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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1448Z Feb 12, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
948 AM EST THU FEB 12 2015

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

SYNOPSIS (VALID FROM FEBRUARY 12 AT 00UTC): AT 200 HPA...THE
BOLIVIAN HIGH NOW CENTERS NEAR 23S 57W...WITH ASSOCIATED RIDGE
EXTENDING OVER THE CONTINENT TO THE NORTH OF 30S AND WEST OF 50W.
THIS IS VENTING DEEP CONVECTION ACROSS PERU-BOLIVIA-WESTERN BRASIL
AND MATO GROSSO/MATO GROSSO DO SUL. A TUTT LOW TO THE EAST CENTERS
OFF THE COAST OF BRASIL NEAR 13S 35W. THIS LOW EXTENDS A TROUGH TO
NORTHEAST BRASIL...WHERE IT CONTINUES TO ENHANCE CONVECTION ALONG
THE COAST TO THE EAST OF ILHA DE MARAJO.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
65S 119W...67S 103W...EXITING AT 65S 89W. IT REFORMS AT 62S
77W...THEN ALONG A 123KT MAXIMUM AT 55S 72W...EXITING AT 53S 70W.
THE NORTHERN POLAR LIES ALONG 57S 120W...A 134KT MAXIMUM AT 61S
90W...57S 79W...EXITING AT 50S 76W. IT REFORMS AT 47S 69W...ALONG
46S 57W...49S 33W...49S 25W...EXITING AT 56S 09W. THE SUBTROPICAL
JET HAS ITS ENTRANCE AT 46S 85W...ALONG 42S 75W...42S 52W...44S
26W...AND 51S 06W. IT HAS A BRANCH TO THE NORTH WITH ENTRANCE AT
28S 80W...ALONG 32S 65W...EXITING AT 33S 50W. THE JET REFORMS AT
36S 44W...ALONG 38S 40W...EXITING AT 38S 33W.

AT 500 HPA...A RIDGE EXTENDS TO THE SOUTHEAST ALONG 37S 87W...50S
90W...65S 70W...TO THE ANTARCTIC PENINSULA. EAST OF THIS AXIS...A
TROUGH NOW EXTENDS BETWEEN 75W-40W TO 35S. THIS IS FOCUSING SHORT
WAVE ENERGY ACROSS SOUTHERN CHILE TO PATAGONIA IN ARGENTINA. OTHER
SHORT WAVE PERTURBATIONS LIE TO THE NORTH...WITH ONE MEANDERING
OFF THE COAST OF CHILE NEAR 31S 79W...WHILE ANOTHER IS PULLING
ACROSS RIO GRANDE DO SUL IN BRASIL.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM LIE OVER THE
EASTERN PACIFIC...CENTERING ON A 1025 HPA HIGH AT 39S 93W. EAST OF
THIS AXIS...A TROUGH EXTENDS ACROSS THE DRAKE PASSAGE TO THE
SOUTHERN CONE. POLAR FRONT REVOLVING AROUND THIS AXIS EXTENDS
ALONG A 992 HPA LOW AT 50S 46W...45S 48W...42S 56W...A 998 HPA LOW
AT 41S 62W...37S 69W...AND 42S 82W. ANOTHER FRONT TO THE EAST AND
NORTH EXTENDS ALONG A 1012 HPA LOW AT 42S 24W...37S 29W...34S
36W...31S 47W...RIO GRANDE DO SUL TO NORTHERN ARGENTINA. SCATTERED
DEEP CONVECTION IS BUILDING TO THE NORTH ACROSS PARAGUAY TO
SOUTHERN BRASIL.

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