March, 16 - 2014 - INPEchuvaproject.cptec.inpe.br/.../pdf/boletim/20140316... · 16/03/2014 ·...
Transcript of March, 16 - 2014 - INPEchuvaproject.cptec.inpe.br/.../pdf/boletim/20140316... · 16/03/2014 ·...
March, 16 - 2014
Summary
1. General weather condition ................................................................................................... 2
2. Synoptic Scale ........................................................................................................................ 2
3. Radar images ......................................................................................................................... 7
4. Other instruments ................................................................................................................. 8
1. General weather condition
In March 16 the maximum and minimum temperatures observed in Manacapuru were 31.6°C
and 24.2°C, respectively, registered by INMET weather station. The temperatures, in Manaus,
ranged between 25.2°C and 31.8°C. Through the analysis of synoptic conditions for March 16,
Atlantic Subtropical High centered over eastern 30°W was found. An Extratropical Cyclone acts
in Argentine, centered around 44°S/60°W. The ITCZ main branch over Atlantic Ocean acts
betweens 01°N/02°N. It’s possible to observe winds blowing from east/northeast at 850 hPa
level and, at high levels it’s observed the cyclonic circulation over Manaus region. CAPE
decreased from 889 J/Kg to 548 J/Kg around 0000 and 1200 UTC. CINE values increased from
19 to 50 between 0000 and 1200 UTC. S-band and X-band radar images show some local
convective rain cells, moving from northeast over Manacapuru-T3 site were observed, with
reflectivity (rain rate) values greater than 30 dBZ (~5 mm/hr). In general, no significant
precipitation systems were observed a long of the day over Manaus region. The satellite
images show clear sky conditions associated with subsidence over Manaus region. This
subsidence is resultant of the cyclonic circulation over the region.
2. Synoptic Scale
Figure 2.1 shows synoptic conditions for March 16 at a) surface, b) 850 hPa and c) 250 hPa
levels at 1800 UTC. Atlantic Subtropical High centered on eastern 30°W. In Figure 2.1a a
stationary front over the Atlantic Ocean southeastern of the 39°S/40°W was observed. One
extratropical cyclone acts over Argentine centered around 44°S/60°W. The ITCZ main branch
over Atlantic Ocean acts betweens 01°N/02°N. It’s possible to observe winds blowing from
east/northeast at the 850 hPa level and, at high levels a cyclonic circulation over Manaus
region was observed.
a)
b)
c)
Figure 2.1: Synoptic conditions for March 16 on a) surface, b) 850 hPa and c) 250 hPa levels.
Source: CPTEC/INPE.
Figure 2.2 shows satellite images (from IR channel), at (a) 1200 and (b) 1800 UTC valid for
March 16. It was observed a clear sky conditions associated with subsidence over Manaus
region. This subsidence is resultant of cyclonic circulation over the region.
a)
b)
Figure 2.2 – Channel 4-IR GOES-13 images for (a) 1200 and (b) 1800 UTC valid for March 16.
Source: DSA/INPE.
Figure 2.3 shows thermodynamic profiles (by Skew-T diagram) for Ponta Pelada site at (a) 0000
and (b) 1200 UTC (March 16). CAPE decreased from 889 J/Kg to 548 J/Kg around 0000 and
1200 UTC. CINE values increased from 19 to 50 between 0000 and 1200 UTC.
a)
b)
Figure 2.3: Thermodynamic profiles for Ponta Pelada site at a) 0000 and b) 1200 UTC. Source:
Master/IAG/USP.
3. Radar images
Figure 3.1 shows S-band and X-band radar images (CAPPI-2km) from SIPAM and CHUVA
Project, located at Manaus and Manacapuru cities, for March 16 at a) 2000, b) 2100 UTC, c)
1950 and d) 2000 UTC, respectively. Some local convective rain cells, moving from northeast
over Manacapuru-T3 site were observed, with reflectivity (rain rate) values greater than 30
dBZ (~5 mm/hr). In general, no significant precipitation systems were observed a long of the
day over Manaus region.
a) b)
c) d)
Figure 3.1 – SIPAM (S-band) and CHUVA (X-band) radars reflectivity (dBZ)/rain rate (mm/hr)
from CAPPI-2km product, for March 16 at a) 2000, b) 2100 UTC, c) 1950 and d) 2000 UTC.
4. Other instruments
Figure 4.1, shows the Micro Rain Radar (MRR) radar reflectivity and Liquid Water Content
(LWC) time series from 0000 UTC to 2400 UTC. No precipitation were observed during the
referenced period at Manacapuru site.
a)
d)
Figure 4.1 - MRR measurements of Average of the Radar reflectivity (a) and Liquid Water
Content (b) for March 16, from 0000 to 2400 UTC, measured at Manacapuru.