062
FXSA20 KWBC 291402
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1002 AM EDT MON SEP 29 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 29). AT 200 HPA...THE UPPER ANALYSIS
SHOWS THE SUBTROPICAL RIDGE ACROSS NORTHERN SOUTH AMERICA... WITH
A CLOSED CELL ESTABLISHED OVER WESTERN AMAZONAS IN BRASIL. THE
RIDGE EXTENDS EAST ACROSS CENTRAL BRASIL ALONG 08S THEN INTO THE
SOUTH ATLANTIC OCEAN. A SHORT WAVE TROUGH EXTENDS SOUTH FROM
ESPIRITO SANTO TO NEAR 33S 37W. SATELLITE IMAGERY SHOWS SCATTERED
DEEP CONVECTION BUILDING OVER WESTERN BRASIL MAINLY WEST OF 60W.
SCATTERED CONVECTION IS ALSO DEVELOPING OVER PERU AND WESTERN
COLOMBIA.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET WITH A WIND MAXIMA
OF 140 KTS AT 55S 118W EXTENDING TO 50S 97W TO A 141 KTS MAXIMA
AT 58S 83W THEN TO 64S 55W.. 52W 35W.. TO 50S 10W. THE NORTH
POLAR JET EXTENDS ALONG 50S 120W... 44S 106W... 32S 100W... 28S
94W... 35S 87W... 45S 84W. JET CONTINUES ALONG 46S 45W... 43S 27W
TO 43 11W. ANOTHER NORTH POLAR JET EXTENDS ALONG 32S 26W TO 32S
10W TO 33S 00W. THE SOUTHERN TROPICAL JET EXTENDS ALONG 22S
100W... 25S 90W... TO AN EXIT REGION AT 30S 79W... AND RESUMES AT
32S 61W TO 31S 49W TO A 128 KT WIND MAXIMA AT 26S 43W THEN TO 17S
35W. THE NORTHERN TOPICAL JET EXTENDS ALONG 15S 100W... 23S
81W... TO A 141 KT WIND MAXIMA AT 25S 67W THEN ALONG 25S 54W TO
AND EXIT REGION AT 19S 45W.
AT 500 HPA...ANALYSIS SHOWS A SPLIT FLOW PATTERN OVER THE
SOUTHERN CONE WITH A RIDGE IN THE SOUTHERN STREAM ALONG 60W SOUTH
50S AND A SHORTWAVE TROUGH ALONG 60W BETWEEN 40S AND 50S. A DEEP
UPSTREAM TROUGH IS LOCATED ALONG 90W-95W SOUTH OF 25S TO 55S THEN
EXTENDING SOUTHWEST TO A CLOSED LOW NEAR 68S 108W. IN THE
NORTHERN STREAM A SHORTWAVE TROUGH JUST OFF THE COAST OF CENTRAL
CHILE EXTENDS FROM 24S 74S TO 36S 72W. OVER THE ATLANTIC OCEAN A
NORTHERN STREAM CLOSED LOW IS CENTERED NEAR 26S 40W. IN THE
SOUTHERN STREAM... A TROUGH EXTENDS NORTHWEST FROM A LOW NEAR 58S
15W TO 43S 30W.
AT LOW LEVELS...THE ANALYSIS SHOWS A 978 HPA LOW NEAR 60S 80W
WITH A COLD FRONT EXTENDING ALONG 55S 82W TO A 998 HPA LOW NEAR
49S 88W CONTINUING ALONG 44S 88W TO A 1010 HPA LOW AT 37S 91W
THEN TO 26S 94W. A 1021 HPA HIGH IS CENTERED NEAR 29S 81W WITH A
SECOND HIGH CENTER NEAR 38S 77W. A 982 LOW IS CENTERED NEAR 52S
13W WITH A COLD FRONT EXTENDING TO 45S 38W THEN AS A WARM FRONT
TO A 1018 HPA LOW AT 44S 54W. A COLD FRONT EXTENDS FROM THE LOW
TO 35S 56W TO BUENOS AIRES TO NORTHERN ARGENTINA. A SQUALL LINE
EXTENDS FROM SOUTHERN BRASIL NEAR 30S 50W NORTHWEST TO SOUTHERN
PARAGUAY TO NORTHERN ARGENTINA NEAR 22S 65W. A 1029 HPA HIGH IS
CENTERED NEAR 36S 41W. A 1018 LOW IS CENTERED NEAR 25S 35W WITH A
COLD FRONT EXTENDING ALONG 18S 35W... 15S 38W... SAN PAULO... TO
MATA GROSSO.
GUZMAN...SENAMHI (BOLIVIA)
URRA.....DMC (CHILE)
MOREYRA...SENAMHI PERU
DANAHER..HPC (USA)
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page