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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1441Z Nov 10, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
941 AM EST MON NOV 10 2014

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

SYNOPSIS (VALID FROM NOVEMBER 10 AT 00UTC): AT UPPER LEVELS...THE
SUBTROPICAL CENTERS OVER NORTHERN BOLIVIA. THIS IS LEADING TO
AREAS OF UPPER DIVERGENCE IN IS PERIPHERY...WHICH ARE VENTILATING
CONVECTION ACROSS A CORRIDOR THAT EXTENDS FROM NORTHERN MINAS
GERAIS /GOIAS/TOCANTINS INTO MOST OF SOUTHERN AND CENTRAL
AMAZONIA. ENHANCED EASTERLY FLOW AT LOW-LEVELS...COUPLED WITH A
REGION OF ENHANCED CONVECTIVE INSTABILITY...ARE LEADING TO
SCATTERED STRONG CONVECTION ACROSS THE BOLIVIAN LOWLANDS.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR EXTENDING
ALONG  54S 120W...A 133KR MAXIMA AT 50S 100W...50S 83W...57S
62W...A 151KT MAXIMA AT 54S 53W...EXITING AT 47S 47W. THE NORTHERN
POLAR EXTENDS FORMS AT 48S 120W ALONG 47S 103W...47S 82W...53S
61W...40S 48W...39S 37W...44S 21W...EXITING AT 51S 05W. ANOTHER
BRANCH FORMS AT 40S 117W ALONG A 124KT MAXIMA AT 41S 106W...39S
96W...EXITING AT 40S 86W. THE SUBTROPICAL JET FORMS AT 34S 123W
ALONG 37S 112W...37S 103W...EXITING AT 33S 96W. IT REFORMS AT 25S
86W...31S 73W...28S 56W...24S 45W...29S 33W...A 133KT MAXIMA AT
36S 26W...EXITING AT 45S 12W.

AT 500 HPA...A TROUGH EXTENDS OFF THE COAST OF CHILE ALONG
80W...WHILE A RIDGE EXTENDS ACROSS MOST OF ARGENTINA ALONG 62-64W
INTO THE MALVINAS/FALKLANDS. TO THE EAST...A WELL DEFINED BROAD
TROUGH EXTENDS FROM THE GEORGIA ISLANDS INTO RIO DO JANEIRO IN
BRASIL...AND THEN INTO CENTRAL BAHIA. THIS TROUGH IS ENHANCING
ACTIVITY ACROSS ESPIRITO SANTO/SOUTHERN BAHIA IN BRASIL.

AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A 962 HPA OCCLUDED LOW
AT 57S 78W EXTENDING A FRONT ALONG A 992 HPA LOW AT 51S 69W...49S
69W...48S 73W...A 1008 HPA LOW AT 47S 77W...44S 76W...42S 80W. A
1014 HPA LOW AT 24S 37W EXTENDS A FRONT ALONG 21S 36W...CENTRAL
ESPIRITO SANTO IN BRASIL...AND A WEAK FRONT ACROSS MINAS GERAIS IN
BRASIL. STRONG SHOWERS AND THUNDERSTORMS ARE OCCURRING AHEAD AND
NEAR THE FRONT

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