808
FXSA20 KWBC 161338
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
937 AM EDT TUE SEP 16 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 16). AT 200 HPA...THE PATTERN
REMAINS NEARLY UNCHANGED...WITH A LOW AMPLITUDE/SHORT WAVE RIDGE
OVER WESTERN BRASIL/PERU...WHILE A NORTHERN HEMISPHERE LOW (COLD
CORE) CENTERS NEAR 03S 37W ANCHORING A TROUGH ALONG THE NORTHERN
COAST OF BRASIL. TROPICAL CONVECTION CONFINES TO PARA-AMAZONAS IN
BRASIL...WITH MOST INTENSE NORTH OF THE EQUATOR OVER VENEZUELA-
COLOMBIA. FARTHER SOUTH...ISOLATED CONVECTION WAS DOTTING THE
SIERRA OF PERU AND NORTHERN JUNGLE REGION.
THE 250 HPA JET ANALYSIS SHOWS A FINGER OF THE SOUTHERN POLAR
WITH ENTRANCE AT 42S 95W...A 125KT MAXIMUM AT 45S 89W...EXITING
AT 53S 69W. IT REFORMS AT 66S 33W...ALONG 55S 21W...AND 49S 03W.
THE NORTHERN POLAR LIES ALONG 35S 120W...33S 99W...42S 85W...
EXITING AT 45S 68W. IT REFORMS NEAR 30S 47W...THEN ALONG 32S
35W...EXITING AT 39S 24W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
29S 116W...ALONG A 132KT MAXIMUM AT 28S 104W...EXITING AT 30S
89W. IT REFORMS FARTHER EAST NEAR 25S 63W...CROSSING 26S 31W...
33S 20W...36S 04W. IT HAS A FINGER FARTHER NORTH...WITH ENTRANCE
AT 18S 45W...ALONG 19S 36W...EXITING AT 22S 26W.
AT 500 HPA...A HIGH AMPLITUDE/LONG WAVE TROUGH EXTENDS NORTH
ALONG 95W/100W TO JUST SOUTH OF 20S. THE TROUGH IS FOCUSING ITS
SHORT WAVE ENERGY INTO EXTREME SOUTHERN CHILE...MEANWHILE PUSHING
AGAINST A SKEWED RIDGE THAT EXTENDS ALONG 30S 70W...43S 60W...50S
40W...THEN SOUTH ALONG 60S 45W...TO 75S 50W. EAST OF THIS
RIDGE...ON THE NORTHERN STREAM FLOW...A LOW NEAR 38S 36W EXTENDS
A SHORT WAVE TROUGH WEST-NORTHWEST TO SOUTHERN BRASIL.
AT LOW LEVELS...ON THE NORTHERN STREAM...AN OCCLUDED 986 HPA LOW
AT 47S 96W EXTENDS A FRONT ALONG 47S 92W...A 1000 HPA LOW AT 43S
94W...37S 98W...TO 35S 107W. ANOTHER FRONT EXTENDS ALONG A 996
HPA LOW AT 48S 86W...ALONG A 1002 HPA LOW AT 47S 83W...38S
87W...AND 31S 97W. A THIRD BOUNDARY EXTENDS ALONG A 988 HPA LOW
AT 73S 62W...59S 63W...A 1010 HPA LOW AT 53S 63W...WITH A 1014
HPA LOW AT 49S 69W EXTENDING A FRONT ACROSS NORTHERN
PATAGONIA...PUERTO MONTT CHILE...A 1018 HPA LOW AT 37S 82W...32S
88W...TO A 1018 HPA LOW AT 30S 95W. A RIDGE OVER THE ATLANTIC
CENTERS ON A 1035 HPA HIGH AT 50S 40W. NORTH OF THIS SYSTEM... IN
A SPLIT FLOW PATTERN...A TROUGH DOMINATES THE NORTHERN STREAM...
WITH A 1002 HPA LOW AT 37S 36W...WITH A 1010 HPA LOW AT 38S 23W.
A FRONT EXTENDS FROM THE LATTER ALONG A 1014 HPA LOW AT 37S
16W...27S 23W...22S 36W...RIO DE JANEIRO/SOUTHERN MINAS GERAIS-
MATO GROSSO DO SUL TO NORTHERN BOLIVIA. ISOLATED TO SCATTERED
CONVECTION WAS BUILDING OVER RIO DE JANEIRO/NORTHERN SAO PAULO
AND MINAS GERAIS.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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