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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1430Z Feb 13, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
930 AM EST FRI FEB 13 2015

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

SYNOPSIS (VALID FROM FEBRUARY 13 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS THE SUBTROPICAL RIDGE WITH AXIS WEST-TO-EAST ACROSS THE
CONTINENT ALONG 25S...AND CENTERING ON A CLOSED HIGH NEAR 23S 68W.
A TROUGH TO THE NORTH EXTENDS ALONG 20S 30W...A LOW AT 13S
45W...TO PARA. THE RIDGE ALOFT IS VENTING DEEP CONVECTION ACROSS
RONDONIA-ACRE-AMAZONAS IN BRASIL TO PERU-SOUTHERN COLOMBIA AND
EASTERN ECUADOR. THE TROUGH...MEANWHILE...VENTING DEEP CONVECTION
ACROSS BRASIL TO THE NORTH OF 10S AND EAST OF 55W.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH
ENTRANCE AT 56S 116W...THEN ALONG A 135KT MAXIMUM AT 64S 108W...A
122KT MAXIMUM AT 68S 90W...65S 73W...EXITING AT 60S 65W. IT
REFORMS AT 48S 48W...THEN ALONG A 146KT MAXIMUM AT 52S
37W...EXITING AT 56S 25W. THE NORTHERN POLAR HAS ITS ENTRANCE AT
52S 111W...THEN ALONG 64S 96W...54S 69W...EXITING AT 44S 55W. IT
REFORMS AT 41S 51W...ALONG 48S 37W...51S 20W...AND 49S 02W. THE
SUBTROPICAL JET HAS ITS ENTRANCE AT 44S 101W...THEN ALONG 49S
89W...EXITING AT 43S 74W. THE JET REFORMS AT 29S 65W...ALONG 31S
56W...37S 38W...42S 27W...EXITING AT 44S 15W.

THE SURFACE ANALYSIS SHOWS A LONG WAVE RIDGE OVER THE FAR EASTERN
PACIFIC...WITH AXIS NORTH-TO-SOUTH ALONG 85W TO THE BELLINGSHAUSEN
SEA. A LONG WAVE TROUGH TO THE EAST BOUNDS BETWEEN 65W-30W TO
30S...WITH SHORT WAVE ENERGY FOCUSING OVER RIO DE LA PLATA BASIN.
A RIDGE TO THE NORTH EXTENDS WEST FROM A CLOSED HIGH AT 28S
29W...TO SOUTHEAST BRASIL...WHERE IT SUSTAINS A SUBSIDENCE CAP
INVERSION.

AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A RIDGE OVER THE FAR
EASTERN PACIFIC THAT CENTERS ON TWO 1025 HPA HIGHS...WITH ONE AT
40S 85W AND THE OTHER AT 47S 76W. A BROAD TROUGH LIES TO THE
EAST...ANCHORING ON A 978 HPA LOW AT 61S 42W. A POLAR FRONT
REVOLVES AROUND THIS AXIS...AS IT EXTENDS ALONG A 992 HPA LOW AT
53S 33W...48S 36W...A 998 HPA LOW AT 45S 42W...39S
47W...URUGUAY-CORDOBA IN ARGENTINA TO CENTRAL CHILE. A POLAR RIDGE
TO THE SOUTH CENTERS ON A 1021 HPA HIGH AT 39S 63W. AN OLD POLAR
FRONT TO THE NORTH LIES ALONG A 1006 HPA LOW AT 40S 38W...34S
39W...30S 43W...PARANA TO SOUTHEAST PARAGUAY. ORGANIZED DEEP
CONVECTION CLUSTERS ALONG A TROUGH TO THE NORTH...EXPANDING FROM
PARAGUAY TO SAO PAULO.

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