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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1322Z Aug 13, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
922 AM EDT WED AUG 13 2014

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

SYNOPSIS (VALID FROM AUGUST 12 AT 00UTC): A 200 HPA HIGH OVER THE
TROPICAL ATLANTIC NEAR 08S 28W EXTENDS A RIDGE TO THE WEST INTO
THE NORTHEAST STATES OF BRASIL. THIS THEN MERGES WITH AN ILL
ORGANIZED RIDGE OVER EQUATORIAL SOUTH AMERICA. THE RIDGE ALOFT IS
VENTING SCATTERED DEEP CONVECTION ACROSS RORAIMA IN
BRASIL-SOUTHERN VENEZUELA TO EASTERN COLOMBIA.

AT 250 HPA...THE SOUTHERN POLAR HAS ITS ENTRANCE AT 54S
103W...WITH AXIS ALONG A 133KT MAXIMUM AT 54S 80W...SOUTHERN
PATAGONIA...EXITING AT 40S 59W. THE JET REFORMS AT 38S 54W...ALONG
44S 38W...47S 27W...A 159KT MAXIMUM AT 46S 13W...AND 47S 01W. THE
NORTHERN POLAR HAS ITS ENTRANCE AT 40S 77W...ALONG 34S 69W...35S
54W...38S 40W...41S 30W...A 135KT MAXIMUM AT 44S 20W...EXITING AT
40S 05W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT 27S 94W...ALONG
32S 85W...28S 71W...28S 56W...A 146KT MAXIMUM AT 33S 39W...35S
21W...EXITING AT 27S 08W. IT HAS A FINGER TO THE NORTH WITH
ENTRANCE AT 25S 40W...CROSSING 27S 32W...EXITING AT 29S 25W.

AT 500 HPA...A TROUGH ON THE NORTHERN STREAM IS INITIALIZED ALONG
100W/103W TO 20S...WITH A RIDGE TO THE EAST EXTENDING NORTH TO
SOUTH ALONG 85W TO 54S. SOUTHERN STREAM SHORT WAVE PERTURBATIONS
FLOW TO THE SOUTH...STREAMING TOWARDS THE DRAKE PASSAGE/TIERRA DEL
FUEGO. A HIGH AMPLITUDE TROUGH OVER THE WESTERN SOUTH ATLANTIC
EXTENDS TO THE NORTHWEST FROM A LOW AT 53S 49W...ALONG 40S
55W...RIO DE LA PLATA BASIN TO NORTHWEST PROVINCES IN ARGENTINA.
THIS TROUGH IS FOCUSING SHORT WAVE ENERGY ACROSS CENTRAL/NORTHERN
ARGENTINA-URUGUAY-SOUTHERN BRASIL.

AT LOW LEVELS...A BROAD RIDGE OVER THE FAR EASTERN PACIFIC CENTERS
ON A 1037 HPA HIGH AT 70S 48W. SOUTH OF THIS AXIS...A PROGRESSIVE
FRONT ON THE SOUTHERN STREAM EXTENDS FROM AN OCCLUDED 978 HPA LOW
AT 58S 68W...A 980 HPA LOW AT 57S 68W... SOUTHERN PATAGONIA...52S
75W...54S 86W...TO A 1006 HPA LOW AT 56S 94W. THIS SUSTAINS
SCATTERED RAINFALL ACROSS EXTREME SOUTHERN CHILE/TIERRA DEL FUEGO.
EAST OVER THE ATLANTIC...AN OCCLUDED 978 HPA LOW AT 53S 49W
EXTENDS A FRONT ALONG A 982 HPA LOW AT 53S 44W...46S 43W...A 996
HPA LOW AT 43S 46W...33S 50W...RIO GRANDE DO SUL-SANTA FE/CORDOBA
TO SAN JUAN IN ARGENTINA. A BUILDING POLAR RIDGE TO THE SOUTH
CENTERS ON A 1029 HPA HIGH AT 34S 65W. THIS IS INTERACTING WITH AN
OLD FRONT TO THE NORTH THAT EXTENDS ALONG A 1010 HPA LOW AT 38S
26W...34S 30W...34S 35W...A 1010 HPA LOW AT 36S 39W...32S 41W...A
1014 HPA LOW AT 31S 44W...PARANA-MATO GROSSO DO SUL/PARAGUAY TO
NORTHERN BOLIVIA/ SOUTHERN PERU. THIS SUSTAINS SCATTERED DEEP
CONVECTION.

CAROCA...DMC (CHILE)
JALFIN...SMN (ARGENTINA)
GALVEZ...WPC (USA)
DAVISON...WPC (USA)