SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
933 AM EDT FRI MAR 15 2013

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

SYNOPSIS (VALID FROM 00 UTC MAR 15): 200 HPA ANALYSIS AN
ELONGATED CELL OF THE SUBTROPICAL RIDGE CENTERING OVER EASTERN
RIO DO JANEIRO IN BRASIL AND RIDGING TO THE NORTHWEST INTO MATO
GROSSO-NORTHERN BOLIVIA AND CENTRAL PERU. TO THE NORTHEAST...A
TUTT EXTENDED ACROSS PERNAMBUCO INTO THE AMAZON DELTA. BEST UPPER
DIFFLUENCE AND DIVERGENCE WERE OCCURRING OVER THE WESTERN AMAZON
BASIN. THIS WAS VENTING WIDESPREAD DEEP CONVECTION FROM
GOIAS/TOCANTINS TO THE NORTHWEST INTO COLOMBIA-ECUADOR AND PERU.
ACTIVE CONVECTION WAS ALSO OCCURRING ACROSS COASTAL
ECUADOR/EXTREME NORTHERN PERU.

THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT 68S 65W
ALONG A 129 KT MAXIMA AT 67S 49W...A 149KT MAXIMA AT 63S
32W...58S 17W. THE NORTHERN POLAR FORMED AT 58S 78W ALONG 63S
62W...61S 39W...EXITING AT 56S 27W. IT REFORMED AT 52S 39W
EXITING OVER THE MALVINAS/FALKLANDS. IT REFORMED OVER CENTRAL
PATAGONIA ALONG LA PAMPA/SAN LUIS...RIO DE LA PLATA...A 128KT
MAXIMA AT 35S 49W...39S 38W...45S 22W. THE SUBTROPICAL JET FORMED
AT 26S 78W ALONG 28S 65W...A 130KT MAXIMA OVER RIO GRANDE DO
SUL...A 151 KT MAXIMA AT 33S 49W...A 150 KT MAXIMA AT 35S 35W...A
143KT MAXIMA AT 38S 26W.

AT MID-LEVELS...A LONG WAVE RIDGE EXTENDED OVER THE EASTERN
PACIFIC JUST OF THE COAST OF SOUTHERN CHILE. TO THE EAST...AN
EAST-WEST ORIENTED TROUGH EXTENDED FROM A LOW AT 45S 40W TO
ANOTHER LOW OVER NORTHERN PATAGONIA. THE TROUGH WAS FOCUSING ITS
ENERGY OVER PATAGONIA.

THE SURFACE ANALYSIS SHOWS A 1021 HPA HIGH OVER THE EASTER
PACIFIC AT 38S 82W. TO THE EAST...A 1029 HPA POLAR HIGH CENTERED
AT 46S 65W. A 1002 HPA LOW AT 44S 40W EXTENDED A FRONT ALONG A
1002 HPA LOW AT 43S 33W...35S 33W...30S 43W...28S 53W. LIGHT RAIN
AND DRIZZLE WAS OCCURRING INLAND IN NORTHWESTERN ARGENTINA BEHIND
THIS FRONT. A 1002 HPA LOW AT 37S 28W EXTENDED A FRONT ALONG 30S
29W...26S 35W...23S 41W...RIO DO JANEIRO...MATO GROSSO DO
SUL...CENTRAL PARAGUAY. SHOWERS AND THUNDERSTORMS WERE OCCURRING
TO THE NORTH AND NEAR THIS BOUNDARY.

CARDOZA...FAP (PERU)
MAQUEDA...DINAC (PARAGUAY)
GALVEZ...WPC (USA)