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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1437Z Nov 17, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
937 AM EST MON NOV 17 2014

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

SYNOPSIS (VALID FROM NOVEMBER 17 AT 00UTC): AT 200 HPA...A BROAD
CELL OF THE SUBTROPICAL RIDGE DOMINATES CONTINENTAL AREA TO THE
NORTH OF 20S...WITH AXIS ANCHORING ON A CLOSED HIGH NEAR 12S 45W.
RIDGE ALOFT IS VENTING DEEP CONVECTION OVER THE CONTINENT TO THE
NORTH OF 13S...WITH MOST INTENSE CLUSTERING OVER NORTHEAST BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT
47S 92W ALONG A 143KT MAXIMA AT 49S 82W...56S 61W...EXITING AT 47S
42W. THE NORTHERN POLAR JET EXTENDS ALONG 30S 120W...34S 109W...A
144KT MAXIMA AT 40S 96W...48S 79W...50S 57W...38S 45W...45S 27W. A
BRANCH OF THE SUBTROPICAL JET EXTENDS ALONG 21S 112W...29S
105W...34S 97W...EXITING AT 38S 87W. ANOTHER BRANCH FORMS AT 21S
78W EXTENDING ALONG 25S 74W...EXITING AT 28S 68W. IT REFORMS AT
28S 63W ALONG 25S 55W...EXITING AT 21S 48W. IT REFORMS AT 21S 41W
ALONG 24S 32W...EXITING AT 31S 27W.

AT 500 HPA...A LONG WAVE RIDGE EXTENDS TO THE SOUTH-SOUTHEAST FROM
A HIGH AT 39S 134W...ALONG 55S 120W...60S 120W...TO 70S 125W. EAST
OF THIS AXIS...A LONG WAVE TROUGH NOW EXTENDS ALONG 63S 83W...TO
50S 100W. THIS IS PHASING WITH AN ELONGATED TROUGH TO THE EAST AND
NORTH...AS THE LATTER EXTENDS FROM TIERRA DEL FUEGO...ALONG 47S
90W...40S 105W...35S 115W...TO 30S 130W. DOWNSTREAM FROM THIS
AXIS...A LOW AMPLITUDE RIDGE EXTENDS FROM CENTRAL
ARGENTINA...ACROSS THE MALVINAS/FALKLAND ISLANDS TO THE NORTHERN
TIP OF THE ANTARCTIC PENINSULA. A TROUGH TO THE EAST EXTENDS FROM
60S 15S...ALONG 50S 25W...40S 40W...TO RIO GRANDE DO SUL IN
BRASIL. A SHORT WAVE TROUGH TO THE NORTH EXTENDS FROM A LOW NEAR
32S 34W TO RIO DE JANEIRO.

THE SURFACE ANALYSIS SHOWS A 976 HPA LOW AT 57S 71W EXTENDING A
FRONT ALONG A 988 HPA LOW AT 57S 63W...55S 62W...53S 67W. RAINFALL
WAS OCCURRING IN SEVERAL LOCATIONS AT TIERRA DEL FUEGO. A 1000 HPA
LOW AT 51S 76W EXTENDS A FRONT ALONG 47S 76W...45S 79W...43S
84W...A 1012 HPA LOW AT 42S 93W...39S 92W...34S 97W. A 1006 HPA
LOW AT 30S 31W EXTENDS A FRONT ALONG 25S 30W...19S 33W...13S 38W.
THIS WAS GENERATING WIDESPREAD RAINFALL IN PARTS OF CENTRAL BRASIL.

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