903
FXSA20 KWBC 021232
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
831 AM EDT WED SEP 02 2009
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 02). AT 200 HPA THE SUBTROPICAL
RIDGE CENTERS ON A HIGH OVER BRASIL NEAR 18S 57W...AND ENVELOPS
MID SECTIONS OF SOUTH AMERICA. THE SUBEQUATORIAL RIDGE...
MEANWHILE...CENTERS ON A HIGH AT 03S 42W. TROUGHS SEPARATE THESE
RIDGES...WITH ONE EXTENDING FROM 20S 35W TO 10S 50W...WHILE
ANOTHER EXTENDS TO THE SOUTHEAST FROM AMAZONIA IN EASTERN
COLOMBIA TO 10S 55W. TROPICAL CONVECTION NOW CONFINES TO AMAZONAS
IN WESTERN BRASIL...THE PERUVIAN JUNGLE AND EASTERN ECUADOR.
THE ANALYSIS AT 250 HPA SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
53S 64W...ALONG A 124KT MAXIMUM AT 48S 48W...46S 31W...A 155KT
MAXIMUM AT 45S 20W...EXITING AT 45S 00W. THE NORTHERN POLAR LIES
ALONG 33S 120W...A 148KT MAXIMUM AT 34S 117W...37S 108W...EXITING
AT 37S 99W. IT HAS A FINGER BETWEEN 33S 92W AND 27S 83W. THE
NORTHERN POLAR REFORMS AT 24S 81W...THEN ALONG A 153KT MAXIMUM AT
30S 70W...A 154KT MAXIMUM AT 36S 59W...40S 43W...A 154KT MAXIMUM
AT 41S 29W...AND 41S 16W. THE SUBTROPICAL JET LIES ALONG 28S
120W...A 151KT MAXIMUM AT 29S 115W...29S 103W...20S 93W...EXITING
AT 15S 85W. IT REFORMS AT 16S 83W...THEN ALONG 24S 70W...NORTHERN
URUGUAY...EXITING AT 31S 42W.
AT 500 HPA...A SOUTHERN STREAM LOW NEAR 66S 102W EXTENDS A TROUGH
ALONG 60S 110W...TO 53S 120W. ON THE NORTHERN STREAM...A BROAD
TROUGH LIES BETWEEN 145W-105W AND TO THE SOUTH OF 25S...WITH A
CLOSED LOW NEAR 40S 123W. AN INDUCED RIDGE ALONG 97W/100W
SEPARATES THIS SYSTEM FROM ANOTHER NORTHERN STREAM TROUGH OFF THE
COAST OF CHILE. THE TROUGH EXTENDS FROM 37S 80W TO 18S 85W. SHORT
WAVE ENERGY IS SPILLING EASTWARD ACROSS THE CENTRAL/NORTHERN
ANDES OF CHILE INTO ARGENTINA. OVER THE ATLANTIC...A BROAD/LOW
AMPLITUDE TROUGH EXTENDS BETWEEN 65W-10W AND TO THE SOUTH OF 35S.
THE SURFACE ANALYSIS SHOWS A RIDGE ON THE NORTHERN STREAM FLOW
OVER THE FAR EASTERN PACIFIC...CENTERING ON A 1029 HPA HIGH AT
42S 84W. A NARROW RIDGE OVER THE WESTERN ATLANTIC CENTERS ON TWO
HIGHS...A 1025 HPA HIGH AT 40S 54W AND A 1021 HPA HIGH AT 37S
39W. SOUTH OF THIS RIDGE...IN A TIGHT BELT OF MID/UPPER LATITUDE
WESTERLIES...A PROGRESSIVE FRONT EXTENDS ALONG A 990 HPA LOW AT
52S 41W...A 994 HPA TRIPLE POINT LOW AT 49S 38W...44S 40W...44S
46W...A 1006 HPA LOW AT 48S 49W...47S 57W...SOUTHERN
PATAGONIA...TO A 1014 HPA LOW AT 53S 79W. LIGHT RAINFALL WAS
NOTED OVER EXTREME SOUTHERN CHILE. A SECONDARY BOUNDARY TO THE
SOUTH LIES ALONG A 1000 HPA LOW AT 54S 57W...54S 62W...58S
75W...A 998 HPA LOW AT 61S 86W...AND 57S 90W. FARTHER NORTH...AN
ELONGATED FRONT LIES ALONG A 1014 HPA LOW AT 38S 26W...34S
40W...32S 50W...RIO GRANDE DO SUL...CHACO ARGENTINO TUCUMAN.
SCATTERED DEEP CONVECTION WAS NOTED OVER SOUTHERN BRASIL-URUGUAY
AND PORTIONS OF MESOPOTAMIA IN ARGENTINA.
GARCIA...SENAMHI (PERU)
MAZA...SMN (ARGENTINA)
DAVISON...HPC (USA)
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