Valencia sailing conditions: April 2007
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Transcript of Valencia sailing conditions: April 2007
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Valencia sailing conditions:
April 2007
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The facts
The big questionIs Valencia a bad venue, or is April 2007 just an extremely bad month?
This is the data we use for wind analysis– Most accurate data available– MDS weather buoys 2005-2007– Puertos weather station 2000-2004– Puertos station calibrated to buoys– Data used from 15:00-17:00– Wind limits 7-23 knots
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1.1) STATIONS LOCATION : PORTPuertos station
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Valencia: percentage of sailing days
Year April May June
2000 93% No data 96%
2001 87% 87% 83%
2002 93% No Data 88%
2003 88% 74% 81%
2004 81% 88% 89%
2005 93% 94% 93%
2006 90% 87% 90%
2007 50%
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Auckland: percentage of sailing days
Analysis conducted by CSIRO Criteria: 12:00-15:00 7 – 23 knots
AXYS Buoy Jan. 2001 – Mar. 2003 35 – 50% sailing days in summer months in
Auckland
Endeco Buoy Jan. 1997 – Mar. 2000 35 – 55% sailing days in summer months in
Auckland
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Valencia:consecutive non-sailing
daysYear April May June
2000 1 No data 1
2001 3 2 4
2002 1 No data 2
2003 2 3 2
2004 3 2 1
2005 1 2 1
2006 2 2 1
2007 7
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April 2007
WS avg from 3 to 5pm on the NC (April 2007)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Day (1 to 23 of april)
TWS
(kn)
Race
Almost 11 consecutive days !
LVC Start
Race Race
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Summary
April 2007 was an extremely bad month with almost half the number of sailing days than usual
Analysis has been done with the best available data and would stand up to independent scrutiny
Suitability of Valencia as a sailing venue should not be judged on one extremely rare meteorological event
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What makes wind in Valencia?
Gradient Vs Sea breeze Need favorable gradient wind for sea breeze
– Southerly gradient gives the strongest sea breeze
– North-easterly gradient gives weakest sea breeze
Thermal effect, especially over the mountains– Warm over land, cool over sea
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Atmospheric ‘block’
Occurs mainly over Europe in the winter and spring
Stable pattern – hard to break Position can change
– It makes a significant difference to the weather
Very hard to predict when the ‘blocks’ form and when they will disappear!
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2007 2006
H
L
L
L
Surface pressure different from normal
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Temperatures different from normal (15-21 April)
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Valencia/Manises, Spain
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Any Questions?