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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1321Z Aug 26, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
921 AM EDT TUE AUG 26 2014

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

SYNOPSIS (VALID FROM AUGUST 26 AT 00UTC): AT 200 HPA...AN
UNUSUALLY STRONG CELL OF THE SUBTROPICAL RIDGE DOMINATES THE
EASTERN PACIFIC AND WESTERN PORTIONS OF SOUTH AMERICA. THE RIDGE
ANCHORS ON A CLOSED HIGH OVER ACRE IN BRASIL/CENTRAL PERU...WITH
AXIS WEST INTO THE EASTERN TROPICAL PACIFIC AND SOUTH ALONG 75W TO
SOUTHERN CHILE. THE RIDGE ALOFT IS VENTING ISOLATED CONVECTION
ACROSS PORTIONS OF PARA-AMAZONAS IN BRASIL...WITH MOST INTENSE
NORTH OF THE EQUATOR OVER VENEZUELA AND COLOMBIA. EAST OF THE
RIDGE...A TROUGH EXTENDS ALONG THE COAST OF ARGENTINA TO SOUTHERN
BRASIL. THIS IS INTERACTING WITH A SHORT WAVE TROUGH TO THE NORTH
AS THE LATTER EXTENDS ALONG 15S 46W TO THE GUIANAS.

AT 250 HPA...THE SOUTHERN POLAR HAS A FINGER WITH ENTRANCE AT 44S
88W...THEN ALONG 52S 80W...EXITING AT 47S 66W. IT REFORMS AT 48S
48W...ALONG 48S 33W...40S 13W...AND 38S 02W. THE NORTHERN POLAR
HAS ITS ENTRANCE AT 23S 96W...ALONG A 140KT MAXIMUM AT 27S
85W...EXITING AT 33S 79W. IT REFORMS AT 34S 70W...THEN ALONG A
150KT MAXIMUM AT 32S 65W...30S 57W...34S 50W...43S 48W...43S
32W...A 134KT MAXIMUM AT 37S 17W...AND A 130KT MAXIMUM AT 33S 05W.
THE SUBTROPICAL JET HAS ITS ENTRANCE AT 16S 105W...ALONG 17S
97W...20S 90W...26S 73W... EXITING AT 18S 55W. IT REFORMS BETWEEN
22S 46W AND 29S 39W. THE SUBTROPICAL JET REFORMS AT 32S 27W...THEN
ALONG 30S 15W...29S 09W...AND 32S 06E.

AT 500 HPA...MID LEVEL ANALYSIS SHOWS A CLOSED LOW NEAR 53S 93W
EXTENDING A TROUGH ALONG 40S 95W TO 30S 97W. THIS IS PHASING WITH
A SHORT WAVE TROUGH TO THE NORTH THAT CENTERS ON A LOW AT 24S 97W.
FARTHER EAST...A NORTH TO SOUTH RIDGE EXTENDS FROM SOUTHERN
PERU...ALONG 30S 75W...50S 76W...TO 60S 75W. EAST OF THIS AXIS...A
DEEP LOW NEAR 37S 57W ANCHORS A TROUGH OVER MID SECTIONS OF SOUTH
AMERICA WHILE FOCUSING SHORT WAVE ENERGY ACROSS URUGUAY-SOUTHERN
STATES OF BRASIL. A SHORT WAVE RIDGE TO THE EAST EXTENDS ALONG
38W/40W TO 45S.

SOUTH OVER THE CONTINENT...AT LOW LEVELS...A POLAR RIDGE ENVELOPS
THE SOUTHERN CONE AS IT CENTERS ON A 1029 HPA HIGH AT 43S 67W.
EAST OF THIS AXIS...A BROAD TROUGH DOMINATES THE WESTERN
ATLANTIC/MID SECTIONS OF SOUTH AMERICA...AS IT CENTERS ON AN
OCCLUDED 994 HPA LOW AT 36S 56W. THIS EXTENDS A FRONT ALONG 34S
59W...42S 57W...A 1004 HPA LOW AT 38S 46W...34S 44W...29S 46W...A
1006 HPA LOW AT 26S 48W...MATO GROSSO-RONDONIA IN BRASIL TO
NORTHERN BOLIVIA. THIS SUSTAINS SCATTERED DEEP CONVECTION ACROSS
THE SOUTHERN STATES OF BRASIL.

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