512
FXSA20 KWBC 101322
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
922 AM EDT FRI OCT 10 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z OCT 10). UPPER LEVEL EVOLUTION SHOWS THE
SUBTROPICAL RIDGE WITH AXIS AT 200 HPA NOW CONFINING TO EXTREME
NORTHERN PORTIONS OF SOUTH AMERICA...ORIGINATING ON A HIGH NEAR
09S 52W AND EXTENDING WEST ALONG 09S TO THE EASTERN TROPICAL
PACIFIC. AN ILL ORGANIZED LOW FORMED NEAR 06S 44W. TROPICAL
CONVECTION CONFINES TO CONTINENTAL AREA NORTH OF 10S AND WEST OF
50W. A SHORT WAVE TROUGH IS SLIDING UNDER THE RIDGE...EXTENDING
ACROSS CUYO IN ARGENTINA TO WESTERN BOLIVIA/SOUTHERN PERU. THIS
FAVORS ISOLATED TO SCATTERED CONVECTION OVER NORTHWEST ARGENTINA
BETWEEN MENDOZA AND SALTA.
THE UPPER LEVEL ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS AT
250 HPA ALONG 61S 120W...59S 98W...EXITING AT 65S 82W. IT REFORMS
FARTHER NORTH NEAR 48S 84W...THEN ALONG 56S 73W...EXITING AT 64S
58W. THE NORTHERN POLAR LIES ALONG 31S 120W...A 148KT MAXIMUM AT
34S 93W...EXITING AT 36S 73W. IT REFORMS AT 31S 30W...ALONG A
128KT MAXIMUM AT 34S 21W...42S 10W...AND A 177KT MAXIMUM AT 45S
05E. THE SUBTROPICAL JET LIES ALONG 26S 120W...29S 99W...31S
80W...EXITING NEAR 22S 69W. IT REFORMS AT 24S 42W...ALONG 26S
28W...31S 16W...EXITING AT 36S 03W.
AT 500 HPA A DEEP LOW CENTERS NEAR 68S 112W...ANCHORING A TROUGH
OVER THE EASTERN PACIFIC. AXIS EXTENDS ALONG 70S 80W...65S
75W...57S 80W...A LOW NEAR 50S 90W...36S 95W...TO 34S 110W. A
SECONDARY VORTEX TRAILS...CENTERING NEAR 52S 110W. A SHORT WAVE
TROUGH IS MOVING ACROSS PATAGONIA IN ARGENTINA...WHILE ANOTHER IS
PUSHING ACROSS NORTHERN CHILE. A BLOCKING RIDGE EXTENDS SOUTH
ALONG 50W-60W TO THE ANTARCTIC PENINSULA. FARTHER EAST...A BROAD
TROUGH BOUNDS BETWEEN 40W-15W AND SOUTH OF 20S.
AT LOW LEVELS AN OCCLUDED 938 HPA LOW AT 69S 96W EXTENDS A FRONT
ALONG 61S 85W...55S 93W...A 990 HPA LOW AT 52S 100W...45S
101W...AND 42S 111W. ANOTHER FRONT EXTENDS ALONG A 982 HPA LOW AT
67S 60W...61S 56W...57S 71W...A 1002 HPA LOW AT 53S 76W...47S
79W...A 1010 HPA LOW AT 41S 84W...35S 88W...AND 29S 100W. A 1021
HPA HIGH AT 28S 87W EXTENDS A RIDGE SOUTHEAST TO SOUTHERN
CHILE/WESTERN PATAGONIA. A WANING FRONT OVER PATAGONIA EXTENDS
FROM A 1010 HPA LOW AT 43S 63W TO LA PAMPA IN ARGENTINA. A 1006
HPA LOW NEAR 33S 67W ANCHORS A THERMAL TROUGH OVER CUYO IN
ARGENTINA...WITH DEEP CONVECTION NORTH OF THIS AXIS ON THE
NORTHWEST PROVINCES OF ARGENTINA. A BROAD RIDGE OVER THE WESTERN
ATLANTIC CENTERS ON A 1033 HPA HIGH AT 35S 44W. A WANING FRONT TO
THE EAST AND NORTH LIES ALONG A 1014 HPA LOW AT 34S 18W...26S
26W...22S 36W...TO SAO PAULO BRASIL. ANOTHER FRONT LIES ALONG
1010 HPA LOW AT 36S 12W...26S 20W...20S 32W...ESPIRITO SANTO-TO
NORTHERN SAO PAULO. SCATTERED CONVECTION WAS NOTED OVER RIO DE
JANEIRO-ESPIRITO SANTO TO NORTHERN SAO PAULO/SOUTHERN MINAS
GERAIS.
URRA...DMC (CHILE)
MOREYRA...SENAMHI PERU
DAVISON...HPC (USA)
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