024
FXSA20 KWBC 171327
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
926 AM EDT WED SEP 17 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 17). THE UPPER LEVEL ANALYSIS
CONTINUES TO SHOW A DISORGANIZED/LOW AMPLITUDE RIDGE PATTERN
ACROSS NORTHERN BRASIL/PERU...WITH A SHORT WAVE TROUGH NEARING
THE SOUTHERN COAST OF PERU. ALTHOUGH UPPER FLOW PATTERN IS ILL
ORGANIZED...THE TROPICAL CONVECTION ACROSS PARA-AMAZONAS IN
BRASIL CONTINUES TO FLARE UP...WITH ACTIVITY BUILDING IN CLUSTERS
OF ORGANIZED DEEP CONVECTION. THE CONVECTION WAS SPREADING INTO
THE NORTHERN JUNGLE OF PERU AND SOUTHERN AMAZONIA IN COLOMBIA.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
39S 120W...A 124KT MAXIMUM AT 41S 114W...EXITING AT 40S 100W. IT
REFORMS AT 41S 80W...ALONG PUNTA ARENAS CHILE...EXITING AT 60S
44W. THE NORTHERN POLAR LIES ALONG 33S 120W...33S 101W...35S
82W...46S 67W...EXITING AT 52S 52W. IT REFORMS BETWEEN 46S 52W
AND 33S 54W. THE NORTHERN POLAR REFORMS AGAIN AT 27S 48W...ALONG
30S 34W...A 152KT MAXIMUM AT 35S 20W...AND 36S 00W. THE
SUBTROPICAL JET LIES ALONG 19S 20W...21S 103W...EXITING AT 18S
86W. IT REFORMS OVER BOLIVIA NEAR 16S 63W...ALONG 18S 46W...25S
30W...29S 16W...EXITING AT 27S 03W.
AT MID LEVELS...A BROAD 500 HPA TROUGH DOMINATES THE FLOW OVER
THE SOUTHEAST PACIFIC...ENVELOPING AREA EAST OF 100W AND SOUTH OF
25S. NUMEROUS SHORT WAVE PERTURBATIONS ARE PUSHING EAST TOWARDS
THE SOUTHERN CONE-DRAKE PASSAGE...WITH A SOUTHERN STREAM TROUGH
ALONG 82W TO 53S. THIS IS PHASING WITH A NORTHERN STREAM TROUGH
OFF THE SOUTHERN/CENTRAL COAST OF CHILE...WITH THE LATTER
EXTENDING FROM TIERRA DEL FUEGO...ALONG 50S 80W...40S 80W...TO
32S 85W. A SKEWED RIDGE ORIGINATES OVER NORTHWEST ARGENTINA...
WITH AXIS EXTENDING ACROSS THE BUENOS AIRES PROVINCE...50S
50W...60S 50W...TO JUST EAST OF THE ANTARCTIC PENINSULA. ON THE
NORTHERN STREAM...OVER THE ATLANTIC...A CLOSED LOW NEAR 39S 31W
EXTENDS A TROUGH ALONG 30S 40W...TO SOUTHERN BRASIL/SOUTHEAST
PARAGUAY.
AT LOW LEVELS...A POLAR FRONT EXTENDS ALONG A 988 HPA LOW AT 60S
66W...TIERRA DEL FUEGO TO SOUTHERN PATAGONIA. AN OCCLUDED FRONT
LAGS THIS BOUNDARY...CENTERING ON A 1002 HPA LOW AT 49S 80W.
ANOTHER FRONT LIES TO THE EAST AND NORTH...EXTENDING ALONG A 1008
HPA LOW AT 55S 56W...LAS MALVINAS/FALKLAND ISLANDS...A 1002 HPA
LOW AT 50S 67W...NORTHERN PATAGONIA...TEMUCO CHILE...A 1018 HPA
LOW AT 38S 79W...JUAN FERNANDEZ ISLAND...AND 29S 90W. ON THE
NORTHERN STREAM...A RIDGE OVER THE EASTERN PACIFIC CENTERS ON A
1027 HPA HIGH AT 34S 95W. OVER THE ATLANTIC...ANOTHER RIDGE
CENTERS ON TWO HIGHS...A 1035 HPA AT 48S 38W AND A 1033 HPA AT
42S 50W. NORTH OF THIS RIDGE...A BROAD TROUGH EXTENDS OVER THE
CENTRAL TO WESTERN ATLANTIC...WITH AN OCCLUDED 1006 HPA LOW AT
37S 32W. AN ELONGATED FRONT LIES ALONG A 1018 HPA LOW AT 32S
19W...26S 26W...22S 34W...ESPIRITO SANTO/SOUTHERN MINAS GERAIS-
MATO GROSSO OD SUL TO BOLIVIA.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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