733
FXSA20 KWBC 101322
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
922 AM EDT WED SEP 10 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 10). THE 200 HPA ANALYSIS SHOWS TWO
NORTHERN HEMISPHERE LOWS/CYCLONES NEAR AMAPA IN NORTHERN BRASIL
AND 01N 39W. THESE ARE IN PHASE WITH A LOW AMPLITUDE SOUTHERN
HEMISPHERE RIDGE ACROSS BRASIL/PERU. AS EVIDENT ON THE SATELLITE
IMAGERY...TROPICAL CONVECTION OVER PARA/AMAZONAS IN BRASIL
REMAINS UNUSUALLY ACTIVE...WITH ACTIVITY BUILDING IN CLUSTERS.
ISOLATED CONVECTION IS BUILDING ON THE SIERRA OF PERU.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
A 136KT MAXIMUM AT 49S 120W...52S 107W...EXITING AT 56S 92W. IT
REFORMS BETWEEN 55S 75W AND 68S 64W. THE NORTHERN POLAR LIES
ALONG 34S 120W...37S 110W...EXITING AT 34S 100W. IT REFORMS NEAR
32S 92W...THEN ALONG 32S 84W...36S 65W...32S 36W...A 125KT
MAXIMUM AT 35S 21W...AND 35S 00W. THE SUBTROPICAL JET LIES ALONG
25S 120W...A 122KT MAXIMUM AT 27S 110W...28S 84W...A 140KT
MAXIMUM AT 29S 70W...EXITING AT 27S 42W. THE SUBTROPICAL JET HAS
A FINGER WITH ENTRANCE AT 27S 36W AND EXIT NEAR 30S 21W. IT
REFORMS AT 29S 18W...CROSSING 29S 07W...AND 29S 00W.
AT 500 HPA...A TROUGH IS AMPLIFYING ALONG 120W/130W...WHICH IN-
TURN FAVORS THE SOUTHWARD AMPLIFICATION OF A RIDGE ALONG 90W.
DOWNSTREAM FROM THIS AXIS...A NEGATIVELY TILTED TROUGH LIES ALONG
70S 90W...60S 74W...THEN NORTH ALONG 80W TO 40S. ON THE NORTHERN
STREAM...MEANWHILE...A SHORT WAVE TROUGH IS MOVING INTO CENTRAL
CHILE BETWEEN TEMUCO/CONCEPCION...WHILE ANOTHER EJECTED ACROSS LA
PAMPA/NORTHERN PATAGONIA TO THE WESTERN ATLANTIC. FARTHER EAST...
A BROAD/LOW AMPLITUDE TROUGH EXTENDS BETWEEN 40W-15W AND SOUTH OF
25S. FARTHER NORTH...A RIDGE EXTENDS WEST ACROSS BRASIL TO
BOLIVIA...WITH A SUBSIDENCE CAP OVER THE CONTINENT DOMINATING
BETWEEN 10S-25S.
THE SURFACE ANALYSIS SHOWS AN ELONGATED FRONT THAT EXTENDS ALONG
A 980 HPA LOW AT 66S 72W...59S 67W...56S 69W...A 1006 HPA LOW AT
50S 62W...45S 76W...42S 81W...40S 90W...TO A 1018 HPA LOW AT 43S
96W. EAST AND NORTH OF THIS SYSTEM...ANOTHER FRONT EXTENDS ALONG
A 1002 HPA LOW AT 52S 67W...49S 62W...A 1014 HPA LOW AT 42S
64W...LA PAMPA...TEMUCO CHILE...A 1018 HPA LOW AT 36S 76W...32S
78W...WEAKENING NEAR 29S 82W. A BROAD RIDGE TO THE WEST CENTERS
ON A 1025 HPA HIGH AT 32S 97W. OVER THE ATLANTIC...MEANWHILE... A
FRONT LIES ALONG A 1010 HPA LOW AT 55S 29W...48S 29W...46S
34W...A 1018 HPA LOW AT 45S 52W...BUENOS AIRES PROVINCE TO
CENTRAL ARGENTINA. A RIDGE OFF THE COAST OF SOUTHERN BRASIL-
URUGUAY CENTERS ON A 1029 HPA HIGH AT 37S 44W. THERE IS ALSO AN
OCCLUDED TROUGH TO THE EAST...WITH A 1006 HPA LOW AT 40S 23W. A
FRONT LIES ALONG A 1010 HPA LOW AT 41S 16W...A 1016 HPA TRIPLE
POINT LOW AT 37S 14W...32S 19W...29S 23W...A 1022 HPA LOW AT 28S
28W...24S 33W...23S 38W...SAO PAULO...A 1014 HPA LOW AT 28S
55W...TO CHACO PARAGUAYO. STRATIFORM CLOUD COVER AND LIGHT
RAINFALL WAS REPORTED OVER SOUTHERN BRASIL.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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