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South American Synoptic Discussion
 
(Latest Discussion - Issued 1315Z Aug 27, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
915 AM EDT WED AUG 27 2014

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

SYNOPSIS (VALID FROM AUGUST 27 AT 00UTC): NORTH OVER THE
CONTINENT...AT 200 HPA...AN UNUSUALLY STRONG CELL OF THE
SUBTROPICAL RIDGE DOMINATES CONTINENTAL AREA TO THE NORTH OF 30S
AND WEST OF 50W...WHILE CENTERING ON A CLOSED HIGH OVER RONDONIA
IN BRASIL. THIS IS VENTING ORGANIZED DEEP CONVECTION ACROSS
AMAZONAS-ACRE IN BRASIL TO SOUTHERN COLOMBIA AND THE PERUVIAN
JUNGLE. EAST OF THIS RIDGE...A TROUGH EXTENDS ALONG 30S 43W...20S
40W...10S 45W...TO THE GUIANAS. THIS FAVORS WIDELY ISOLATED
CONVECTION ACROSS ILHA DE MARAJO AND NORTHERN PARA IN BRASIL.

THE 250 HPA JET ANALYSIS SHOWS A SMALL BRANCH OF THE SOUTHERN
POLAR JET FORMING AT 51S 79W AND EXITING AT 56S 74W. IT REFORMS AT
50S 64W...EXITING AT 44S 61W. THE NORTHERN POLAR EXTENDS ALONG A
160KT MAXIMA AT 38S 120W...34S 110W...A 135KT MAXIMA AT 30S
100W...EXITING AT 27S 89W. IT REFORMS AT 27S 84W EXITING AT 33S
73W. IT REFORMS AT 36S 62W ALONG A 144KT MAXIMA AT 31S 53W...31S
46W...34S 40W...46S 34W. THE SUBTROPICAL JET FORMS AT 17S 93W
ALONG A 139KT MAXIMA AT 24S 80W...A 141KT MAXIMA AT 27S 70W...28S
54W...EXITING AT 19S 43W. IT REFORMS AT 19S 37W EXITING AT 25S 31W.

AT 500 HPA...A BROAD TROUGH DOMINATES FLOW ACROSS THE FAR EASTERN
PACIFIC...ENVELOPING AREA BETWEEN 105W-75W AND TO THE SOUTH OF
15S. SHORT WAVE PERTURBATIONS EMBED IN THIS AXIS...WITH ONE
LIFTING ACROSS 100W TO 27S. ANOTHER EXTENDS ALONG 33S 83W...TO 17S
83W. A LONG WAVE RIDGE LIES TO THE EAST...WITH AXIS NORTH-TO-SOUTH
ALONG 70W TO THE DRAKE PASSAGE. DOWNSTREAM FROM THIS RIDGE...BROAD
TROUGH ON THE NORTHERN STREAM EXTENDS BETWEEN 60W-35W AND TO THE
SOUTH OF 20S...WITH AXIS CENTERING ON A CLOSED LOW AT 41S 46W. AN
INDUCED RIDGE TO THE EAST EXTENDS ALONG 23S 23W...40S 30W...TO 50S
35W.

THE SURFACE ANALYSIS SHOWS AN OCCLUDED LOW OF 996 HPA AT 59S 85W
EXTENDING A 1002 HPA LOW AT 59S 77W...55S 73W...49S 79W...48S
83W...A 1006 HPA LOW AT 44S 88W...38S 87W. RAINFALL WAS OCCURRING
IN PARTS OF EXTREME SOUTHERN CHILE. A 1025 HPA HIGH CENTERED AT
33S 64W...RIDGING INTO A 1021 HPA HIGH AT 47S 64W.  A 1014 HPA LOW
CENTERED AT 37S 75W. A 990 HPA OCCLUDED LOW AT 40S 46W EXTENDED A
FRONT INTO A 1000 HPA LOW AT 43S 36W...A 1006 HPA LOW AT 35S
37W...26S 41W...RIO DO JANEIRO...20S 45W...A 1010 HPA LOW AT 16S
54W...SOUTHERN RONDONIA...SOUTHEASTERN PERU. ISOLATED
THUNDERSTORMS WERE OCCURRING NEAR SAO PAULO...AND OVER
ACRE/AMAZONAS IN BRASIL.

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