087
FXSA20 KWBC 071305
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
905 AM EDT THU AUG 07 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z AUG 07). TROPICAL CONVECTION ACROSS
AMAZONAS-PARA IN CENTRAL/WESTERN BRASIL IS UNUSUALLY ACTIVE FOR
THIS TIME OF THE YEAR. AT 200 HPA...THE SUBTROPICAL RIDGE IS
PROVIDING VENTILATION TO THE DEEP CONVECTION AS IT EXTENDS NORTH
OF 20S AND WEST OF 50W...CENTERING ON A CLOSED HIGH NEAR 08S 56W.
THE RIDGE ALOFT IS PROVIDING THE STEERING FLOW TO CONVECTION AS
IT SPREADS ACROSS THE PERUVIAN JUNGLE TO NORTHERN BOLIVIA.
FURTHERMORE...A SHORT WAVE TROUGH EXTENDS ALONG 30S 80W TO 10S
90W. THIS TROUGH IS PUSHING EAST AGAINST THE UPPER RIDGE.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
69S 98W...63S 88W...EXITING AT 57S 78W. IT REFORMS NEAR 39S
102W...ALONG 44S 89W...40S 77W...LA PAMPA...A 153KT MAXIMUM AT
42S 51W...44S 27W...40S 13W...AND 47S 01W. THE NORTHERN POLAR HAS
ITS ENTRANCE AT 30S 120W...ALONG 36S 97W...37S 87W...EXITING AT
32S 76W. IT REFORMS AT 31S 69W...ALONG 30S 60W...EXITING AT 31S
52W. IT REFORMS AGAIN AT 29S 45W...ALONG 33S 26W...35S 16W...AND
36S 03W. THE SUBTROPICAL JET LIES ALONG 23S 120W...A 148KT
MAXIMUM AT 28S 107W...26S 95W...EXITING AT 15S 86W. IT REFORMS AT
15S 79W...ALONG 23S 64W...EXITING AT 20S 46W.
AT MID LEVELS...ON THE NORTHERN STREAM FLOW...A SHORT WAVE TROUGH
BOUNDS BETWEEN 125W-97W AND SOUTH OF 25S...CENTERING ON A CLOSED
LOW NEAR 40S 110W. THERE IS AN INDUCED RIDGE ALONG 90W. FARTHER
EAST...A SOUTHERN STREAM TROUGH IS SURGING NORTH ALONG 80W TO
48S. THIS TROUGH IS FOCUSING ITS SHORT WAVE ENERGY ACROSS THE
BELLINGSHAUSEN SEA AND THE ANTARCTIC PENINSULA. THIS VORTEX IS
STARTING TO INTERACT WITH A LOW AMPLITUDE TROUGH TO THE NORTH...
WITH THE LATTER EXTENDING BETWEEN 80W 45W AND SOUTH OF 30S. THE
TROUGH IS FOCUSING ITS SHORT WAVE ENERGY ACROSS SOUTHERN CHILE-
PATAGONIA IN ARGENTINA...WITH A STRONG SHORT WAVE TROUGH
EXTENDING ALONG 50S 48W...43S 50W...TO LA PAMPA IN ARGENTINA.
A RIDGE ON THE SOUTHERN STREAM...OVER THE EASTERN
PACIFIC...CENTERS ON A 1035 HPA HIGH AT 51S 117W. EAST AND
SOUTHEAST FROM THIS RIDGE...AN OCCLUDED 978 HPA LOW AT 69S 70W
EXTENDS A FRONT ALONG 62S 69W...A 994 HPA LOW AT 57S 74W...57S
80W...AND 65S 95W. AS IT BARRELS TOWARDS THE SOUTHERN CONE...THIS
SYSTEM FAVORS DENSE CLOUD COVER OVER TIERRA DEL FUEGO. ON THE
NORTHERN STREAM...AN OCCLUDED 1002 HPA LOW AT 40S 108W EXTENDS A
FRONT ALONG 43S 106W...A 1012 HPA LOW AT 40S 97W...34S 103W...A
1018 HPA LOW AT 28S 113W. A RIDGE OFF THE COAST OF CHILE CENTERS
ON TWO HIGHS...A 1027 HPA AT 32S 85W AND A 1025 HPA AT 36S 75W. A
BROAD TROUGH OVER THE SOUTHERN CONE/WESTERN ATLANTIC CENTERS ON
TWO OCCLUDED LOWS...A 984 HPA AT 52S 62W AND A 982 HPA LOW AT 52S
45W. A FRONT EXTENDS FROM THE LATTER ALONG A 990 HPA TRIPLE
POINT LOW AT 50S 32W...46S 34W...A 998 HPA LOW AT 44S 41W...38S
50W...NORTHERN BUENOS AIRES TO CENTRAL ARGENTINA. A SECONDARY
FRONT IS ALSO ANALYZED...EXTENDING FROM AN OCCLUDED 994 HPA LOW
AT 50S 68W...ALONG A 998 HPA LOW AT 44S 63W...TO LA PAMPA IN
ARGENTINA. OTHER FRONTS LIE TO THE NORTH AND EAST...WITH ONE
ALONG 32S 23W...29S 37W...TO RIO GRANDE DO SUL BRASIL. ANOTHER
LIES ALONG A 1024 HPA LOW AT 30S 20W...25S 28W...24S 38W...SAO
PAULO-NORTHERN MESOPOTAMIA-SOUTHERN PARAGUAY-TO CENTRAL BOLIVIA.
ISOLATED CONVECTION WAS BUILDING NORTH OF THIS BOUNDARY.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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