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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1321Z Oct 27, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
921 AM EDT MON OCT 27 2014

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

SYNOPSIS (VALID FROM OCTOBER 27 AT 00UTC): NORTH OVER THE
CONTINENT AND AT UPPER LEVELS...WELL DEFINED TROUGH EXTENDS ACROSS
RIO DO JANEIRO INTO MINAS GERAIS AND THEN INTO GOIAS. THIS IS
VENTILATING WIDESPREAD DEEP CONVECTION IN AREAS OF RIO DO
JANEIRO/ESPIRITO SANTO...AND INTO AREAS IN CENTRAL BRASIL. A
CLOSED LOW CENTERS OVER PARAGUAY. THIS LOW IS INTERACTING WITH A
WARM AND STABLE AIR MASS OVER PARAGUAY...BUT IS VENTILATING
CONVECTION IN AREAS TO THE NORTH ACROSS MATO GROSSO AND MATO
GROSSO DO SUL.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET
EXTENDING ALONG 48S 109W...48S 98W...58S 79W...54S 48W...A 130KT
MAXIMA AT 56S 21W...A 128KT MAXIMA AT 49S 04W. THE NORTHERN POLAR
EXTENDS FROM 39S 120W ALONG 32S 103W...32S 90W...29S 78W...A 143KT
MAXIMA AT 40S 69W...44S 59W...A 164KTT MAXIMA AT 44S 49W...EXITING
AT 39S 35W. THE SUBTROPICAL JET EXTENDS ALONG 25S 78W...32S
68W...39S 52W...32S 44W...EXITING AT 23S 47W. IT REFORMS AT 23S
40W...ALONG 32S 31W...31S 17W.

AT 500 HPA...A SHORT WAVE TROUGH EXTENDS OFF THE COAST OF CENTRAL
CHILE CENTERING ON A LOW AT 30S. THIS LOW WAS GRADUALLY IMPINGING
INTO THE ANDES...STARTING TO SPILL CYCLONIC VORTICITY INTO CENTRAL
PORTIONS OF ARGENTINA. TO THE NORTH...A STRONG RIDGE CENTERED ON
TWO HIGHS. ONE OVER ANTOFAGASTA AND THE OTHER OVER CORRIENTES IN
ARGENTINA. TO THE SOUTH...A SHORT WAVE TROUGH WAS CROSSING THE
SOUTHERN ANDES ACROSS THE AYSEN REGION IN CHILE INTO SOUTHERN
PORTIONS OF PATAGONIA.

AT LOW LEVELS...A 958 HPA LOW AT 60S 84 EXTENDS A FRONT ALONG 56S
79W...51S 89W...42S 105W. A 970 HPA LOW AT 58S 33W EXTENDS A FRONT
ALONG 54S 33W...50S 38W...49S 47W...49S 60W...A 1002 HPA LOW AT
49S 68W...46S 69W...45S 73W...44S 78W. A 998 HPA LOW AT 46S 45W
EXTENDS A FRONT INTO 42S 47W...38S 53W...36S 47W...A 1002 HPA LOW
AT 35S 65W...AND A FORMING COLD FRONT INTO 32S 66W. A 1018 HPA LOW
AT 27S 36W EXTENDS A FRONT INTO EASTERN RIO DO JANEIRO. WIDESPREAD
THUNDERSTORMS WERE OCCURRING ACROSS RIO DO JANEIRO AND ESPIRITO
SANTO.

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