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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1331Z Nov 24, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
831 AM EST MON NOV 24 2014

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

SYNOPSIS (VALID FROM NOVEMBER 24 AT 00UTC): AT 200 HPA...THE
SUBTROPICAL RIDGE REMAINS WELL ENTRENCHED OVER NORTHERN SOUTH
AMERICA...ENVELOPING AREA TO THE NORTH OF 30S WHILE ANCHORING ON A
CLOSE HIGH NEAR 15S 53W. A TROUGH LIES TO THE EAST OF THIS
AXIS...EXTENDING ALONG 20S 25W...10S 30W...02N 40W...TO THE
NORTHERN GUIANAS. THE RIDGE ALOFT IS VENTING DEEP CONVECTION
ACROSS SOUTHEAST-CENTRAL BRASIL-NORTHERN BOLIVIA-PERU/ACRE IN
BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
63S 76W...ALONG 56S 70W...EXITING AT 51S 64W. IT HAS A FINGER TO
THE NORTH WITH ENTRANCE AT 54S 99W...ALONG 55S 86W...51S
73W...EXITING AT 46S 70W. THE NORTHERN POLAR HAS ITS ENTRANCE AT
36S 84W...ALONG A 126KT MAXIMUM AT 38S 71W...A 128KT MAXIMUM AT
41S 60W...EXITING AT 39S 48W. THE SUBTROPICAL JET TO THE NORTH HAS
ITS ENTRANCE AT 23S 66W...ALONG 26S 58W...27S 48W...EXITING AT 28S
38W.

AT 500 HPA...A RIDGE OVER THE EASTERN PACIFIC EXTENDS BETWEEN
103W-85W AND TO THE NORTH OF 50S. IN A TIGHT BELT OF MID LATITUDE
WESTERLIES...PROGRESSIVE SHORT WAVE PERTURBATIONS ARE STREAMING
JUST SOUTH OF THIS RIDGE...WITH ONE ALONG 100W/103W TO 50S. A
HIGHER AMPLITUDE TROUGH LIES TO THE EAST...EXTENDING FROM THE
DRAKE PASSAGE/TIERRA DEL FUEGO...ACROSS PATAGONIA...TEMUCO
CHILE...TO 33S 85W. A RIDGE TO THE EAST EXTENDS FROM
URUGUAY...ALONG 40S 53W...TO 50S 45W. A SHORT WAVE TROUGH TO THE
EAST EXTENDS FROM 50S 35W...ALONG 35S 35W...TO 30S 40W.

AT LOW LEVELS...SURFACE ANALYSIS SHOWS A BROAD RIDGE OVER THE FAR
EASTERN PACIFIC THAT CENTERS ON A 1029 HPA HIGH AT 41S 96W. SOUTH
OF THIS AXIS...A PROGRESSIVE POLAR FRONT ORIGINATES ON AN OCCLUDED
982 HPA LOW AT 61S 72W...ALONG A 982 HPA LOW AT 60S 63W...56S
62W...52S 65W...49S 72W...A 1008 HPA LOW AT 48S 77W...46S 76W...TO
44S 82W. ANOTHER FRONT LIES TO THE EAST...EXTENDING ALONG A 990
HPA LOW AT 52S 56W...50S 53W...48S 53W...A 994 HPA LOW AT 47S
56W...46S 54W...43S 55W...A 1002 HPA LOW AT 41S 61W...38S
59W...35S 64W...33S 71W...AND 31S 80W. THIS SUSTAINS SCATTERED
DEEP CONVECTION ACROSS CENTRAL PROVINCES IN ARGENTINA. AN OCCLUDED
982 HPA LOW AT 44S 34W EXTENDS A FRONT ALONG A 986 HPA LOW AT 49S
31W...45S 26W...38S 26W...34S 30W...29S 34W...A 1014 HPA LOW AT
25S 39W...23S 41W...SAO PAULO TO CIUDAD DEL ESTE IN PARAGUAY.
SCATTERED CONVECTION WAS NOTED TO THE NORTH ACROSS SAO PAULO-RIO
DE JANEIRO AND SOUTHERN MINAS GERAIS. A RIDGE TO THE SOUTH CENTERS
ON A 1019 HPA HIGH AT 29S 42W.

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