 54.9 SS.9 55.8 56.0 56.8 59.9r' BE 45001 910.0 913.6 98.0 50.9 51.0 53.2 59.3 55.3 56.3 56.5 57.0 57.4 57.6 58.9 61.0

GE 910001 92.9 1#6.8 52.0 59.7 S5.3 57.8 S8.9 S9.9 61.1 61.5 61.9 62.3 62:7 63:9 66.0GE 35001 99.8 98.9 59.3 57.0 57.6 60.2 61.7 62.8 69.2 69.5 65.0 65:.9 65.8 66.5 69.1GE 30001 96.9 51.2 57.3 60.2 61.0 63.9 65.6 66.7 68.1 68.5 69.0 693 697 7.9 73.0

GE 25031 98.9 53.0 S9.41 63.1 63.9 67.1 69.0 70.9 71.8 72.2 72.7 73.2 73.5 74.3 76.8CGE 2COUl 50.9 55.5 62.3 66.6 67.7 71 .9 73.8 75.% 76.7 77.1 77.6 78.1 78.94 79.2 81.8

GE le00l 51.0 55.7 62.9 66.7 67.9 71.6 73.9 75.5 77.2 77.7 78.2 78.7 79.1 79.8 82.9GE 15001 S2.7 57.5 690.9 69.6 70.7 79.5 77.1 78.7 80.9 80.9 81.9 81.9 8Z.5 8 3.3 85.8GE 12001 S3.7 58.6 66.3 71.3 72.5 76.5 79.2 80.8 82.5 83.0 93.5 89.0 9.6 85.3 87.9

GE 10001 59.:9 60.2 68.0 73.0 74;3 78 .2 80.9 82.5 89.9 814.9 85.3 85.8 96.5 87.2 89.8C G 901 55. 607 68.5 73.5 791.8 78.:7 8 1.9 83:0 85.2 85.8 8.3 68 879 82 9J

GE 001 553 0.7 68.6 73.6 791.9 78. 81. 839 85.6 86. 867 8. 87. 897 91.3GE 7001 55.7 61.3 69.5 79.5 75.7 79.8 82.8 894.5 86.8 87.9 87.9 88.5 89.2 89.9 92.5

0) GE 6001 55.8 61.5 69.6 79.6 75. 9 80.2 83.1 89.9 87.3 87.9 88.91 89.1 sq.? 9 C.4 93.0

G E scOI 55.6 61.:6 69.8 79.9 ?6.1 80.5 83.6 85.3 87.8 88.9 88.9 89.5 90.3 91.0 93.6CGE 9 00 a 5.8 61.6 70.1A 7S.2 ?6. 6 81 . L 89.1 86.0 68.5 89.2 89.8 90.9 91.1 91.9 99.7

GE 3001 SS.8 61.6 70.2 75 .9 76.7 81.2 891.9 66.2 88.8 89.90 90.0 90.8 91.7 92.6 95.6GE 2001 S5.8 61.6i 73.2 75.9 76.7 81.2 89.9 86.2 91.9 89.5 90.3 91.1 92.5 99.1 97.8GE 1001 55.8 61.6 70.2 75.4 76.7 81.2 891.9 86.2 88.9 89.5 90.3 91.3 92.6 99.2 99.3

GE Q1 55.8 61.6 70.2 75.4 76.7 81.2 89.9 86.2 98.9 89.5 90.3 91.3 92.6 99.2 100.0.................................................................................................................................................


h1.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC SFROM HOURLY OBSERVATIONSAIR WEATHE'R; S[RVICEIMAC

STATION NUMBER: 035623 STATION NAms: RAF ALCGOBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT NOURSILSTI: 090o-IlO


' FEET | 160 90 60 60 Al 10 32 2N 20 16 12 10 a S 9 0

NO CEIL I 28.3 30.1 32.9 39.7 39.9 35.3 36.0 36.3 36.6 36.9 36.9 36.9 36.9 36.9 37.0

GE 200001 36.0 38.0 91.3 93.6 913.7 99.3 N509 95.6 96.1 46.3 46.3 96.3 96.3 46.3 96.7GE 160001 36.6 38.7 92.0 94.3 9N.4 95.0 96.1 96.3 46.a 97.1 7.1 97.1 97.1 4 7.1 N 7.4GE 160U01 16.6 38.7 92.0 4N.3 NN1.4 45o0 N6.1 46.3 46.8 47.1 47.1 97.1 7.1 97.1 47.4GE I 1ODI 36.8 38.7 92.0 49.3 99.9 N5.0 96.1 96.3 46.8 97.1 47.1 47.1 97.1 47.1 7.9GE 120001 37.1 39.0 92.4 4.7 44.8 45.9 96.5 46.7 47.2 4709 47.N %% 9 7 4 97 7.4 47.8

BE 100001 !9.6 91.7 5.0 47.3 N7. 48.0 49.5 49.8 50.3 50.5 50.5 50.5 50.5 50.5 50.9I GE 90GO 40.8 93.0 46.3 9.86 98.7 99.3 50.6 51.1 51.6 51.9 51.9 51.9 51.9 51.9 52.2

GE 600J. 46.2 98.5 52.2 59.7 59.9 55.6 57. 57.6 58.3 58.6 58.6 56.7 58.7 5e.7 59.0GE 7C9 97.0 50.2 54.0 56.5 56.6 57.4 58.9 59.4 60.1 60.4 60.9 60.5 60.5 60.5 60.8GE 60001 98.3 50.7 54.5 57.0 57.1 57.8 59.9 59.9 60.6 60.8 60.8 61.0 61.0 61.0 61.3

GE 501.09 49.6 52.0 56.0 56.6 58.7 59.9 61.0 61.4 62.3 67.5 62.5 62.6 62.6 62.6 63.0GE 95001 50.7 53.1 57.5 60.0 60.1 60.8 62.4 62.9 63.7 64.0 69.0 641. 69.1 69.1 694GE 900.2j 53.2 55.6 60.9 63.1 63.4 69.1 6S.6 66.1 66.9 67.2 67.2 67.3 67.3 67.3 67.7GE 35001 59.5 57.1 61.6 69.6 69.8 6505 67.2 67.7 68.5 66.7 66.T 68.9 68.9 69.9 69.2GE 30001 S7.2 60.6 65.9 69.0 69.2 70.1 72.0 72.5 73.9 73.7 73.7 73.8 73.8 73.8 74.1

GE 25001 58.9 62.3 67.7 71.7 72.3 73.9 75.3 75.8 77.C 77.2 77.2 77.9 77.9 77.4 77.7GE 200O&l 62.0 65.4 71.3 76.0 76.6 78.0 80.1 60.6 81.6 62.0 82.0 82.2 R2.2 82.2 62.5GE 16B0I 62.9 66.2 72.2 77.0 77.7 78.9 81.1 81.6 62.6 83.0 83.0 63.1 83.1 63.1 83.5GE 15001 69.6 66.l 7.4 79.4 80.1 61.7 84.0 89.4 85.6 65.9 85.9 66.0 86.0 86.0 86.3GE 12001 65.9 69.6 75.9 81.1 81.9 83.6 85.9 66.3 67.5 67.6 67.6 67.9 87.9 81.9 86.3

GE 10009 66.8 70.6 77.6 82.9 83.7 85.9 87.6 88.3 99.7 69.9 89.9 90.3 90.1 9'.I 90.0GE 91.09 67.2 71.1 78.1 6a3.9 64.2 85.9 88.3 68.7 90.2 90.9 90.4 90.5 90.5 9'25 90.9GE 8009 67.3 71.3 78.9 83.7 84.6 86.3 89.0 89.6 91.0 91.3 91.3 91.9 91.4 91.9 91.7GE 7..O 67.5 71.5 78.7 84.1 8.9 66.8 89.5 90.1 91.7 92.0 92.0 92.1 92.1 92.1 92.7GE 6009 67.5 71.5 78.7 89.1 85.0 67.2 69.9 90.5 92.3 92.6 92.7 92.8 92.6 92.8 93.19

GE soru 67.8 71.7 79.0 84.7 65.6 67.9 90.8 91.6 93.9 93.8 93.9 94.1 94.1 94.1 99.7GE N4j0l 67.9 71.9 79.2 85.0 66.0 68.4 91.6 92.6 94.5 95.0 95.2 95.9 95.6 95.6 96.2GE 3001 67.9 71.9 79.2 65.0 86.0 884 91.7 92.8 94.7 9.2 95.6 96.2 96.4 96.4 97.GE 2009 67.9 71.9 79.2 85.0 86.0 86.9 91.7 92.8 99.7 95.3 95.9 96.8 97.5 97.5 96.8GE loc0 67.9 71.9 79.2 65.0 86.0 86.9 91.7 92.8 94.7 95.3 95.9 96.8 97.5 97.5 99.8

GE 31 e7.9 71.9 79.2 85.0 66.0 89.9 91.7 92.8 99.7 95,.3 95.9 96.8 97.5 97.5 110.0

.................................................................................................................................................

TOTAL NUMBER OF OSERV8TIONS: 935

.Io

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEAIIER SERVIC(iMAC

STATION NUMBER: 035623 STATION NAME : RAF ALCOBURT UNITE) KINGDOM PERIOD OF RECORC: 77-86MONTH: OCT HOURSILSTI: 1200-1400.. .. .. .. .. .. .. .. ... .. .. .. .. .. .. .. .. .. .. ... ... .. ... .. ... .. .. ..... ................... ....

CEILING VISIBIL IT IN HUNDREDS of METERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 8 60 48 40 32 24 20 16 12 10 8 5 4 0...... ..... .......... ........... . . . . .. . . . .. . . . .. . . .... . .. . . . .. . ..... . o ..................

0 NO CEIL ! 0.4 31.9 34.1 34.3 34.3 30.8 35.1 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2

GE 20COI 140.4 42.3 44.6 45.1 45.1 %05,9 46.3 46.4 46.4 46.4 46.4 46.4 46.4 46.4 46.4GE 160001 40.9 42.8 45.1 45.6 4S.6 46.4 46.7 46.9 46.9 46.9 46.o 46.9 46.9 46.9 46.9GE 1600Gi 40.9 42.8 45.1 45.6 45.6 46.4 46.7 46.9 46.9 46.9 46.9 %0.9 416.9 46.9 46.96E 1410(I01 4D.

9 42.8 45.1 45.6 45.6 46.4 46.7 46.9 46.9 46.9 46.9 46.9 46.9 46.9 46,9

GE 120001 41.6 43.5 45.8 46.3 46-3 47.1 47.4 47.6 47.6 47.6 47.6 47.6 47.6 47.6 47.6

GE 100001 45.6 47.4 49.9 50.5 50.7 51.7 52:1 52:3 52:3 52.3 52.3 52.3 52.3 52.3 52.3G 90001 46.7 48.7 51.2 51.7 52. 53. 0 53.4 53.6 53 6 53.6 53,6 53. 6 53.6 53.6 53.6GE 80001 53.0 55.2 57.7 58.5 58.7 59.9 60.4 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6GE 70001 53.6 55.8 58.3 59.1 59.3 60.6 61.1 61.3 61.3 61.3 61.3 61.3 61.3 61.3 61.3

0 GE 60001 53.6 55.8 58.3 59.1 59.3 60.6 61.1 61.3 61.3 61.3 61.3 61.3 61.3 61.3 61.3

GE 5CGOI 55.0 57.2 59.7 60.5 6C.7 62.0 62.5 62.7 62.7 62.7 62.7 62.7 62.7 62.7 62.7GE 4500i 56.8 59.0 61.7 62.5 62.7 64.0 64.5 64.7 64.7 64.7 64.7 64.7 64.7 64.7 64.7GE 40001 61.4 63.8 66.6 67.7 68.1 69.6 70.0 70.5 70.5 70.5 70.5 70.5 70.5 70.5 70.5GE 35001 64.8 67.6 700.4 71.6 71.9 73.5 74.1 74.6 740.6 76.6 74.6 74.6 74.6 74.6 74.6GE 30001 71.2 741.6 78.0 79.4 79.7 81.5 82.1 82.5 82.5 82.5 82.5 82.5 82.5 82.S 82.5

GE 25001 73.5 ?7.2 80o5 82.1 82.4 84.1 84.7 85.2 85.2 85.2 85.2 85.2 85.2 86.2 85.2GE 2'3001 76.6 80.14 84.1 85.8 86.1 87.9 88.5 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9GE 18001 76.8 80.7 84.4 86.0 86.4 88.1 88.8 89.3 89.3 89.3 89.3 89.3 89.3 89.3 89.3GE ISU01 79.0 83.1 87.1 88.7 89.L 91.3 92.0 92.4 92.4 92.4 92.4 92.4 92.4 92.4 92.,4GE 12001 80.7 84.7 88.9 90.6 90.9 93.2 94.1 94.5 94.5 94.5 94.5 94.5 94.5 94.5 94.5

GE 1OM 80.7 84:7 89.5 91.1 91.5 93.8 94.9 95.3 95.3 95.3 95.3 95.3 95.3 95.3 95.30 GE 96a0I 81.0 85.1 89.9 91.5 91.8 94.2 91.2 95.7 95.8 95.9 95.9 95.9 91.9 95.9 95.9

GE 8UI 81.4 85.5 90.4 92.1 92.4 94.8 95.9 96.4 96.5 96.6 96.6 96.6 96.6 96.6 96.6GE 1001 81.7 85.9 90.9 92.5 92.9 95.2 96.4 96.9 97.0 97.2 97.2 97.2 97.2 97.2 97.2GE 6001 91.8 86.0 91.0 92.9 93.2 95.6 97.1 97.6 97.7 97.9 97.9 97.9 97.9 97.9 97.9

GE 5001 81.9 86:1 91.3 93.1 93.5 95.8 97.7 98.3 98.6 98.8 99.0 99.1 99.1 99.1 99.10 GE 41ou 81.9 86.1 91.3 93.1 93.5 95.8 97.7 98.4 98.7 99.0 99.2 99.3 99.3 99.3 99.3

GE 31.01 81.9 86.1 91.3 93.1 93.,5 95.8 97.7 96.4 98.8 99.1 99.3 99.4 99.4 99.4 99.4GE 2001 91.9 86.1 91.3 93.1 93.5 95.8 97.7 98.4 98.8 99.1 99.3 99,4 99.5 99.7 99.9GE 10(11 81.9 86.1 91.3 93.1 93.5 95.8 97.7 98.4 98.8 99.1 99.3 99.0 99.5 99.7 100.0

GE O 81.9 86.1 91.3 93,1 93.5 95.8 97.7 98.4 99.8 99.1 99.3 99.4 99.5 99.7 IC0.0

............................................................................................................................................

TOTAL NU9BER OF OSSEAVATIONS: 858

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE or CEILING VERSUS VISIBILITY

uSAFETAC FROM IHOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO-4BURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: OCT HOURSTLS7): 1500-1700

CE ILING VISIBILITY IN HUNDREDS OF METERS

IN i GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 48 90 32 29 20 110 A 5 9 0

NO CEIL i 27.3 28.1 29.8 30.5 30.5 30.9 31.1 31.1 31.1 31.1 31.2 31.2 31.2 31.2 31.2

GE 20 001 .8.5 40.2 92.3 93.1 43.1 43.6 93.9 43.9 43.9 93.q 99.0 99.0 94.0 49.0 44.0GE 180001 !8.7 40.4 42.6 93.4 43.4 93.9 99.1 99.1 44.1 RN .1 99.2 99.2 99.2 99.z 94.2GE 160G0O 38.7 90.9 42.6 93.9 43.4 93.9 94.1 44.1 99.1 99.1 44.2 49.2 99.2 99.2 99.2

GE 19c"-0 !8.9 90.6 92.8 93.6 93.6 99.1 99.3 99 *3 44.3 94.3 44.5 99.5 44.5 u.S 44.5

GE 120001 39.8 91.6 93.7 99.6 44.6 95.1 95.9 45.9 95.9 95.4 N5.5 45.S 95.5 45.5 N5.5

GE 100001 93.5 95.9 97.7 N8.5 98.6 49.2 99.6 99.6 49.7 99.7 99.8 99.8 99.8 99.8 99.8GE 90001 93.9 95.8 8.2 99.0 99.1 99.7 50.1 50.1 50.2 50.2 50.3 50.3 50.3 50.3 50.3GE 820I 50.8 52.9 55.7 56.6 56.7 57.7 58.0 58.0 58.2 58.2 58.3 58.3 58.3 58.3 58.3

GE 70U01 51.6 53.8 56.5 57.6 57.7 58.6 59.0 59.0 59.1 59.1 59.2 59.2 59.2 59.2 59.2

GE 6co 51.7 53.9 56.6 57.7 57.8 58.8 59.1 59.1 S9.2

59.2 59.9 59.9 59.9 59.4 59.9

GE SO3| 53.3 55.9 58.2 59.9 59.7 60.7 61.0 61.0 61.1 61.1 61.3 61.3 61.3 61.3 61.3GE 95LI 56.4 58.6 61.5 62.7 63.1 69.0 69.9 69.9 69.5 69.5 69.6 69.6 69.6 69.6 69.6

GE 40001 63.6 66.0 69.0 70.2 70.8 71.8 72.1 72.1 72.2 72.2 72.3 72.3 72.3 72.3 72.3GE 350,,1 68.3 71.2 79.9 75.8 76.9 77.9 77.7 77.7 77.8 77.8 77.9 77.9 77.9 77.9 77.9GE 3000I 73.9 77.9 80.9 82.5 83.1 89.3 89.6 89.6 89.7 89.7 89.9 89.9 89.9 89.9 89.9

GE 25UD0 75.4 79.3 83.0 89.5 85.1 86.9 86.8 86.8 86.9 86.9 87.0 87.0 87.0 97.0 97.0GE 21001 77.8 82.2 86.3 88.0 88.6 89.9 90. 2 90.2 90.3 90.3 90.5 90.5 90.5 9 1.5 90.5GE 18001 78.1 82.5 86.5 88.2 88.8 90.1 90.5 90.5 90.6 9C.6 90.7 90.7 90.7 9C. 7 90.7GE 15L0I 90.I 85.3 89.6 91.7 92.3 93.9 99.3 99.3 94.4 94.4 99.5 99.5 99.5 99.5 94.5GE l2 0l 81.8 87.0 91.9 99.3 95.0 96.7 97.0 97.3 97.4 97.4 97.5 97.5 97.5 97.5 97.5

GE 13U31 81.9 87.1 92.1 99.5 95.2 96.9 97.3 97.6 97.7 97.7 97.9 97.9 97.9 97.9 97.9GE 9oo 82.1 87.9 92.9 99.8 95.5 97.1 97.5 97.9 98.0 98.0 98.1 98.1 98.1 98.1 98.1GE 8(.01 82. 87.6 92.6 95.0 95.7 97.4 97.7 98.1 98.2 98.2 98.3 98.3 98.3 98.3 98.3GE 700 82.5 87.7 92.8 95.5 96.2 97.9 98.3 98.7 99.2 99.2, 99.3 99.3 99.3 99.3 99.3GE 6q,0 92.6 87.8 93.0 95.6 96.3 98.0 98.5 98.9 99.9 99.9 99.5 99.5 99.5 99.5 99.5

GE 5L.11 82.6 87.8 93.0 95. 96.3 98.0 98.5 98.9 99.9 99.4 99.5 99.5 99.5 99.5 99.5

GE 4001 82.6 87.8 93.1 95.7 96.9 98.1 98.6 99.0 .99.5 99.5 99.6 99.6 99.6 99.6 99.6GE 3001 82.6 87.8 93.1 95.7 96.9 98.1 98.6 99.0 99.5 99.5 99.6 99.6 99.6 99.6 99.6GE 2001 912.6 87.8 93.1 9S.7 96.9 98.1 98.6 99.0 99.5 99.5 99.6 99.6 99.8 99.8 IC.0

GE 13oC Z.6 87.8 93.1 95.7 96.9 98.1 98.6 99.0 99.5 99.5 99.6 99.6 99.8 90.8 1 :0.0

GE 31 82.6 87.8 93.1 95.7 96.9 98 .1 98.6 99.0 99.5 99.5 99.6 99.6 99.8 99.8 170.0

.......................................................................................................................

TOTAL NL8ER OF OBSERVATIONS: 839


AIR WEATHER SERVICEiMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO48URY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTP: OCT POURSILSTI: 18O0.-2jc

......................................................................... ..........................................CEILING VISIBILITY IN HUNDREDS Of METERS

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 AD 60 8 N0 32 24 20 16 12 10 8 5 4 0

o NO CEIL I 38.7 39.8 41.7 41.0 43.1 43.5 43.7 44.1 44.1 44.1 44.2 44.2 q4.2 44.2 44.6

GE 200001 S:4 47:5 49.7 51.0 51.2 51.7 52.0 52.5 52.5 52.5 52.7 52.7 S2.7 52.7 53.1* GE 183001 4.4 47.5 49.7 51.0 51.2 51.7 52.0 52.5 52.5 52.5 52.7 52.7 S2.7 52.7 53.1

GE 160001 95.4 47.5 49.7 51.0 51.2 51.7 52.D 5Z.5 52.5 52.5 52.7 52.7 52.7 52.7 53.1GE 1400OI 45.4 47.5 49.7 51.0 51.'2 51.7 52.0 52.5 52.5 52:S 52.7 52.7 52.7 52.7 53.1o GE 120001 46.1 48.2 50.3 51.7 51.8 52.4 52.7 53.2 53.2 53.2 53.3 53.3 53.3 53.3 53.8

GE 100001 48.86 51.2 S3.3 54.7 59.8 SS.4 55.7 56.2 56.2 56.2 56.3 56.3 56.3 56.3 56.8GE 90001 49.4 51.7 54.2 55.7 55.8 56.3 56.6 57.2 57.2 57.2 S7.3 57.3 57.3 57.3 57.7GE 80001 55.3 57.6 60.3 61.8 6179 62.5 62.8 63.3 63.3 63.3 63.4 63.4 63.4 63.4 63.8GE 70001 55.4 57.7 60.4 61.9 62.1 62.6 62.9 63.4 63.4 63.4 63.6 63.6 63.6 63.6 64.0

* GE 60001 5S.5 $7.8 60.6 62.1 62.2 62.8 63.0 63.6 63.6 63.6 63.7 63.7 63.7 63.7 64.1

GE 50001 56.6 58.9 61.7 63.2 63.3 63.8 64.1 64.7 64.7 64.7 69.8 64.8 64.8 64.8 65.2*0GE 45Q0 59.3 61.7 64.8 66:3 66.4 67.3 67:4 67.9 67.9 67.9 68.1 68.1 68.1 61 68.5

GE 40001 64.4 67.1 70.3 71.9 72.2 72.7 73.1 73.8 73 73.8 73.9 73.9 73.9 73.9 7.4GE 35001 681 71:5 74.6 76.3 76.5 77.2 77.6 78.3 78.3 78.3 78.4 78.4 78.4 7q.4 76.9bE 3000l 70 .8 75.4 79.1 80.9 81.2 82.0 82.5 83.2 83.2 83.2 83.4 83.4 83.4 83.4 83.8

GE 25001 72.4 77.4 81.2 83.1 839 842 84:7 85:4 85:4 85.4 85.5 85.5 85 85.5 85:9GE 20001 75.0 79.9 84.0 86.2 86:5 87.3 87.9 88.8 888 88.8 88.9 88.9 88.9 84.9 89.4GE 18001 75.4 80.9 84.4 86.6 86.9 87.7 88.3 89.2 899. 89.2 89.4 89.4 89.4 89.4 89.8GE 15001 776 83.4 87.9 90.5 9C'7 91.5 92.1 93.0 93.0 93.0 93.2 93.2 93.2 93.2 93.6

O GE 12001 78.3 84.0 88.9 92.1 92.4 93.2 93.7 94.7 94.7 94.7 94.8 94.8 94.8 94.8 95.2

GE 10001 79.5 85.3 90.5 93.6 94.0 95.0 95.6 96.6 96.6 96.6 96.7 96.7 96.7 96.7 97.10 GE 9001 79.9 8S.7 91.1 94.3 99.7 9S.6 96.3 97.3 97.3 97.3 97.4 97.4 97.4 97.4 97.8

GE 8001 80.4 86:1 91.5 99.7 95.1 96.0 96.7 97.7 97.7 91.7 7.8 97.8 97.8 9 7.8 98.2GE 7001 804 86.1 91.5 94.7 95.1 96.0 96.7 97.7 97.7 97.7 97.8 97.8 97.8 97.8 98.2GE 6001 40.5 86.2 91.8 95.0 9S.4 96.5 97.4 98.4 98.4 98.4 98.5 98.5 98.S 9.5 98.9

GE 500 40:6 86:9 92.0 95.2 95.6 96.7 97.7 98.6 98.6 98:6 988 98.8 98.8 94:8 99:2o GE 4001 80.6 86.4 92.0 9S.4 95.8 96.9 97.6 98.8 988 98.8 98. 9 9 8.9 989 99.3GE 3001 80.8 86.5 92.2 95.6 96.0 97.1 98.1 99.0 99.0 99.0 99.2 99.2 99.2 99.2 99.6GE 2001 90.8 86.5 92.2 95.6 96.0 97.1 98.' 99.0 .99.0 99•rl 99.2 99.2 99.2 99.2 99.9

0 GE lo 80.8 86.S 92.2 95.6 96.0 97.1 98.1 99,0 99.0 99.0 99.2 99.2 99.2 99.2 100.0

GE DI 90.8 86.S 92.2 95.6 960 97.1 98.1 99.0 99.0 99.0 99.2 99.2 99:2 99:2 100.0


-0

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREgUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCONBURV UNITED KINGDOM PERIOD OF RECORD: 77-06MONTH: OCT 14OURSILSTI: 2101-2300

.................................................................'..............................................................CEILINGVISIBILIY IN HUNDREDS OF METERS

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 48 10 32 24 20 16 12 10 8 5 0 D..........................................................................................................................................

NO CEIL I 42.9 11.9 117.0 7.9 8.1 4.9.0 49.5 49.6 50.2 50.2 50.2 509. 50e.1 5'.4 S0.8

GE 200001 16.0 118.1 50.5 51.5 51.6 52.7 53.1 53.4 53.9 53.9 53.9 541.0 54.2 54.2 54.7

GE 180001 6.0 116.1 50o.5 51.5 51.6 52.7 53.1 53., 53.9 53.9 53.9 51.0 S4.2 54.2 54.7GE 160001 16.0o 8.1 0.5 51.5 510.6 52.7 53.1 53. 53.9 53.9 53.9 541.0 54.2 54.2 51.7

GE 140001 16.0 18.1 50.5 51.5 51.b 52.7 53.1 53.11 53.9 53.9 53.9 511.0 51.2 54.2 54.7

GE 120001 46.0 18.1 50.5 51.5 51.6 52.7 53.1 53.11 539 53.9 53.9 511.0 51.2 511.2 54.7

GE 100001 19.3 51.8 541.2 55.1 55.3 56.5 56.9 57.3 57.7 57.7 57.7 57.9 58.0 58.0 58.5GE 93001 49.6 52.1 51S. 55.1 55.7 57.1 S7.6 57.9 58.3 58.3 58.3 58.5 58.6 53.6 59.1

GE 80001 53.1 556 56.2 59.1 59.11 60.8 61.2 61.5 62.0 62.0 62.0 62.1 62.3 62.3 62.?GE 7oul 53.6 56.0 58.6 59.5 59.8 61.2 6L.7 62.0 62.4 62.11 62.4 62.6 62.3 62.7 63.2

GE 60001 53.7 S6.2 58.8 59.7 60.0 61. 61.8 62.1 62.6 62.6 62.6 62.7 62.9 62.9 63.

GE Scol 565 58.9 61.8 62.7 63.1 611.1 611.9 65.2 65.6 65.6 65.6 65.8 66.0 66.0 66.14GE %SSLO 58.2 b0.9 b4.0 610.9 65.2 66.6 67.'0 67.3 67.8 67.8 67.8 67.9 68.1 68.1 68.5

GE '.o001 63.1 66. 69.5 70. 70o7 72.1 72.5 72.8 73.3 73.3 73.3 73.' 73.6 73.6 711.0GE 35001 65.8 69.2 72.2 73.1 73.1 71.8 75.3 75.6 76.0 76.0 76.0 76.2 76.3 76.3 76.8GE 30001 69.3 73.1 76.8 77.9 78.2 79.5 80.3 60.6 81.1 61.1 81.1 a1.2 81.4 81.4 81.8

GE 25001 72.8 77.1 81.2 82.6 82.9 84.3 85.2 85.5 86.0 86.0 86.0 86.1 66.3 86.3 66.7GE 29001 75.3 79.5 841.0 85.5 65.8 67.2 8.1 68.7 89.2 89.2 89.2 89.3 89.5 895 89.9GE 16001 S.11 79.7 81.1 85.6 86.0 87.3 88.2 88.9 89.3 69.3 69.3 89.5 89.6 89.6 90.1GE 1500 77.6 82.c 66.6 88.9 89.2 90.5 91.5 92.1 92.5 92.5 92.5 92.7 92.8 92.8 93.3

O GE 12001 76.2 82.6 87.6 90.1 90.5 91.9 92.8 93.'. 93.9 93.9 93.9 911.0 91.2 91.2 91.7

GE 11.U01 78.8 63.2 88.5 91.0 91.5 92.8 93.7 911.1 91.8 91.8 911.8 95.0 95.1 95.1 95.6" GE 91,01 80.0 61.11 89.8 92.2 92.7 94.0 95.0 95.6 96.0 96.0 96.0 96.2 96.3 96.3 96.8

GE 800l 10.0 811. 89.8 92.5 93.0 911. 95.3 95.9 96.3 96.3 96.3 96.5 96.6 96.6 97.1GE 7001 60.2 81.7 90.1 92.8 93.3 91.7 95.6 96.2 76.6 96.6 96.6 96.8 96.9 96.9 97.11

G[ 6001 80.2 81.9 90.2 93.0 93.11 95.0 95.9 96.5 96.9 96.9 96.9 97.1 07.3 97.3 97.7

GE 500| 80.2 81.9 90.2 93.0 93.11 95ed 96.0 96.6 97.1 97.1 97.1 97.3 97.11 97.1 97.9GE #ool 90.2 61.9 90.2 93.0 93. 95.1 96.0 96.6 '7.1 97.1 97.1 97.3 Q7.1 97.' 97.9GE 36ul 80.2 65.0 90.7 93.6 91.0 95.7 96.9 97.6 98.0 98.0 98.0 98.2 98.3 99.3 98.9

GE 2001 80.2 65.0 90.7 93.6 9.0 95.7 96.9 97.7 98.2 98.2 96.2 98.3 98.5 98.5 99.7

GE 1101 60.2 65.0 90.7 93.6 91.0 95.7 96.9 97.7 90.2 98.2 98.2 98.3 98.5 9k5 99.7

GE al 80.2 85.0 90.7 93.6 91.0 9S.7 96.9 97.7 98.2 98.2 98.2 96.3 98.5 98.5 11.0.0.......................... .................................. ..................................................................


* -,i l•U•l m t[]l•i i lIlll

GLOBAL CLINATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOUQLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4dBURY UNITED KINGDOM PERIOD OF RECORD: 77-66MONTH: OCT HOURStLSTI: ALL

CEILIN VISIBILITY IN HUNDREDS OF METERSIN | GT GE GE GE GE GE GE GE 6E GE GE GE GE GE GE GE

FEET I 160 90 60 60 98 490 32 29 20 16 12 10 8 5 9 0

NO CEL I 2.8 395 372 38.3 3. 5 39.3 39.7 90.0 40.2 90.3 960.5 0.6 90.7 0.8 1.9

GE 200005 39:4 91.5 94.5 45.9 96.1 47.0 47.5 47.8 96.1 98.2 98.4 95.5 98.6 98.7 49.4GE 180005 39 6 ,17 94.? 96.1 96.3 97.2 47.7 98.0 98.9 9.9 48.6 98.7 48.8 99.0 49.7GE 16OUO5 39.6 91.7 '1.7 u6.1 46.3 47.2 47.7 48.0 8.9 6.4 46.6 9807 4.6 99.0 99.7GE loco01 39.6 91.8 4.6 46.1 96.3 97.2 47.7 98.1 9.89 9.5 48.7 48.7 46.9 49.0 99.7

C' GE 120001 90.1 942.2 95.2 96.6 96.8 97.7 96.2 48.6 98.9 '9.0 49.2 99.3 99.9 99.5 50.2

GE 100001 92.7 95.0 98.0 99.4 497 50.6 51.2 51.6 51.9 52.0 52.2 S2.3 52.9 52.6 53.3GE 90101 93.6 4S.9 49.1 60.5 50.7 51.7 52.3 52.7 53.0 53.1 53.3 53.. 53.5 53.6 594.GE 8C00 98.3 50.9 59.3 55.8 56.1 57.2 57.8 58.2 58.6 $8.7 58.9 59.0 59.1 59.2 60.0

GE 700U1 99.0 51.6 55.0 56.5 56.8 57.9 56.6 58.9 59q9 59.5 59.7 59.8 59.9 60.0 60.6GE 6000 99.2 51.8 55.2 56.7 57.0 58:1 56.8 59.1 59.6 59.7 59.9 60.0 60.1 60.2 61.0

GE 50001 50.9 53.5 57.0 58.6 58.9 60:0 60.7 61.1 61.5 61:6 61:8 61.9 62.1 b2:2 62.9GE 95001 S2.7 S5. 59.2 60.7 61.1 62.3 62.9 63.3 63.8 63.9 69.1 69.2 69.3 69.5 65.2GE 40001 56.9 59.9 63.8 6S.6 66.0 67.3 67.9 68.4 68.9 69.1 69.3 69.9 69.5 69.6 70.9GE 35001 S9.6 62.6 66.9 68.7 69.1 '70.5 71.3 71.8 72.3 72.9 72.7 72.8 72.9 73.1 73.8GE 30005 63.1 66.9 71.5 73.5 79.0 75.6 76.5 76.9 77.5 77.6 77.8 77.9 76.1 7P.3 79.0

GE 25001 65.3 69.9 74. 76.6 77.1 78.6 79.6 60.9 61.0 61.1 81.3 61.9 81.6 81.3 62.50 GE 20005 68.1 72.9 77.8 803 80.9 62.7 83.9 69.6 85.2 65.9 85.6 65.7 8s.9 66.0 67

GE 18001 68.3 72.7 78.1 80.7 81.3 83.1 89.3 89.9 85.7 66.9 86.1 66.2 86.4 86.5 67.3GE 15005 70.9 75.1 60.9 63.7 89.'3 66.2 87.5 88.2 89.0 89.1 89.4 89.5 L-9.7 69.6 90.6

C. GE 12001 71.5 76.3 82.3 86.3 86.0 66.0 89.9 90.1 70.8 91.3 91.2 91.4 91.6 91.7 92.4

GE 1000| 72.1 77.0 83.'3 86.9 87.1 89.1 90:5 91.3 92.1 92.3 92.5 92.6 92.9 93.0 93.7" GE 9.0 72.5 77.9 83.6 86.9 67.6 69.6 91.0 91.8 92 7 92.9 93.1 93.3 93.5 9 36 99.3

GE 800 72.8 77.6 84.1 87.2 86.0 90.0 91.5 92.9 93.2 93.5 93.7 93.8 94.0 99.2 99.9GE 7005 72.9 77.9 69.9 87.6 88.4 90.5 92.0 92.9 93.9 99.1 99.3 99.6 99.7 99.8 95.6GE 6001 73.0 78.0 84.6 67.8 08.6 90.6 9209 93.3 99.3 99.6 94.8 95.0 95.2 95.3 96.1

GE 5001 13.1 78.1 89.7 88.0 88.8 91.1 92.9 93.9 95.0 95.3 95.5 95.7 95.9 96.1 96.6GE 4-05 73.1 78.2 84.8 88.2 89.0 91 .3 93.2 94.2 95.9 95.6 95.9 96.1 96.9 96.5 97.3GE 3005 73.2 78.2 89.9 88.3 89.2 91.5 93.5 99.5 95.7 95.9 96.3 96.5 96.8 97.0 97.9GE 2001 73.2 78.2 8.9 89.3 89.2 91.5 93.5 99.5 95.7 96.1 96.9 96.7 97.2 97.5 98.9GE 1GI 73.2 78.2 89.9 88.3 89.2 91.5 93.5 99.6 95.8 96.1 96.9 96.8 97.3 97.7 99.6

GE Gi 73.2 78.2 69.9 88.3 89.2 91.5 93.5 94.6 958 96.1 96.9 96.6 97*3 97.7 100.0

...................................................................................................................................................


-.J.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURPENCE OF CEILING VERSUS VISIBILITYUSAFETAc FROM POURLY OBSERVATIONS

AIR WEATIjER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 77,79,81-86

MONTH: NOV HOURSILSTI: 0000-020D......................................... ........ ; ...............................................................................

CEILING VISIBILITY IN HIUNDRES OF METERSIN GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

7L FEET 1 160 90 80 E0 88 80 32 28 20 16 12 10 8 5 8 0

NO CElL 33.1 33.5 34.1 35.8 36.4 37.0 37.7 38.5 38.9 38.9 38.9 39.1 39.1 39.1 39.5

GE 200001 35. 36.2 36.8 38.5 39.1 80.0 80.6 1.8 81.8 81.8 81.8 82.1 42.1 4 2.1 42.5GE 180001 36.8 36.8 37.8 39.1 39;7 80.6 81.2 42.1 82.5 42.5 82.5 82.? 82.7 .4?7 43.1GE 160001 '6.1 36.8 37.8 39.1 39.7 80.6 81.2 82.1 42.5 42.5 42.5 82.7 42.7 82.7 163.1

GE 140001 36.8 36.8 37.8 39.1 39.7 80.6 81.2 82.1 42.5 82.5 82.S 42.7 82.7 8o2.7 43.1.GE 120001 36.4 36.8 37.4 39.1 39.7 80.6 81.2 42.1 2.5 82.5 82.5 42.7 42.7 42.7 43.1

GE 100001 37.0 37.8 38.1 39.7 4C.4 41.2 42.3 83.3 43.7 83.7 83.7 83.9 83.9 43.9 4.4GE 9C00 I 7.2 37.9 38.5 80.2 80.8 81.6 82.7 83.7 48.1 88.1 88.1 88.8 88.4 4.4 .4.8GE 8COOl 80.8 81.0 81.6 83.3 83.9 48.8 85.8 46.9 87.3 87.3 87.3 87.5 87.5 7.5 47.9GE 70001 4C0.6 81.2 82.1 83.7 .44 85.2 46.2 87.3 87.7 87.7 87.7 87..9 47.9 47.9 88.3GE 60001 80.6 81.2 82.1 83.7 88.8 8S.2 86.2 87.3 87.7 87.7 47.7 47.9 87.9 47.9 8.3

GE 5C001 42.9 83.5 88.8 86 .4 87.1 87.9 49.0 50.0 50.8 5nf.4 50.4 50.6 50.6 53.6 51.0GE 45001 85.8 86.8 87.9 89.6 50. 51.5 52.5 53.6 54.0 58.0 58.0 58.2 54.2 54.2 54.6GE %0041 50.0 51.0 S2.7 58.6 558k 56:5 57.5 58.8 59.2 59.2 59.2 59. 59.8 59. 5908GE 35001 S3.6 55.2 57.1 59.0 59.8 60.9 61.9 63.z 63.6 63.6 63.6 63.8 63.8 6 8 68.2GE 30601 57.7 59.6 61.7 68.2 65.1 66.1 67.2 68.8 69.0 69.0 69.0 69.5 69.7 69.7 70.1

GE 2S001 60.7 62.8 68.6 67.2 68.2 69.2 70.3 71.5 72.2 7?2.4 72.8 72.8 73.0 73.0 73.8GE 20001 63.8 65.5 68.0 70.9 72.0 73.2 78.5 75.7 76.6 77.0 77.0 77.8 77.6 77.6 78.0GE 18001 68.8 66.5 69.0 72.0 73.0 78.3 75.7 77. 77.8 78.2 78.2 78.: 78.9 78.9 79.3

GE 1500: 66.9 69.2 72.0 75:1 76.2 77.8 78.9 80.1 81.0 81.8 81.8 81.8 82.0 8.0 82.4, GE 12001 68?6 70.9 73.8 77.0 786 79.3 80.8 82.0 82.8 83.3 83.3 83.7 83.9 83.9 88.3

GE 10001 69.5 72.0 18.9 78.0 79.3 60.8 82.2 83.5 88.3 88.7 88.7 85.1 85.9 8S. 85.8GE 9001 69.9 72.8 75.5 78.9 80.1 81.6 83.1 88.3 85.1 85.6 85.6 86.0 86.2 86.2 86.6GE 801 70.3 73.0 76-.4 79.9 81.2 82.6 84.1 85.8 86.2 86.6 86.8 87.2 87.8 87.8 88.1GE 7,a0l 70.7 73.8 77.0 80.S 82.0 83.5 88.9 66.2 87.0 87.8 87.7 88.3 88.5 88.5 89.1GE 6001 70.9 78.1 76.0 82.4 83.9 85.4 86.8 88.1 88.9 89.3 89.5 90.8 90.6 9C.6 91.2

GE soo1 70.9 78.3 78.7 83.5 88.9 86.8 88.3 89.S 90.4 90.8 91.6 92.7 92.9 92.9 93.7GE %j01 10.9 78.5 79.1 81.1 85.6 87.4 89.3 9Q.6 91.4 91.8 92.1 91.7 98.8 98.8 95.6GE 3001 70.9 711.5 79.3 88.3 86.0 88.3 90.6 91.8 92.7 93.1 93.9 95.0 96.0 96.2 97.3GE 2001 70.9 74.5 79.5 88.5 86.2 88.5 91.2 92.7 93.5 93.9 98.8 95.9 96.9 97.1 98.5GE 1001 70.9 78.5 79.5 88.5 86;2 88.5 91.2 92.7 93.5 93.9 948. 95.8 97.1 97.3 99.6

GE o1 70.9 78.5 79.5 88.5 86.2 68.5 91.2 92.i 93.5 93.9 984.8 95.8 97.1 9 7.3 100.0

.................................................................................................................................................


-J 2

........................ .. ... ..................

I"

1

GLBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY 0! OCCURRENCE or CEILING V ERSUS VISIBILITYUSAETA 1 O9sER3AT11N5AIR WEATHER SERVICEIMACroMI0LTOSRAON

: STATION NUMBER: 015623 STATION NAME: RAF ALCONBURT UN ITED KINGDOO PERIOD or RECORD: 77-SNi MONTH: NOV HOURS(LSTI: 03r0C-0500

....................... .... ........................................................

NO CEIL I 30.6 31.0 32.5 33.S 33.7 31T.6 35.0 3S.1 36.0 36.1 36.2 36.4 36.4 36.4 37.2

GE 2COD01 !3.6 34.0 35.5 36.5 36.8 37.7 38.2 38.3 39.1 39.3 39.4 39.5 39.5 39.5 40.4ClGE 180001 33.9 34.3 35.8 36.8 37.1 38 .0 38.4 38.6 39.4 39.S 39.1 39.8 39.8 39.8 40.6

GE 16CO01 33.9 34.3 35.8 36.8 37. 1 38.0 38.4 38.6 39.4 39.5 39.7 39.8 39.8 39.8 40.6GE 14F)D0l 33.9 34.3 35.8 36.8 37.1 38.0 38.4 38.6 39.4 39.5 39.7 39.8 39.8 39.8 40.6GE 120Ui 34.0 34.4 36.0 36.9 37.2 36.2 38.6 38.7 39.5 39.7 39.8 39.9 39.9 39.9 40.8

GE 100001 35.0 35:4 36.9 37.9 38.2 39.:1 39.7 39.:8 40:6 %n:8 40.9 41.0 4 1:0 41.0 41.9o G 9CO 35.8 36.2 37.7 38.7 39.0 39.9 40 5 40.6 415 41. 41 41 9 41.9 41.9 427GE 80001 37.9 38.3 39.8 40.8 41.0 42.0 42.6 42.7 43. 43.7 43.8 43.9 43.9 43.9 44.8G E 70001 38.2 36 402 41.:2 41:5 42.:4 43.0 43.1 139 . 9 5.1 44.2 44.4 44.4 44.4 45.2GE 60001 38.4 388 40.5 4. 15 1 7 42.7 43.3 43.4 44.2 4.4 44.5 44. 6 44.6 44.6 45.5GE 50001 41.2 41.9 43.5 44.6 44.9 45.9 46.4 46.6 47.4 4.5 47.7 47.8 47.8 47.8 48.6

QGE 40010 3.9 44.6 46.3 47.8 38.2 49.2 49.7 499 SO06 50.o8 109 11 51.1 11o 1.9

GE 40001 49.6 50.3 522 53.9 54.4 SS. 56.3 SN.5 57.3 57.4 57.6 57.7 57.7 57.7 58.5GE 35001 52.9 3:9 56:1 5717 58.3 59:2 602 0.3 61.2 61.3 61.4 61.6 61:6 61.6 6 2.4G 30001 57.4 58.7 61.2 62.8 63.4 64.3 65.7 66.1 67.2 67.4 67.5 67.6 67.8 67.8 68.6

GE 25001 60.2 61.6 641.3 66.0 66.5 67.6 69.0 69.7 70.8 71.1 71.2 71.3 71.5 71.5 72.3K GE 20001 63.8 65.3 68.5 70.4 70.9 72.0 73.4 74.2 75.3 75.6 75.8 75.9 76.0 76.0 76.9

GE 1800l 64.2 65.7 68.9 70.9 71."5 72.6 74.0 74.8 75.9 76.2 76.3 76.4 76.6 76.6 77.4GE 15001 67.8 69.4 72.6 74.7 75.2 76.4 77.8 78.7 79.8 80.0 80.2 80.3 0.4 8!.4 81.3GE 12001 30.4 72.3 75.6 77.7 78. 79.6 81.0 82.0 83.1 83.3 83.5 83.6 83.7 83.7 84.6

GE 10001 70.9 73.3 76.7 78.8 79.5 80.7 82.4 83.3 84.6 85.1 85.5 85.7 85.8 8 5.8 86.6GE 9001 72.3 71.8 78.4 80.4 81.1 82.5 84.3 85.3 86.5 87.1 87.5 87.6 87.7 8707 88.6GE 8001 72.7 7S.s 79.5 81.8 82.5 83.9 85.7 86.6 87.9 81.4 88.8 89.0 89.1 89.1 89.9GE 7001 72.9 75.8 79.8 82.1 82.8 81.6 86.4 87.3 80.6 89.3 89.8 89.9 90.1 90.1 90.9GE 6001 73.0 75.9 79.9 82.4 83.3 8S.3 87.1 68.0 89.3 89.9 90.8 90.9 91.0 91.0 91.9

GE 5001 73.3 76.2 80.3 82.8 83.7 86.0 87.7 88.7 89.9 90.8 91.6 91.7 92.0 9.,.0 92.8GE 4001 73.3 76.3 80.6 83.3 84.4 86.9 88.7 90.1 91.3 92.1 93.0 93.1 93.5 93.5 914.5GE 3001 73.3 76.3 80.7 83.6 84*8 87.5 89.5 90.9 92.1 93.0 93.8 93.9 914.6 94.6 96.7GE 2001 73.3 76.3 80.9 83.9 85.1 87.7 89.9 91.3 93.1 93.9 94.8 914.9 95.7 95,7 98.2G 1001 73.3 76.3 00.9 83.9 85.1 87.7 89.9 91.3 93.3 941.1 95.2 95.3 96.1 96.6 99.6

GE el 73.3 76.3 80.9 83.9 85.1 87.7 89.9 91.3 93.3 91.1 95.2 95.3 96.1 96.6 100.0

......................................................................................................................................................

TOTAL NUMBER or OBSERVATIONS: 726

4.

GLOBAL CLIMATOLOGV BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY'FSAE TAC FROM POURLY OBSERVATIONS

AIR WEAT ER SERvICE/IACSTATION NUMBER: 05623 STATION NAME: RAF ALCOMBURV UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH: NOV HOURSILSID: 0600-0800

CEILING VISIBILITY IN HUNDREDS Of METERS-IN G G! GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 2 160 90 a 60 98 90 32 29 20 16 12 10 8 5 0

o NO CEIL 1 26.0 27.0 28.3 28.6 29.0 29.9 30.6 30.9 31.7 32.1 32.1 32.1 32.1 32.1 33.19

GE 200001 29.6 30.9 32.7 33.9 33.8 39.3 35.1 36.0 36.9 37.3 37.3 37.3 37.3 37.3 38.6o GE 180001 29.7 31.0 32.9 33.5 33.9 39.9 35.8 36.1 37.0 37.6 37.4 37.9 31.9 17.4 38.7GE 160001 29.7 31.0 32.9 33.5 33.9 39.9 35.8 36.1 37.0 37.9 37.4 37.9 37.4 37.9 38.7GE 190002 29.7 31.0 32.9 33.5 33.9 39.9 35.8 36.1 37.0 37.9 37.9 37.9 37.9 37.9 38.7

C GE 120001 30.0 31.9 33.2 33.9 34.3 39.8 36.2 36.5 37.9 37.8 37.8 37.8 37.8 37.8 39.1

GE 100611 32.6 3,.2 360 36.6 37.0 37.5 39.0 39.2 40.1 90.5 60.5 40.5 90.5 17.5 41.8C GE 9000 33.2 39.9 36.0 37.0 37;8 38.3 39.9 90.1 41.2 91.6 91.6 91.6 91.6 41.6 92.9

GE 80011 37.0 38.8 90.8 91.19 91.8 92.3 43.9 99.3 4S.3 95.7 95.7 I5.7 .? 5.7 5.7 47.0GE 10002 37.7 39.6 91.6 2.2 92.6 93.1 9.7 95.1 96.1 96.5 6b.5 96.5 96.5 96.5 97.8

C GE 6000 37.7 39.6 91 .6 942.2 92.6 93.1 991.7 95.1 96.1 96.5 96.5 96.5 96.5 96.5 97.8

GE 50002 39.5 11.6 93.6 99.3 499.7 915.2 96.8 97.1 98.2 98.6 98.6 18.6 98.6 986 99.9C GE 950 91.7 99.0 96.9 97.3 97.7 98.3 99.9 50.3 51.3 SI.? 51.7 51.7 51. 5 1.7 53.0

GE 9OO2 98.3 50.6 53.0 53.9 59.3 55.1 56.9 r7.3 58.3 so .? 58.7 58.7 58.7 59.7 60.0GE 35r02 51.9 59.3 56.8 57.8 58 59 .0 60.9 61:3 62.3 62:7 62.7 62:7 62.7 62:7 69.0GE 30002 5S.3 S8.9 61.3 62.3 62.7 63.5 65.5 660 67 67. 9 67 9 67.9 67.9 679 69.2

GE 25002 57.9 61.6 69.5 65.6 66.0 66.8 68.7 69.9 70.8 71.3 71.3 71.3 71.3 71.3 72.6GE 20001 61.0 65.1 69.0 70.1 70.5 71.6 73.5 79.2 75.6 76.2 76.2 76.2 76.2 16.2 77.5GE 18002 61.9 65.5 69.9 70.8 71.2 72.3 79.3 19.9 76.9 77.0 71.0 77.0 77.0 77.0 78.3GE 15002 63.5 67. 71.8 73.2 73.8 75.1 77.3 77.9 77. 80.0 80.0 80.0 80.0 8 .0 81.3GE 12002 65.5 69.6 73.8 75.3 75.8 77.1 79.4 80.9 81.8 82.5 82.5 82.S A2.5 62.5 83.8

GE 1COO 66.6 71.0 75.3 76.9 77.9 78.8 81.2 62.2 83.9 89.8 89.9 89.9 89.9 89.9 86.2GE 9001 67.3 71.7 76.1 77.8 78.3 79.9 82.2 83.2 81.9 85.8 86.0 86.0 86.0 86.0 87.3GE 8.02 67.7 72.6 77.0 79.0 79.5 81.0 83.9 89.9 96.1 87.0 87.1 87.1 87.1 87.1 88.9GE 7001 67.8 72.9 77:3 79:2 79.9 81.8 89.3 85.3 87:1 Ap1 :82 88.2 88.2 A812 09:5G 6002 67.9 73.1 77.5 79.5 80.3 82.2 89.9 86.0 87.8 88.7 89.5 89.6 6 896 90.9

GE 5001 68.2 73.6 78.2 80.1 80.9 82.9 86.1 87.1 89.0 89.9 90.6 90.8 90.8 9 .8 92.2GE 91002 68.2 73.6 70.3 80.3 81.0 83.2 86.5 87.7 89.5 90.1 91.2 91.3 91.3 91.3 92.9GE 3002 2 736 78.3 05 81.3 83 86.9 88.2 90.3 91.3 92:1 92.2 92:3 92:3 95.7GE 2002 68.2 73.6 78.3 80.5 81.9 83.8 87.3 88.6 90.8 91.9 92.7 9.30 93.2 93.0 97.3GE 1001 68.2 73.6 78.3 80.5 81.1 83.8 87.3 88.6 90.8 92.1 92.9 93.2 93.9 99.3 99.7

GE AJ 68.2 73.6 180.3 8o5 81.9 83.8 87.3 88.6 90.8 92.1 92.9 93.2 93.9 99.3 1'0.0..................................................................................................................................................

TOTAL NUMBER OF OpSERVATIONS: 7?0

".. 0

J[

-• *1 -h-

2GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM H4OURLY OBSERVATIONSAI R WEATHER SERVICE/MAC


MONTH: NOV HOURSILSTI: 0900-ILOO

o/

CE ILING VISIBIL17Y IN HUNDREDS OF METERS~IN U T GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

OFEET I160 90 80 60 148 40 32 24 20 16 12 10 8 5 4 0

.1 NO CL I 25. 25.3 27. 28.2 28.2 28 .9 29.1 29.2 29.6 29.6 29.6 29.6 29.9 30.1 31.1

GE 200GO1 12.2 32.7 35.9 36.8 37.0 37.7 38.0 18.2 18.6 38.7 38.9 38.9 39.2 39.6 40.9GE 180001 32.3 32.8 16.1 37.0 37.1 37.8 38.1 38.4 38.7 38.9 39.0 39.0 39.4 39.7 41.0GE 16OU01 32.3 32.8 36.1 37.0 17.1 37.8 38.1 38.41 38.1 38.9 39.0 39.0 19.4 39.7 41.0GE 140001 32.7 33.2 36.5 37.3 37.5 38.2 38.5 38.7 39.1 39.2 39.4 39.4 39.7 40.1 41.4oGE 1213001 33.2 33.8 37.1 38.2 38.4 39.1 39.4 39.6 40.0 40.1 40.3 40.3 40.6 41.0 42.3

GE 100001 36.2 37.2 40.6 41.8 41.9 42.7 42.9 43.2 43.5 43.7 43.8 43.8 44.2 44.6 45.86 E 9000 1 37.5 38.5, 41.9 43.0 43.2 43.9 44.2 44.4 44.8 144.9 45.1 4501 45.4 4S.8 4 7.1GE 80001 41.8 42.9 46.6 47T.7 47.8 48.7 49.2 49.5 49.9 50.0 50.1 S0.1l S0.5 50.9 52.3GE 700331 4 3. s 44.7 48.4 149.5 49.6 50.5 51.0 51.3 51.6 51.8 51.9 51.9 52.3 52.7 S4.1GE 60O1 W3. 7 44.8 4AB.5 49.6 '49.1 50.6 51.1 51.4 53.8 51.9 52.0 52.0 %2.% 5 Z.8 54.2

GE 50001 44.9 46.3 50.0 51.1 51.4 62.3 52.9 53.2 53.5 53.7 53.8 53.8 54.2 54.6 55.9GE 45001l 47.1 48.6 52.5 53.9 54.2 55.1 55.8 56.1 56.5 56.6 56.7 S607 57.1 57.5 58.9GE liC40 10 51.0 52.5 56.6 58.1 58. 4 59.2 60.4 61.0 61.4 61.5 61.6 61.6 62.0 62Z.4 63.8GE 35001 54.4 55.9 60.3 62.2 624 6.3 6. 5. 56 657 6. 65.8 66.2 66.6 68.0

KGE 30001 59.1 60.6 64.9 66.8 67. 68.1 69.4 70.0 70.5 70.6 70.8 70.8 71.1 7 1.5 72.9

GE 25001 61.4 63.3 68.0 10.0 70.3 71.3 72.5 73.2 73.7 73.9 74.1 74.1 74.4 74.9 76.3*GE 20001 63.2 65.1 70.3 72.7 72.9 74.1 75.3 75.9 76.5 76.7 76.8 76.8 77.2 71.7 79.1

GE 18031 63.5 65.4 70.6 73.2 73.5 74.7 75.9 76.6 77.1 77.3 77.5 77.5 77.8 78.4 79.7GE 15001 65.9 68.1 73.4 76.2 T6.8 78.1 79.4 80.0 Boos 80.8 80.9 80.9 81.3 8 1.8 83.2GE 12001 66.8 69.2 74.8 77.8 78.9 80.3 81.9 82.? 83.2 83.4 83.5 83.5 93.9 84.4 85.8

GE lgol 67.6 70.1 75.9 79.1 8G. 3 81.6 83.3 84.1 85.1 85.3 85.6 85.6 85.9 86.5 87.8GE 9001 68.1 70.9 76.8 80.1 41.31 82.8 84.4 85.7 06.3 86.6 86.8 86.8 87.2 87.7 89.1GE 8901 68.6 71.4 77.3 80.6 81.8 83.4 85.1 85.9 87.0 87.2 87.5 87.5 87.8 88.4 89.7GE 7001 68.9 71.8 77.7 81.0 82.2 84.1 8s.8 86.7 87.7? 88.0 88.2 88.2 88.7 89.2 90.6GE 6001 68.9 7 1.9 77.8 81.3 82.5 84.4 86.3 87.2 88.4 88.9 89.1 89.1 89.6 9 %1 91.5

GE S001 88.9 71.9 78.0 81.4 82.8 84.? 86.6 87.5 89.1 89.6 90.0 90.0 90.5 93.0 92.4GE 4001I 68.9 71.9 78.0 81.41 82.9 8.9 87.0 87.8 89.7 90.4 90.8 90.8 91.3 91.9 93.3GE 1001 68.9 71.9 78.0 81.% 82.9 88.9 87.3 88.9 90.9 91.8 92.4 92.4 93.0 93.8 96.7GE 2001 68.9 71.9 78.0 81.4 82.9 88.9 87.3 89.0 91.3 92.2 93.3 93.4 94.3 95.2 98.6GE 1001 68.9 71.9 78.0 81.41 82.9 88.9 87.3 89.0 91.3 92.2 93.3 93.41 94.6 95.8 100.0

GE 01 68.9 71.9 78.0 @1.% 82.9 881.9 87.3 89.0 91.3 92.2 93.3 93.4 914.6 95.8 100.0.............................................................................................. ..............................................

TOTAL NUMBER OF OBSERVATiONS1 790

II

oGLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSA T AC FROM HOURLY OBSERVAIONSAIR WEA HER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURV UNITED KINGDOM PERIOD OF RECORD: 71-86MONTH: NOV HOURSLSTI: 1200 1 40

CEILING VISIBILITY IN HUNDREDS OF METERSIN 1 G GE GE GE GE GE GE Gs GE GE GE GE GE GE GE GE

FE ET 9 160 90 80 60 '98 '*0 32 2N 20 16 12 10 B 5 4 0

NO CEL 9 25.9 26.5 27.7 28.0 26.1 28.3 28.6 28.6 28.7 28.7 28.7 28.7 28.8 2a.8 29.0

GE 200001 35.3 36. 37.9 38.1 38.2 38.5 38.7 39.0 39.1 39.2 39.2 39.3 39.4 3. .1 39.8G 18009 3.1 372 38.6 188 39.0 1392 39.' 19.7 39.8 39,9 39.9 *00 410.2 - 1.2 '405GE 160001 !6.1 37.2 38.6 38.8 39.0 39.2 39.4 39.7 39.8 39.9 39.9 100.0 '0.2 4,.2 '0.5GE 19001 36.4 37.5 39.0 39.2 39.3 39.6 39.8 ]O.0 40.2 '*0.3 N0.3 e0.4 4O. 40.5 N0.9GE 120GO 37.0 38.1 39.6 39.8 39.9 NO.2 140.9 N0.7 4O.8 4n.9 40.9 N1.O '1.1 '*1.1 1.5

GE 100001 39.9 N 211 N27 92:9 4*3.1 N3:3 N3:5 4*3:8 3:9 4N.0 '4': 0 4*N:1 N903 '*94 3 NN.6o GE 90001 NO,7 92.1 '3.7 '3.9 N4o l*3 44eS '948 4N.9 '5.0 95.0 '*5.1 '.5.2 95.2 5*6GE 80009 '6.2 '7.6 49.3 '9.6 99.8 50.3 50.5 50.8 50.9 51.0 51.0 51.1 51.3 51.1 51.6GE 70GOI '7.5 '9.1 51.0 51.3 51.5 52.1 52.'4 52.6 52.7 52.8 52.8 53.0 S3.1 51.1 53.'.GE 60001 '*7.6 '9.3 51.3 51.5 51.-7 52.4 52.6 52.8 53.0 53.1 53.1 53.2 53.3 53.3 53.7

GE Sf'OOl '8.6 S0.5 52.6 52.8 53.1 53.7 53.9 54.2 54.3 5N. 54. 54.5 54.6 54.6 55.0C GE '5001 50. 52. 54.4 59.6 5.9 55.9 S6.3 56.6 56.7 56.8 56.8 56.9 57.1 57.1 57.

GE '*0001 55.0 57.1 59.2 59.6 60.0 61.2 61.9 62.1 62.2 62.4 62.' 62.5 62.6 62.6 63.0GE 35oDa1 579 60.2 6Z.5 62.8 6'3.2' 6.' 65.1 65.4 65.5 65.6 6S.6 65.7 65.9 65.9 66.2

_ GE 30001 62.8 65.7 68.6 69.0 69.5 10.7 71.7 71.9 72.1 72.3 72.3 72.4 72.5 72.S 72.9

GE 25001 65.5 68. 71.3 71.7 72.3 73.5 74's. 7N.9 75.2 753 75.3 75. 75.5 7c.,5 75.9GE 2CIjO 67.8 70o.9 74N7 75.N 76.1 77 .' 78.5 78.9 79-1 79.3 79.3 79.'. 79.5 79.5 79.9GE 18009 67.8 71.0 79.8 75.6 76.'. 77.7 78.8 79.1 79.1. 79.5 79.5 79.6 79.7 79.7 80 1GE 15009 71.' 7'.8 78.6 79.9 80.6 82.1 83.6 AN .1 8.., 0.6 89.6 84.7 8'*.8 8 .8 15.2

C GE 1200I 73.0 76.6 81.1 82.'* 83.1 8* .7 86.5 87.0 87.6 87.7 87.7 87.8 87.9 87.9 88.3

GE 10009 73.7 77.3 81:8 831 83.8 85.N 87.2 87.7 88.5 88.7 88.7 88.8 88.9 A89 89.3GE 900 79*8 78.5 83.0 89.3 85.0 86.9 88.7 89.3 90.2 9005 90.5 9016 90.7 9'.7 91.1GE 8009 7.99 780.6 83.1 8N.' 85.3 87.2 89.1 89.7 90.8 91.1 91.1 91.2 91.3 91.3 91.7

GE 709 75.2 79.0 83.7 85.6 86.9 88.9 91.0 91.6 92.8 91.0 93.0 93.1 93.2 93.2 93.6GE 6001 75.2 79.1 83.8 85.8 87.0 89.0 91.2 91.8 93.1 93. 93.' 93.5 93.6 93.6 94.0

GE 5009 75.Z 79.1 83.8 85.8 87.0 89.3 91.8 92.'. 9'*.2 9.6.6 9'.b 94.7 941.8 94.8 95.2GE 4U0 75.2 79.1 83.8 85.8 87.0 89. 91.9 92.5 9N.6 99.9 95.2 95.3 95.' 95.4 95.8GE 3001 75.2 79.1 83.8 85.8 87.0 89. 91.9 92.5 94.9 95.5 96.3 96.5 96.6 96.7 97.6GE 2001 75.2 79.1 83.8 85.8 87.0 89.. 91.9 92.5 95.2 96.0 96.7 97.3 97.5 97.7 98.9GE 1009 75.2 79.1 83.8 85.8 87.0 89.. 91.9 92.5 95.2 96.0 96.7 97.3 97.5 97.7 99.9

hE 01 75.2 79.1 83.8 85.8 87.0 89.0 91.9 92.5 95.2 96.0 96.7 97.0 97.5 97.7 100.0.... ... .... ... .... ... ... .... ... .... ... .... ... ... .... ... .... ... .... ... ... .... ... .... ... .... ... ...


.. ....2,em m m ~ l mi l

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VFRSUS VISIBILITYUSAFETAC FROM HOUQLy OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 77-66MONTH: NOV HOURSLSTI: 1500-1700

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. . . .... ......" "" 0 0 0 0 0 " "I E S....... . ... " 0 0 00 , 0

CEILING VISIBILITY IN HUNDREDS OF METERSIN I 61 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 60 60 liB 10 32 24 20 16 12 10 B 5 4 0

NO CEl I 26.3 26.9 27.6 281. 20.1. 2a.6 2B.7 26.6 29.1 29.1 29. 29.2 29.2 2.?29.2

6E 200001 32.1 33.2 34.2 35.0 35.0 35.1. 35.5 35.9 36.2 36.2 36.0 36.4 36.40 36.1. 36.1* GE 1800 72.1 33.2 39.2 35.0 35.0 35.1. 35.5 35.9 36.2 36.2 36.1 36.14 36.1 36.1 36.4

GE 160001 32.1 33.2 39.2 35.0 35.0 35 .1 35.5 35.9 36.2 36.2 36.1 36.1 361.4 36.1 36.1GE 190001 32.2 33.3 39.3 35.2 35.2 35.5 35.6 36.0 36.1 36.1. 36.5 36.5 36.5 36.5 36.5GE 120001 33.2 39.3 35.3 36.1 36.1 36.5 36.6 37.0 37.3 37.3 37.5 37,5 37.5 37.5 37.5

GE 100001 36.7 37.9 39.2 10:0 40.0 0.5 1.0:6 41:1 11.5 15 16 116 11.6 41.6 1.1.6G 9o000 37.0 38.1 39.9 10 6 1C, a8 1.3 1.1.5 419 1.2.3 12.3 1e21 1 2.1 12.4 1 2.1 1.2.4GE 80001 1.1.9 1..0 46.2 17.6 17.9 18.5 18.6 49.1 19.5 49.5 1.9.6 19.,6 19.6 49.6 19.6GE 70001 13.2 15.2 17.5 19. 19.2 19.6 19.9 50.. 50.B 50.8 50.9 50.9 50.9 52.9 50.9

* GE 60001 43.1 95.5 17.6 19.3 19.5 50.1 50.2 50.7 51.0 51.0 51.2 51.2 51.2 512 51.2

GE 55G0 1.4.7 416.9 19.3 50.9 51.0 51 .B 51.9 52.1 52.7 52.7 52.8 52.6 52.8 52.8 52.8GE 1.5003 96.6 19.3 52.0 53.8 53.9 51.7 55.0 55.5 55.9 55.9 56.0 56.0 56.0 56.0 56.0GE 90001 51.6 S91. 57.2 59.2 59;3 60.0 60.5 61.0 61,3 61.3 61.5 61.5 61.5 6i.s 61.5GE 35009 5S 56.9 62.3 64.5 614.7 65.6 66.2 66.8 67.3 67.3 67.4 67.4 67.1. 67.1 67.1.GE 33001 61.9 65.7 69.7 71.9 72.2 73.2 73.8 74.S 75.0 75.0 75.2 7S.Z 75.Z 76.2 7S.2

GE 25001 63:2 67.3 ?1:5 73.9 74.3 75.3 75.9 76.6 77.1 77:1 77.2 77:2 77.2 77.2 772f GE 20001 66.6 71.2 75.9 78.3 766 8000 60.6 61.7 62.2 62.2 823 82.3 82.3 87.3 62.3

GE 14001 67.3 71.6 76.04 788 79.3 80.6 61.6 62.. 62.9 82.9 83.0 83.0 83.0 83.0 83.0GE ISCOI 69.6 74.2 79.2 81.8 82.3 83.6 69.6 85.S 65.9 85.9 86.3 86.3 86.3 86.3 86.3GE 12001 70.9 75.6 61.1 84.0 61.6 65.9 66.9 68.1 88.6 88.6 89.0 89.0 69.0 89.0 89.0

GE 10001 71.6 76.5 82.3 6S.6 86.3 67.9 69.0 90.2 90.7 9f707 91.2 91.3 91.1 91.1. 91.GE

9nlI 71.9 76.8 82.9 86.2 67.0 88.6 89.6 91.0 91.5 91.5 92.0 92.1 92.2 92.2 92.2

GE 600l 71.9 77.0 63.0 66.3 87.2 68.7 90.1 91.3 91.9 91.9 92.1 92..5 92.6 92.6 92.6GE 7001 72.0 77.1 83.2 86.4 87.1 69.1 90.7 92.0 92.6 92.7 93.2 93.3 93.5 93.5 93.5GE 6001 72.1 77.3 83.1 66.7 87.6 69.3 91.2 92.5 93.1 93.2 93.8 93.9 94.1 94.1 94.1

GE 5001 72.2 77.5 83.6 66.9 87.9 69.6 91.4 92.8 93.6 93.7 94.3 9%.5 94.7 94.7 94.7GE %00J 72.2 77.5 63.6 66.9 87.9 89.7 91.6 93.2 94.1. 95.3 95.9 96.2 96.1 96. 96.1GE 3001 72.10 77.6 63.8 67.0 880 89.0 91.9 93.3 94.9 96.!) 96.8 97.8 97.9 97.9 96.1GE 2001 72.4 77.6 83.6 67.0 88.0 69.8 91.9 93.3 94.9 96.1 97.1 981. 96.5 96.7 98.6GE loci 72.1. 77.6 63.8 87.0 86.0 89.8 91.9 93.3 94.9 96.1 97.1 981. 96.5 99.6 99.8

GE 01 72.1 77.6 63.6 67.0 88.0 69.8 91.9 93.3 99.9 96.1 97.1 96.1 98.5 99.6 100.0

..................................................................................................................................................


. ... . ... . . .i4 @- wi l i /

GLOBAL CLIHATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITY

USAFETAC FROM HOUQLV OBSERVATIONSAlR WEATHER SERVICE/MAC

STATION NUMBER. 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONT.: NOR HoURSILSTI: 1801-2U00

.............................................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN ' 61 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GESFEET I 160 90 80 60 48 40 3 ZR 20 16 1? 10 8 5 4 0

NO CEIL | 31.9 32.9 35.4 36.1 36.5 36.7 36.8 36.8 37.1 37.1 37.1 37.1 37.Z 37.2 37.4

GE 200001 35.1 36.1 39.3 40.3 40.7 41.2 41.4 41.4 41.7 41.7 41.7 41.7 41.9 41.9 42.0GE 180001 35.j 36.1 39.3 40.3 4 0.7 41.2 41.4 41.4 41.1 41.7 41.7 41.7 41.9 41.9 42.0

GE 16000 35:1 366.1 39.3 40.3 40.7 41.2 41.4 41.4 41.7 41.7 41.7 41.7 41.9 41.9 42.0GE 14o0001 35.1 36.1 39.5 40.4 40;9 41.3 41.6 41.6 41.9 41.9 41.9 41.9 42.0 42.0 42.1GE 120001 35.3 36.2 39.6 40.6 41.2 41.6 41.9 41.9 4 42.1 42.1 42.3 47.3 42.4

GE OOU01 37.5 38.9 42.3 43.3 43. B 44.2 44.5 44.8 45.1 45.1 45.1 45.1 45.2 45.2 45.4GE 9C001. 37.9 39.3 43.1 44.1 44.7 45.1 45.4 45.6 45.9 45.9 45.9 45.9 46.1 46.1 46.2GE 8 l001 40.0 42.0 46.5 47.8 48.3 R48.7 49.0 49.3 49.6 49.6 49.6 49.6 49.7 49.7 49.9GE 70001 40.9 42.8 47.3 48.6 49.2 49.6 49.9 50.1 50.' 50.4 50.4 50.4 50.6 51.6 50.7GE 60001 41.0 43.0 47.5 48.7 49.3 49.7 50.0 50.3 50.6 50.6 50.6 50.6 50.7 50.7 50.8

GE 50001 42.1 446.4 48.9 50.4 51.0 51.4 51.7 52.0 52.2 52.2 52.2 52.2 52.4 52.4 52.5GE 14S01 44.7 47.1 51.7 53.2 53.9 54.4 54.6 54.9 55.2 55.2 55.2 55.2 55.3 55.3 55.5GE 40601 51.3 53.7 56.3 59.8 60.5 61.1 61.5 61.8 62.1 62.1 62.1 62.1 62.2 62.2 62.4GE 350I 56.6 59.1 647 66.3 67.0 67.6 68.0 68.3 68.7 68.7 68.7 687 68.8 69.0 69.1GE 3col 65.3 67.8 73.9 75.4 76.1 76.7 77.4 77.7 78.5 78.5 78.5 78.5 78.7 78.8 78.9

GE 25001 6707 70.8 77.0 78.5 79.2 79.8 80.8 81.0 81.9 61.9 81.9 81.9 82.0 82.2 82.3GE 2t001 70.2 73.3 80.2 82.0 83.0 83.6 84.6 84.8 85.7 85.7 85.7 85.8 86.0 86.1 86.2GE 18001 70.2 73.3 80.2 82.0 83.0 83.6 85.0 85.3 86.1 86.1 86.1 86.2 P6.4 86.5 86.7ZE 15001 72.2 75.3 82.6 814.4 85.5 86.2 87.6 87.9 38.8 89.8 88.8 88.9 89.0 89.2 89.3GE 12601 73.7 77.1 85.0 86.9 88.1 89.0 90.4 90.7 91.6 91.6 91.7 91.9 92.0 92.1 92.3

GE 10001 74.2 77*5 85.7 87.8 88.9 89.9 91.3 91.6 92.4 93.0 93.1 93.4 93.5 93.7 93.8GE 9001 74.3 77.7 85.8 87.9 89.0 90.0 91.4 91.7 92.6 93.1 93.3 93.5 93.7 91.8 94.0GE 800 74.3 77.9 86.1 88.2 89.3 90.3 91.7 92.0 92.8 93.5 93.7 94.0 94.1 94.2 94.4GE 70,1 74.3 78.2 86.4 88.5 89.6 93.6 92.0 92.6 93.4 946.1 94.2 94.5 947 94.8 94.9GE 6001 714.3 78.2 86.4 89.5 89.6 90.6 92.1 92.7 93.5 94.2 94.4 94.7 94.8 94.9 9S.1

GE Soot 1.3 78.2 86.4 88.5 89.6 90.6 92.1 92.7. 93.5 94.2 94.4 94.7 941.8 94.9 95.1GE '00t 74.3 78.2 86. 88.6 89.7 9.7 92.3 93.0 94.0 94.7 94.8 95.1 95.2 95.4 95.5GE 3001 74.3 78-2 86.4 88.6 89.7 90.7 92.6 93.8 95.2 95.9 96.2 96.9 97.1 97.2 97.3GE 2001 74.3 78.2 86.4 88.6 89.7 90.7 92.7 94.1 95.5 96.? 96.6 97.3 98.0 94.2 98.5GE 1001 71.3 78.2 86.4 80.6 89.7 90.7 92.7 941.1 95.5 96.3 96.8 97.6 98.5 98.9 99.7

GI .. 743 78.2 86.4 89.6 89.7 90.7 92.7 491.1 95.5 96.3 96.8 97.6 98.5 98.9 100.0

TOTAL NUMBER OF OBSERVATION5: 712

-Io

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURPENCE OF CEILING VERSUS VISIBILITYt5AF TA C FROM MOUqLY OBSERVATIONSAIR MEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITED KINGOOM PERIOD OF RECORD: 77-86MONT": NOV NOURSILSI: 2100-230..... .... .... .... .... .... .... .... .... ;.... .... .... .... .. 5. ..;. ... .... .... .... ........ .....

CEILING VISIBILITY IN HUNDREDS OF METERSIN IDG GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 so 60 98 90 32 29 20 16 12 10 8 5 9 0...................................................................................................................................................

- NO CElL ! 13.3 33.6 36.5 37.5 38.1 38.* 38.8 38.8 39.6 39.7 39.7 39.7 39.7 90.1 %C.3

GE 200001 !7:4 37.7 91.0 92.2 92.9 93.5 9.1 99.2 95.0 95.1 95.1 95:1 5 1 9.5 95.7GE 180001 37.9 37.7 91.0 92.2 92.9 93.5 99.1 99.2 95.0 95.1 95.1 95.1 951 95.5 A5.7GE ICOOI 37.9 37.7 91.0 92.2 92.9 93.5 99.1 99.2 95.0 95.1 95.1 95..1 95.1 95.5 95.7GE 119301 371. 37.7 41.G 92.2 2.9 93.5 99.1 99.2 95.0 95.1 95.1 4S.1 954.1 .5 5.7G -E 120001 37.9 37.7 91.2 92.3 93.2 93.8 49.9 99.5 95.3 99.9 N 5.9 95.9 95.9 9 5.8 4b.0

GE 100001 39.1 39.9 92.9 99.1 95.0 9S.S 96.1 96.6 97.3 97.9 479 97.9 97.4 47.9 98.0GE 9CUOl 39.9 90.1 93.6 99.8 95.7 96.3 96.9 97.3 98.0 98.2 98.2 9.2 eZ 9q6 98.8GE 81001 93.9 93.9 97.9 99.3 50;2 50.9 51.5 52.0 52.7 52.8 52.8 52.8 521.8 53.3 53.4GE 70001 99.1 99.7 98.6 50.1 50.9 51.7 52.3 S2.7 53.6 53.7 53.7 53.7 53.7 59.2 59.jv E 60001 99.9 95.0 98.9 50.9 51.2 52.0 52.6 53.0 53.9 54.0 54.0 59.0 59.O 59.5 59.6

GE 5'100 95.08 96.6 50.7 52.1 53.0 53.7 59.3 59.7 55.6 55.8 55.8 55.8 55.8 56.2 56.9_ GE 95001 98.9 99.6 53.7 55.2 56.1 56.8 57.9 57.8 58.'7 58.8 58.8 58.8 58.8 59.3 59.91

GE 90001 59.6 55.3 59.6 61.0 61.9 62.9 63.5 63.9 69.8 65.0 65.0 65.0 65.0 b5.9 65.8GE 35001 57.6 59.1 63.6 65.1 66.1l 67.2 68.0 68.6 69.5 69.6 69.6 69.6 69.6 77.1 70.7GE 30001 60.9 62.8 67.3 68.9

7C.2 71.2 72.9 73.0 73.9 79.0 79.0 79.2 79.2 79.6 75.2

GE 2S OI 65.9 67.6 72.1 73.9 75.2 76.2 77.9 78.0 78.8 79.] 79.1 79.9 79.9 79.9 PC.GE 206. 68.8 70.9 75.8 77.5 78.8 80.1 81.5 82.0 82.9 83.1 83.2 83.5 83.5 89.2 89.8GE 1800l 68.9 71.1 75.9 77.7 79.0 80.9 81.9 8?.s P3.4 83.5 83.6 83.9 F3.9 89.7 85.3GE 15601 70.1 72:8 78.8 80.7 82.0 83.8 85.3 85.8 96.7 86.9 87.0 87.3 87.3 8.0 88.6GE 120C 72.1 796 80o6 b 82.5 83.8 85.5 87.2 67.7 88.6 88.8 88.9 69.2 89.2 89.9 90.5

GE 10001 72.9 79.9 80.9 82.9 9.9 86.1 87.9 88.8 99.6 89.8 89.9 90.2 90.2 9T.9 91.5" GE 9001 73.0 75.5 81.5 83.5 85.0 86.7 88.6 89.5 90.9 90.5 90.7 90.9 90.9 91.7 92.3

GE 80oi 733 75.9 81.9 89.2 85.7 87:9 89:3 9.2 91:1 91:9 91.7 92.0 92.0 92:7 93.9GE 7OU1 73.9 76.6 82.8 65.1 86.6 886 gos 91.9 92.3 92.6 93.0 93.3 933 99.0 99.7

-. GE 6001 73.9 76.6 83.1 85.9 86.9 88.9 90.8 91.7 92.6 92.8 93.3 93.6 93.6 99.3 95.0

GE 5001 73.9 76.6 83.2 A5.7 87.2 89.2 91.1 92.0 92.8 93.3 93.9 99.2 99.5 95.2 96.1GE 9u01 73.9 76.6 83.9 06.1 87.6 89.09 91.8 92.7 93.6 99.0 99.6 99.9 05.5 96.2 97.1GE 3001 73.9 76.6 83.,9 86.1 87.6 89.8 92.1 93.0 93.9 9%.5 95.2 95.5 96.1 96.8 98.1GF 2001 73.9 76.6 83.9 86.1 87.6 89.8 92.1 93.0 93.9 99.5 95.5 9S.8 96.6 97.9 99.0GE ,1GO 73.9 ?6.6 83.9 86.1 87.6 89.8 92.1 93.0 93.9 99.s 95.5 9s.9 96.9 97.7 100.0

GE 11 73.9 76.6 83.9 86.1 87.6 89.8 92.1 93.7 93.9 99.5 95.5 95.9 96.9 97.7 100.0............................................................................................................................


-I.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM FOUqLY OBSERVATIONSAIR EAIHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: NOV HOURSILSTI: ALL


IN I GT GE BE GE GE GE GE GE 6E GE GE GE GE GE GE GEFEET i 160 90 80 60 8 90 32 29 20 16 12 10 B 5 N 0

NO CEIL I 28.6 29.2 30.9 31.6 31.9 32.3 32.7 32.9 33.5 33.9 33.9 33.5 33.b 33.6 34.1

GE 200001 33.7 39.5 36.6 37.5 37.8 38 .3 38.8 39.1 39.6 39.7 39.7 39.8 !9.9 4 T.0 40.6GE 18001 33.9 311.7 36.6 37.7 380 38.6 39.0 39.3 39.8 39.9 NO.0 40.0 90.1 9 T,2 '1OGE 160001 33.9 39.7 36.A 37.7 38.0 38.6 39.0 39.3 39.8 39.9 90.0 90.0 90.1 % C.2 90.8

GE 190001 31.1 39.9 36.9 37.8 38.1 38.7 39.2 39.4 39.9 9rl 90.1 90.2 40.2 9 '.3 90.9GE 120CO 39.9 35.3 37.N 38.3 38.6 39.2 39.7 39.9 40.; C.

5 N0.6 40.6 90.7 4C.8 91o9

GE 100001 !6.7 37.7 39.9 90.8 41.2 91.7 92.3 92.6 93.1 93.3 93.3 93.9 43.4 N 3.5 99.1GE 91001 37.9 38.5 ICO .7 Ni.7 92.0 N2.6 93.1 N3.5 44.L, 49.1 44.2 NV.2 99.3 94.9 95.0GE 8UOl 91.2 92.5 95.0 96.1 96,5 7.2 97.8 98.1 98.7 4P.8 98.8 98.9 49.0 .12 99.6GE 7!)OU 1 92.1 913.9 9 6.1 97.2 97.5 98.2 98 9 9.2 9.7 49.9 499 50.0 50.0 50:1 50:7GE 6000| NZ.3 93.6 96.3 97.3 N7.7 98. 9 99.0 99.9 99 50.0 50.1 50I 50.2 50.3 so9

GE 50O1 J 93.8 1S.9e 18.1 99.3 99.7 50.9 51.0 1.3 51.9 52.0 52.1 52.1 52.2 52.3 52.9GE 45001 96.2 97.9 50.8 52.1 52.S 53.3 5%.0 59.9 59.9 55.0 55.1 55.1 55.2 55.3 55.9

GE 9CO01 51.5 53.3 56.3 57.6 58.1 59.0 59.9 60.9 60.9 61.0 61.1 61.1 61.2 bl.3 61.9

GE 35001 55.1 57.2 60.6 62.0 62.6 63.5 69.5 69.9 655 6S.6 65.7 65.7 65.8 65.9 66.6

GE 3r001 60.2 62.6 66.3 67.8 68.9 69.9 70.5 71.1 71.8 72.0 72.0 72.1 72.2 72.3 73.0

GE 250al 62.8 65.5 69.9 71.0 71.6 72.6 73.7 74.9 7S.1 75.3 75.1 7S.5 75.6 75.7 76.9

GE 20001 65.7 68.5 73.0 79.8 75.5 76.6 77.9 78.5 79.3 79.5 79.6 79.7 79.8 80.0 80.6

GE 18001 66.0 60.9 73.3 75.2 75.9 77.1 78.5 79.1 79.9 80.1 80.2 80.3 90.9 80.6 81.2GE 1.Gal 68.5 71.6 76.3 78.9 79.2 80.5 81.9 82.6 83.9 83.6 83.7 83.8 83.9 89.1 89.7GE 12001 70.2 73.9 78.9 80.6 81.5 82.8 89.9 85.2 86.0 86.2 86.9 86.5 86.6 86.8 87.9

GE 10001 70.9 79.2 79.9 81.7 82.6 89.0 85.7 86.5 87.5 87.9 88.1 88.2 88.9 88.5 89.2

GE 9UO 71.5 74.9 80.2 82.6 83.5 85.0 86.7 87.6 88.6 89.0 89.2 89.3 89.5 89.6 90.36E 800 71.7 7.9 60.7 83.2 89..2 8S.7 87.9 88.3 89. 89.8 90.0 90.2 93.3 90.5 91.1GE 7io 72.0 75.7 81.1 83.7 89.8 86.5 88,3 89:3 90.3 90:8 91.1 91.2 91:4 91.6 92:2

GE 600 72.0 75.9 81.9 89.1 85.2 86.9 88.9 89.8 90.9 91.1 91.8 92.0 92.2 92.3 93.0

GE 5003 72.1 76.0 81.6 89.9 85.S 87.9 89.9 90.9 91.6 92.2 92.7 92.9 93.1 93.3 94.0GE GO 72.1 76.0 81.7 8#.6 V.7 87.7 89.9 91.0 92.94 93.0 93.6 93.8 99.1 99.3 95.1GE 3001 72.1 76.1 81.8 89.7 85.9 87.9 90.3 91,S 93.1 93.9 99.6 95.0 95.4 9S.? 97.2

GE 2005 72.1 76.1 81.8 89.7 86.0 88.0 90.5 91.7 93.5 99.9 95.2 95.7 96.3 96.6 98.5

GE fOOl 72.1 76.1 81.8 89.7 86.0 8s.0 90.5 91.7 93.5 99.9 9s.3 9S.9 96.6 97.1 99.8

GE 01 72.1 76.1 81.8 89.7 86.0 88.0 90.5 91.7 93.S 99. 9S.53 95.9 96.6 97.1 100.0

............................................... ...................................................................................................


J

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-78t,81-86

MONTH: DEC HOURS(LSTI: 0000-0200

CE IL ING VISIBILITY IN HUNDREDS OF METERS

IN | GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0

NO CEIL ! 1. 33.8 37.8 39.0 39.2 39.4 39.6 39.8 39.8 39.8 40.0 40.0 40.5 40.5 41.7

GE ZOO| 33.4 36.1 40.2 41.5 41.7 41.9 42.1 442.3 42.3 42.3 42.5 42-5 42.9 42.9 44.2GE 180001 33.4 36.1 40.2 11.5 41.7 41.9 42.1 42.3 42.3 42.3 42.5 42.5 42.9 4 2.9 44.2

GE 1600031 33.4 36.1 40.2 41.5 41.7 41.9 42.1 42.3 42.3 42.3 42.5 42. 5 42.9 42.9 44.2GE 1N4001 33.4 36.1 4o02 41.s 41.? 41 .9 42.1 42.3 42.3 42.3 42.5 42.5 42.9 42.9 44.2GE 120001 33.8 36.5 40.7 41.9 42.1 42.3 42.5 42.7 42.7 42.7 42.9 42.9 43.4 4 3.4 44.6

GE 100001 35.1 37.8 41.9 43.2 43.4 43.6 43.8 44.0 44.0 44.2 44.4 44.4 44.8 44.8 46.1- GE 9 DO1 35.3 38.0 42.1 43.6 43.8 44.0 44.2 144.4 44.6 44.8 45.0 45.0 45.4 45.6 146.9

GE 80001 40.0 42.7 46.9 48.3 48.5 49.0 49.2 49.4 49.6 49.8 50.0 50. 0 50.4 50.6 51.9GE 70001 41.3 44.0 48.1 49.6 49.8 50.2 50.4 50.6 50.8 51.0 51.2 51.2 51.7 51.9 53.1GE 60001 41.3 44.0 46.3 49.8 50.0 50.4 50.6 50.8 51.0 51.2 51.5 51.5 51.9 52.1 53.3

GE 5nO01 42.7 45.4 49.8 51.2 51.5 51.9 52.1 52.3 52.5 52.7 52.9 52.9 53.3 5 3.5 54.8

GE 45001 42.? 46.1 50.4 52.1 52.3 52.7 52.9 S3.1 53.3 53.s 53.7 53.7 54.1 54.4 55.6

GE 40001 47.9 S1.5 55.8 58.1 58.3 58.7 58.9 59.1 59.3 59.5 59.8 59.8 60.2 60.4 61.6GE 35001 51-0 54.6 59.1 61.4 61.6 62.4 62.7 62.9 63.1 63.3 63.5 63.5 63.9 64.1 65.4

I GE 30001 55.8 60.0 65.4 67.6 67.8 68.9 69.1 69.3 69.5 69.7 69.9 69.9 70.3 7C,5 71.8

GE 25001 59.3 63.5 68.9 71.6 71.8 72.8 73.0 73.2 ?3.4 73.7 73.9 73.9 74.5 74.7 75.9GE 20001 61.8 66.0 72.2 74.9 75.1 76.1 76.3 76.6 76.8 77.0 77.2 77..2 77.8 78.0 79.3

GE 18001 62.0 66.2 72.4 75.1 75.3 76.3 76.6 76.8 77.0 77.2 77.4 77.4 78.0 78.2 79.5

GE 15001 63.7 67.8 74.7 77.4 77.6 78.6 78.8 79.0 79.3 79.5 79.7 79.7 80.3 80.5 81.7GE 12001 6.7 69.3 76.3 79.0 79.3 60.5 80.7 80.9 81.1 81.3 81.5 81.5 R2.2 82.4 83.6

GE 10009 64.9 69.5 76.6 79.3 79.5 80.7 80.9 81.1 81.3 81.5 81.7 81.7 P2.4 82.6 83.8. GE 9001 65.1 70.3 77.8 80.5 80.7 82.0 82.2 82.4 82.6 82.8 83.0 83.0 83.6 83.8 R5.1

GE 8001 65.6 71.0 78.8 81.5 81.7 83.2 83.4 83.6 83.8 84.0 84.2 84.2 P4.9 A5.1 86.3GE 7001 66.4 71.8 79.7 82.6 82.8 84.2 84.4 84.6 84.9 85.3 85.5 85.5 86.1 86.3 87.6GE 6001 66.4 72.2 80.9 84.0 84.6 86.3 86.7 86.9 87.3 67.8 88.0 88.0 88.6 88.8 90.0

GE 500 66.8 72.8 81.5 85.1 85.7 87.8 88.6 89.0 89.6 90.0 90.2 90.2 90.9 91.1 92.SGE 0ol 67.0 73.7 82.4 8S.9 86.7 88.8 90.0 90.5 91.3 91.7 91.9 91.9 02.5 92.7 94.2

GE 'col 67.0 73.7 82.6 86.1 86.9 89.0 90.7 91.7 92.9 93.4 93.6 93.6 94.6 94.8 96.5GE 2001 67.0 73.7 82.6 86.1 86.9 89.0 90.7 91.7 92.9 93.4 94.2 94.2 95.4 95.6 98.8GE 1001 67.0 73.7 82.6 86.1 86.9 89.0 90.7 91.7 92.9 93.4 94.4 94.4 95.6 96.1 99.4

GE 01 67.0 73.7 82.6 86.1 86.9 89.0 90.7 91.7 92.9 93.4 94.4 94.4 95.6 96.5 100.0

O.. . ..MBER OF .OBSERVATIONS....... 4 ,Z., •. . . . . . .


GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVAIIONSAIR WEATIHER SERVICE/MAC

STATION NUMBER: U35623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH: DEC POURSILSTI: 0302-0500.. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . ..... ...............o........ ele . e e. D . e o l .... ........

CEILING VISIBILITY IN HUNDREDS OF METERSIN G1 GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEE I 160 90 80 60 48 40 32 24 20 16 12 10 8 5 4 0.. .. . ........ e . .e ..... ....... ..ee . •. .. . . . . ...... e..........e... . . .. . . .. . . .. . . .. . . .. . . .. . .

NO CEIL 29.7 31.9 34.6 35.4 35.4 35.5 35.9 36.1 36.1 36.1 36.1 36.2 36.2 36.6 37.3

UE 20001 52.8 35.0 37.8 38.6 38.6 38.8 39.2 39.3 39.3 39.3 39.3 39.6 39.6 400 41.1GE 181001 !3.1 35.4 38.2 39.1 39.1 39.2 39.6 39o7 39.7 39.7 39.7 40.0 40.0 4C.4 41.5GE 1br'Ul 33.1 35.4 38.2 39.1 39.1 39.2 39.6 39.7 39.7 39.7 39.7 40.0 40.0 41.4 41.5GE 14COOl ?3.1 35.4 38.2 39.1 39.1 39.2 39.6 39.7 39.7 39.7 39.7 40.0 40,0 4 -. 4 41.5GE 120001 '3.2 35.5 38.4 39.2 39;2 39.3 39.7 39.9 39.9 39.9 39.9 40.1 40.1 40.5 41.6

GE 100001 33.8 36.1 39.1 39.9 39.9 40.3 40.4 40.5 40.5 40.5 40.5 43.8 40.8 41.2 42.3GE 91G0I 34.3 36.6 39.6 40.4 40.4 40.5 40.9 41.1 43.1 41.1 41.1 41.4 41.4 41.8 42.8GE 8C001 38.0 40.3 43.2 44.1 44.1 44.3 44.7 44.9 44.9 44.9 44.9 45.1 45.1 45.5 46.8

GE 7C 00 38.5 40.9 43.9 44.7 44.7 4S.0 45.4 45.5 45.5 45.5 45.5 45.8 45.8 46.2 47.4GE 60 0 !8.9 41.5 44.9 45.7 45.7 45.9 46.4 46.5 46.5 46.5 46.5 46.8 46.8 47.2 48.4

GE 5001 41.4 43.9 47.6 48.5 48.5 48.8 49.2 49.3 49.3 49.5 49.5 49.7 49.7 5f.1 51.4GE 45001 42.7 45.8 49.5 $0.4 50.4 50.8 51.2 51.4 51.4 51.5 51.5 51.8 51.8 52.2 53.4GE 40c0o 46.1 49.3 53.5 S4.6 54.6 55.1 55.5 55.7 55.7 55.9 55.8 56.1 56.1 56.6 57.8GE 35GG 49.2 52.6 57.0 58.2 58.2 58.8 59.5 59.6 59.6 59.7 59.7 60.0 60.0 61.5 61.8GE 3!001 53.0 56.8 62.0 63.2 63.2 64.1 64.7 65.0 65.0 65.1 65.1 65.4 65.4 65.9 67.2

GE 2Go01 57.0 60.8 66.9 68.4 68.6 69.5 70.1 70.4 70.4 70.5 70.5 73.8 70.8 71.4 72.6

GE 20001 60.7 64.7 71.6 73.2 73.5 74.5 75.1 75.4 75.4 75.7 75.7 75.9 75.9 76.5 77.7GE 18001 60.8 64.9 71.8 73.4 73.6 74.6 75.3 75.5 75.5 5.8 75.8 76.1 76.1 76.6 77.8GE Io01 62.2 66.4 734 75.1 7S.4 76.6 77.3 77.7 77.7 78.0 78.0 78.2 78.2 78.8 80.0GE 12GO 64.3 68.8 76.4 78.4 78.6 79.9 80.7 81.1 81.1 81.4 81.4 81.6 81.6 8 2.2 83.4

GE 1703 65.3 b9.9 78.6 80.7 8C.9 82.2 83.0 83.4 83.4 83.6 83.6 83.9 83.9 84.5 85.?GE 9001 65.4 70.1 79.2 81.2 81.5 82.7 83.5 83.9 83.9 84.2 84.2 84.5 84.5 8.0 86.2GE R00l 65.7 70.4 79.6 81.6 81.9 83.1 83.9 84.3 84.3 84.6 84.6 84.9 84.9 8 .4 8b.6

GE 7UJ 66.1 70.8 40.0 82.3 82.6 83.9 84.9 85.3 85.3 85.5 85.5 85.9 85.9 86.5 87.7GE 6001 66.2 70.9 80.7 83.1 83.4 84.9 85.8 86.2 46.4 86.6 86.6 87.0 87.0 87.6 88.8

GE 5LUI 66.4 71.4 81.2 83.9 84.6 86.2 87.4 87.8 88.1 88.4 88.4 88.8 88.8 8 9.3 90.5GE 400 66.5 71.8 81.6 84.6 85.4 87.3 88.6 89.5 q9.9 97.1 90.1 90.5 90.7 9.2 92.4GE 3011 66.5 72.0 82.3 85.0 85.8 87.7 89.2 90.5 90.9 91.2 91.2 91.6 91.8 92.6 95.1GE 2GOI 66.5 72.C 92.2 85.1 85.9 87.8 89.3 90.9 91.6 91.9 91.9 92.4 92.8 93.6 97.0GE IGa 86.5 72.0 82.2 85.1 85.9 87.8 89.3 90.9 91.6 91.9 91.9 92.7 93.8 94.9 99.5

GE 0t 66.5 72.0 82.2 85.1 85.9 87.8 89.3 90.9 91.6 91.9 91.9 92.7 93.8 9S.3 100.0•............. ..... .... . ... • .... .. ...... .... . .. .. e... . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .

t0TAL NUMSER OF OSERVATIONS: 740

0.l

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM POURLY OBSERVATIONSAIR MEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC HOURS(LSTI: 06030600


* FEET I 160 90 80 60 98 NO 32 24 20 16 12 10 8 S 9 0................................................................. ............................................................

NO CEIL I 27.8 29.3 30.8 32.3 32.A 32.8 33.3 33.9 33.6 33.7 33.7 33.9 39.0 34.0 39.0

GE 20CO01 31.4 33.4 35.2 36.8 36.9 37.3 37.9 38.0 38.3 38.A 38.9 38.5 38.6 38.6 39.0GE 18001 I 31.4 33.5 35.3 36.9 37.0 37.A 38.0 38.1 38.4 38.5 38.5 38.6 38.8 39.8 39.1GE 160001 31.9 33.5 35.3 36.9 37.0 37.4 38.0 38.1 38.9 38.5 38.5 38.6 3T88 38.8 39.1GE 1400D1 31.9 33.5 35.3 36.9 37.0 37.4 38.0 38.1 38.9 38.5 38.5 38.6 38.8 38.8 39.1GE 120001 31.9 33.5 35.3 36.9 37.0 37-4 38.0 381 38.9 38.5 38.5 38.6 38.8 39.8 39.1

GE 10C000 32.5 34.6 36.9 38.0 380.1 38.5 39.1 39.2 39.5 39.6 39.6 39.7 39.9 39.9 40.2* GE 90o01 32.6 39.7 36.6 38.1 38.3 38.6 39.2 39.4 39.6 39.7 39.7 39.9 90.0 4 M.0 90.3

GE 8COI 35.9 38.3 90.1 41.8 42.1 92.4 93.2 43.3 93.5 93.6 93.6 43.8s 43.9 4 %9 49.3GE 70001 37.2 39.5 41.3 43.0 93.3 43.6 94.9 44.5 94.7 49.9 49.9 45.0 95.1 9 %.1 4S.5

- GE 60001 37.7 40.0 41.8 43.5 43.8 49.1 44.9 45.0 45.2 45.4 95.9 45.5 95.6 9S.6 96.0

GE 50001 39.2 41.7 93.5 45.5 95.7 46.1 46.8 46.9 47.2 97.3 47.3 97.4 47.6 47.6 47.9GE 95001 91.6 94.0 46.0 48.0 48.3 48.8 99.5 99.6 99.9 50.0 50.0 50.1 50.2 51.2 50.6GE 90009 95.6 98.0 50.2 52.9 52.7 53.7 54."6 59.8 55.1 55.3 55.3 55.4 55.5 55.5 55.9GE 33001 98.9 51.6 54.0 56.4 56.6 57.6 58.6 58.7 59.0 59.2 59.2 59.3 59.9 54.4 59.8GE 30001 52.9 56.2 59.0 61.S 61.7 62.7 63.7 63.9 69.5 69.7 64.7 69.8 64.9 64.9 65.3

GE 2500: 56:6 60:9 63:6 66.3 66.5 67.5 68:S 68.7 69.3 69.6 69.6 69.7 69.8 64.8 70.2GE 2COUI 59.0 63.2 6709 70.2 70.8 72.5 73.5 7142 74.9 75.2 75.2 75.3 75.9 71.1 75.8GE 18001 59.7 63.8 68.1 71.1 71.8 73.5 7'.4 75.2 75.9 76.2 76.2 76.3 76.4 76.4 76.8GE 15001 61.6 66.4 71.0 79.2 79.8 76.5 77.5 78.2 79.0 79.2 79.2 79.3 79.5 74.5 79.8GE 1ZU01 63.3 68.2 73.5 76.8 77,5 79.5 80.8 81.5 82.3 82.5 82 5 82.6 82.8 82.8 83.1

GE 10001 69.4 69.6 75.3 78.9 79.6 81.8 83.1 83.9 89.6 84.8 89.8 85.1 85.2 85.2 85.6GE 9003 65.0 70.2 76.3 80.0 80.7 82.9 84.2 85.0 85.8 86.1 86.1 86.9 86.6 81.6 86.9GE 8oa 66.3 71.4 77.5 81.2 82.0 84.2 85.6 86.3 87.2 87.9 87.4 87.8 f87.9 8 7.9 88.3GE 70 66.9 72.0 78.9 82.0 82.9 85.2 86.7 87.7 88.6 88.9 88.9 89.2 89.9 89.4 89.7GE 6009 66.9 72.0 78.9 82.0 82.9 85.2 86.7 87.7 h8.6 88.9 88.9 89.2 89.4 89.4 89.7

GE 5001 67.5 72.7 79.3 83.0 84.0 86.6 88.4 89.6 90.7 91.0 91.0 91.3 91.4 91.% 91.0GE 9001 67.8 73.1 79.7 83.5 89.5 87.3 89.6 90.8 92.1 92.3 92.3 92.7 92.8 92.9 93.5GE 3o01 67.8 73.1 79.7 83.5 84.5 87.3 89.6 90.8 22.2 92.9 92.4 92.8 93.9 93.9 94.6GE 2GO1 67.8 73.1 79.7 83.5 84.6 87.9 89.7 91.1 92.9 93.3 93.9 99.4 95.1 96.0 98.2

* GE 1001 67.8 73.1 79.7 83.5 84.6 87.9 89.7 91.1 92.9 93.3 93.9 99.S 95.9 96.2 99.9

GE 01 67.8 73.1 79.7 83.5 84.6 87.9 89.7 91.1 92.9 93.3 93.9 99.5 95.9 96.S 100.0

...........................................................................................................................

TOTAL NUMBER OF 085CR VATIONS: 818

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYLSAFETAC FROM HOURLY OBSERVATIONSAIR WEA1HE SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCORBURY UNITED KINGDOM PERIOD OF RECORD: 77-86

MONTH: DEC HOURSILSTI: 0900-1100

...........................................................................................................................CEIL ING VISIBILITY IN HUNDREDS OF METERS

IN I GI GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET J 160 90 80 60 48 140 32 24 20 16 12 10 8 5 4 0

NO CEIL I 23.5 25.0 26.6 27.6 27.8 29.0 29.7 29.8 29.9 29.9 30.0 30.0 30.0 30.0 30.0

GE 20o001 29.6 31.3 33.5 34.6 34.9 36.0 36.7 37.0 37.Z 37.2 37.3 37.3 37.4 37.4 37.7GE 180001 29.8 31.6 33.7 34.9 35.1 36.3 37.0 37.2 37.4 37.4 37.6 37.6 37.7 37.7 37.9GE 160001 29.8 31.6 33.7 314.9 35.1 36.3 37.0 37.2 37.4 37.4 37.6 37.6 37.7 37.7 37.9

GE 14 001 29.9 31.7 34.0 35.2 35.4 36.6 37.3 37.6 37. 37.8 37.9 37.9 38.0 38.0 38.3- GE 120001 30.2 31.9 34.3 35.6 35.8 37.0 37.7 37.9 38.1 38.1 38.3 38.3 38.46 39.4 38.6

GE 100001 31.9 33.7 36.2 37.4 37.7 39.0 39.7 39.9 40.1 40.1 40.3 40.3 40.4 40.4 40.6GE 90001 32.4 34.2 36.6 37.9 38;1 39.4 40.1 40.4 40.6 1.6 403.7 40.7 40.8 47.8 41.1GE 8CO

I 37.8 39.8 42.6 44.1 44.16 15.9 46.6 46.8 47.3 47.49 47.5 47.7 47.8 47.8 48.0

GE 70001 38.7 40.7 43.9 45.4 45.9 47.2 i7.9 48.1 48.6 48.7 48.8 48.9 49.1 49.1 49.3GE 60001 38.7 40.7 43.9 45.5 46.0 47.4 48.1 48.4 48.8 48.9 49.1 49.2 49.3 49.3 49.5

GE 50GoI 39.9 11.9 45.1 46.8 47.3 48.7 q9.4 49.6 50o.1 S0.2 50.4 50.5 50.6 50.6 50.8BE 4S001 41.5 43.5 47.1 48.B 49.3 50.8 S1.5 51.8 52.2 52.3 52.5 52.6 52.7 5?.7 52.9

GE 4CO01 45.7 47.9 51.6 53.8 54.5 56 .0 56.8 57.0 57.6 57.7 57.9 58.0 58.1 5e.1 58.3GE 35001 48.9 51.4 55.3 57.4 58.1 59.7 60.6 60.8 61.4 61.5 61.6 61.7 61.9 61.9 62.16E 30C01 53.9 57.3 61.3 63.6 64.3 66.0 67.0 67.3 68.2 68.3 68.11 68.7 68.8 64.9 69.1

GE 25001 56.2 60.1 6,4.3 66.9 67.6 69.6 70.7 70.9 71.9 72.1 72.2 72.4 72.5 77.7 72.9

: GE 20001 59.3 63.3 68.4 71.2 71.9 74.3 75.14 75.6 76.6 76.0 76.9 77.1 77.2 77.3 77.6GE 1G00 59.3 63.3 68.5 71.4 72.1 74.4 75.5 75.7 76.8 76.9 77.0 77.2 77.3 77.5 77.7GE 15001 61.5 65.5 71.1 74.2 75.*0 77.5 78.5 79.1 80.2 8 . 3 80.4 80.6 80.8 80.9 81.1GE 12001 63.0 67.1 73.1 76.3 77.1 79.7 80.8 81.3 87.5 82.6 82.7 83.0 83.1 83.2 83.5

GE 10001 64.4 68.5 75.0 78.3 79.3 82.2 83.5 84.0 85.2 85.4 85.6 85.8 85.9 86.0 86.3GE 9001 64.7 68.8 75.2 78.5 79.6 82.4 83.7 84.3 e5.6 85.9 86.0 86.3 86.4 86.5 86.7GE 8001 65.4 69.5 75.9 79.2 8C0.3 83.2 84.6 85.3 86.7 87.2 87.3 87.6 87.7 87.8 88.0GE 7L0 66.5 70.7 77.6 80.9 81.9 84.9 86.3 87.0 88.4 89.0 89.1 89.3 89.4 89.6 89.8GE 6001 66.5 70.7 77.6 81.0 82.0 85.2 86.7 87.6 89.1 89.9 90.1 90.4 90.5 90.6 90.8

GE 5001 66.5 70.8 77.9 81.3 82.5 86.3 88.0 89.4 ,91.2 92.0 92.3 92.5 92.6 9P.7 93.0

GE 4001 66.5 70.8 77.9 81.3 82.6 86.6 88.5 90.4 92.1 93.1 93.3 93.7 94.0 94.1 94.4GE 3001 66.5 70.8 77.9 81.3 82.6 86.6 88.5 90.5 92.4 93.5 94.0 94.4 941.8 95.3 96.1GE 2009 66.5 70.8 77.9 81.3 82.6 86.6 88.6 90.6 92.6 93.9 94.5 95.1 96.1 97.1 98.6GE 1IOl 66.5 70.8 77.9 81.3 82.6 86.6 88.6 90.6 92.6 93.9 94.5 95.1 96.5 9 7.11 99.4

GE O 66.5 70.8 77.9 81.3 82.6 86.6 88.6 90.6 92.6 93.9 94.5 95.1 96.5 97.41 100.0


0

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE O CEILING VERSUS VISIBILITYuSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC HOURS4LST): 1200-1410

......................................................... ............................................................ ..........................CEILING VISIBILITY IN HUNDREDS OF METERS

IN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET i 160 90 80 60 48 10 32 24 20 16 12 10 8 5 4 0

0 NO CEIL 1 24.5 26.2 27.6 27.9 28.0 28.5 28.6 29.0 29.2 29.2 29.2 29.3 29.3 29.4 29.4

GE 200001 31.0 32.9 34.4 34.8 34.9 35.4 35.6 36.0 36.1 36.1 36.1 36.3 36.3 36.4 36.4GE 180001 31.3 33.1 34.6 35.0 35.1 35.6 35.8 36.3 36.4 36.4 36.4 36.5 36.5 36.6 36.6GE 160001 31.3 33.1 34.6 35.0 35. 1 35.6 35.8 36.3 36.4 36.4 36.4 36.5 36.5 36.6 36.6GE 140001 11.3 33.1 34.6 35.0 35.1 35.6 35.8 36.3 36.4 36.4 36.4 36.5 36.5 36.6 36.6G 120001 11.7 33.6 35.0 35.7 35.8 36.3 36.5 36.9 37.0 37.0 37.0 37.1 37.1 37.3 37.3

GE 100001 '3.3 35.3 36.7 37.4 37.5 37.9 38.2 38.7 38.8 38.8 38.8 38.9 38.9 39.0 39.0GE 90001 34.5 36.5 37.9 38.6 38.7 39.1 39.5 39.9 40.0 40.0 40.0 40.1 40.1 40.2 40.2GE 8000 39.2 41.4 42.9 143.8 44.1 44.7 5.0 45.5 45.6 45.6 45.6 45.7 45.7 45.8 45.8GE 70001 40.5 42.6 44.2 45.1 45.5 46.0 46.3 46.8 46.9 46.9 46.9 47.0 47.0 47.1 47.1GE 601 U 40.S 42.6 44.2 4S01 45.5 46.0 46.3 46.8 46.9 46.9 46.9 47.0 47.0 47.1 47.1

GE SCO0 41.5 43.6 45.2 46.2 46.6 47.1 47.5 47.9 48.0 48.0 48.0 48.1 48.1 4 9.2 48.2GE 45001 43.2 45.7 47.6 48.7 49.0 49.6 49.9 50.3 50.4 50.4 50.4 50.6 50.6 50.7 50.7GE 40003 48.2 50.8 52.9 54.2 54.8 55.5 55.9 56.3 56.4 56.4 56.4 56.7 56.8 56.9 Sb9GE 35o3 50.8 53.4 55.8 67.1 57.6 58.8 59.1 59.6 59.8 59.8 59.8 60.0 60.1 60.2 60.2

O GE 30003 54.5 57.5 60.4 61.9 62.4 63.S 64.0 64.S 64.7 64.7 64.7 65.0 65.1 65.2 65.2

GE 2S003 S7.5 61.0 64.2 65.7 66.3 67.4 68.0 68.6 68.8 68.8 68.8 69:1 69.2 69.3 69:3GE 20001 60.2 63.6 68.3 70.3 70.8 72.2 72.8 73.5 73.7 73.7 73.7 73.9 74.1 74.2 74.2GE 18001 60.3 63.7 68.4 717.4 71.0 7Z.3 72.9 73.6 13.8 73.8 73.8 74.1 74.2 74.13 74.3GE 15003 63.9 67:4 72.2 74.5 75.1 76.5 77.2 77.9 78.2 78.2 78 78. 78:5 70.6 78.6

O GE 12003 65.7 69.6 74.8 77.6 78.3 80.0 81.0 81.9 82.2 82.2 82.2 82.5 42.6 82.7 82.7

GE 1CO 67.8 71.8 77.7 80.5 81.2 83.1 64.3 85.3 85.6 8S.6 85.6 85.9 86.1 86.3 86.3C GE 90J3 68.2 72.4 78.3 81.2 81.8 83.8 85.0 86.0 86.5 86.S 86.5 86.8 87.0 87.1 87.1

GE 9001 68.8 73.2 79.2 82.0 82,7 85.1 86.5 87.6 88.0 88.0 88.0 88.4 88.6 88.7 88.7GE 7001 69.S 73.8 80.0 81.0 83.7 86.6 87.9 89.2 89.7 897 89.7 90.0 90.2 91.4 90.4GE 6003 70.0 ?4.4 80.8 83.8 84.6 87.5 88.8 90.6 91.0 91.0 91.0 91 4 91.8 91.9 91.9

GE 5031 70.0 74.5 81.2 84.3 85.0 88.2 89.8 91.7' 92.2 92.2 92.2 92.6 93.0 93.1 93.1GE 4003 70.0 74.5 81.2 84.5 85.4 88.9 90.6 9Z.S 93.7 93.7 93.8 94.2 94.8 94.9 94.9GE 3001 10.0 74.5 81.3 84.7 85.6 89.1 90.8 92.7 94.2 94.2 94.5 95.1 96.2 96.8 97.3GE 2001 70.0 74.6 81.4 84.8 85.7 89.2 90.9 92.9 94.S 94.5 94.8 95.5

96.9 97.9 99.3

GE 1001 70.0 74.6 81.4 84.8 85.7 89.2 90.9 92.9 911S 94.5 94.8 95.6 97.3 99.6 100.0

GE o 70.0 74.6 81.4 84.8 85.7 89.2 90.9 92.9 94.5 94.S 94.8 95.6 97,3 94.6 100.0

..........................................................................................................................

TOTAL NUMPER OF OBSERVATIONS: 902

4.

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC HOURSILSTI: 1501-17D0

........... ..................................................................................................................CEILING VISIBILITY IN HUNDREDS OF METERS

IN 6I GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEE T I 160 90 so 60 48 I0 32 24 20 16 12 10 B 5 4 0....... ?....s.........................................................................

. NO CEIL I 25.5 27.1 28.7 28.9 29.2 29.3 29.8 29.8 30.0 30.1 30.1 30.1 30.2 30.2 30.3

GE ZOOI 30.2 32.1 33.8 34.1 34.4 34.8 35.4 35 *4 35.7 35.9 3S.9 35.9 36.0 36.0 36.1GE 180001 30.2 32.1 33.8 34.2 34.6 34.9 35.S 35.5 16.6 36.0 36.0O 36.0 36.1 36.1 36.2GE 16D00 3o.2 32.1 33.9 34.4 34.8 35.1 35.8 35.8 36.0 36.2 36.2 36.2 36.3 36.3 36.4

GE 140001 30.5 32.3 34.2 34.6 35.1 35.4 36.1 56.1 36.3 36.5 36.5 36.5 36.7 36.7 36.8GE 1200013 31.0 32.9 34.8 35.3 35.7 36.0 36.8 36.8 37.0 37.2 37.2 37.2 37.3 37.3 37.4

GE 100001 32.7 34.8 37.2 37.9 38.2 38.5 39.3 39.3 39.5 39.8 39.8 39.8 39.9 39.9 40.0GE 90001 33.3 35.4 30.0 30.6 39.0 39.3 40.1 40.1 40.3 40.5 40.5 40.5 40.6 4 0.6 40.8GE 80001 37.9 410.0 42.6 43.3 43.6 144.0 45.1 45.1 %5.3 4.5 45.6 45.S 4S.6 45.6 45.7GE 701Oi 40.0 42.1 44.9 4S.5 45.8 46.2 47.. 47.4 47.6 47.8 4178 47.8 48.0 44.0 41a.1GE 60003 40.2 42.3 46.1 45.7 46.1 46.4 47.6 47.6 47.8 48.1 48.1 48.1 48.2 48.2 480.3

GE SCODi 41.6 43.9 46.6 47.3 47.6 48.0 49.2 49.2 49.4 49.6 49.6 49.6 49.7 49.7 49.8GE 45001 43.7 46.0 48.7 919.4 49.7 50.1 51.3 51.3 51.5 61.7 51.7 51.7 51.8 51.8 51.9GE 40001 48.4 50.6 53.4 54.0 54S, 55.1 S6.S 56.5 S6.8 57.0 57.0 57.0 S1.1 57.1 57.3GE 35O01 51.8 54.2 57.0 57.8 58.3 S9.4 60.7 60.7 61.0 61.2 61.2 61.2 61.4 611.4 61.5GE 30001 58.3 60.8 6.3 65.2 65.7 66.9 68.3 68.3 68.7 60.9 68.9 68.9 69.0 6Q.0 69.1

GE 25*0 61.9 64.9 68.9 69.8 70.2 71.7 73.3 73.3 73.6 73.9 73.9 73.9 74.3 74.0 74.1GE 2'003 5.3 68.4 73. 2 71.5 75.0 76.7 78.5 78.5 78,8 79.1 79.1 79.1 79.2 74.2 79.3GE 1800 6S.8 680.9 73.6 75.0 75.5 77.5 79.3 79.3 79.6 79.8 79.0 79.6 80.0 0.0 80.1GE IS00 67.8 71.4 76.6 78.1 78.7 81.1 83.1 8 3.2 835 83.7 83.7 83.7 83.8 81.8 83.9GE 12003 69.2 73.0 78.6 80.3 81.0 83.4 85.5 85.6 85.9 86.2 86.2 86.3 86.4 86.4 86.5

GE 1000 69.9 74.0 80.0 81.9 82.7 85.6 87.8 88.0 88.4 88.6 88.6 88.7 88.8 88.8 88.9GE 90 70.1 74.2 80.2 82.2 82.9 85.8 88.0 8803 88.6 88.8 88.8 88.9 89.0 89.0 69.1GE 80u 70.S 74.8 80.8 82.9 8307 86.7 89.3 89.5 A9.9 9n.3 90.3 90.5 90.6 90.6 9007GE 7001 70.9 75.2 81.3 83.5 84.4 87.6 90.3 90.6 91.1 91.5 91.5 91.7 91.8 91.8 91.9GE 6003 70.9 75.3 81.4 83.6 84.5 87.7 90.5 91.3 91.7 92.0 92.0 92.4 92.6 92.6 9.7

GE 5r0 71.1 75.6 81.9 84.2 85.0 88.3 91.1 91.8 92.5 92.8 92.8 93.1 93.% 93.4 93.S0 GE 4001 71.1 75.6 82.1 84.5 85.40 88.6 91.6 92.7 93.4 94.0 94.1 94.6 94.9 95.0 95.1GE 301 71.1 75.6 82.1 84.S 85.4 88.6 91.6 92.8 93.8 94.6 94.8 95.2 96.3 96.6 96.8GE 2031 71.1 75.6 82.1 84.5 856.4 88.6 91.6 92.8 94.0 946.9 95.1 96.2 97.3 97.9 98.6GE IGO 71.1 75.6 82.1 8405 85.4 88.6 91.6 92.8 94.0 94.9 95.1 96.2 97.7 94.6 100.0

GE 0I 11.1 75.6 82.1 84.5 85.4 88.6 91.6 92.8 94.0 94.9 95.1 96.2 97.7 98.6 100.0


C GLOBAL CLIMAILOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE OF CEILING VERSUS VISIBILITYUSAFETAC FROM 1OURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC POURSCLSTI: 18601.Z.Oc... .. ... .. ... .. ... .. .. ... .. ... .. ... .. ... .. .. ... .. ... .. ... .. ... .. ............... ; ;[T. ............ .....

CEILING VISIBILITY IN HUNDREDS OF METERSIN GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 8C 60 48 40 32 24 20 16 12 10 8 5 4 0

NO CEIL I -28.5 30.3 3Z.5 33.2 33.7 34.7 35.S 35.7 35.9 36.1 36.1 36.1 36.1 36.3 37.0

GE 200001 33.8 36.2 38.7 39.4 39.9 41.0 42.0 42.1 42.4 42.S 42.5 42.5 42.5 42.8 43.5GE 180001 33.8 36.2 38.7 39.4 39.9 41.0 42.0 42.1 42.4 42.5 42.5 42 .S 42.5 42.8 43.5GE IbrDDJ !3.8 36.2 38.7 39.4 39.9 41.0 42.0 42.1 42.4 42.5 42.5 42.5 42.5 42.8 43.5BE 140001 33.8 36.2 38.7 39.4 39.9 41.0 42.0 42.1 42.4 42.5 42.5 42.5 42.5 42.8 43.5GE 120001 33.8 36.2 38.7 39.4 39.9 41.0 42.0 42.1 42.4 42.S 42.5 42.5 42.5 42.8 43.5

GE 100001 35.3 37.6 40.6 41.2 41.7 42.9 44.0 44.1 44.4 44.5 44.5 44.5 44.5 44.8 4S.4GE 90U0 75.4 37.8 40.7 41.3 41.9 43.1 44.1 44.3 44.5 44.6 44.6 44.6 44.6 44.9 45.6GE 81001 40.3 43.3 46:4 47.0 47.6 48.7 449:8 49.9 50.2 Sn:,3 50.3 50.3 S0.3 50:6 51.3G 73003 40.7 ,43.7 47.2 478 48.5 49.7 50.7 51.0 51.3 51., 51.4 51.4 51.4 51.7 S2.3GE 6Ou0i 40.7 43.7 47.2 47.8 4B.5 9.7 50.7 51.0 51.3 51.4 51.4 51.4 51.4 51.7 52.3

GE 50001 41.7 46.0 48.5 49.1 49.8 51.0 52.0 S2.3 52.6 52.7 52.7 52.7 Sz.7 61.0 53.6GE 45001 44.0 47.7 51.4 52.0 52.7 53.9 55.0 $5.2 5S.5 55.6 55.6 55.6 55.6 55.9 56.5GE 40001 49.0 53.0 56.8 58,0 58.7 60.0 61.0 61.3 61.6 61.7 61.7 61.7 61.7 62.0 62.6GE 35003 51.8 SS.7 59.7 61.0 61.8 63.4 64.5 64.7 65.0 6S.1 65.1 6S.1 65.1 65.4 66.1GE 3300 57.3 61.7 65.9 67.2 68.0 69.6 70.7 70.9 71.2 71.3 71.3 71.3 71.3 71.6 72.3

GE 25001 S9.2 63.5 68.2 69.6 70.4 72.0 73.1 73.3 73.7 77.8 73.8 73.8 73.8 74.1 74.8GE 20001 61.4 66.3 71.9 73.4 74.2 76.2 77.3 77.S 77.9 78.1 78.1 78.1 78.1 78.3 79.0GE 18L0I 61.6 66.4 72.0 73.6 74.4 76.4 77.4 77.7 78.1 74.2 78.2 78.2 78.2 74.5 79.1GE 16003 6S.4 70.8 77.1 79.1 79.9 82.3 83.4 83.6 84.0 84.1 84.1 84.1 84.1 84.4 85.1GE 12001 66.7 72.1 78.7 81.1 81.9 84.S 85. 86.0 86,4 86.s 86.5 86.6 b.5 86.8 87.5

GE 1100 67.4 72.8 79.7 82.3 83.2 86.0 87.6 87.8 88.2 81.4 88.4 88.4 R8.4 8P.6 89.3O GE 9C0 67.6 73.1 79.9 82.6 83.5 86.4 88.1 88.4 88.8 88.9 88.9 88.9 88.9 814.2 89.8

GE 8003 68.4 73.8 80.8 83.5 84.4 87.3 89.0 89.3 A9. 7 89.8 89.8 89.8 90.0 9 7.2 9U.9GE 7001 68.7 74.4 81.6 84.4 85.3 Bs.2 90.4 90.6 91.0 91.1 91.1 91.1 91.3 91.5 92.2GE 6001 68.8 74.6 82.2 804.9 85.9 8.8 90.9 915 9.9 92.1 92.1 92.1 92.2 92.5 93.1

GE SOUl 49.1 7S.C 82.6 85:3 86.3 89.3 91:7 92.3 '27 97.9 92.9 92:9 93:0 93.3 93.9GE 400 69.1 75.0 82.6 85.9 86.8 89.8 92.6 93.7 94.2 94.6 94.6 94.6 94.7 95o0 96.6GE 3;01 69.2 76.2 82.7 86.0 86.9 9n.0 92.9 93.9 9s.8 95.2 95.2 95.2 95.5 9,;.8 96.4GE Z003 69.2 7SZ 82.7 86.0 86.9 9T.0 92.9 93.9 95.2 960 96.0 96.4 96.7 97.0 98.3GE loi 69.2 75.2 82.7 86.0 86.9 9-.0'1 92.9 93.9 95.2 96.0 96.0 96.4 96.7 97 .4 1CG.o

GE 03 E9.2 TS.2 82.7 66.0 86.9 90.0 92.9 93.9 95.2 96.0 96.0 96.4 96.7 97.4 27G.O.............................................................................................................................................

TOTAL NUMBER OF OBSERVATIONS: 757*-4, 0 ° 00 0 0 0 • • e s • o


AIR WEATHER SERvICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO-IBURY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTH: DEC HOURSILSTI: 2100-23G0

CEILING VISIBILITY IN HUNDREDS Of METERSIN I GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET I 160 90 8 60 48 q0 32 24 20 16 12 10 8 5 4 0

NO CEIL I 26.7 29.8 33.3 33.9 34.0 34.1 34.4 34.6 35.0 35.0 35.0 35.5 35.6 35.9 37.0

GE 200001 29.4 32.7 36.2 36.7 37.0 37.1 37.4 37.6 38.0 38.0 38.0 38.5 38.6 38.9 40.0GE 180001 29.4 32.7 36.2 36.7 37.0 37.1 37.4 37.6 38.0 38.0 38.0 36.5 38.6 38.9 40.0GE 161001 29..4 32.7 36.2 36.7 37.0 37.1 37.4 37.6 38.0 38.0 38.0 38.5 38.6 38.9 40.0GE 14300i 29.4 32.7 36.3 36:9 37.1 37.3 37.6 37.7 38.1 3.1 38.1 38.6 38.8 39.0 40.1GE 120001 29.14 32.7 36.3 36.9 371 37.3 37.6 37.7 38.1 34.1 38.1 38.6 38.8 39.0 40.1

GE :1300 31.6 34.8 38.5 39.0 39.5 39.6 40.0 40.1 40.5 40.5 40.5 41.1 41.2 41.S 42.6GE

90001 33.3 36.7 404 41.0 41.,4 41.5 41.9 42.0 42.4 42.4 42.4 43.0 43.1 43.4 44.5

GE 80001 38.1 42.0 45.7 46.3 46.7 46.8 47.z 47.3 47.8 47.8 47.8 48.3 48.4 44.7 49.8GE 7COOS 38.9 43.0 46.7 47.5 47.9 48.0 48.4 48.6 49.0 49.0 49.0 49.5 49.7 49.9 51.0GE 60001 39.3 43.4 47.1 47.9 48.3 48.4 48.8 49.0 49.4 49.4 49.4 49.9 50.1 5n.3 51.4

GE 50001 41.1 45.2 48.8 49.7 50.1 50.2 50.6 50.7 51.2 51.2 51.2 51.7 51.8 52.1 53.2GE 45001 42.3 46.9 51.0 52.0 S2.4 52.5 52.9 53.1 53.5 53.5 53.5 54.0 54.1 54.4 55.5GE 4 OOl 48.6 53.5 57.6 $9.2 59.6 $9.7 60.7 60.8 61.2 61.2 61.2 61.8 61.9 62.2 63.3GE 35C0 50.5 55.4 59.9 61.5 61.9 62.4 63.4 63.5 63.9 63.9 63.9 64.5 64.6 64.9 66.0GE 30001 54.0 59.5 64.6 66.3 66.7 67.3 68.4 68.6 69.0 69.0 69.0 69.5 69.7 69.9 71.0

GE 25001 57.6 63.0 68.3 70.2 7C.6 71.6 72.8 72.9 73.3 73.3 73.3 73.9 74.0 74.3 75.4GE 21001 60.7 66.3 72.2 74.1 74.6 75.6 76.9 77.0 77.4 77.4 77.4 78.0 78.1 78.4 79.5GE 18001 61.0 66.5 72.5 74.4 74.8 75.9 77.1 77.3 77.7 77.7 77.7 78.2 78.4 7R.6 79.7GE 15001 63.1 69.0 75.8 77.8 78.4 79.5 80.7 80.8 81.2 81.2 41.2 81.8 81.9 82.2 83.3GE 12601 63.8 69.9 77.3 79.3 BL1 81.6 82.9 83.0 83.4 83.4 83.4 83.9 84.1 84.4 85.4

GE IC00 64.9 7 1.3 79.0 81.5 82.4 83.9 85.2 85.3 85.7 85.7 85.7 86.3 86.4 8607 87.8GE 9001 65.7 72.2 80.0 82.4 83.4 84.9 86.1 86.3 86.7 86.7 86.7 87.2 47.3 87.6 88.7GE goa0 66.7 73.3 81.2 84.1 85.0 86.7 88.0 88.2 88.6 88.6 88.6 89.1 89.3 89.s 90.6GE 7U3J 66.8 73.5 81.5 8.4 45.3 86.9 88.7 88.8 89.3 89.3 89.3 89.8 90:1 9'?3 91.7GE 600 66.9 73.9 82.3 85.3 86.3 87.9 89.8 902 90.7 9r!09 90.9 9 1.4 91.7 9 .0 93.3

GE SOoS 66.9 74.0 82.4 85.4 86.5 88.6 90.5 90.9 91.4 91.6 91.6 92.1 92.4 9207 94.0GE 40,31 66.9 74.0 42.4 85.6 86.7 88.7 93.7 91.2 "91.7 91.8 91.8 92.4 92.7 92.9 94.3GE 30o5 67.1 74.3 82.7 85.9 86.9 89.1 91.3 91.7 92.9 93.1 93.1 93.6 94.4 94.7 96.2GE zb0l 67.1 74.13 82.7 86.0 87.1 89.4 91.6 92.1 93.4 9.0 94.1 94.8 95.8 96.1 99.2GE 1005 67.1 74.3 82.7 86.0 87.1 89.4 91.6 92.1 93.9 94.0 94.1 94.8 95.8 96.3 100.0

GE GJ 67.1 74.3 62.7 86.0 87.1 89.4 91.6 92.1 93.9 94.0 94.1 94.8 95.8 96.3 100.0. ...........................................................................................................................

IOTAL NUMBER OF ODSERVATIONS: 735

SJ_4

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURRENCE Or CEILING VERSUS VISIBILITY

USAFETAC FROM 1-OURLY OBSERVATIONSK AIR WEAT14ER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME. P F ALCONBURY UNITED KINGDOM PERIOD OF RECORD: ?7-86MONTH: DEC HOURSILSTI: ALL

-O

CE ILING VISIBILITY IN HUNDREDS OF METERSIN IGT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GE

FEET 1 160 90 80 6U 98 90 32 29 20 16 12 104 0.................................................... ...............................................................................................

I0NO CEIL I 26.8 28.8 31.0 31.7 31.9 32.11 32.8 33.0 33.2 33.2 33.2 33.3 33.4 3 3.6 39.0

GE 200001 11.3 33.5 35.'9 36.7 36.9 37.4 38.0 38. 1 38.3 38.9 38.9 38.6 38.7 38V.A 39.30GE 180001j 31.9 33.6 36.0 36.9 37.1l 37.6 38.1 38.3 38.5 38.6 38.6 38.7 38.8 39.9 39.5

GE 160001 !1.4 33.6 36.0 36.9 37.1 37.6 38.1 38.3 38.5 38.6 38.6 38;7 38.A 39.0 39.5GE 190001 31.5 33.7 36.1 37.0 37.2 37.7 38.3 38.9 38.6 38.7 38.7 38.9 39.0 39.1 39.6GE 12nou1 31.7 33.9 36.4 37.3 37.5 38.0 38.6 38.7 38.9 39.0 39.0 39.2 39.2 39.4 39.9

GE 100001 33.1 35.9 38.0 39.0) 39.2 39.7 90.3 40.5 90.7 901.8 40.8 90.9 91.0 91.2 91.7OGE 90001 !3.8 36.1 38.7 39.7 39.9 90.4 91.0 91.2 91.9 41.5 91.5 91.7 91.8 41.9 92.9

GE 80001 38.3 90.8 9#3. 994.6 994.9 95.5 96.1 96.3 96.6 96.6 96.7 96.8 46.9 9 7.1 47.6GE 70001 39.9 91.9 99.8 45.9 96.2 96.3 97.9 97.6 97.9 98.0 98.0l 98.1 98.2 96a.9 9t8.9GE 60001 39.6 92.2 95.1 916.1 96.1 974.1 97.7 97.9 98.2 98.3 98.3 8.5 98.6 40.7 99.2

GE 50001 91.1 943.7 96.6 97.8 98.1 98.7 99.4 99.6 99.8 99.9 50.0 50.1 50.2 50.9 50.9OGE 4S001 92.7 95.6 98.8 50.0 50.3 51.0 51.6 51.8 S2.1 52.2 52.2 52.9 52.5 52.6 53.2

GE 40001 97.9 50.5 53.8 55.3 55.7 S6.5 57?.3 57.5 57.8 57.9 58.0 58.1 58.2 58.9 58.9*GE 3S001 50.3 53.5 57.0 58.6 59.1 60.1 60.9 61.2 61.9 61.6 61.6 61.8 61.9 62.0 62.6

GE 30001 55.0 58.6 62.7 64.3 69.8 65.9 66.8 67.1 67.5 67.6 67.6 67.8 67.9 69.1 68.6

GE 25001 58.2 62.1 66.5 68.3 68.8 10.1 71.0 71.3 71.7 71.8 71.9 72.0 72.2 77.9 72.9*GE 20001 61.1 65.2 70.5 72.& 73.1 79.7 75.7 76.0 76.9 76.6 76.6 76.8 76.9 77.1 77.6

GE 18001 61.3 65.9 70.8 72.9 73.91 75.0 76.0 76.3 76.8 76.9 77.0 77.1 77.3 77.9 78.0*GE 15001 63:7 68.1 73.9 76.2 76..8 78.5 79.6 80.0 8094 80.6 80.6 80.8 90.9 8 1.1 81.6

GE 12001 65.2 69.8 76.0 78.5 79.2 81 .2 82.3 82.8 83.2 83.9 83.9 83.6 83.7 83.9 89.5

G E 10001 66.3 71.0 77.8 80.9 81.2 83.3 89.6 85.1 85.6 85.7 85.7 86.3 86.1 86.3 86.8* )GE 9U01 66.6 71.5 78.3 81.1 81.8 89 .0 85.3 as.7 86.3 86.4 86.S 86.7 86.9 67.0 87.6

GE 800) 67.3 72.3 79.2 82.0 82.7 85.0 86.5 B7.0 97.S 87.7 87.$868.0 @8.2 88.9 88.9GE 7001 67.9 72.9 80.0 82.9 63.6 86.1 81.6 88.2 88.8 89.0 89.1 89.3 89.5 99.7 90.3

0GE 6001 68.0 73.1 60.5 83.9 89.2 86 .7 88.3 89.1 89.8 90.1 90.1 90.91 90.6 90.8 91.9

GE SOO1 e8.2 73.91 81.0 89.0 89.9 87.6 89.5 90.9 91.2 91.5 91.5 9t.8 92.1 92.2 92.80GE 9001l 68.3 73.6 81.1 89.3 85.3 88.2 90.3 91.5 ;2.9 92.9 92o9 93.2 93.5 93.7 99.3

GE 3001 68.3 73.7 81.3 89.5 85.5. 88.9 90.1 91.9 93.1 93.5 93.7 99.0 99.7 95.1 96.2GE zoo1 68.3 73.7 81.3 891.5 85.5 88.5 90.6 92.0 93.5 96.0 94.4 95.0 95.9 96.5 98.5GE 1001 68.3 73.7 81.3 89.5 85.5 88.5 90.6 92.0 93.5 99.0 99.9 95.0 96.2 97.0 99.7

GE 01 68.3 73.7 81.3 6%.5 85.5 88.5 9 0.6b 92.0 93.5 99.0 99.9 95.0 96.2 97.2 1(0.0....................................................................................................................................................


iJ

*

2

GLOBAL CLIMATOLOGY BRANCH PERCENTAGE FREQUENCY OF OCCURPENCE OF CEILING VERSUS VISIBILITYuSAFETAC FROM VOURLY OBSERVATIONSAIR WEATHER SERVICEiMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOVBURY UNITED KINGDOM PERIOD OF RECORD: 77-87

MONTH: ALL HOURS4LST): ALL

CEILING VISIBILI7T IN PUNDREDS OF METERS

IN | GT GE GE GE GE GE GE GE GE GE GE GE GE GE GE GEFEET I 160 90 80 60 8 IO 32 24 ZO 16 12 10 8 5 4 0

NO CEIL I 27.6 28.9 31.0 32.0 32.3 32.9 33.3 33.5 33.7 33.8 33.9 33.9 34.0 34.1 34.3

GE 200001 32.8 34.5 37.0 38.2 38.6 39.3 39.8 40.0 40.3 40.4 40.5 40.5 40.6 4 7.7 41.0GE 180003 33.0 34.6 37.2 38.# 38.7 39.5 39.9 '0.2 40.5 40.6 40.7 40.7 40.8 43.9 41.2

GE 1600o 33.0 34.6 37.2 38.4 38;a 39.5 40.0 40.2 40.5 40.6 40.7 40.7 40.8 4 0.9 41.2GE 14P00 33.1 3'4.8 37.3 38.6 38.9 39.6 40.1 40.3 40.6 '40.7 40.8 40.9 41.0 41.0 41o4GE 12000| 33.6 35.3 37.9 39.1 39.5 40.2 40.7 40.9 41.2 41.3 41.4 41.5 41.6 41.7 42.0

GE 100003 35.9 37.7 'o.S '4. '421 '42.9 '43.4 '437 440 44.1 44.2 44.3 44.4 44.4 44.7

GE 90003 36.6 38.4 41.2 42.6 43.0 '43.7 '4.2 4.S '44.9 450 45.0 'S.1 '45.2 45.3 45.6GE 8I0X '| 40.5 42.5 '5.6 47.1 47.5 48.3 48.9 49.2 49.6 4Y.7 49.7 49.8 '49.9 5.0 50.3GE ?1: '41.4 '43.:4 46.6 '481 '485 49 .4 50.0 50.3 50.6 5.7 S0.8 10.9 51.0 51.1 51.4GE 60001 41 .643 46. '48.3 '48.8 49.6 50.2 So.S 50.9 51.0 S1.1 51.2 51.3 51.4 51.7

GE SCO a 49.0 46.2 '9.6 51.2 51.7 52.7 53.3 53.6 54.0 54.1 S4.2 S4.3 54.4 54.5 54.8GE 4SUI '46.5 '48.9 52.6 SN.3 54.8 S5.8 56.5 56.8 57.2 57.3 S7.4 57.5 57.6 57.7 58.0

GE 40001 52.2 54.8 s5,8 60.7 61.3 62.4 63.1 63.5 64.0 64.1 6'4.2 6N.3 64.4 64.S 64.8

GE 35uoI 56.2 58.9 63.3 65.3 65.9 67.1 67.9 68.3 68.8 69.0 69.1 69.2 69.3 69.4 69.7GE 30001 61.2 64.3 69.0 71.2 71.9 73.2 74.2 74.6 75.2 75.3 75.4 75.5 7S.7 75.7 76.1

GE 25001 63.8 67.1 72.2 74.5 75.2 76.6 77.6 78.1 78.7 78.9 79.0 79.1 79.2 79.3 79.6

C GE 20001 66.3 69o9 7S.'4 77.9 78.7 80.2 81.3 81.8 82.4 82.6. 82.7 82.8 83.0 87.1 83.4GE 18001 66.6 70.2 75.7 78.3 79.1 80.6 81.7 82.2 82.9 83.1 83.2 83.3 83.5 83.6 83.9

GE 15003 68.6 72.3 78.2 81.1 81.9 83.6 84.8 8S.3 86.0 86.2 86.3 86.4 86.6 86.7 87.0

) GE 12001 69.9 73.8 70.0 83.1 84.0 AS.8 87.1 87.7 8B.5 88.6 '8.8 88.9 89.0 89.1 89.5

GE 10001 7D.7 74.8 81.3 84.5 85.5 87.4 88.8 B9.4 90.3 9n.5 90.6 90.6 90.9 91.0 91.4SGE 9001 71.0 75.2 81.8 85.0 860 88. 89.4 90.1 90.9 91:2 91:3 91:S 91.6 91.7 92.1

GE soul 71.3 75.6 82.3 85.7 86.7 88.7 90.2 90.9 91.8 92.1 92.2 92.4 92:S 92,6 93.0GE 7c01 71.7 76.0 82.9 86.4 87.5 89.7 91.3 92.1 93.0 93.3 93.5 93.6 93.8 a V3.9 94.3

GE 6001 71.8 76.2 83.2 86.9 88.0 90.2 92.0 92.8 93.8 94.1 94.3 94.5 94.7 94.8 95.1

GE 903 71.9 76.3 83.5 87.2 88.4 90.8 92.7 93.6 r 94.7 95.0 95.2 95.4 9S.6 9s.8 9b.1GE q0 71.9 76.4 83.6 87.4 88.7 91.1 93.1 94.1 95.4 95.7 96.0 96.2 96.5 96.6 97.0

GE 3001 71.9 76.4 83.7 87.5 88.8 91.2 93.3 94.4 91.8 96.2 96.6 96.9 97.3 97.5 98.1GE zoaI 71.9 76.4 83.7 87.5 88.8 91.3 93.4 94.5 96.0 96.S 96.9 97.3 97.9 9S.2 99.1GE 10| 71.9 76.4 83.7 87.5 88.8 91.3 93.4 94.S 96.0 96.5 97.0 97.4 98.2 98.4 89.9

GE o 71.9 7604 83.7 87.5 88.8 91.3 93.4 94.S 96.0 96.5 97.0 97.4 98.1 99.5 100.0

.... . O..................................................................... ........................................


PPPPPPPP AALA RRRRRRRR TTTITTTITT EEEEEE

PPPPP PPPP AAA A RRRRRRRRP TTITTTITT EEELEELpp pp ALA AA RR AR IT ELEpp pp AL A LA R R R ITI ELEPPPPPPPPP L A A A RRRQRRRRR IT EEELpppppppp LAAALAALA RRRRARRR IT EEELEpp LALAALLAA R R RR IT EEpp ALA AA RR R IT ELEpp LA AL RR RR I EEEEEELPP AL AL RR PR IT ELEEEEE

E

TEMPERATURE AND RELATIVE HUMIDITY SUMMARIES

CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE OF DAILY MAXIMUM (MINIMUM AND MEANI TEMPERATURES

DATA DERIVED FROM SUMMARY OF UAY DATA.

* PERCENTAGE TABULATIONS PRESENTED BY S-DEGREE FAHRENHEIT INCREMENTS PLUS THE MEAN, STANDARD DEV-

IATIONS ANC TOTAL OBSERVATION COUNT.

TPf MINJMUP TABLE ALSO INCLUDES A 33 FAFRENHEIT DEGREE-INCREMENT.

SINCE MANY STATIONS/SITES 00 NOT H4ARE MAXINUMIMINIMUM THERMOMETERS. THESE TEMPERATURES WERE SELECTED BY SCANNING

THE HOURLY OBSERVATIONS FOR THE HIGHEST AND LOWEST VALUES.

STATISTICS 00 NOT INCLUDE INCOMPLETE MONTHS (THOSE CONTAINING ASTERISKS).

FOUR OR MOVE COMPLETE MONTHS ARE REQUIRED FOR COMPUTATION AND DISPLAY OF STATISTICAL VALUES.

EXTREME MAXIMUM AND MINIMUM VALUES

DATA DERIVED FROM SUMMARY OF DAY DATA.

PRESENTED ARE THE HIGHEST fLOwESTi TEMPERATURE FOR THE MONTH FOR EACH YEAR.

ALSO PRESENTED ARE STATISTICAL VALUES WITH THE SAME LIMITATIONS MENTIONED ABOVE.

AN ASTERIST INDICATES AN INCOMPLETE MONTH.

MEANS AND STANDARD DEVIATIONS FOR DRY BULB IWET BULB AND DEW POINT) TEMPERATURES

UATA DERIVED FROM HOURLY OBSERVATIONS.

DATA PRESENTED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH, MONIHLY AND ANNUALLY (ALL YEARS COMBINED).

PRESENTED ARE MEANS, STANDARD DEVIATION AND OBSERVATION COUNTS.

CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE OF RELATIVE HUMIDITY

DATA OFRIVED FROM HOURLY OBSERVATIONS.

SUMMARIZED BY THE STANDARD 1-HOUR TIME GROUPS BY MONTH. MONTHLY AND ANNUALLY (ALL YEARS COMBINED).

PERCENTAGE VALUES PRESENTED IN 10 DEGREE INCREMENTS OF RELATIVE HUMIDITY.

ALSO PRESEkTYo ARE THE MEAN VALUES AND OBSERVATION COUNTS.

0 ..a

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE OF OCCURRENCE OF MAXIMUM TEMPERATURES

USAFETAC FWOH SUMMArY OF DAY DATA


STATION NUMBER: C35623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORU: 5S-87

IEMP(FJi JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUAL

G E 9. 1 .3 .b6 .• .GE 851 1.1 2.6 1.4 .VGE pI .2 4.1 7.4 6.2 .? .1 1.6bE 751 L .1 8. 1. 20. 11. 4. 18.E 701 .4 .9 V.9 2A.0 43.1 43.0 70.3 2.9 12.3GE 651 1:.1 5. 21.0 52.2 73.5 72:5 dA.8 11.7 . 23.8

01GE A .5 4.. 17.7 51.0 83.9 96.1 97.6 86.3 37.2 3.2 .Z 39.6GE SSI 1.2 2.7 14.5 43.0 79.8 97.9 99.7 99.9 97.6 71.3 1A.2 5.5 S2.5bE 511 15.7 19.8 2.8 724 96.3 99.9 C0.0 I00.0 Q9.9 93.5 46.8 Z5.3 17.6

0 0E 451 4 0 .a 43.2 7U.3 91.3 100.0 1OG. 100.0 99.7 76.6 49.9 8G .9fE 401 61.9 66.2 89.4 98.7 100.3 93.9 74.4 90.3GE 351 85.5 90.3 99.2 100.0 99.5 s3.2 97.3GE 31 9 72 99.4 100 . 99.9 99.2 99,6GE 2SI 99.6 10 3. C 1O.C 13.0 IOC.OGE Z11 99.9 1C.

bE 151 100.0 100.0...............................................................................................................................

MEAN 1 42.2 93.1 48.D 53.3 60.0 66.2 69.2 69.0 64.8 S7.7 48.8 4.4 S1.SSo I 6.768 6.51 6.481 6.570 6.435 6.913 6.574 6.017 5.516 5.841 5.837 6.510 11.688

TOTAL OBS I 953 863 94t 889 922 898 930 93C 918 934 916 919 11053

...............................................................................................................................

GLOBAL CLIMATOLOGY BRANCP CUMULATIVE PERCENTAbE OF OCCURRENCE OF MINIMUM TEMPERATURESUSAFETAC FROM SUMMARY OF OAY DATAAIR WEAT-ER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY U1ITED KINGDOM PERIOD OF RECORD: 55-B7

.........................................................................................................................................

TEMPIFII JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOW DEC ANNUAL

.........................................................................................................................

GE 701 1 .I .I .I .1 .0bE 651 .4 .6 .9 .4 .2

GE 6"1 .1 .7 2.8 11.1 10.2 3.4 .9 2.4GE 551 .4 2.0 16.5 44.2 42.2 2L.9 6.

3 .9 .2 11.1

GE Sl .2 .5 1.4 4.U 16.2 55.2 P4.6 91.9 57.8 27.5 5.7 2.6 28.2

GE 451 5.8 5.1 7.j, 20.1 54.6 99.2 99.0 98.1 86.9 56.1 19.9 10.6 46.0bE 401 19.0 18.1 25.7 52.3 86.0 98.8 99.9 100.0 97.9 82.5 45.1 26 .3 62.6GE 351 49.7 45.3 64.6 83.8 98.4 100.0 100.0 99.9 96.7 ?7.8 !9.9 61.3

SE 3!1 61.8 59.7 77 .3 92.1 99.5 1M0.0 98.6 86.1 72.1 67. 3GE 301 78.4 78.6 89.3 98.2 100.0 99.8 94.1 FS.4 93.6bE 251 92.2 93.6 97.4 99.8 100.0 98.9 95.4 98.IE 23, 96.9 98.5 99.7 IDO, 100.0 t. 6 99.5

GE 151 99.1 99.8 99.9 11O0 99.9GE It1 99.6 100.0 10.0 IOC .0.E 51 99.9 100.0bI "I 100.0 100.0

..................................................... ..........................................................................MFAN 34.1 34. J 36.3 40.0 45.0 50.0 53.9 53.5 r1J.2 45.5 39.1 36.0 43.1

so I 6.938 N . 281 5.713 5.426 4.790 4.671 4.456 4.628 5 U69 5.948 6.320 6.783 9.139TOTAL OR8 S 953 963 946 889 922 898 93D 930 918 934 916 954 11053

........................................................... ...................................................................

GLOBAL CLIMATOLOG9 BRANCH CUMULATIVE PERCENTAUE OF OCCURRENCE Or MEAN TEMPERATLRES

USAFETAC FROM SUMMA'Y OF DAY DATA


STATION NUMBER: 03562! STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 55-7

...............................................................................................................................

TEMPIFII JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANNUALto~~t oo ............................................................joeeH...................................

GE V'I . .0

GE 751 .7 1.2 .5 .1 2

bE 7!I .1 2.6 6.6 5.6 .4 .1 1.3G 651 1.2 I0.4 26.0 24.3 7.2 1.2 5.9

GE b| .i .7 8.6 17.3 64.8 62.6 !.3 7.j .2 1B.CGE 551 .2 1.6 8.7 33.4 77,2 96.1 96.6 77.3 30.3 3.5 1.2 35.5

GE Sri 2.9 3.2 9.8 32.3 75.7 97.7 99.9 llC.0 -6.3

66.1 18.3 7.8 50.8

GE 451 18.8 1.b 35.o 65 5. .7 99.9 I0.0 99.9 91.4 7.1 Z7 .5 66.6GE 41 46.8 46.7 70.7 91.2 99.9 100.3 11t.0 99.3 8U.5 56.6 82 .6

b E 35I 71.9 74.5 92.5 99.6 100.0 1c0.0 96.1 E2.8 93.1GE 3'1 91.1 9"., 99.4 10l.0 99.5 95.3 98.3

GE 251 97.9 99.2 99.9 100.0 69.5 99.7

GE 2c1 99.6 100.3 1C.0 1(0.2 100.0GE 151 99.8 10.0CGE I IGG.0 "cc .0

.. . . . . . . . . . . ............................................... ............................•9 : i .... .... .... : . . ....... :......

MEAN I 38.4 3.B 4Z.4 46.9 52.7 8. 3 61.8 61.5 97.8 51.8 44.2 40.5 49.6so 6.573 6.073 5.48b 5.371 4.845 5.G26 4.811 4.526 4.613 5.346 5.731 6.396 17.C63

TOTAL 0BS I 9S3 863 946 889 922 898 93J 930 916 934 916 954 11053...............................................................................................................................

GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF MAXIMUM TEMPERITURE

L SAFETA C IFROM DAILY OBSLQVATIONSI

AIR w[ATCFR SERVICE/MAC

SIATICN NUM1ER: 05623 STATION NAME: RAF ALCO48URY UNITED KINGDOM PEPIOD OF RECORD: 55-p?

WlOLE DEGREES FAHRENPEIT

-O-N-T-H-S- ALLYEAR J JAN FEb MAP APR MAY JUN JUL AUG SEp OCT NOv EEC MONTIS

55 1 *71 67 62 58

5b *5257 *56 '66 *6 72 90 85 77 69 66 54 5656 55 SR 5 70 75 74 79 78 78 63 55 5 7959 5A 63 b2 66 79 83 91 RN 82 78 se SN 91

6L 1 54 6n 59 64 75 83 71 73 73 65 60 S 83

61 f 52 59 69 65 73 64 85 86 81 70 58 57 86Iz NM 5 56 67 67 77 79 72 75 67 56 56 79

63 4C 42 57 6b 80 78 8D 73 75 69 61 53 so6M S2 55 53 68 78 73 77 89 76 66 57 56 8965 S2 N 8 71 62 80 74 72 76 70 7 59 56 R6

6b SA 57 55 69 77 8c 74 78 72 6e 5. 54 so

67 54 55 b5 67 75 72 63 77 73 69 62 54 838 5N 4S 77 75 72 61 88 81 77 68 57 52 88

69 56 M9 57 72 7M 77 90 VT 73 77 6S 52 907 I 49 54 61 6I 72 R! 8 RI 79 70 63 53 88

71 51 5 55 71 71 73 82 75 77 73 62 59 82

72 51 51 66 60 66 69 -66 *62 59 5773 51 53 64 62 73 80 78 R6 82 69 59 53 Rb

74 sN N3 62 66 68 73 73 77 69 55 N7 62 7775 59 SS 55 66 69 82 8 91 73 62 55 53 9176 57 59 59 66 75 93 93 8A 73 68 SS 46 9377 53 S1 62 64 73 73 80 77 73 b8 62 57 AC76 1 s 53 60 55 78 78 73 75 77 75 6

2 57 78

79 46 Me 55 69 *78 *75 80 77 TS 66 57 .57 R0

63 * 4 54 55 73 72 Al *79 77 73 66 -61 -55 al81 *S2 55 63 *66 *70 73 .A! 79 75 *64 -61 .50 081

82 1 '52 S 61 66 77 82 82 82 *75 *63 *63 57 82

83 57 *53 57 64 70 75 91 86 75 73 59 52 9184 5 54 52 *63 86 86 77 66 63 -54

NOTES * (BASED ON LESS 71MN FULL MONIHSI

V iAT LEAST ONE DAY LESS THAN 24 OBS

CONTINLED ON NEXT PANE....

7I

GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF MAXIMUM TEMPERATURE

USAFETAC IFROM DAILY OBSERVATIONS)AIR wEA TI-ER SERVICE1M *CaSTATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PEPIOD OF RECORD: 55-87

- WHOLE DEGREES FAHRENHEIT7LI -M -O-N-/- - S - ALL

YEAR I JAN FEB MAR APR MAy JUN JUL AUG SEP OCT NOY LEC MONTHS

................................................................ ................ ....... ....... ...... ...... ...... .........

86 I 54 39 *55 57 0 Al 8 73 68 66 55 57 RI

87 i so 54 54 7n 70 81 8 8 73

................................................................................................................................................MEAN I 52.5 53.1 59.9 65.7 73.3 78.4 818 79.7 74.9 68.6 59.0 5S.1 84.2

S.O I 3.577 5.269 5.740 R.494 3.811 5.S32 6.027 5.159 3.678 5.251 2.975 3.2.3 5.050TOTAL OBS | 953 863 946 889 922 898 930 q3D Q18 934 916 154 11C53

NOTES I BASED ON LESS THAN FULL MONTHS)I (AT LEAST ONE DAY LESS TAN 24 085)

C

C

S

0 GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF MINIMUM TEMPERATUREUSAF ETA C IFROM DAILY OBSERVATIONS)

AIR . EATI-ER SERVICE/MAC


WHOLE DEGREES FAHRENHEITS-M-O-N-T.H..S- ALL

YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV CEC MONTHS

......................................................................................................................................55 30 2 2

56 *2657 I *27 ' *38 32 42 50 N6 37 35 29 25sa 18 2s 23 26 37 Nq 45 47 39 37 31 3T 159 19 29 35 36 35 NV NV 4S N3 35 23 30 19

60 23 26 29 32 39 V5 V5 N6 VI 35 32 29 2361 1 26 34 30 35 35 43 V5 N6 NV 31 2N is is

62 20 2S 21 32 3V 35 VS NV 40 30 ZN 17 1763 5 14 2 32 35 N5 N2 43 N0 39 32 16 564 1$ 21 ZN 33 39 NO 46 V3 39 32 21 18 IA65 26 25 11 27 33 N2 38 N6 V3 34 23 21 1166 1 Z8 2 31 35 36 VS N3 41 35 30 27 is

67 23 29 31 26 31 41 Nb NV 39 37 28 2 2368 17 21 26 2 36 VS N6 NV N2 V2 30 2' 17

69 3o IS 27 30 39 37 N8 VN 36 N2 26 28 is70 21 2 15 26 N2 N2 46 NV NV 37 2 26 is

71 24 28 ZN 33 35 N2 NV N6 NV 35 28 33 2472 17 3 , 30 33 39 N2 *50 -3S so 2873 28 21 28 28 37 41 '12 Nb NZ 2 21 19 19

7N 21 28 26 35 3S 44 NV 33 33 3C 35 21

75 33 2 30 28 37 39 N8 NV 39 33 26 26 276 26 2R 26 30 37 42 V8 N6 NV 37 32 21 21

77 26 28 3C 28 33 41 N6 N6 NV V1 28 2 2678 f 24 17 30 28 39 N2 NV N6 NV 37 21 21 17

79 17 2N 3C 32 '32 'NV NV NV 37 36 27 30 17

VI O '2T

28 27 32 32 VS VS N6 NA 3V '32 '29 '23

81 *28 25 34 3C *34 3 *6 N5 'N * 3 V *3N 09 019

82 * 1 9 28 23 32 N8 Nb N8 #43 *39 'Zs 25 *183 28 21 3C 32 39 N6 N6 N8 N6 28 2: ZS *218N 25 23 30 *46 N6 N8 V3 3V 36 02

NOTES * IBASED ON LESS THIN FULL MONTHS)

A IAT LEAST ONE DAY LESS THAN ZN OBSI

CONTINUED ON NEXT PAGE....

-2

GLOBAL CLIMATOLOGY BRANCH EXTREME VALUES OF MjII4U- TEMPERATUREUSAFETAC IFROM DAILY OBSERVTIONS)

AIR WEATHER SERVICE/MAC0STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PEPIOD OF RECORD: 55-87

WHOLE DEGRFES FAHRENHEIT

t -O--N- -J--S- ALLY EAR I JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV LEC MONTHS

85 14 19 28 *30 37 39 46 45 43 36 27 2! 148b I 25 12 *23 30 39 41 46 41 37 37 36 32 1287 I 14 2S 25 37 36 39 46 45 39

MEN Z. 6 23.9 Z6. 30.3 6.0 4 4 35.0 27.6 25.D 18.3S.D. | 5.989 5.175 .0s 3.627 2.755 2.944 2.301 1.626 3.406 3.651 4.138 4.S65 4.879

TOTAL OBS I 953 863 946 889 922 99 930 930 918 934 916 954 11US3

NOTES s (BASED ON LESS THAN FULL MONTHS)A (AT LEAST ONE OAY LESS TI-AN 24 OBS

C-'

-Jo

GLOBAL CLIMATOLOGT BRANCH DRY-BULB TEMPERATURES DEr. F FRO" MEANS AND STANDARD DEVIATIONS

LSAFETAC HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PEQIOD OF RECORD: 77-87

HOURSI STATS JA MAR APR MA G SEP OCT ALST I I... MEAN I 15.5 34.2 . ... 4 2.6 46.3 52.1 57.4 6.9 . . 4 9.7 3.4 41.7 46.

D0-021 SD I 7.013 7.C44 5.144 5.227 4.47Z 4.927 5.216 5.016 5.575 6.515 6.758 7.131 9.716

{hOT OS| 418 399 446 390 405 482 575 597 549 554 478 472 5767

.. .. . ... .. . . .. .. .. . . . .... . ... . ... ...... 4NEN I 33.7 4. 31.8 41. S.2 11 5. 5.1 32.3 '., 432 .4 4.

03-51 SO I 7.207 6.841 S.233 S.10 4.638 4.808 4.707 4.878 3.430 6.437 7.234 7.399 9.258

ITOT OBSI 712 682 783 636 661 704 797 AID 780 796 726 726 8863

...........................................................................................................................................MEAN 35.7 34.2 38.6 42.6 48.2 54. 58.3 51 33.4 48.Z 42.9 4.1 46.3

06-081 SO I 7.333 7.71 37 3.082 4.894 ,.69Z 4.617 4.739 3.394 6.361 7.460 7.350 10.089

IIOT OBSI 820 760 899 728 727 747 652 867 818 810 770 B8 9566

MEAN I 17.1 36.6 42.7 47.7 33.7 59.5 64.0 63.5 59.6 52.9 45.2 41.3 50.509-111 So I 7.158 6.S81 S.280 5.816 5.903 5.554 3.778 5.270 5.117 5.925 7.000 7.083 J1.364

ITO7 0831 859 793 889 779 778 786 893 910 837 834 790 851 10G19

........................................................................................................................................| MEAN I 39.S 39.7 43.1 50.8 56.7 62.3 67.5 67.0 63.3 56.3 48.1 43.6 53.4

12-141 so | 6.810 6.366 5.49a 6.8G8 6.625 6.463 6.946 6.175 3.325 5.743 6.501 6.692 11.79z1T01 OBS1 912 838 930 797 806 804 917 930 874 857 829 902 10396

.... .....I N '' 39.0 39 ;:. . 43.7 0.8 3.. .. 7.0 62. 6 8:'': . ....3" '61.4" 6";3. . .53.8"" 41''.2 4 2.8" 53.2' ;:''

15-171 So 1 6.722 6.588 5.360 7.166 6.949 6.703 7.112 6.337 5.751 5.913 6.579 6.666 12.111

ITOT Oesl 915 837 922 763 767 781 892 9'5 853 839 823 903 10202......N ... .. .. ..... ... ..... .... ... ............ .............. 7 ; ; ; :......... ..... ;6 7 ; 5I MEAN 1 37.2 36.9 42.3 47.3 53.% 59.6 65.4 63.7 58.8 %2.2 44.9 41.4 50.3

18-201 SO I 6.855 6.628 3.218 6.555 6.316 6.304 6.609 6.160 5.60Z 5.800 6-628 6.925 11.650

lOT 081 769 705 791 640 639 690 776 793 734 733 712 757 8739

......................................................................................................................................I EA 36.4 '33.7 f$E.. 44.4 48.9 53.1 60.4 59.2 53.3 30.3 43.7 60.9 47.221-231 So | 7.031 6.663 5.132 5.663 5.214 5.281 S.387 S.264 5*.22 6.070 6.743 7.367 10.379

ITOT OBS1 747 684 734 516 321 586 675 689 637 635 683 735 7864;;... .. .. .. ... .. ;... .. .. .1. .. .. .. .. .. ... .. .. .. . 6... ..6 ..; ... ... .. .. ..9........ ......I MEAN 37.2 36.7 41.7 46.4 5.8 S7S 62.4 61.6 57.8 31.9 45.0 41.6 49.%

ALL I SO I 7.136 7.61 6.13

U 7.044 7.250 7.079 7.329 7€175 6.920 6.823 1.111 7.152 11.359HOURSITOT OBS 6182 5698 6346 5269 3304 SS80 6377 6501 6102 60?8 3815 e164 71416

................................................................... .........................................................................

.I.

GLOBAL CLIMATOLOGY BRANCH WEI-BULB TEMPERAIURES DEG F FROM MEANS AND STANDARD DEVIAIIONSUSAFETAC HOURLY OBSERVA TIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURT UNITED KINGDOM PERIOD OF RECORD: 77-87

HOURS STATS I JAN P MAY JUN OC NOV DEC ANN

LST | I............... ........ ....................................................................................................

I MEAN 1 !3.3 32.1 35.1 39.9 463.8 49.4 SN. 3 S4.0 50.8a 47.0 "10.7 38.7 4.4.200-021 so 1 6.607 7.048 4.99b 5.5f0 4.543 4.854 5.000 4.741 5.629 6.427 6.628 6.743 9.470

IOT ORSRI 418 399 414 390 405 482 575 597 549 554 478 472 5767O~~~ss ;~. .. ..... o.... . . .. . . . . .. ..

I MEAN I 33.6 32.6 3. 38.9 43.0 48.7 52.8 52.6 50.0 46.0 40.5 37.8 42.9

03-OSI SO 1 7.050 6.821 5.294 5.195 4.64 4.659 4.664 4.759 5.407 6.410 7.076 6.969 9.1101101 O6S ?42 682 783 656 659 704 797 810 780 796 726 725 8860

....... ................................................ . .... . ........ ......... ...q ' 0 8 S ; .. . .......... . . . . .

.AN I 33.6 "32.5 35.4 51.0 55.0 54.2 50.B 45.B N0.3 37.4 43.7

06-081 So 1 7.145 6.961 5.N34 5.080 4.611 4.558 4.366 4.492 5.258 6.575 7.255 6.953 9.626

ITOT 0831 820 ?6 0 849 728 724 747 asZ 867 818 810 770 818 9563

I MEAN | 34.8 34.5 39.7 43.5 48.6 53.8 57.8 57.2 SN*3 49.1 42.0 IA8.6 46.3

09-111 SO i 6.682 6.493 5.231 5.3 4 .923 .904 .747 4.420 4.52 5.561 6.75z 6.673 9.905

IOT OBS1 859 793 889 779 777 786 893 910 857 834 790 as8 10017

I MEAN I 36.7 36.8 "i.S 45.0 49.9 55.0 59.1 58.5 S5.? 50.9 44.0 40.4 47.8

12-141 So I 6.504 6.313 5.266 5.610 5.109 5.198 5.091 4.669 4.714 5.224 6.260 6.274 9.665IIOT OBSI 912 838

93U 797 806 804 917 930 874 857 829 901 10395

I MEAN I 36.3 36.7 41.4 44.9 SO.1 55.1 59.1 58.6 5.6 50.4 43.5 39.7 47.615-171 S0 I 6.489 6.416 5.101 5.846 5.167 5.166 5.011 4.618 4.801 5.375 6.421 6.294 9.854

1101 OS1 915 837 922 763 767 781 892 905 653 839 825 903 10202

.. .................................. ........ . o ;; ... ... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ...... .. ..I MEAN I 3.8 34.7 3, 4..0 48.2 53.9 58.4 7.1 53.5 483;1. 38.6 46.0

18-20! SO I 6.604 6.591 5.231 5.812 5*138 1.066 4.941 4.647 5.021 5.614 6.450 6.507 9.993

IT7OT oS 769 705 791 60 639 690 776 793 734 733 712 757 8739

.......................................................................................................................................SMEAN I 34.1 33.7 37b. 41.2 45.6 51.4 56.0 5s. 51.6 47.1 40.8 38.2 44.121-231 SO I 6.763 6.637 5.282 5.601 4.910 4.874 4.927 4.677 S.459 6.016 6.524 6.934 9.663

ITOT OeSI 747 68q 73,4 516 521 586 675 689 637 655 685 735 7864

.I MEAN I ..4.8 34.4 38.7 42.3 47.2 *2.5 56.8 56.1 %3.0 48.2 41.8 38.7 45.5ALL I SO I 6.89 6.841 5;686 S5.929 5.532 5.465 5.361 5.081 5.515 6.172 6.810 6.717 9.839

HOURSITOY OBSI 6182 5698 6346 5269 5298 5580 6377 6101 6102 6078 58i5 6161 71407

3

'-41

GLOBAL CLIMATOLOGY BRANCH DEW-POINT TEMPERATURES 0EG F FROM MEANS AND STANDARD DEVIATIONSUSAFETAC HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCONBURY UNITED KINGDOM PERIOD OF RECORD: 77-A7

LS? I I

M00 E AN I 29.5 28.1 31.8 36.4 40.8 46.8 51.8 51.6 48.3 44.1 37.2 IN4.5 41.00001SD 1 7 .4114 8 .729 5.997 6.940 5.599 5.5146 5.634 5.178 6.369 ?.2148 7.670 7.734 10.512

ITOT OBSI 418 399 4148 390 405 482 575 597 5149 5514 478 1472 5767..................................................... ............. o ......................... .................................... o........

I MEAN 1 29.9 29.1 32 .8 35.8 40. 46.3 50.8 50.6 147.8 43.5 17.1 13.9 40.103-051 S0 1 8.263 8.281 6.025 6.356 5.1468 5.5145 5.1801 S.211 6.0(32 1.235 8.041 1.911 10.144

110T OBSI 7142 682 783 656 659 7014 7 AID 780 796 726 725 B860.......................................................................o o .............. .... .... ... .............................. ...............

9MEAN I 30.0 29.1 33.6 36.9 42.3 47.9 52.3 S. 48.14 413.1 36.9 33.6 40.606-081 so 1 8.279 8.237 6.1476 6.1147 5.1415 5.389 4.967 14.983 5.825 7.1483 8.188 7.942 10.1458

9101 0811 820 760 8148 728 7214 7147 852 867 818 81Q 770 818 9163

IMN I 309 31.0 35.8 38.3 43.14 48.8 53.0 S2. 3 49.9 45.14 38.1 14.6 41.999-11,10 so 7.864 1.7S8 6.176 6.589 6.187 6.101 S.734 5.568 S.6141 6*14b2 7.688 7.646 10.253

0O 110 081 859 793 889 779 771 786 893 910 857 8314 190 &5o 10017....................................................... ...o ............................................................... ..............

! EN 2.4 32.3 36 .1 38.2 43.1 48.8 52.8 51.8 49.14 45.5 39.3 36 . 1 42.212-11 So 1 7.591 7.715 6.9914 6.984 6.718 6.290 6.170 6.068 6.269 6.615 1.5143 7.27b 9.943

1101 0811 91? 838 93U 791 806 8014 917 930 8714 857 829 901 10395............................................ .a........... ......................................................

I EN 21 32:1 3S6 3. 4. 4. 28 5. 4. 4S. 391 57 14.15-171 s0 I 1.654 7.9149 7.039 7.1114 6.S34 6.171 6.080 S.976 6.3140 6.757 7.692 7.Z143 10.039

To0 T Os9 915 837 922 763 767 781 892 905 893 839 825 903 10202.................................................. ......o ................................................ ............................... ...........

I MEAN 3 0.9 30.9 34.8 37.8 142.8 49.0 S3.2 51.8 148. 7 44.3 37.6 314.6 141.4

18-101 0 7.70? 8.006 6.695 6.96q 6.328 5.839 5.188 S.102 6.105 6.683 7.567 1.1470 10.3219110089 769 70 5 791 6140 639 690 776 793 734 733 712 757 8739

I MEAN 1 '0.2 30.3 33.9 37.1 41.8 48.1 52.5 51.6 48.2 43.9 37.0 34.2 40.521-231 SD 1 7.831 8.54 6.536 6.823 5.956 5.684 5.704 5.367 6.3S1 6.923 7.1461 7.819 10.1400

9101 08S1 1147 6814 7314 516 521 586 675 689 637 655 665 735 7864...................................................................o.o................. .............. o ............ ................... ......... I

I MEAN 1 10.9 30.6 314.s 37.4 42.14 48.1 52.14 51.7 48.8 414 .14 37.9 314 7 1 41.3ALL I SD 1 7.904 6.1145 6.752 6.78? 6.170 5.927 5.725 5.560 6.131 6.968 769 7.655 10.264

I4QURSITOT 0859 818Z 5698 63146 5269 5298 5580 6377 , 6501 6102 6078 5815 14161 71140?

.. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . .o. . . . . . . . ... . . . . .o .. . o. . . .

:.r v -. . I . -" - - •

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF oCCURRENCE RELATIVE HUMIDITY

u SAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

) STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: JAN

) MONTHI HOURS I PERCENTAGE FREQUENCY OF RELATIVE HUMIDITY GREATER THAN I MEAN I TOTALLI 1.. ............... ... IRELATIVEI NUP

DI 101 20 301 402 505 602 500 %Ot 90t IHUMIOITYI OBS I................................................................................................................................I

JAN 00-02 100.0 100.0 100.0 100.0 100.0 95.9 78.2 47.6 10.3 78.9 41E

03-05 20.0 10.0 100.0 100.0 100.0 96.5 79.0 46.5 15.0 79.9 74Z

I 06-08 1 100.0 100.0 100.0 100.0 100.0 98.3 80.1 47.3 14.3 80.0 82BL

C9-11 100.0 100.0 100.0 100.0 100.0 97.3 75.7 41.4 13.3 78.7 85

IZ-14I1 100.0 100.0 100.0 100.0 99.5 90.6 66.0 37.1 10.5 76.2 91i

I-17 I100.0 100.0 100.0 100.0 99.5 91.5 67.0 36.4 10.8 76.7 91S

I18-20 100.0 100.0 100.0 100.0 100.0 9.9 71.8 43.3 13.4 78.4 764

21-23 100.0 100.0 100.0 100.0 100.0 * 95.0 71.6 43.0 13.4 78.8 74

:IOTALS 100.0 100.0 100.0 100.0 99.9 95.0 74.1 *2.8 1.6 78.5 6182........................................... ............... ...................................................................

0

-I

*

/ 1~ ~- 7 -H ! a p n vp ,- -- . .

GLOBAL CLIWPIOLOG BRANCH CLMULATIVE PERCENTAGE FREQUENCY OF OCCLRRENCE RELATIVE HUMIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NkAL: RAF ALCO4BURY UNITED KINGDOM PERIOD OF RECORD: 78-87MONTH: FED

lONTHI HOURS I PERCENTAGE FREQUENCT OF RELATIVE HUMIDITY GREATER THAN I MEAN I TOTAL

I ILS1I) ..................... ;................................................... IRELATIVCI Nul,l I 108 20% 308 908 Sol 608 701 out 90t IHUMIOITY| OB I

I IFEB 00-02 100.0 1 0.0 100.0 100.0 99.7 95.5 17.1 43.9 12.0 78.8 399

03-OS 100.0 100.0 100.0 100.0 99.6 97.5 6S.S 53.4 19.9 81.9 682

06-08 100.0 100.0 100.0 100.0 100.0 98.2 87.0 55.9 22.0 82.2 76C

09-11 100.0 O10.0 100.0 99.9 99.6 96.1 83.4 51.6 16.5 60.5 793

12-191 100.0 100.0 100.0 99o3 97.7 69.6 65.9 32.0 8.0 75.3 836

I 15-17 I100.0 100.0 100.0 99.6 97. 88.2 62.8 32.6 8.S 74.9 837

I 18-20 300.0 100.0 100.0 100.0 99.9 96.0 77.6 99.7 Iss 79.1 705

21-23 1 100.0 100.0 100.0 100.0 100.0 98.0 81.7 53.9 17.9 80.8 66'

- ITOTALS 1 100.0 100.0 300.0 99.9 99.2 99.9 77.7 95.9 15.0 79.1 569E

.

0

C

U2

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR wEA11HER SERVICEIMAC

STATION NUMB0ER: 03S623 STATION NAME: RAF ALCONSURY UNITED KINGDOM PERIOD OF RECORD: 74-87MONTH: MAR

ILS11 I..........................................................................................NUPlo10 202 301 40 1 502 631 701 so% 901 IHUMI 0I1TYvI 083K). . . .................................................................

MAR I GO-02 1 00.0 100.0 100.0 100.0 100.0 98.2 81.7 45.5 10.0 79.4 444kI

I 6-08 100.0 100.0 100.0 100.0 100.0 99.3 88.5 62.? 20.4 82.8 84"

1 09-11 1 100.0 100.0 100.0 100.0 99.2 91.7 69.0 38.5 14.2 77.2 88,I I

C15-17 1 100.0 100.0 100.0 98.5 88.4 70.9 45.4 21.6 6.8 68.9 92;

I 18-20 1 100.0 100.0 100.0 100.0 97.s 88.2 60.7 36.4 10.5 75.4 791

I I121-23 1I 10.0 100.0 100.0 100.0 99.6 96.9 76.3 45.0 13.9 79.2 734

o IOTALS 1 200.0 100.0 100.0 99.8 96.9 89.8 70.0 41.4 12.7 76.9 634t........................................................................ ............... ..............................................

0

0

CLBLCIAOOYBAC U LTV ~¢NA[F[ C FOCR(C [A|[HHOl

C SFTCFO OUL SRA|N

C-.[IHBSRVC/A

J.SA|NNM[:0S2 TTO A[ A LCMUYUZ[ IGO (IDO (OO A8

NONTH: MA2 ioell,•.leoo, eeo.•o •ol.,~ .,,eee~ie~eee

GLOBAL CL1I4AIOLOGV BRANCH CUMULAI1V( PERCENTAGE FRGEQUENCY Of OCCURRENCE RELATIVE PUMIDITY

USAFETAC FROM HOURLY OBSERVATIONSAIR ALATMER SERVICEIMAC

STATION NP SER: 0315623 STATION NAME: RAF ALCOVBIJT UNITED KINGDOM PERIOD OF RECORD: 78-83,85-97MONTP: APR

MNOII HOURS I PLRCENTAGE FREQuENCY OF RELATIVE HUMIDITY GREATER THAN MEAN I TOTOL IIILSII ....................................... IRELATIVEI NUpM

I iot 201 3L, % 80 So bot 70o 801 90t IHUMIDITYI 00 I

APR I 00-02 1 100.0 10o.0 100.0 100.0 99.2 95.6 76.7 48.1 15.4 78.9 39L

I II 03-05 1 100.0 120.0 100.0 100.0 100.0 98.S 85.1 54.6 20.0 81.s 65t

I G rS Ii 6- 1 100.0 1 O,.0 1GO.3 100.0 100.0 98.1 82.6 49.3 16.1 63.s 72k

1 09-11 IG0.0 100.0 IOC.0 99.6 98.2 79.5 So.8

21.7 6.7 70.9 77S

I II12-1 100.0 oo.0 99.7 96.5 80.8 56.2 32.0 12.3 3.8 63.8 797

I 15-17 I 100.0 100.0 99.5 95.3 80.s 58.3 31.2 11.1 3.8 63.0 763

I 16-20 I 100.0 100.0 100.0 98.9 98.5 78.9 S0.8 2C.9 S.6 70.6 64L

21-23 |OIo. 110.0 1oc.0 100.0 99.8 92.4 67.8 32.2 11.0 76.1 516

II0TALS 1 100.0 100.0 99.9 98.8 93.6 $1.7 S9.5 3D.8 10.5 73.1 52b

....................................................................................................................................

,0 * • *, * * * ,o * * * e * * *o * **o * * * * * * * * * * ** * * * * * *** * * * o o * * * * *

GLOBAL CLIMAIOLOGY BRANCH CUMULATIVE PLRCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDIlY

USAo(TAC FROM HOLRLY OBSERVATIONY


STATION NUMBER: 035623 STATION NAME: RAF ALCOMBURT UNITED KINGDOM PERIOD OF RECORD: 78-83,5-7MONTH: MAY

SHTF RELATIeV HUMI GREATER THAN MAN TOTAL

I AESTI..................................................................................... IRELATIVEI NUP I

I I lot 201 30% 402 50t 60% 70 80% 90: IHUMIOITTI 085 I

................................... ................................................................ ..........................I I

MAY I CO-O2 1 100.0 100.0 100.0 100.0 100.0 99.) 83.0 52.1 26.7 81.5 405

I 03-05 1 100.0 100.0 100.0 100.0 100.0 99.5 90.3 61.2 Zs. 83.8 655

I C6-08 1 100.0 100.0 130.0 100.0 100.0 97.2 82.5 49.4 21.4 80.5 7Z4

I09-11 I 100.0 10. 0 100.0 98.5 90.9 73.1 48.0 22.9 6.3 69.3 777

I 12-14 1 100.0 100.0 98.6 93.1 75.7 50.5 32.5 13.6 3.5 62.2 AoL

15-17 100.0 100.0 98.3 92.0 76.0 53.1 JO.4 11.9 3.1 61.8 767

S18-20 1 oo.0 100.0 100.0 97.7 88.1 70.7 49.0 21.3 6.3 68.7 639

1 21-23 i 100.0 100.0 100.0 99.8 99.6 92.5 7A.1 38.2 IA.4 77.3 521

ITOTALS I 100.0 100.0 99.6 97.6 91.3 79.S 61.2 33.8 13.7 73.1 529t.................................... ...........................................................................................

6LORAL CLIMATOL06T BRANCH CUMUJLATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE 4 UMIDITYus A E TAC FROM H4CuRLY OBSERVATIONSAIR WEA THER SERVICE/MAC

STATION NIMMER: 035623 STATION NAME: RAF ALCOIBURY UNITED KINGDOM PERIOD OF RECORD: 78-87MON~IP: JUN

MONI4 HUR IPERCENTAGE FREQUENCY OF RELATIVE HUMAIDITY GREATER THAN IMEAN I TOT#LSI .. . ... . . . .. . . .. . . . .. .. ... .. .. . . . .. . . . IRELAIVEI NUPF

10I2o 201 SOY N01 5OY 60t 7O1 Sol 90: IHUMIDITYI OR!.................................................................................................................................

JUN IUO-02 100.0 100.0 100.0 100.0 100.0 9909 95.2 54.6 18.5 82.3 1482

03-05 I 00.0 100.0 100.0 100.0 100.0 100.0 96.9 60.9 22.2 83.8 70&,

G 6-O08 100.0 100.0 100.0 lor.0 100.0 97 .3 AS.1 37.5 12.2 T8.? T47

0 9-11 I 100.0 100.0 100.0 100.0 95.0 70.6 42.7 15.0 3.8 68.5 Tat

1 12-16 1 100.0 100.0 100.0 9A.0 83.3 50.9 26.N 9.2 1.7 62.4 Ro&.

I15-17 I 100.2 100.0 100.0 97.6 81.9 68.7 26.4 10.1 2.61 62.3 78l

I 1-20 100.0 100.0 100.0 99.6 93.3 71.4 61.6 1N .8 4.2 68.9 69[

1 21-23 1 100.0 100.0 100.0 100.0 99.8 95.7 79.9 37.2 10.6 77.6 58t,

I TOTALS 1 100.0 100.0 100.0 99.6 96.2 79.3 62.5 30.6 9.5 71.1 558c.....................................................................................................................................

GLOBAL CLIMAIOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDITYUSAF TAC FROM HOURLY OBSERVATIONSAlR WEATHER SEOVICEIMAC

STATION NUMBER: 0356Z3 S T ATION NAME : RAF ALCOVOURY UNITED KINGOM PERIOD OF RECORD: 78-87

MONTH: JUL

L3C 10. 2l-2T 10. 100.0 100.0 100.0 99.9 98.9 90.5 71.0 317 997. 79

T-OL 100.0 10 100.0 99.9 9.1 90. 97.B 59 . 3 1 1. 78. 67!

I1O-A7 100.c 100 99.9 9e1 690,4 7.8 59.9 71.1 1.6 79.2 6397

..........................................................................................................................................C62 O• ~ 0 9e 79 8• 17 qo k2 q 6• 7

1.Z Oe 0e O~O 9* eS Qe 1. 17 987, 7

Kl~L O* 0, 99 9~ 0. e 5. 11 |, Z2 67

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PEqCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR wEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME; RAF ALCOYBURY UNITED KINGDOM PERIOD OF RECORD: 78-87

MONTH: AUG

MONTHI HOURS I PERCENTAGE FREQUENCY OF RELATIVE HUMIDITY GREATER THAN I MEAN TOTAL

I ILST) I............................................................................. IRELATIVEI NUM II I 102 202 302 40% so 602 7% 80 90: IHUMIDITYI OBS I

................................................................................ ......................................................

AUG rO-D2 100.0 100.0 100.0 100.0 99.8 99.3 92.3 56.4 19.1 sZ.8 597

03-05 100.0 100.0 100.0 100.0 100.0 I0.0 98.5 67.4 22.6 85.1 81L

06-08 100.0 100.0 100.0 100.0 100.0 991.4 91.3 51. 16.7 81.8 867

09-11 100.0 100.0 100.0 99.L 94.5 68.1 42.1 14.9 N.- 67.0 911

12-1 100.0 100.0 99.9 94.7 70.9 39.5 24.3 9.0 1.6 q9.6 93C

15-17 100.0 100.0 99.8 92.0 66.2 38.5 22.0 9.3 2.2 58.7 90E

I.18-20 I100.0 100.0 99.9 98.0 87.9 62.2 39.8 15.5 5.7 66.6 793

21-23 Io.0 100.O 100.0 100.0 98.8 91.3 74.3 32.7 11.2 76.6 684

ITOTALS Iooo 100.0 100.0 98.0 89.8 74.8 60.6 32.0 10.4 72.4 6501

....................................................................................................................

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE IPUMIDITYDUSAFETAC FROM HOURLY OBSERVATIONS

AIR WEATHER SERVICE/NAC

STATION NUMBER: 035623 STATION NAME: RAF' ALCOAIBURY UNITED KINGDOM PERIOD OF RECORD: 78-8?MONTH: SEP

...............................................................................................................................................MON7T41 IOURS I PERCENTAGE FREQUENCY Or RELATIVE HUMIDITY GREATER TH4AN IMEAN I TOTAL

IILSTI I..............................................................................IRELATIVEI NUMI C% 20R 302 4O% s0% 602 70% 80x 90: IHUMIOITYl oss

...................................................................................... .........................................................I I

SEP 1 00-02 1 100.0 100.0 100.0 100.0 100.0 99.8 94.7 56.3 17.5 82.8 549

I03-O05 1001.0 100.0 100.0 100.0 100.0 99.9 98.1 65.8 Z4.4 84.8 781

I 6i I 100 0. 100.0 100.0 100.0 99.3 95.5 58.1 20.7 83.3 81

1 09-11 1 100.0 100.0 100.0 100.0 97.0 78.8 53.4 20.1 5.4 71.2 851

I12-14 I 100.0 100.0 99.8 97.9 82.7 45.2 26.2 7.7 1.9 61.6 814

I15-17 I 10.0 100.0 99.4 96.7 80.7 46.n 25.1 7.4 1.3 61.1 853

1 18-20 I 100.0 100.0 100.0 99.7 96.3 77.4 51.5 16.2 3.1 69.9 734

I21-23 I 100.0 100.0 100.0 100.0 100.0 97.5 78.8 33.3 7.1 77.2 637

OITOTALS 1 100.0 100.0 99.9 99. 3 94.6 80.5 65.4 33.1 10.2 74.0Q 6102.............................................................. ..................... ...................... ....... .............. ...........

-j/

J

r~

0m -

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BLRY UNITED KINGDOM PERIOD OF RECORD: 77-86MONTP: OCT

..... US..... . .. .............................................. . o............................ ' ' '" ' ' ' ' 'MONTH HOURS PERCENTAGE FREQUENCY OF RELATIVE HUMIDITY GREATER THAN I MEAN I TOTAL I

I (LST) I................. o ........................................IRELATIVEI NUM II I 102 20% 312 401 502 602 70% 80 902 IHUMIOITI OBS I

.............................................................................................................................

OCT 10-oz 100.0 100.0 100.0 OC.0 100.0 98.9 89.2 54.2 11.6 81.2 554

03-05 100.0 100.0 100.0 100.0 100.0 99.6 92.6 58.8 20.9 83.1 796

06-08 100.0 100.0 100.0 100.0 100.0 99.4 91.0 $6.9 18.3 82.5 si

1 09-11 1 100.0 100.0 100.0 100.0 99.8 92.7 73.5 29.4 7.3 75.9 834

1 12-14 IC0.0 100.0 IDD.0 99.4 94.7 70.9 40.6 13.3 2.8 67.5 857

1 15-17 1 100.0 100.0 99.9 99.6 94.9 73.3 45.8 15.0 2.7 68.2 839

I18-2C 1 100.0 100.0 100.0 100.0 99.6 93.5 71.4 25.9 3.8 7,.B 733

21-23 100.0 100.0 100.0 100.0 100.0 98.2 84o3 38.0 5.5 78.3 655

ITOTALS 100.0 100.0 100. 0 99.9 98.6 90.8 73.6 36. 9.1 76.4 607E................................................................................... ...... ........ . ........ ................. ..

©

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE hUMIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICE/MAC

STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURy UNITED KINGDOM PERIOD OF RECORD: 77-8bMONTH: NOV

0 OYIPUSPERCENYAGE FREQUENCY OF RELATIVE HUMIDITY GREATER THAN i MEAN I TOYAL

I ILST) I .......................................... ............. .................... IRELATIVEI Nu II I 101 202 302 40 502 602 701 801 90t IHUMIOITYI 09O I

.. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .................................

NOV 0-02 I 100O. 100.0 100.0 100.0 100.0 98.5 78.5 42.1 11.! 79.0 q76

03-05 I00.0 100.0 100.0 100.0 100.0 98.5 81.3 40.8 87 79.2 72C

06-08 1 100.0 100.0 100.0 100.0 100.0 99.0 82.2 44.0 7.0 79.3 77L

09-1I lo00O 100.0 100.0 100.0 99.7 96.7 71.4 33.7 5.3 76.6 79C

1 12-14 I 100.0 100.0 100.0 99.8 97.2 86.9 56.7 22.Z 3.6 72.3 825

O 15-17 100.0 100.0 1OO.C 100.0 98.5 89.o 63.3 24o. 5.1 73.7 825

18-20 100.0 100.0 100.0 100.0 99.9 95.4 69.7 30.1 4.5 75.9 712

CI 21-23 1 o, , 100. 0 1 Omo0,Oo 100 •0o 98.2 74.9 34o9 5•5 77,7 68

ITOTALS 1 100.0 100.0 100.0 100.0 99.4 95.3 72.3 34.0 6.4 76.7 5815

...................................... ............................................................................................

Lj

7*2

GLOBAL CLIMATOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUMIDITYL USAFEYAC FROM HOURLY OBSERVATIONS


STATION NUMBER: 035623 STATION NAME: RAF ALCO4BURY UNITEO IINGDOM PERIOD OF RECORD: 77-86MONTP: DEC

o MONTH| HOURS I PERCENTAGE FREQUENCY 0¥ RELATIVE HUMIDITY GREATER THAN I MEAN I TOTALI ILSTI I.................................................................. ... IRELA71VEI NUM I

I 10? 205 3? q.0 501 60S 7D% 80 9o IHUMIDITY| O I........................................................................................

DEC 00-02 1000 100.0 100.0 100.0 100.0 93.4 61.4 34.1 11.0 76.0 '7T

03-0S 100.0 100.0 100.0 100.0 100.0 95.0 71:9 40.3 14.2 77.9 72!

06-08 10.0 |0.0 100.0 100.0O 100.0 96.1 72.1 38.6 14.9 78,0 ale

09-11 100. 0 100.0 100.0 100.0 99.8 95.8 68.8 38.0 12.4 77.4 85C

12-14 I 100.0 100.0 100.0 100.0 99.4 90.2 64.5 32.' 8.2 75.2 901

151? 100.0 100.0 100.0 100.0 99.7 93.2 67.0 36.2 9.0 76.'4 903

18-20 .looO 100.0 100.0 100.0 100.0 96.2 66.7 38.6 10.8 77.2 757

21-23 1 100.0 100.0 100.0 100.0 100.0 96.9 68.0 37.7 13.2 77.5 735

O ITOTALS I 100.0 100.0 100.0 100.0 99.9 94.6 67.6 37.0 11.7 77.0 b161..............................se............................................................................................

0

GLOBAL CLIMAIOLOGY BRANCH CUMULATIVE PERCENTAGE FREQUENCY OF OCCURRENCE RELATIVE HUPIDITYUSAFETAC FROM HOURLY OBSERVATIONSAIR WEATHER SERVICEIMAC

STATION NUMBER: 035623 STATION NAME: RAF ALCOBURY UNITED KINGDOM PERIOD OF RECORD: 7T-87MONTH: ALL

MONTHI HOURS I - - PERCENTAGE FREQUENCY OF RELATIVE HUMIDITY GREATER THAN I MEAN I TOTALI

| ILSTI I, , , . .... ... .... ........ ............................ , , .•• ............. , ,IRELATIV[ [ NUP

I lot 202 30T 401 50 60% 702 SOX 80% 9 HUMIDITYI OBS I

JAN ALL 100.0 100.0 100.0 10000 99.9 95.0 74.1 42.8 12.6 78.5 6182

FEB I 100.0 100.0 100.0 99.9 99.2 94.9 77.7 45.9 15o0 79.1 5696

M AR 1 00.0 100.13 100.0 99.8 96.9 89.8 7o.0 41.4 12.7 76.9 6346

APR I 100.0 100.0 99.9 98.8 93.6 al.? 59.5 30.8 10.5 73.1 5269

RAY I00o 100.0 99.6 97.6 91.3 79.5 61.2 33.8 13.7 73.1 529k

JUN 100.0 100.0 100.0 99.4 94.2 79.3 62.S 30.4 9.5 73.1 558E

JUL 1 100.0 100.0 99.9 98.1 90.4 740B 59.9 31.1 10.6 72.2 6377

AUG 100.0 100.0 100.0 98.0 89.8 74.8 60.6 32.0 10.4 72.4 6501

SEP 100.0 100.0 99.9 99.3 90.6 80.5 65.4 33.1 10.2 76.0 6102

OCT ICO.O 100.0 10090 99.9 9B6 90.9 73.6 36.4 9.1 76.0 6076

NOV 100.0 100.0 100.0 100.0 99.4 95.3 72.3 34.0 6.4 76.7 s81l

o DEC 100.0 100.0 100.0 100.0 99.9 94.6 67.6 37.0 11.7 77.0 6161

ITOTALS 1 100.0 100.0 99.9 99.2 95.7 8s.9 67.0 35.7 11.0 75.2 71407

0

0

-i

pp0p AAA RARRR TYTTTFFFFF

Kp a R TTTTYYFFFFF0 pp AAAA RR

PPPPPPPP AALAAA RRRARRR TITTII FVFFFFFV

ppPPPP AAALAAA R R RRR TTIIT FFVVFF

pp PP P A A L AA R R TT FF

pp A L A RR RR YT FF

opp AA LA RR A R IT F!

PP L LA R ARII F

1

PRESSURE SUMMARIES

STATION PRSSURE SUMMARIES

I C DATA DERIVED FROM HOURLY OBSERVATIONS.

ct SUMMARIZED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH. MONTHLY AND ANNUALLY (ALL YEARS COMBINEDI.

PRESENTED ARE THE MEANS. STANDARD DEVIATIONS AND OBSERVATION COUNTS.

SEA LEVEL PRESSLRE SUMMARIESin

DATA DERIVED FROM HOURLY OBSERVATIONS.

OSUMMARIZED BY THE STANDARD 3-HOUR TIME GROUPS BY MONTH. MONTHLY AND ANNUALLY (ALL YEARS COMBINEDI.

PRESENTED ARE THE MEANS. STANDARD DEVIATIONS AND OBSERVATION COUNTS.'©

IC

C

0

0

0

0

C-

-1

2

GLOBAL CLIMATOLOGY BRANCH STATION PRESSURE IN INCHES H5 FROM MEANS AND STANDARD DEVIATIONSUSAFETAC HOURLY OBSERVATIONS

AIR WEATHER SERVICEMJHAC

0 STATION NUMBER: 035623 STATION NAME. RAF ALCO-48URY UNITED KINGOM PERIOD OF RECORD: 77-67

HOURSI STATS I JAN FEB MAR APR MAY JUN JUL NOR EEC ANN

LST I I......................................... ..I MEAN , 29.699 20;89 7 292977;9

00 1 SO I .394 .342 .10G .345 .233 .217 .19s .195 .278 *310 .372 .385 .321

O ITO OBSI 128 122 121 90 95 126 159 16 153 162 152 148 1623

IF MAN I 29.17.0 Z9 .B3B 29.6S3 29.752 29.73B 29.792 29.839 29.798 29.807 29.765 29.72'5 29.663 29. 759

03 I SO I .397 .360 .3B8 .329 .252 .213 .1 9 .209 .263 .31 .362 .4.38 ;3271101 QRS1 21. 227 259 213 215 230 259 263 253 261 zqz 21. 2915........ :;9:;;; . .. . .. .....

06 1 So I .110 ,3S6 *389 32 .2S7 .217 .205 .209 .261. .342 .351 .137 .328|OT OBSI 266 248 279 212 213 21.9 28 288 277 280 259 267 3182

I MEAN 1 29.7.5 29.849 29.66U 29.76 29.761 29.801 29.19a 29.815 29.825 29.775 29.762 29.662 29.77309 1 SO I .12 .355 .396 .325 .261 .217 .205 .210 .273 .398 .350 .128 .330

0 110T OBSI 279 257 265 213 Z1 250 283 290 279 279 263 276 3225

I MEAN 1 29.751 29.81.3 29.658 29.769 29.755 29.796 29,,64 29.B12 29.81B Z9.787 29.771 29.653 29.769Q 12 1 SD I .415 .360 ;394 .321 .258 .216 .201 .203 .26S .342 .319 .125 .328

1101 OBS1 302 280 311) 267 269 268 305 310 296 297 281 300 3488

o I MEAiN 29.739 29.819 29.613 2915 29.115 29.785 29.832 29.799 29.803 29.753 29.750 29.643 29.75415 I SO *.113 *358 .384 .317 .25S .211 .195 .196 .255 .336 .3.6 .122 .323

1101 0BS1 305 279 310 265 267 268 306 310 296 297 281 301 348s

......................................................................................................................................................I MEAN 1 29.73 29.840 29.6.5 29.7.8 29.753 29.783 29.823 29.786 29.807 29.780 29.797 29.65 29.757

18 I SD I .11S .351 .391 .32 .217 .2041 .187 .196 .252 .336 .352 .124 .32S

0 I 1TOBSI 270 219 27. 215 211 230 259 265 250 250 25 265 2995

.....................................................................................................................................................I MEAN 2 9.74 29.857 29.661 29.774 29.771. 29.798 29.846 29.809 29.832 29.792 29.751 29.66 29.775

o 21 I SO .1.07 .35 .395 .325 .246 .207 .186 .198 .257 .34.0 .366 .136 .326ITOT DBSI 299 228 258 212 212 230 257 263 242 2.1 229 215 2866

IAN 738 29.83 29.657 29.75 29.755 29.795 9.80 29.805 29.81 29.774 29.711 29.662 29.765ALL I SO .4109 .3S4 .392 .324 .253 .212 .197 .203 .262 .3141 .355 .127 .326

HOURSITOT 0851 2016 1890 2099 177 1756 1851 2112 21S3 201.6 2067 196 i0148 23779

2)

.. . . .. . . . .. . ... . .. . . . . .. . . . .. . .. .. .. . . . . . . . . . . . . . . . .. . . . .. . . .

Ammmmmmmm mimm -..

F AONBI JBYUNMT ED119BIZ UNCLASSIFIED - 199 731 r U ...7 ame Same Jan 67 Jul 72 Sune Same S ae 163...

Documents

Transcript of F AONBI JBYUNMT ED119BIZ UNCLASSIFIED - 199 731 r U ...7 ame Same Jan 67 Jul 72 Sune Same S ae 163...