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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1346Z Oct 14, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
947 AM EDT TUE OCT 14 2014

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

SYNOPSIS (VALID FROM OCTOBER 14 AT 00UTC): AT 200 HPA...A NORTH TO
SOUTH RIDGE EXTENDS OVER THE CONTINENT ALONG 70W TO SOUTHERN
CHILE. EAST OF THIS AXIS...A SHORT WAVE TROUGH IS LIFTING ACROSS
SOUTHEAST-CENTRAL BRASIL...WHILE ANOTHER MEANDERS TO THE NORTH
ALONG 53W. IN THIS PATTERN...MOST ACTIVE CONVECTION IS BUILDING
ACROSS PARA-AMAZONAS IN BRASIL TO SOUTHERN VENEZUELA/EASTERN
COLOMBIA. OTHER ACTIVITY WAS DOTTING THE SOUTHERN SIERRA OF PERU
AND THE ALTIPLANO OF BOLIVIA.

AT 250 HPA...THE SOUTHERN POLAR HAS ITS ENTRANCE AT 56S
106W...ALONG 60S 94W...61S 79W...53S 68W...44S 56W...45S
39W...EXITING AT 48S 24W. THE NORTHERN POLAR HAS ITS ENTRANCE AT
37S 115W...THEN ALONG 31S 108W...21S 99W...A 136KT MAXIMUM AT 32S
90W...A 140KT MAXIMUM AT 40S 82W...40S 72W...A 163KT MAXIMUM AT
38S 63W...38S 50W...40S 33W...40S 21W...A 146KT MAXIMUM AT 44S
09W...AND 41S 01W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT 21S
98W...ALONG 27S 88W...33S 77W...A 128KT MAXIMUM AT 32S 58W...31S
49W...A 143KT MAXIMUM AT 34S 40W...36S 52W...36S 05W...AND 31S 01W.

AT 500 HPA...IN A SPLIT FLOW PATTERN...A RIDGE ON THE SOUTHERN
STREAM EXTENDS FROM 50S 98W TO THE BELLINGSHAUSEN SEA...WHILE A
TROUGH TO THE NORTH EXTENDS FROM A CLOSED LOW AT 39S 97W TO 20S
105W. A RIDGE EXTENDS ALONG THE ANDES FROM NORTHERN CHILE TO
PATAGONIA IN ARGENTINA. DOWNSTREAM FROM THESE SYSTEMS...A BROAD
TROUGH NOW EXTENDS BETWEEN 65W-40W TO 35S...ANCHORING ON A CLOSED
LOW AT 61S 55W.

AT LOW LEVELS...A BROAD TROUGH DOMINATES FLOW OVER THE SOUTH
ATLANTIC BETWEEN PATAGONIA IN ARGENTINA AND 25W...WHILE ANCHORING
ON AN OCCLUDED 962 HPA LOW AT 61S 51W. POLAR FRONTS REVOLVE AROUND
THIS AXIS...WITH ONE THAT EXTENDS ALONG A 986 HPA LOW AT 52S
34W...50S 31W...46S 33W...A 998 HPA LOW AT 45S 38W...41S 38W...39S
42W...36S 53W...LA PAMPA IN ARGENTINA...TEMUCO...43S 77W...45S
83W...A 1012 HPA LOW AT 44S 89W...41S 85W...35S 86W...32S 87W...A
1014 HPA LOW AT 31S 90W...26S 92W...22S 97W...AND 19S 105W. AN
OLD/ELONGATED FRONT TO THE EAST AND NORTH LIES ALONG A 1014 HPA
LOW AT 35S 25W...32S 27W...31S 31W...29S 37W...29S 42W...PARANA IN
SOUTHERN BRASIL-NORTHERN MESOPOTAMIA IN ARGENTINA TO NORTHWEST
ARGENTINA. THIS SUSTAINS SCATTERED DEEP CONVECTION ACROSS SOUTHERN
BRASIL.

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