767
FXSA20 KWBC 261257
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
856 AM EDT FRI SEP 26 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 26). AT 200 HPA...UPPER ANALYSIS
SHOWS THE SUBTROPICAL RIDGE BUILDING ACROSS NORTHERN SOUTH
AMERICA...WITH CLOSED CELL ESTABLISHING OVER MATO GROSSO/SOUTHERN
AMAZONAS IN BRASIL. THE RIDGE NOW ENVELOPS AREA NORTH OF
15S...WITH SHORT WAVE TROUGHS STREAMING ACROSS SOUTHERN AND
SOUTHEAST BRASIL. SATELLITE IMAGERY SHOWS ORGANIZED DEEP
CONVECTION BUILDING OVER THE CONTINENT TO THE NORTH OF 10S AND
WEST OF 48W...WITH CELLS SPREADING WEST INTO CENTRAL/NORTHERN
PERU.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG A 146KT
MAXIMUM AT 45S 120W...53S 102W...48S 92W...EXITING AT 51S 84W. IT
REFORMS AT 58S 67W...ALONG 66S 55W...EXITING AT 62S 31W. THE
NORTHERN POLAR LIES ALONG 40S 120W...28S 107W...26S 93W...EXITING
OVER JUAN FERNANDEZ ISLAND. IT REFORMS AT 37S 77W...THEN ACROSS
ISLA DE CHILOE...SOUTHERN PATAGONIA...A 127KT MAXIMUM AT 52S
64W...54S 55W...EXITING AT 50S 50W. IT REFORMS NEAR 28S
32W...THEN ALONG 31S 20W...EXITING AT 39S 13W. THE SUBTROPICAL
JET HAS ITS ENTRANCE AT 17S 107W...ALONG A 148KT MAXIMUM AT 23S
89W...27S 71W...A 125KT MAXIMUM AT 27S 61W...EXITING NEAR 17S
45W. IT REFORMS AT 18S 36W...ALONG 21S 21W...AND 32S 08W.
AT 500 HPA...ANALYSIS SHOWS A SHORT WAVE TROUGH ON THE SOUTHERN
STREAM FLOW MOVING ALONG 94W TO 44S. ANOTHER TROUGH EXTENDS FROM
65S 75W...ALONG 57S 65W...ACROSS SOUTHERN PATAGONIA/TIERRA DEL
FUEGO...43S 80W...TO 38S 85W. A NORTHERN STREAM VORTEX SHEARED
FROM THIS AXIS...AND NOW CENTERS ON A CYCLONIC MAXIMUM NEAR 30S
80W. THE LATTER EXTENDS BETWEEN 95W-78W AND SOUTH OF 18S. A
SKEWED RIDGE LIES TO THE EAST...WITH AXIS ACROSS SOUTHERN
BOLIVIA/JUJUY-SALTA IN NORTHWEST ARGENTINA...LA PAMPA...50S
50W...THEN ALONG 50W TO JUST EAST OF THE ANTARCTIC PENINSULA. A
SHORT WAVE TROUGH IS MOVING ACROSS URUGUAY/MESOPOTAMIA TO
SOUTHERN BRASIL. FARTHER EAST...ON THE NORTHERN STREAM...A TROUGH
EXTENDS BETWEEN 35W-10W AND SOUTH OF 20S...CENTERING ON A CLOSED
LOW NEAR 38S 21W.
AT LOW LEVELS...THE ANALYSIS SHOWS AN OCCLUDED 962 HPA LOW AT 59S
93W...WITH A FRONT ALONG 61S 97W...A 974 HPA LOW AT 55S 87W...45S
91W...AND 40S 104W. ANOTHER FRONT ORIGINATES ON AN OCCLUDED 9970
HPA LOW AT 65S 75W...ALONG A 974 HPA TRIPLE POINT LOW AT 65S
67W...58S 61W...A 1002 HPA LOW AT 55S 63W...48S 66W...CENTRAL/
NORTHERN PATAGONIA...A 1018 HPA LOW AT 43S 77W...JUAN
FERNANDEZ...A 1018 HPA LOW AT 31S 85W...AND 24S 86W. ON THE
NORTHERN STREAM...OVER THE PACIFIC...A BROAD RIDGE ANCHORS ON A
1025 HPA HIGH AT 31S 101W. OVER THE WESTERN ATLANTIC...A RIDGE
OFF THE COAST OF URUGUAY/ARGENTINA CENTERS ON A 1029 HPA HIGH AT
38S 46W. A TROUGH OVER THE CENTRAL ATLANTIC CENTERS ON A DEEP 994
HPA LOW AT 37S 22W...WITH A POLAR FRONT ALONG A 1006 HPA LOW AT
40S 15W...36S 09W...A 1014 HPA LOW AT 30S 13W...21S 24W...15S
36W...ESPIRITO SANTO-MINAS GERAIS-MATO GROSSO TO NORTHERN
BOLIVIA. ISOLATED RAINFALL WAS NOTED ON THE SERRA DO MAR...WITH
DEEP CONVECTION ACROSS MINAS GERAIS AND BAHIA.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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