299
FXSA20 KWBC 291313
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
913 AM EDT FRI AUG 29 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z AUG 29). AT 200 HPA...THE SUBTROPICAL
RIDGE SPLITS IN TWO CELLS...ONE OVER PERU/EASTERN PACIFIC AND THE
OTHER OVER THE TROPICAL ATLANTIC/NORTHEAST BRASIL. THE
WESTERNMOST RIDGE IS CENTERED ON A PAIR OF CLOSED HIGHS...ONE
NEAR 15S 94W...AND THE OTHER NEAR 14N 82W. THE RIDGE AXIS EXTENDS
EAST ACROSS SOUTHERN PERU/BOLIVIA/SOUTHWEST BRASIL...THEN
SOUTHEAST INTO MATO GROSSO BRASIL. THE EASTERNMOST RIDGE AXIS
EXTENDS FROM A HIGH CENTER NEAR 09S 23W TO NORTHEAST BRASIL. A
TROUGH AXIS EXTENDING FROM 45S 60W TO NEAR 18S 65W SEPARATES THE
RIDGES. TROPICAL CONVECTION WILL FOCUS OVER NORTHERN PARA-
AMAZONAS IN WESTERN BRASIL...SPREADING INTO SOUTHERN
VENEZUELA/SOUTHERN COLOMBIA/ECUADOR. OTHER CONVECTION WAS FOUND
IN THE NORTHEAST CORNER OF BRASIL.
THE SOUTHERN POLAR JET IS ANALYZED AT 250 HPA WITH AXIS ALONG 34S
118W...39S 99W...EXITING AT 41S 76W. THE SOUTHERN POLAR JET
REFORMS AT 47S 50W... ALONG 52S 25W...EXITING AT 44S 01W. THE
NORTHERN POLAR JET LIES ALONG 30S 120W...159KT MAXIMUM AT 34S
101W...149 KT MAXIMUM AT 36S 83W...ALONG 32S 70W...27S 61W...38S
50W...TO A 168KT MAXIMUM AT 46S 40W...174KT MAXIMUM AT 47S
19W...ALONG 40S 14W...EXITING AT 33S 14W. THE NORTHERN POLAR JET
REFORMS AT 30S 15W...ALONG 28S 08W. THE SUBTROPICAL JET LIES
ALONG 21S 120W...28S 100W...27S 79W...EXITING AT 18S 64W. THE
JET REFORMS AT 20S 58W...ALONG 23S 52W...AND EXITS AT 30S 46W.
THE JET REFORMS AT 19S 28W...EXTENDS ALONG 23S 10W...25S 01W.
AT 500 HPA...A COMPLEX TROUGH SYSTEM IS ANCHORED BY A CLOSED LOW
CENTERED NEAR 60S 130W. ONE TROUGH AXIS EXTENDS NORTHEASTWARD
ALONG 55S 90W TO 45S 82W. FARTHER WEST...ANOTHER TROUGH AXIS
EXTENDS FROM 50S 95W NORTHWEST ALONG 45S 100W...40S 110W...35S
120W TO 28S 130W. D0WNSTREAM...A LOW AMPLITUDE RIDGE EXTENDS FROM
PATAGONIA ALONG 60S 75W TO 55S 95W. A BROAD TROUGH EXTENDS NORTH
FROM 50S 50W ACROSS EASTERN ARGENTINA/URUGUAY/SOUTHERN PARAGUAY
TO NEAR 20S 55W. DOWNSTREAM OF THIS TROUGH...A RIDGE AXIS EXTENDS
SOUTHEAST FROM A HIGH CENTER OVER SOUTHEASTERN BRASIL NEAR 22S
44W ALONG 32S 34W TO NEAR 34S 22W...UNDERCUTTING A UPPER
TROUGH/LOW CENTERED NEAR 28S 25W.
AT THE SURFACE...A 997 HPA OCCLUDED LOW IS CENTERED AT 28S
84W...WITH AN ASSOCIATED 1008 HPA TRIPLE POINT LOW AT 48S 76W.
THIS LOW EXTENDS A COLD FRONT ALONG 36S 80W TO A 1016 HPA LOW AT
33S 97W...WITH A COLD FRONT ALONG 27W 107W. A PAIR OF 1027 HPA
SUBTROPICAL HIGHS ARE CENTERED AT 28S 85W AND 36S 72W. A 1004 HPA
OCCLUDED LOW IS CENTERED AT 48S 52W. A 1002 HPA LOW AT 35S
50W...EXTENDS A COLD FRONT ACROSS PORTO ALEGRE...NORTHERN
PARAGUAY...AND NORTH CENTRAL BOLIVIA. A 1027 HPA SUBTROPICAL HIGH
IS CENTERED AT 33S 22W.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
BRENNAN...HPC (USA)
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