950
FXSA20 KWBC 141311
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
911 AM EDT THU AUG 14 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z AUG 14). THE 200 HPA ANALYSIS SHOWS THE
SUBTROPICAL RIDGE WITH AXIS DOMINATING AREA NORTH OF 20S. THE
RIDGE CENTERS ON TWO CLOSED HIGHS...WITH ONE NEAR 11S 90W AND THE
OTHER AT 09S 40W.IN THE LAST FEW DAYS TROPICAL CONVECTION HAS
SHIFTED WEST INTO COLOMBIA/NORTHERN PERU AND THE JUNGLE OF
ECUADOR...WITH WIDELY ISOLATED CONVECTION DOTTING THE NORTHERN
COAST OF BRASIL AND THE SIERRA OF PERU.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS AT 250 HPA
EXTENDING ALONG 64S 120W...A 144KT MAXIMUM AT 61S 102W...57S
87W...A 150KT MAXIMUM AT 58S 70W...EXITING AT 54S 45W. IT REFORMS
AT 46S 42W...ALONG 48S 21W...AND 53S 05W. THE NORTHERN POLAR LIES
ALONG 58S 120W...57S 110W...EXITING AT 52S 103W. IT REFORMS AT
44S 109W...ALONG 34S 96W...EXITING AT 36S 83W. THE NORTHERN POLAR
REFORMS AT 38S 68W...ALONG 39S 50W...A 141KT MAXIMUM AT 42S
31W...AND A 159KT MAXIMUM AT 45S 18W. THE SUBTROPICAL JET LIES
ALONG 26S 120W...29S 95W...29S 76W...EXITING AT 23S 56W. THE JET
REFORMS AT 25S 48W...ALONG 34S 37W...EXITING AT 37S 24W. DE LOS
250 HPA
AT 500 HPA...A RIDGE EXTENDS SOUTH BETWEEN 135W-115W...MEANWHILE
CENTERING ON A CLOSED HIGH NEAR 44S 124W. FARTHER EAST...ON THE
SOUTHERN STREAM FLOW...A BROAD TROUGH EXTENDS BETWEEN 110W-35W
AND SOUTH OF 50S. ON THE NORTHERN STREAM...A CLOSED LOW MEANDERS
NEAR 40S 96W...ANCHORING A LOW AMPLITUDE TROUGH BETWEEN 115W-85W
AND SOUTH OF 20S. EAST OF THIS AXIS...OVER THE WESTERN
ATLANTIC...AN ELONGATED TROUGH EXTENDS ALONG 57S 30W...50S
42W...40S 55W...TO NORTHERN PATAGONIA/LA PAMPA. ANOTHER EXTENDS
ALONG 40S 30W...30S 44W...TO SOUTHEAST BRASIL. NORTH OVER THE
CONTINENT...A RIDGE EXTENDS ACROSS CENTRAL BRASIL...WHERE IT
FAVOR A TRADE WIND SUBSIDENCE CAP.
THE SURFACE ANALYSIS SHOWS A BROAD RIDGE OVER THE PACIFIC WITH A
1035 HPA HIGH AT 46S 113W. EAST AND SOUTH OF THIS RIDGE...A BROAD
TROUGH ENVELOPS THE ANTARCTIC PENINSULA-BELLINGSHAUSEN/WEDDELL
SEA...WITH A DEEP 950 HPA LOW AT 66S 74W. AN ELONGATED FRONT
BOUNDS THE PERIPHERY OF THIS TROUGH AS IT EXTENDS ALONG A 946 HPA
LOW AT 65S 32W...57S 40W...54S 52W...A 982 HPA LOW AT 55S 59W...
52S 66W...SOUTHERN PATAGONIA...A 986 HPA LOW AT 55S 73W...51S
88W...AND 55S 110W. AN ELONGATED FRONT TO THE NORTH LIES ALONG A
1002 HPA LOW AT 48S 36W...43S 40W...42S 45W...A 1016 HPA LOW AT
43S 48W...36S 56W...CENTRAL ARGENTINA...A 1014 HPA LOW AT 39S
75W...31S 79W...25S 91W. AN OCCLUDED 1002 HPA LOW CENTERS NEAR
40S 86W. ANOTHER ELONGATED FRONT LIES ALONG 44S 24W...A 1022 HPA
LOW AT 35S 36W...29S 41W...A 1022 HPA LOW AT 28S 46W...SAO PAULO-
MATO GROSSO DO SUL TO PARAGUAY. SCATTED CONVECTION WAS NOTED OVER
SOUTHERN BRASIL. A MODIFYING POLAR RIDGE TO THE SOUTH CENTERS ON
A 1025 HPA HIGH AT 35S 45W...WHILE A BROAD RIDGE TO THE AST
CENTERS ON A 1039 HPA HIGH AT 33S 14W.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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