781
FXSA20 KWBC 051335
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
934 AM EDT TUE AUG 05 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
COR DTG
SYNOPSIS (VALID FROM 00Z AUG 05). A 200 HPA RIDGE IS INITIALIZED
OVER NORTHERN SOUTH AMERICA...WITH AXIS ENVELOPING AREA NORTH OF
10S. THIS RIDGE CENTERS ON AN ILL ORGANIZED HIGH NEAR 04S 53W.
THIS IS PROVIDING VENTILATION ALOFT TO DEEP CONVECTION ACROSS
PARA-AMAZONAS-RONDONIA IN WESTERN BRASIL...AMAZONIA IN SOUTHERN
COLOMBIA AND THE NORTHERN JUNGLE OF PERU.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET WITH AXIS
ALONG 65S 109W...52S 103W...A 160KT MAXIMUM AT 48S 94W...47S
80W...48S 70W...TO 44S 64W. IT HAS A FINGER BETWEEN 41S 56W
AND42S 36W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 43S 104W...
ALONG 43S 97W...40S 86W...EXITING AT 36S 75W. IT REFORMS AT 32S
72W...ACROSS A 137KT MAXIMUM AT 32S 58W...36S 44W...A 131KT
MAXIMUM AT 34S 32W...37S 20W...AND 45S 09W. THE SUBTROPICAL JET
HAS ITS ENTRANCE AT 16S 86W...ALONG 19S 74W...EXITING AT 17S 63W.
IT REFORMS AT 26S 41W...ALONG 30S 32W...30S 24W...EXITING AT 36S
12W.
THE MID LEVEL ANALYSIS SHOWS A TROUGH ON THE SOUTHERN STREAM
FLOW...WITH AXIS AT 500 HPA EXTENDING BETWEEN 110W-65W AND SOUTH
OF 40S. TWO CLOSED LOWS EMBED IN THIS AXIS...WITH ONE NEAR 71S
89W AND THE OTHER AT 56S 87W. THE NORTHERNMOST IS FOCUSING ITS
SHORT WAVE ENERGY OVER EXTREME SOUTHERN CHILE/TIERRA DEL FUEGO.
FARTHER EAST...A SHORT WAVE RIDGE ON THE SOUTHERN STREAM FLOW
EXTENDS BETWEEN 60W-20W AND SOUTH OF 55S...WITH A CLOSED HIGH
NEAR 63S 40W. ON THE NORTHERN STREAM...MEANWHILE...A RIDGE
EXTENDS FROM A HIGH AT 26S 93W TO 43S 114W. FARTHER EAST...A
TROUGH EXTENDS ALONG 40S 60W TO JUST NORTH OF LA SERENA CHILE.
OVER THE ATLANTIC...A BROAD/LOW AMPLITUDE TROUGH EXTENDS BETWEEN
45W-15W AND SOUTH OF 30S...WITH ILL ORGANIZED LOW NEAR 47S 40W.
AT LOW LEVELS...THE ANALYSIS SHOWS A TROUGH OVER THE FAR EASTERN
PACIFIC WITH AN OCCLUDED 964 HPA LOW AT 57S 84W...WITH A FRONT
ALONG A 972 HPA LOW AT 54S 78W...A 982 HPA LOW AT 50S 76W...45S
78W...A 1004 HPA LOW AT 44S 82W...41S 88W...AND 41S 97W. THIS
SYSTEM FAVORS DENSE CLOUD COVER OVER THE SOUTHERN ANDES AND DENSE
CLOUD COVER. A RIDGE TO THE NORTH CENTERS ON A 1029 HPA HIGH AT
32S 91W AND A 1025 HPA HIGH AT 37S 74W. EAST OVER THE
ATLANTIC...A WANING POLAR FRONT EXTENDS FROM A 1002 HPA LOW AT
45S 62W TO LA PAMPA/CENTRAL ARGENTINA. ANOTHER FRONT LIES ALONG A
1002 HPA LOW AT 41S 40W...36S 39W...35S 45W...A 1006 HPA LOW AT
39S 50W...URUGUAY-CORDOBA TO NORTHWEST ARGENTINA. THIS FAVORS
ISOLATED CONVECTION OVER RIO DE LA PLATA BASIN. A 1017 HPA POLAR
HIGH CENTERS NEAR 33S 64W. AN ELONGATED FRONT LIES ALONG A 998
HPA LOW AT 42S 17W...32S 18W...27S 25W...23S 36W...NR SAO PAULO-
MATO GROSSO DO SUL-CHACO PARAGUAYO TO THE BOLIVIAN JUNGLE. A 1002
HPA THERMAL LOW CENTERS OVER JUJUY/SALTA IN NORTHWEST
ARGENTINA...WHILE A 1021 HPA HIGH AT 25S 39W SUPPORTS A RIDGE ON
THE NORTHERN STREAM FLOW.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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