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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1339Z Aug 25, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
939 AM EDT MON AUG 25 2014

GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/

SYNOPSIS (VALID FROM AUGUST 25 AT 00UTC): AT 200 HPA...A CLOSED
HIGH OVER CENTRAL PERU EXTENDS A RIDGE WEST INTO THE EASTERN
TROPICAL PACIFIC ALONG 10S. THE HIGH ALSO RIDGES SOUTH ALONG 80W
TO 57S. EAST OF THIS AXIS...A SHORT WAVE TROUGH EXTENDS ACROSS
BRASIL...WITH AXIS NORTHWEST FROM RIO DE JANEIRO/NORTHERN SAO
PAULO...ACROSS TOCANTINS/GOIAS TO PARA. THIS WAS ENHANCING DIURNAL
CONVECTION OVER AND NEAR ILHA DE MARAJO...WHILE WIDELY ISOLATED
CONVECTION TO THE WEST WAS BUILDING ACROSS PARA-AMAZONAS IN BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
42S 99W...ALONG 47S 94W...EXITING AT 50S 83W. IT REFORMS AT 61S
51W...ALONG 56S 41W...47S 33W...A 157KT MAXIMUM AT 40S 20W...40S
11W...EXITING AT 40S 03W. THE NORTHERN POLAR LIES ALONG 40S
120W...A 121KT MAXIMUM AT 40S 110W...A 138KT MAXIMUM AT 31S
106W...25S 102W...EXITING AT 33S 92W. IT REFORMS AT 43S
79W...ALONG 35S 75W...A 122KT MAXIMUM AT 31S 67W...32S 59W...A
120KT MAXIMUM AT 42S 50W...A 145KT MAXIMUM AT 40S 30W...A 141KT
MAXIMUM AT 36S 17W...AND A 137KT MAXIMUM AT 33S 01W. THE
SUBTROPICAL JET HAS ITS ENTRANCE AT 17S 113W...ALONG 21S
100W...26S 90W...26S 80W...23S 73W...EXITING AT 19S 62W. IT HAS A
FINGER THAT LIES BETWEEN 23S 57W AND 30S 49W. THE SUBTROPICAL
REFORMS AT 33S 43W...ALONG 32S 28W...28S 10W...AND 28S 00W.

AT 500 HPA...A NORTH-TO-SOUTH RIDGE OVER THE EASTERN PACIFIC
EXTENDS ALONG 85W TO 50S. EAST OF THIS AXIS...A SPLIT FLOW PATTERN
ENVELOPS THE SOUTHERN CONE...WITH FLOW DIVIDING BETWEEN A RIDGE TO
THE SOUTH AND A TROUGH TO THE NORTH. THE RIDGE CENTERS ON A CLOSED
HIGH NEAR 47S 64W...WITH AXIS ACROSS THE DRAKE PASSAGE. THE
TROUGH... MEANWHILE...EXTENDS BETWEEN 75W-55W AND TO THE SOUTH OF
20S...CENTERING ON A CLOSED LOW OVER LA PAMPA IN ARGENTINA. THIS
IS FOCUSING SHORT WAVE ENERGY ACROSS MENDOZA-CORDOBA IN ARGENTINA
TO RIO DE LA PLATA BASIN.

AT LOW LEVELS...IN A SPLIT FLOW PATTERN...A RIDGE ON THE SOUTHERN
STREAM CENTERS ON TWO HIGHS...A 1033 HPA HIGH AT 44S 71W AND A
1029 HPA HIGH AT 49S 64W. A TROUGH LIES TO THE NORTH...ENVELOPING
MID SECTIONS OF SOUTH AMERICA. EMBEDDED IN THIS AXIS...AN OCCLUDED
1006 HPA LOW CENTERS NEAR 39S 63W. AN OCCLUDED 1002 HPA LOW NEAR
MAR DEL PLATA EXTENDS A FRONT ALONG A 998 HPA TRIPLE POINT LOW AT
35S 54W...RIO GRANDE DO SUL...MISIONES/POSADA-PARAGUAY TO SOUTHERN
BOLIVIA. MOST ACTIVE CONVECTION IS BUILDING ACROSS LA PAMPA-BUENOS
AIRES PROVINCE IN ARGENTINA UNDER INFLUENCE OF THE OCCLUDED LOWS.

CAROCA...DMC (CHILE)
JALFIN...SMN (ARGENTINA)
DAVISON...WPC (USA)