731
FXSA20 KWBC 301314
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
914 AM EDT TUE SEP 30 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 30). AT 200 HPA...THE UPPER ANALYSIS
SHOWS A STRONG SUBTROPICAL RIDGE DOMINATING THE PATTERN OVER
SOUTH AMERICA NORTH OF 20S. THE SUBTROPICAL HIGH IS CENTERED OVER
CENTRAL PERU WITH A RIDGE EXTENDING EAST ACROSS CENTRAL BRASIL
ALONG 10S INTO THE SOUTH ATLANTIC. A RIDGE ALSO EXTENDS WEST
FROM THE HIGH ALONG 10S INTO THE PACIFIC OCEAN. SATELLITE IMAGERY
SHOWS SCATTERED CONVECTION BUILDING OVER BRASIL MAINLY ALONG 10S
AND OVER EXTREME WESTERN BRASIL INTO CENTRAL AND NORTHERN PERU.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET EXTENDS ALONG 48S
120W TO A 128 KT WIND MAXIMA AT 52S 100W TO 59S 78W TO A 124 KT
WIND MAXIMA AT 63S 61W TO 67S 34W TO AN EXIT AT 51S 22W. THE
NORTH POLAR JET EXTENDS ALONG 35S 93W TO 29S 86W TO AN EXIT AT
41S 77W. IT REFORMS AT 49S 72W AND EXTENDS ALONG 60S 43W TO AN
EXIT AT 47S 31W. THE JET THEN CONTINUES ALONG 42S 27W TO 37S 10W
TO 38S 00W. THE SUBTROPICAL JET EXTENDS ALONG 16S 114W TO A 127
KT WIND MAXIMA AT 22S 88W TO 27S 74W TO AN EXIT AT 29S 59W.
ANOTHER SUBTROPICAL JET EXTENDS ALONG 32S 41W TO 21S 36W TO AN
EXIT AT 22S 29W.
AT 500 HPA...ANALYSIS SHOWS A TROUGH EXTENDING NORTHWEST FROM A
CLOSED LOW NEAR 69S 94W TO 53S 115W TO 47S 132S. A NORTHERN
STREAM CLOSED LOW WAS CENTERED AT 39S 85W. OVER THE SOUTHERN
CONE... A RIDGE EXTENDS FROM NORTHWEST ARGENTINA SOUTH ALONG 66W
TO PATAGONIA. DOWNSTREAM FROM THE RIDGE A SHORTWAVE TROUGH
EXTENDS ALONG 56W/57W FROM EXTREME SOUTHERN PARAGUAY ACROSS
URUGUAY INTO THE SOUTH ATLANTIC NEAR 43S 58W. OVER THE SOUTH
ATLANTIC A NORTHERN STREAM CLOSED LOW IS CENTERED NEAR 27S 34W.
AT LOW LEVELS...THE ANALYSIS SHOWS A 1006 HPA LOW AT 53S 64W WITH
A COLD FRONT EXTENDING FROM THE LOW TO 51S 67W THEN AS A WARM
FRONT ALONG 48S 78W TO A 1010 HPA LOW AT 42S 84W. A COLD FRONT
EXTENDS FROM THIS LOW ALONG 33S 81W TO 24S 88W. A 1014 HPA LOW
IS LOCATED AT 54S 60W WITH A COLD FRONT EXTENDING TO 50S 62W TO A
1014 HPA LOW AT 44S 68W TO SOUTHERN ARGENTINA/GULF OF SAN MATIAS.
A 1023 HPA HIGH IS CENTERED AT 40S 60W. A 1018 HPA LOW IS
CENTERED AT 46S 47W WITH A COLD FRONT EXTENDING ALONG 40S 52W TO
A 1018 HPA LOW AT 34S 54W WITH A COLD FRONT EXTENDING ALONG 30S
50W TO SOUTHERN BRASIL/RIO GRANDE DO SUL. A 1029 HPA HIGH IS
LOCATED AT 30S 17W. A 1018 HPA LOW IS CENTERED NEAR 24S 32W WITH
A COLD FRONT EXTENDING TO 19S 37W TO EASTERN BRASIL/ESPIRITO
SANTO TO MATA GROSSO TO SELVA DE BOLIVIA.
GUZMAN...SENAMHI (BOLIVIA)
URRA.....DMC (CHILE)
MOREYRA...SENAMHI PERU
DANAHER..HPC (USA)
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