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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1402Z Nov 12, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
902 AM EST WED NOV 12 2014

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

SYNOPSIS (VALID FROM NOVEMBER 12 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS A BROAD CELL OF THE SUBTROPICAL RIDGE ENVELOPING NORTHWEST
PORTIONS OF SOUTH AMERICA...WHILE ANCHORING ON A CLOSED HIGH NEAR
10S 67W. TWO TROUGHS LIE TO THE EAST OF THIS RIDGE...WITH ONE
NORTH ALONG 36W TO 13S AND ANOTHER ALONG THE NORTH COAST OF BRASIL
TO NORTHERN PARA. RIDGE PATTERN ALOFT IS VENTING ORGANIZED DEEP
CONVECTION ACROSS NORTHERN PERU-ECUADOR TO SOUTHERN
COLOMBIA...WITH ISOLATED CONVECTION DOTTING AMAZONAS-ACRE IN
BRASIL. TROUGHS TO THE EAST...MEANWHILE...FAVOR SCATTERED
CONVECTION ACROSS MINAS GERAIS-BAHIA IN BRASIL.

THE 250 HPA JET ANALYSIS SHOWS A FINGER OF THE SOUTHERN POLAR WITH
ENTRANCE AT 61S 109W...THEN ALONG 59S 93W...A 122KT MAXIMUM AT 56S
81W...EXITING AT 49S 66W. ANOTHER FINGER TO THE NORTH LIES ALONG
122KT MAXIMUM AT 51S 119W...54S 114W...A 122KT MAXIMUM AT 55S
106W...54S 91W...EXITING AT 49S 80W. IT REFORMS AT 44S 58W...THEN
ALONG 48S 44W...50S 28W...47S 10W...AND 47S 01W. THE NORTHERN
POLAR LIES ALONG 46S 120W...50S 109W...A 123KT MAXIMUM AT 51S
99W...48S 89W...EXITING AT 42S 80W. A FINGER TO THE EAST EXTENDS
BETWEEN 35S 62W AND 37S 49W. THE SUBTROPICAL JET HAS ITS ENTRANCE
AT 37S 85W...ACROSS JUAN FERNANDEZ...32S 70W...31S 60W...EXITING
AT 32S 49W. A FINGER TO THE NORTH LIES BETWEEN 24S 70W AND 23S
60W. THE JET REFORMS AT 27S 43W...ALONG 21S 39W...EXITING AT 14S
36W.

AT MID LEVELS...THE 500 HPA ANALYSIS SHOWS AN UNUSUALLY DEEP
TROUGH THAT BOUNDS BETWEEN 70W-50W AND TO THE SOUTH OF 25S. THIS
IS FOCUSING SHORT WAVE VORTICES ACROSS THE SOUTHERN CONE...WITH
OTHER PERTURBATIONS STREAMING ACROSS PARAGUAY/MESOPOTAMIA VALLEY
IN ARGENTINA TO THE SOUTHERN STATES OF BRASIL. A RIDGE TO THE WEST
EXTENDS NORTH TO SOUTH ALONG 100W TO 60S...WHILE ONE TO THE EAST
LIES ALONG 40W.

AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A RIDGE ON THE NORTHERN
STREAM OVER THE EASTERN PACIFIC...WITH AXIS ANCHORING ON TWO 1029
HPA HIGHS...WITH ONE AT 32S 98W AND 38S 87W. SOUTH OF THIS
RIDGE...IN A TIGHT BELT OF UPPER LATITUDE WESTERLIES...A
PROGRESSIVE FRONT LIES ALONG 56S 102W...56S 92W...A 990 HPA LOW AT
56S 84W...52S 81W...TO 47S 80W. EAST OVER THE SOUTH ATLANTIC...AN
ELONGATED FRONT EXTENDS FROM AN OCCLUDED 990 HPA LOW AT 59S
32W...A 996 HPA LOW AT 57S 29W...54S 28W...52S 30W...49S 34W...47S
39W...48S 44W...A 1006 HPA LOW AT 49S 51W...47S 51W...46S 53W...A
1006 HPA LOW AT 45S 55W...43S 54W...39S 56W...A 1006 HPA LOW AT
37S 58W...34S 59W...TO MENDOZA IN ARGENTINA. SCATTERED DEEP
CONVECTION IS BUILDING AHEAD OF THIS BOUNDARY OVER BUENOS AIRES
PROVINCE TO ENTRE RIOS IN ARGENTINA. A BROAD RIDGE OVER THE
CENTRAL ATLANTIC CENTERS ON A 1021 HPA HIGH AT 41S 37W.

CAROCA...DMC (CHILE)
DURAN...SENAMHI (PERU)
DAVISON...WPC (USA)