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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1333Z Aug 15, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
933 AM EDT FRI AUG 15 2014

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

SYNOPSIS (VALID FROM AUGUST 15 AT 00UTC): AT 200 HPA...AN
EAST-TO-WEST RIDGE EXTENDS ACROSS NORTHERN SOUTH
AMERICA...ENVELOPING AREA TO THE NORTH OF 10S WHILE CENTERING ON A
CLOSED HIGH AT 02S 57W. THIS IS VENTING DEEP CONVECTION ACROSS
EQUATORIAL SOUTH AMERICA AND NORTHWARD...WITH MOST ACTIVE ALONG
THE NEAR EQUATORIAL TROUGH OVER VENEZUELA.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH
ENTRANCE AT 49S 101W...ALONG 51S 90W...EXITING AT 54S 75W. IT HAS
A FINGER TO THE NORTH WITH ENTRANCE AT 47S 81W...ALONG 49S
74W...EXITING AT 49S 76W. IT REFORMS AT 47S 52W...THEN ALONG 43S
45W...38S 34W...A 138KT MAXIMUM AT 45S 13W...AND 49S 02W. THE
NORTHERN POLAR LIES ALONG 32S 120W...A 140KT MAXIMUM AT 34S
110W...36S 96W...EXITING AT 37S 81W. IT REFORMS AT 38S 55W...ALONG
32S 48W...29S 37W...32S 29W...A 153KT MAXIMUM AT 38S 19W...AND A
138KT MAXIMUM AT 42S 08W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
19S 79W...ALONG 24S 68W...25S 47W...25S 40W...29S 25W...AND 40S
01W.

AT 500 HPA...BROAD TROUGH EXTENDS ACROSS THE EASTERN
PACIFIC...WITH AXIS BETWEEN 120W-70W AND TO THE SOUTH OF 30S. A
DEEP LOW NEAR 61S 92W ANCHORS THIS TROUGH. THIS TROUGH IS FOCUSING
SHORT WAVE ENERGY AND SUBTROPICAL MOISTURE ACROSS SOUTHERN
CHILE-PATAGONIA IN ARGENTINA. A RIDGE TO THE EAST EXTENDS
NORTH-TO-SOUTH ALONG 57W/58W TO THE WEDDELL SEA/ANTARCTIC
PENINSULA. DOWNSTREAM FROM THIS AXIS...IN A HIGHLY AMPLIFIED
SINUSOIDAL WAVE PATTERN...A TROUGH EXTENDS BETWEEN 45W-05W AND TO
THE SOUTH OF 25S. FARTHER NORTH...A MID LEVEL RIDGE EXTENDS WEST
ACROSS THE TROPICAL ATLANTIC TO BRASIL-NORTHERN BOLIVIA...WHERE IT
SUSTAINS A TRADE WINDS CAP.

AT LOW LEVELS...A BROAD TROUGH ON THE SOUTHERN STREAM EXTENDS
NORTH FROM THE BELLINGSHAUSEN SEA TO THE SOUTHERN CONE OF SOUTH
AMERICA. A POLAR FRONT EMBEDS IN THIS FLOW AS IT ORIGINATES ON AN
OCCLUDED 950 HPA LOW AT 63S 77W...A 964 HPA LOW AT 60S 71W...56S
64W...53S 63W...A 994 HPA LOW AT 50S 65W...46S 62W...NORTHERN
PATAGONIA-PUERTO MONTT CHILE...44S 75W...A 1002 HPA LOW AT 42S
82W...37S 81W...TO 32S 85W. A BROAD TROUGH DOMINATES FLOW ACROSS
THE SOUTH ATLANTIC... ANCHORING ON A DEEP OCCLUDED 964 HPA LOW AT
53S 31W. THIS EXTENDS A POLAR FRONT ALONG 29S 21W...24S 32W...RIO
DE JANEIRO...18S 51W... RONDONIA/NORTHERN BOLIVIA TO ACRE IN
BRASIL. A MODIFYING POLAR RIDGE TO THE SOUTH CENTERS ON TWO 1029
HPA HIGHS...WITH ONE AT 28S 37W AND THE OTHER AT 28S 49W.

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