484
FXSA20 KWBC 071328
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
928 AM EDT TUE OCT 07 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z OCT 07). AT 200 HPA...THE SUBTROPICAL
RIDGE DIVIDES IN TWO DISTINCT CELLS...WITH ONE OVER THE EASTERN
TROPICAL PACIFIC AND THE OTHER OVER BRASIL. THE FORMER CENTERS ON
A CLOSED HIGH OFF THE COAST OF PERU NEAR 13S 96W...WHILE THE
LATTER CENTERS NEAR 08S 55W. A TROUGH ALONG 85W SEPARATES THESE
RIDGES. TROPICAL CONVECTION ACROSS BRASIL AND PERU REMAINS QUITE
ACTIVE...PARTICULARLY TRUE TO THE NORTH OF 10S AND WEST OF 50W.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH A FINGER EXTENDING
BETWEEN 46S 96W AND 56S 82W. IT REFORMS FARTHER SOUTH NEAR 61S
99W...ALONG 63S 65W...LAS MALVINAS...38S 56W...EXITING AT 48S
32W. IT HAS ANOTHER FINGER FARTHER SOUTH ALONG 72S 50W... EXITING
AT 61S 44W. THE NORTHERN POLAR LIES ALONG 39S 120W...34S
110W...EXITING AT 40S 89W. IT REFORMS AT 28S 56W...ALONG A 211 KT
MAXIMUM AT 37S 37W...41S 18W...EXITING AT 45S 06W. THE
SUBTROPICAL JET LIES ALONG 27S 120W...A 131KT MAXIMUM AT 30S
107W...33S 90W...EXITING AT 23S 84W. IT REFORMS AT 19S
55W...CROSSING 32S 35W...EXITING AT 33S 07W.
AT 500 HPA...SHORT WAVE PERTURBATIONS ARE STREAMING ACROSS THE
EASTERN PACIFIC...WITH ONE ALONG 110W AND SOUTH OF 25S...WHILE
ANOTHER IS MOVING ACROSS 95W AND SOUTH OF 40S. THESE ARE PUSHING
AGAINST A BLOCKING RIDGE WITH AXIS SOUTH ALONG 75W. DOWNSTREAM
FROM THIS RIDGE...A BROAD TROUGH EXTENDS BETWEEN 65W-20W AND
SOUTH OF 25S/30S. EMBEDDED IN THIS FLOW...A SECONDARY TROUGH
EXTENDS ALONG 50S 40W TO LA PAMPA IN ARGENTINA. FARTHER NORTH...
AN ELONGATED CYCLONIC VORTICITY TONGUE EXTENDS ALONG 40S 20W...
30S 35W...28S 45W...SAO PAULO TO MATO GROSSO DO SUL/NORTHERN
BOLIVIA.
AT LOW LEVELS...A RIDGE OVER THE EASTERN PACIFIC AND SOUTHERN
CONE CENTERS ON THREE HIGHS...A 1025 HPA AT 32S 85W...A 1025 HPA
HIGH AT 42S 76W...AND A 1029 HPA HIGH AT 42S 64W. EAST OF THIS
RIDGE...A BROAD TROUGH DOMINATES THE SOUTH ATLANTIC...WITH A
POLAR FRONT EXTENDING ALONG AN OCCLUDED 990 HPA LOW AT 50S
38W...46S 38W...A 998 HPA LOW AT 43S 42W...38S 46W...RIO DE LA
PLATA...CENTRAL CUYO TO SOUTHERN CHILE. ON THE NORTHERN
STREAM...OVER THE ATLANTIC...A RIDGE CENTERS ON TWO HIGHS...WITH
A 1021 HPA HIGH NEAR 28S 46W...AND A 1025 HPA NEAR 28S 34W. AN
ELONGATED FRONT LIES ALONG 28S 25W...23S 35W...RIO DE JANEIRO...
MATO GROSSO DO SUL TO NORTHERN BOLIVIA/SOUTHERN PERU. LIGHT
SCATTERED RAINFALL WAS REPORTED OVER RIO DE JANEIRO/NORTHERN SAO
PAULO AND SOUTHERN MINAS GERAIS...WITH DENSE CLOUD COVER WESTWARD
ACROSS MATO GROSSO DO SUL TO NORTHERN BOLIVIA. MOST ACTIVE
CONVECTION WAS BUILDING TO THE NORTH ALONG A PREFRONTAL TROUGH.
URRA...DMC (CHILE)
MOREYRA...SENAMHI PERU
DAVISON...HPC (USA)
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