292
FXSA20 KWBC 081312
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
912 AM EDT MON SEP 08 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 08). THE UPPER LEVEL ANALYSIS ACROSS
NORTHERN SOUTH AMERICA SHOWS A DISORGANIZED FLOW PATTERN...WITH
SEVERAL SHORT WAVE PERTURBATIONS STREAMING ACROSS SOUTHERN PERU-
BOLIVIA-SOUTHEAST BRASIL. TROPICAL CONVECTION REMAINS UNUSUALLY
ACTIVE TO THE NORTH OF 07S AND WEST OF 48W...WITH MOST INTENSE
BUILDING ACROSS PARA. OTHER CONVECTION CONCENTRATED ON THE
CENTRAL/NORTHERN JUNGLE OF PERU.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE
AT 43S 83W...ALONG 43S 71W...EXITING AT 44S 60W. IT REFORMS AT
52S 35W...ALONG 46S 20W...EXITING AT 39S 07W. THE NORTHERN POLAR
HAS ITS ENTRANCE AT 36S 102W...ALONG 37S 92W...EXITING AT 37S
81W. IT REFORMS AT 45S 36W...THEN ALONG A 139KT MAXIMUM AT 42S
21W...AND 35S 11W. THE SUBTROPICAL JET LIES ALONG 29S 120W...A
141KT MAXIMUM AT 30S 105W...30S 79W...28S 65W...30S 44W...36S
29W...A 157KT MAXIMUM AT 33S 14W...AND 30S 00W.
AT MID LEVELS...A 500 HPA TROUGH EXTENDS ALONG 67S 90W...58S
85W...50S 95W...A CYCLONIC MAXIMUM AT 44S 97W...38S 105W...TO 34S
110W. A SECONDARY VORTEX IS MOVING ACROSS CENTRAL PATAGONIA. ON
THE NORTHERN STREAM...A LOW NEAR 37S 44W EXTENDS A SHORT WAVE
TROUGH TO SOUTHERN BRASIL. A CYCLONIC MAXIMUM OVER MENDOZA
ARGENTINA TRAILS THIS VORTEX. FARTHER NORTH...A RIDGE EXTENDS
WEST ACROSS THE ATLANTIC TO CENTRAL BRASIL...WHERE IT SUSTAINS A
TRADE WIND INVERSION.
AT LOW LEVELS...AN ELONGATED FRONT LIES ALONG A 974 HPA LOW AT
66S 86W...65S 81W...58S 73W...A 1002 HPA LOW AT 53S 75W...TO 43S
78W. A SECONDARY FRONT FOLLOWS...ORIGINATING ON A 1002 HPA LOW AT
46S 94W...44S 91W...37S 95W...AND 35S 109W. FARTHER EAST...AN
OCCLUDED 1010 HPA LOW AT 46S 65W EXTENDS A FRONT ALONG A 1006 HPA
LOW AT 49S 60W...NORTHERN PATAGONIA/LA PAMPA...CURICO CHILE...32S
80W...AND 29S 99W. AN OCCLUDED 1002 HPA LOW AT 35S 43W EXTENDS A
FRONT ALONG A 1014 HPA LOW AT 34S 36W...25S 39W....SOUTHERN RIO
DE JANEIRO-GOIAS-MATO GROSSO TO NORTHERN BOLIVIA/RONDONIA. LIGHT
COASTAL CONVECTION WAS REPORTED ACROSS SAO PAULO BRASIL. A 1025
HPA POLAR HIGH CENTERS NEAR 28S 52W.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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