SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
925 AM EDT WED MAY 22 2013

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

SYNOPSIS (VALID FROM 00 UTC MAY 22): THE 200 HPA ANALYSIS SHOWS A
WEAK RIDGE ACROSS THE ATLANTIC INTO THE NORTHEASTERN COAST OF
BRASIL. TO THE WEST...A BROAD TUTT EXTENDED OVER AMAZONAS IN
BRASIL. THESE FEATURES WERE ALLOWING FOR ISOLATED DEEP CONVECTION
ACROSS EASTERN AMAZONAS/PARA INTO THE AMAZON DELTA/AMAPA. QUIET
CONDITIONS WERE OCCURRING ELSEWHERE.

THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT 59S 110W
ALONG 52S 100W...A 133KT MAXIMA AT 50S 86W...EXITING TO THE
SOUTHEAST OF RIO GALLEGOS. THE NORTHERN POLAR JET EXTENDED ALONG A
128KT MAXIMA AT 45S 103W...45S 73W....EXITING AT 39S 67W. THE
SUBTROPICAL JET FORMED AT 13S 102W...18S 90W..A 131KT MAXIMA AT
27S 72W...A 137KT MAXIMA AT 30S 63W...A 146KT MAXIMA AT 30S
52W...A 134KT MAXIMA AT 26S 41W...19S 28W...24S 10W.

AT 500 HPA...THE MID-LEVEL ANALYSIS SHOWS A SOUTHERN STREAM TROUGH
CENTERING OVER THE BELLINGSHAUSEN SEA WHILE FOCUSING ITS ENERGY
OVER THE DRAKE PASSAGE INTO THE FALKLANDS. TO THE NORTH...WESTERLY
FLOW HAD ESTABLISHED OVER MOST OF THE CONTINENT WITH A FEW WEAK
SHORT WAVE PERTURBATIONS EMBEDDED. ONE OF THEM EXTENDED ALONG 45S
55W INTO BAHIA BLANCA-MENDOZA IN ARGENTINA. ANOTHER EXTENDED FROM
LA SERENA IN CHILE INTO 12S 100W.

THE SURFACE ANALYSIS SHOWS A 974 HPA LOW AT 5S 79W EXTENDING A
FRONT ALONG 50S 79W...47S 85W. A 1014 HPA LOW AT 45S 66W EXTENDED
A FRONT ALONG PENINSULA VALDEZ...NORTHERN NEUQUEN. A 1014 HPA LOW
AT 32S 48W EXTENDED A FRONT ALONG FLORIANOPOLIS...27S 48W. A 1010
HPA LOW AT 23S 17W EXTENDED A FRONT ALONG 16S 25W...18S
36W...SOUTHERN ESPIRITO SANTO...NORTHERN RIO DO JANEIRO...NORTHERN
SAO PAULO...MATO GROSSO DO SUL...NORTHERN PARAGUAY...SOUTH-CENTRAL
BOLIVIA

MAQUEDA...DINAC (PARAGUAY)
SILVA DE SOUZA...INMET (BRASIL)
DAVISON...WPC (USA)
GALVEZ...WPC (USA)