Prognostic Meteorological Discussion
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FXSA20 KWBC 241419
PMDSA

SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1019 AM EDT THU APR 24 2014

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

SYNOPSIS (VALID FROM 24 APRIL 00UTC): AT 200 HPA...THE
SUBEQUATORIAL RIDGE IS WELL ESTABLISHED OVER THE GUIANAS INTO
EASTERN VENEZUELA. THIS RIDGE IS VENTILATING CONVECTION IN ITS
WESTERN PERIPHERY ENHANCING ACTIVITY ACROSS MOST OF COLOMBIA AND
CENTRAL/NORTHWESTERN AMAZONIA. A SMALL TROUGH HAS FORMED OVER
WESTERN AMAZONIA AND IS AIDING WITH VENTILATION IN CENTRAL PARTS
OF THE AMAZON. A MUCH LARGER AND BETTER ORGANIZED TROUGH IS MOVING
TO THE EAST SOUTHEAST ACROSS EASTERN PARAGUAY-CENTRAL MATO GROSSO.
THIS TROUGH IS ENHANCING ACTIVITY ACROSS

AT 250 HPA...THE JET ANALYSIS SHOWS THE NORTHERN POLAR FORMING AT
49S 127W ALONG A 135KT MAXIMA AT 44S 114W...42S 105W...41S
96W...45S 86W...EXITING AT 51S 72W. A SMALL BRANCH OF THE
SUBTROPICAL JET FORMED AT 37S 84W EXITING AT 40S 72W. ANOTHER
BRANCH OF THE SUBTROPICAL JET FORMED AT 24S 54W ALONG 28S 46W...A
125KT MAXIMA AT 30S 39W...31S 31W...33S 34W...EXITING AT 32S 14W.

AT MID LEVELS...LARGE TROUGHS IN THE EXTREME SOUTHEASTERN PACIFIC
AND SOUTHERN ATLANTIC ARE MOVING VERY LITTLE WHILE PROGRESSING TO
THE EAST. LARGE RIDGE CONTINUES DOMINATING MOST OF CHILE AND
ARGENTINA YIELDING TO DRY CONDITIONS.

THE SURFACE ANALYSIS SHOWS A RIDGE EXTENDING FROM THE EXTREME
SOUTHERN ATLANTIC INTO THE EASTERN PACIFIC. THE RIDGE CENTERS IN
SEVERAL HIGHS. A 1025 HPA HIGH CENTERED AT 45S 60W...AND A 1021
HPA HIGH AT 33S 85W. A 1002 HPA LOW AT 44S 29W EXTENDED A COLD
FRONT ALONG 39S 39W...36S 52W...EXTREME SOUTHERN BUENOS AIRES
PROVINCE. A 1014 HPA LOW AT 28S 37W EXTENDED A COLD FRONT JUST TO
THE NORTH OF SANTOS IN SAO PAULO BRASIL. A 1016 HPA LOW AT 35S 34W
EXTENDED A FRONT INTO CABO FRIO IN BRASIL. NUMEROUS SHOWERS AND
THUNDERSTORMS WERE OCCURRING IN SOUTHEASTERN BRASIL ASSOCIATED
WITH THESE FRONTS AND SURFACE TROUGHS.

ITA...SENAMHI (PERU)
FERNANDES...INMET (BRASIL)
GALVEZ...WPC (USA)
$$





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