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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1259Z Nov 21, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
759 AM EST FRI NOV 21 2014

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

SYNOPSIS (VALID FROM NOVEMBER 21 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS THE SUBTROPICAL RIDGE OVER THE CONTINENT...WITH AXIS
EXTENDING FROM NORTHERN PERU...ACROSS RONDONIA IN BRASIL...SAO
PAULO TO THE WESTERN ATLANTIC NEAR 40S 40W. RIDGE ALOFT IS VENTING
ORGANIZED DEEP CONVECTION ACROSS ACRE-AMAZONAS IN WESTERN BRASIL
INTO SOUTHERN COLOMBIA. SCATTERED CONVECTION TO THE EAST WAS
CLUSTERING OVER CENTRAL PORTIONS OF BRASIL-BOLIVIA AND PARAGUAY.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR EXTENDING ALONG
68S 105W...62S 101W...57S 94W...A 139KT MAXIMA AT 60S 68W...58S
45W...EXITING AT 56S 32W. A FINGER OF THE NORTHERN POLAR JET FORMS
AT 39S 106W EXITING AT 42S 92W. IT REFORMS AT 37S 65W ALONG 41S
53W...43S 40W...A 139KT MAXIMA AT 51S 27W...49S 12W. THE
SUBTROPICAL JET FORMS AT 26S 74W ALONG 30S 61W...EXITING AT 33S
48W.

AT 500 HPA...PROGRESSIVE SHORT WAVE PERTURBATIONS ARE STREAMING ON
THE SOUTHERN STREAM FLOW...WITH ONE THAT EXTENDS FROM 63S
88W...ALONG 53S 100W...TO 45S 115W. THIS TROUGH IS FOCUSING SHORT
WAVE ENERGY ACROSS THE DRAKE PASSAGE-TIERRA DEL FUEGO. A SKEWED
RIDGE LIES TO THE NORTH...WITH AXIS EXTENDING FROM AN ILL
ORGANIZED HIGH NEAR 25S 95W...ALONG 40S 80W... SOUTHERN
CHILE/PATAGONIA TO THE MALVINAS/FALKLAND ISLANDS. AN ELONGATED
TROUGH TO THE EAST EXTENDS FROM THE SOUTH GEORGIA ISLANDS...ALONG
47S 50W...TO NORTHERN PATAGONIA. SHORT WAVE TROUGH ON THE NORTHERN
STREAM NOW EXTENDS ACROSS CHILE-ARGENTINA...AS IT BOUNDS BETWEEN
78W-55W AND TO THE SOUTH OF 25S. THIS TROUGH FOCUSES SHORT WAVE
PERTURBATIONS ACROSS CENTRAL/NORTHERN CHILE TO ARGENTINA...WHERE
IT PROVIDES DYNAMICAL SUPPORT TO ORGANIZED CONVECTION.

THE SURFACE ANALYSIS SHOWS A 970 HPA LOW AT 63S 58W EXTENDING A
FRONT INTO A 970 LOW AT 62S 53W...61S 52W...60S 56W...A 976 HPA
LOW AT 61S 60W...58S 63W...55S 75W...51S 93W. RAINFALL WAS BEING
REPORTED IN TIERRA DEL FUEGO. A 1025 HPA HIGH CENTERS AT 34S 86W.
A 1021 HPA HIGH CENTERS AT 40S 58W. A 1016 HPA LOW AT 38S 45W
EXTENDS A FRONT INTO 33S 47W...SOUTHERN RIO GRANDE DO SUL...CHACO
IN ARGENTINA INTO SOUTHERN SALTA. THUNDERSTORMS WERE OCCURRING
AHEAD AND BEHIND THIS SYSTEM.

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