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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1604Z Sep 02, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1204 PM EDT TUE SEP 02 2014

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

SYNOPSIS (VALID FROM SEPTEMBER 02 AT 00UTC): AT 200 HPA...A RIDGE
EXTENDS WEST ACROSS THE TROPICAL ATLANTIC ALONG 09S 30W...07S
45W...TO NORTHERN PARA/RORAIMA IN BRASIL. WEST OF THIS AXIS...A
TROUGH EXTENDS FROM MENDOZA IN ARGENTINA...ALONG 20S 78W...TO 10S
90W. THIS IS ENHANCING CONVECTIVE DEVELOPMENT ALONG THE SOUTHERN
SIERRA OF PERU AND THE ALTIPLANO OF BOLIVIA. FURTHERMORE...AIR
MASS CONVECTION WAS ALSO BUILDING ACROSS MATO GROSSO-MATO GROSSO
DO SUL IN BRASIL.

AT 250 HPA...THE NORTHERN POLAR LIES ALONG 38S 120W...37S
106W...34S 95W...A 125KT MAXIMUM AT 34S 85W...EXITING AT 33S 69W.
IT REFORMS AT 35S 65W...ALONG 39S 58W...36S 49W...33S
44W...EXITING AT 30S 37W. THE SUBTROPICAL JET LIES ALONG A 127KT
MAXIMUM AT 32S 120W...A 149KT MAXIMUM AT 32S 105W...EXITING AT 26S
92W. IT REFORMS AT 19S 70W...ALONG 26S 58W...A 122KT MAXIMUM AT
26S 40W...25S 29W...26S 18W...AND 27S 07W.

AT 500 HPA...A BROAD TROUGH DOMINATES THE FLOW ACROSS THE FAR
EASTERN PACIFIC. SHORT WAVE PERTURBATIONS EMBEDS IN THIS
FLOW...WITH ONE EXTENDING FROM 40S 95W TO 28S 100W. ANOTHER
EXTENDS FROM A CLOSED LOW AT 47S 85W...ALONG 40S 75W...TO 27S 70W.
A RIDGE TO THE EAST EXTENDS FROM CENTRAL BRASIL...ACROSS
URUGUAY...LAS MALVINAS/ FALKLAND ISLANDS...TO THE WEDDELL SEA.
DOWNSTREAM FROM THIS RIDGE...A BROAD TROUGH EXTENDS BETWEEN
40W-00W AND TO THE SOUTH OF 20S.

AT LOW LEVELS...BROAD TROUGH ON THE NORTHERN STREAM DOMINATES FLOW
ACROSS THE FAR EASTERN PACIFIC. POLAR FRONTS REVOLVE AROUND THIS
AXIS WITH ONE THAT EXTENDS FROM AN OCCLUDED 994 HPA LOW AT 38S
91W...A 1002 HPA LOW AT 36S 86W...32S 86W...A 1010 HPA LOW AT 30S
91W...25S 99W...AND 25S 106W. ANOTHER FRONT EXTENDS FROM AN
OCCLUDED 994 HPA LOW AT 46S 83W...ALONG A 1008 HPA LOW AT 52S
74W...48S 71W...A 1010 HPA LOW AT 45S 70W...41S 64W...36S 65W...TO
31S 70W. PREFRONTAL CONVECTION WAS BUILDING ACROSS CENTRAL
ARGENTINA. A RIDGE OVER THE ATLANTIC CENTERS ON A 1029 HPA HIGH AT
50S 49W. A POLAR FRONT TO THE NORTH EXTENDS ALONG A 1002 HPA LOW
AT 32S 34W...27S 35W...22S 39W... SOUTHERN MINAS
GERAIS...MISIONES/CORRIENTES TO NORTHERN SANTA FE IN ARGENTINA. A
998 HPA THERMAL LOW CENTERS OVER ARGENTINA NEAR 24S 62W.

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