THE WEATHER PREDICTION CENTER

COLLEGE PARK, MD


SOUTH AMERICAN SYNOPSIS




SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
940 AM EST FRI FEB 27 2015

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

SYNOPSIS (VALID FROM FEBRUARY 27 AT 00UTC): NORTH OVER THE
CONTINENT...AT 200 HPA...A WANING TROUGH EXTENDS ALONG 23S
47W...20S 50W...18S 60W...10S 66W TO AMAZONAS IN BRASIL. THIS
TROUGH SEPARATES THE SUBTROPICAL RIDGE FROM THE SUBEQUATORIAL
RIDGE. THE SUBTROPICAL RIDGE CONFINES TO SOUTHEAST
BRASIL-PARAGUAY-NORTHERN CHILE/SOUTHERN PERU...WHILE CENTERING ON
A CLOSED HIGH OVER CENTRAL PARAGUAY. THE SUBEQUATORIAL RIDGE LIES
TO THE NORTH...EXTENDING ACROSS PARA-NORTHEAST STATES OF BRASIL
WHILE CENTERING ON AN ILL ORGANIZED HIGH NEAR 05S 58W. TROPICAL
CONVECTION CONTINUES TO CLUSTER ALONG THE NEAR EQUATORIAL TROUGH
OVER NORTHERN BRASIL...WHILE OTHER CONVECTION DOTTED THE SIERRA OF
PERU-ALTIPLANO OF BOLIVIA AND NORTHWEST ARGENTINA.

AT 250 HPA THE SOUTHERN POLAR HAS ITS ENTRANCE AT 55S 103W...THEN
ALONG 61S 97W...EXITING AT 68S 84W. IT REFORMS AT 69S 68W...ALONG
61S 62W...EXITING AT 53S 57W. THE NORTHERN POLAR HAS ITS ENTRANCE
AT 42S 113W...ALONG 45S 106W...A 147KT MAXIMUM AT 50S 100W...A
150KT MAXIMUM AT 59S 92W...61S 81W...A 138KT MAXIMUM AT 56S
70W...45S 56W...EXITING AT 46S 35W. THE SUBTROPICAL JET HAS ITS
ENTRANCE AT 34S 118W...ALONG 39S 107W...EXITING AT 51S 90W. IT
REFORMS AT 50S 74W...ALONG 46S 67W...EXITING AT 42S 61W. IT HAS A
FINGER TO THE NORTH BETWEEN 36S 73W AND 35S 79W. THE SUBTROPICAL
JET REFORMS AT 26S 78W...ALONG 32S 64W...SOUTHERN URUGUAY...34S
35W...39S 18W... AND 45S 00W.

AT 500 HPA...A RIDGE NOW EXTENDS FROM A CLOSED HIGH NEAR 40S
98W...ALONG 50S 90W...60S 90W...TO THE BELLINGSHAUSEN
SEA/ANTARCTIC PENINSULA. A BROAD TROUGH TO THE EAST EXTENDS
BETWEEN 75W-30W AND TO THE SOUTH OF 30S...WHILE ANCHORING ON A
CLOSED LOW NEAR 67S 50W. A STRONG SHORT WAVE TROUGH REVOLVES
AROUND THIS AXIS...WITH AXIS NORTHWEST FROM 53S 60W TO 44S 74W. ON
THE NORTHERN STREAM...MEANWHILE...A SHORT WAVE TROUGH MEANDERS OFF
THE COAST OF CHILE...CENTERING ON A CLOSED LOW NEAR 33S 87W. THIS
IS SHEARING SHORT WAVE VORTICES ACROSS THE CENTRAL ANDES INTO CUYO
IN ARGENTINA-THEN EASTWARD ACROSS CENTRAL PROVINCES TO
URUGUAY/SOUTHERN STATES OF BRASIL.

A RIDGE ON THE NORTHERN STREAM LIES OVER THE EASTERN PACIFIC...
CENTERING ON TWO 1025 HPA HIGHS...WITH ONE AT 33S 101W AND THE
OTHER AT 41S 87W. A BROAD POLAR TROUGH LIES TO THE SOUTH...WITH A
FRONT EXTENDING ALONG A 992 HPA LOW AT 59S 86W...52S 89W...A 1006
HPA LOW AT 50S 96W...38S 103W...AND 33S 102W. BROAD TROUGH OVER
THE WESTERN SOUTH ATLANTIC CENTERS ON AN OCCLUDED 962 HPA LOW AT
64S 38W. A POLAR FRONT TO THE NORTH EXTENDS FROM AN OCCLUDED 976
HPA LOW AT 50S 44W...A 974 HPA LOW AT 51S 41W...41S 52W...LA
PAMPA/NORTHERN PATAGONIA IN ARGENTINA. AN ELONGATED FRONT TO THE
EAST AND NORTH EXTENDS ALONG A 1002 HPA LOW AT 41S 16W...33S
28W...29S 70W... SOUTHERN URUGUAY TO CORDOBA IN ARGENTINA.
SCATTERED DEEP CONVECTION WAS BUILDING TO THE NORTH INTO SOUTHERN
STATES OF BRASIL.

ARREAGA...INAMHI (ECUADOR)
SCHNEIDER...INMET (BRASIL)
DAVISON...WPC (USA)





Last Updated: 940 AM EST FRI FEB 27 2015