408
FXSA20 KWBC 251311
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
911 AM EDT THU SEP 25 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 25). THE SUBTROPICAL RIDGE
CONTINUES TO STRENGTHENS ACROSS NORTHERN SOUTH AMERICA...NOW
EXTENDING OVER AREA NORTH OF 14S WHILE ANCHORING ON A BUILDING
HIGH NEAR 08S 73W. A SECONDARY CELL OVER NORTHEAST BRASIL IS
SLOWLY MERGING INTO THE BROAD PATTERN AS THE LATTER INTENSIFIES.
TROPICAL CONVECTION IS FLARING UP OVER BRASIL TO THE NORTH OF 07S
AND WEST OF 47W...WHILE A DECREASE IN ACTIVITY WAS NOTED ACROSS
PERU AND ECUADOR.
THE MID LEVEL ANALYSIS SHOWS THE SOUTHERN POLAR JET WITH ENTRANCE
AT 36S 91W...THEN ALONG 52S 81W...EXITING AT 60S 61W. IT REFORMS
AT 63S 62W...ALONG 64S 37W...EXITING AT 56S 24W. THE NORTHERN
POLAR HAS ITS ENTRANCE AT 30S 108W...THEN ALONG 26S 95W...A 134KT
MAXIMUM AT 41S 82W...EXITING AT 48S 68W. IT REFORMS AT 33S
26W...ALONG 40S 13W...AND 39S 00W. THE SUBTROPICAL JET HAS ITS
ENTRANCE AT 19S 114W...THEN ALONG A 131KT MAXIMUM AT 23S
94W...25S 80W...ANTOFAGASTA...EXITING AT 16S 42W. IT REFORMS AT
19S 36W...ALONG 29S 24W...AND A 178KT MAXIMUM AT 35S 05W.
AT 500 HPA A LONG WAVE TROUGH EXTENDS NORTH ALONG 50S 85W...30S
95W...TO 20S 100W. TWO DISTINCT VORTICES ARE STARTING TO DEVELOP
ALONG THIS AXIS...WITH CLOSED CYCLONIC CIRCULATIONS FORMING NEAR
50S 85W AND 30S 96W. AS THE TROUGH MOVES EAST IT IS PUSHING
AGAINST A BLOCKING RIDGE THAT EXTENDS FROM JUST WEST OF NORTHERN
CHILE...ACROSS 40S 70W...PATAGONIA TO THE DRAKE PASSAGE. ON THE
SOUTHERN STREAM A SHORT WAVE TROUGH IS MOVING ALONG 50W AND SOUTH
OF 50S...WHILE ON THE NORTHERN STREAM ONE IS MOVING ACROSS
PATAGONIA TO THE BUENOS AIRES PROVINCE. A DEEPER NORTHERN STREAM
TROUGH LIES FARTHER EAST...CENTERING ON A LOW NEAR 37S 30W AND
ENVELOPING AREA BETWEEN 44W-20W AND SOUTH OF 20S.
AT LOW LEVELS...AN ELONGATED FRONT EXTENDS FROM A 978 HPA LOW AT
69S 60W...ACROSS THE NORTHERN TIP OF THE ANTARCTIC PENINSULA...
THE DRAKE PASSAGE...57S 72W...A 982 HPA TRIPLE POINT LOW AT 53S
85W...47S 79W...42S 80W...A 1014 HPA LOW AT 37S 85W...31S 88W...A
1018 HPA LOW AT 28S 92W...AND 23S 98W. A RIDGE OVER THE ATLANTIC
CENTERS ON TWO 1029 HPA HIGHS...WITH ONE NEAR 38S 44W AND THE
OTHER AT 46S 36W. AN OCCLUDED FRONT TO THE NORTH ORIGINATES ON A
1010 HPA LOW AT 36S 25W...THEN ALONG 37S 27W...A 1014 HPA LOW AT
37S 22W...33S 18W...A 1010 HPA LOW AT 27S 25W...20S 29W...16S
36W...ESPIRITO SANTO-MINAS GERAIS TO NORTHERN BOLIVIA. COASTAL
RAINFALL WAS REPORTED OVER ESPIRITO SANTO...WITH DEEP CONVECTION
FARTHER WEST ACROSS TOCANTINS TO PARA.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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