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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1325Z Oct 07, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
925 AM EDT TUE OCT 07 2014

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

SYNOPSIS (VALID FROM OCTOBER 07 AT 00UTC): AT 200 HPA...THE
SUBTROPICAL RIDGE WAS BUILDING OVER WESTERN AMAZONAS IN
BRASIL...WHILE THE CAVADO DO NORDESTE EXTENDED ACROSS
SERGIPE/PERNAMBUCO INTO CEARA AND JUST OFF THE COAST OF PARA. THE
RIDGE WAS VENTILATING CONVECTION ACROSS MOST OF THE WESTERN AMAZON
BASIN...WHERE SCATTERED SHOWERS AND THUNDERSTORMS WERE OCCURRING.
ANOTHER TROUGH EXTENDED FROM RIO GRANDE DO SUL ACROSS PARAGUAY.
THIS ONE WAS VENTILATING WEAKENING CONVECTION ACROSS SOUTHERN
BRASIL.

AT 250 HPA...THE SOUTHERN POLAR JET FORMING AT 43S 88W ALONG 46S
78W...A 129KT MAXIMA AT 53S 63W...58S 53W...A 154KT MAXIMA AT 61S
37W...61S 21W. THE NORTHERN POLAR JET FORMED AT 30S 98W ALONG 33S
89W...38S 78W...50S 59W...EXITING AT 54S 33W. THE SUBTROPICAL JET
EXTENDED ALONG 19S 104W...23S 96W...29S 83W...EXITING AT 33S 69W.
ANOTHER BRANCH FORMED AT 25S 64W EXITING AT 22S 54W.

AT 500 HPA...THE MID LEVEL ANALYSIS SHOWS A LONG WAVE TROUGH
APPROACHING THE SOUTHERN CONE WHILE EXTENDING FROM A LOW AT 65S
75W...48S 90W...25S 112W. THIS TROUGH WAS FOCUSING ITS ENERGY
ACROSS SOUTHERN CHILE/SOUTHERN PATAGONIA. IT WAS ALSO LEADING TO
WEST-NORTHWESTERLIES ACROSS MOST OF THE SOUTHERN CONE. A SHORT
WAVE TROUGH CENTERED OFF THE COAST OF THE BUENOS AIRES PROVINCE
EXTENDING INTO EASTERN RIO GRANDE DO SUL. THIS TROUGH WAS FOCUSING
PART OF ITS CYCLONIC VORTICITY OVER SANTA CATARINA. A RIDGE
EXTENDED FROM RIO DO JANEIRO INTO 32S 42W...48S 35W.

AT LOW LEVELS...A 1014 HPA OCCLUDED LOW AT 47S 88W EXTENDED A
FRONT INTO A 1014 HPA LOW AT 48S 83W...46S 80W...43S 82W. A 998
HPA LOW AT 56S 55W EXTENDED A FRONT ALONG 51S 56W...48S 61W...A
1010 HPA LOW AT 46S 67W...44S 68W...40S 72W...35S 80W. A 1010 HPA
LOW AT 41S 56W EXTENDED A FRONT ALONG 42S 53W...41S 53W...A 1014
HPA LOW AT 39S 52W...36S 52W...NORTHERN URUGUAY...CENTRAL
PARAGUAY. SHOWERS AND THUNDERSTORMS WERE OCCURRING ACROSS EASTERN
PARAGUAY. A 1022 HPA LOW AT 23S 22W EXTENDED A FRONT ALONG 20S
22W...16S 25W...11S 29W...SOUTHERN PERNAMBUCO IN BRASIL.

CAROCA...DMC (CHILE)
DURAN...SENAMHI (PERU)
GALVEZ...WPC (USA)