THE WEATHER PREDICTION CENTER

COLLEGE PARK, MD


SOUTH AMERICAN SYNOPSIS




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

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

SYNOPSIS (VALID FROM 24 JULY 00UTC): NORTH OVER THE
CONTINENT...THE 200 HPA ANALYSIS SHOWS A NEAR ZONAL WESTERLY FLOW
ENVELOPING AREA TO THE NORTH OF 20S. IN THIS PATTERN...WIDELY
ISOLATED LATE AFTERNOON CONVECTION WAS BUILDING ACROSS EQUATORIAL
SOUTH AMERICA. SCATTERED SHALLOW CONVECTION...HOWEVER...WAS
CLUSTERING ALONG THE NORTHEAST COAST OF BRASIL AS ENHANCED BY
TRADE WIND CONVERGENCE.

THE JET ANALYSIS AT 250 HPA SHOWS THE SOUTHERN POLAR WITH ENTRANCE
AT 55S 90W...ALONG A 134KT MAXIMUM AT 50S 73W...EXITING AT 39S
66W. IT REFORMS AT 39S 60W...A 135KT MAXIMUM AT 47S 47W...51S
33W...53S 19W...EXITING AT 48S 07W. THE NORTHERN POLAR HAS ITS
ENTRANCE AT 33S 111W...THEN ALONG 42S 100W...43S 88W...37S
75W...25S 68W...24S 63W...RESISTENCIA...CENTRAL URUGUAY...37S
55W....A 164KT MAXIMUM AT 47S 30W...46S 20W...AND 30S 07W. THE
SUBTROPICAL JET HAS ITS ENTRANCE AT 09S 114W...ALONG 11S
110W...21S 96W...24S 81W...A 143KT MAXIMUM AT 22S 68W...20S
53W...16S 51W...EXITING AT 15S 49W.

AT 500 HPA...A LONG WAVE RIDGE OVER THE EASTERN PACIFIC EXTENDS
SOUTH ALONG 90W/95W TO 70S. EAST OF THIS AXIS...A TROUGH ON THE
SOUTHERN STREAM EXTENDS BETWEEN 80W-40W TO 40S. UNDER INFLUENCE OF
THE RIDGE TO THE WEST SHORT WAVE VORTICES ARE LIFTING ACROSS THE
BELLINGSHAUSEN SEA TO TIERRA DEL FUEGO/SOUTHERN CONE OF SOUTH
AMERICA...WITH A STRONG VORTEX NEARING TIERRA DEL FUEGO AS ANOTHER
CLEARS THE COAST OF PATAGONIA. ANOTHER TROUGH LIES TO THE
NORTH...WITH AXIS NORTHWEST FROM THE BUENOS AIRES PROVINCE TO
SOUTHERN BOLIVIA. THIS TROUGH IS FOCUSING SHORT WAVE ENERGY ACROSS
PARAGUAY TO MATO GROSSO/SOUTHERN STATES OF BRASIL...WHERE IT
SUSTAINS ORGANIZED DEEP CONVECTION.

AT LOW LEVELS...BROAD RIDGE ON THE NORTHERN STREAM DOMINATES FLOW
ACROSS THE FAR EASTERN PACIFIC WHILE CENTERING ON A 1033 HPA HIGH
AT 36S 81W. A TROUGH ON THE SOUTHERN STREAM LIES TO THE EAST...
EXTENDING FROM THE WEDDELL SEA TO EASTERN PATAGONIA IN ARGENTINA.
AN OCCLUDED 986 HPA LOW AT 56S 56W ANCHORS THIS AXIS. POLAR FRONTS
REVOLVE AROUND THIS AXIS...WITH ONE THAT EXTENDS FROM AN OCCLUDED
994 HPA LOW AT 52S 59W...ALONG A 990 HPA LOW AT 52S 53W...45S
53W...41S 56W TO NORTHERN PATAGONIA IN ARGENTINA. ANOTHER FRONT
EXTENDS ALONG A 1002 HPA LOW AT 49S 21W...47S 24W...A 1002 HPA LOW
AT 47S 30W...42S 38W...36S 48W...A 1006 HPA LOW AT 31S 51W...RIO
GRANDE DO SUL...PARANA-MATO GROSSO DO SUL/MATO GROSSO TO CENTRAL
BOLIVIA. THIS SUSTAINS ORGANIZED DEEP CONVECTION ACROSS SOUTHERN
BRASIL-PARAGUAY AND EASTERN BOLIVIA. A RIDGE TO THE EAST CENTERS
ON A 1033 HPA HIGH AT 32S 22W.

FERNANDES...INMET (BRASIL)
JALFIN...SMN (ARGENTINA)
DAVISON...WPC (USA)





Last Updated: 907 AM EDT THU JUL 24 2014