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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1250Z Sep 16, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
850 AM EDT TUE SEP 16 2014

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

SYNOPSIS (VALID FROM SEPTEMBER 16 AT 00UTC): AT 200 HPA...A WEAK
CELL OF THE SUBEQUATORIAL RIDGE EXTENDS WEST ACROSS THE TROPICAL
ATLANTIC ALONG 00N TO AMAPA/AMAZON DELTA REGION IN BRASIL. A COL
OVER NORTHERN PARA SEPARATES THIS RIDGE FROM ANOTHER THAT EXTENDS
FROM ACRE/AMAZONAS IN WESTERN BRASIL TO THE EASTERN TROPICAL
PACIFIC ALONG 07S 90W TO 05S 110W. A LOW AMPLITUDE TROUGH LIES TO
THE SOUTH AND EAST...WITH AXIS ACROSS SOUTHERN BASIL-MATO GROSSO
TO PARA. SCATTERED DEEP CONVECTION IS BUILDING BETWEEN THESE
SYSTEMS...AFFECTING THE ACRE-RONDONIA AND SOUTHERN AMAZONAS/PARA
IN BRASIL. OTHER ACTIVITY WAS BUILDING ALONG THE ANDES OF PERU.

AT 250 HPA...THE SOUTHERN POLAR LIES ALONG A 147KT MAXIMUM AT 47S
120W...A 140KT MAXIMUM AT 55S 98W...A 137KT MAXIMUM AT 49S 79W...
EXITING AT 52S 57W. IT REFORMS AT 52S 52W...ALONG 49S 46W...49S
35W...EXITING AT 49S 21W. THE NORTHERN POLAR LIES ALONG 44S
120W... 43S 102W...EXITING AT 36S 90W. IT REFORMS AT 33S
85W...ALONG 36S 75W...EXITING AT 39S 63W. IT REFORMS AT 42S
48W...ALONG A 130KT MAXIMUM AT 44S 30W...A 131KT MAXIMUM AT 39S
17W...EXITING AT 30S 05W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
19S 97W...ALONG 24S 89W...A 135KT MAXIMUM AT 30S 80W...A 154KT
MAXIMUM AT 32S 70W...A 123KT MAXIMUM AT 29S 60W...EXITING AT 21S
52W. IT REFORMS AT 27S 48W...ALONG 35S 42W...36S 21W...28S
12W...AND 25S 00W.

AT 500 HPA...A BROAD TROUGH ON THE SOUTHERN STREAM EXTENDS FROM
THE BELLINGSHAUSEN SEA TO THE SOUTHERN CONE OF SOUTH AMERICA WHILE
CENTERING ON A LOW AT 63S 81W. THIS IS FOCUSING SHORT WAVE ENERGY
ACROSS TIERRA DEL FUEGO TO SOUTHERN PATAGONIA. THIS IS PHASING
WITH A SHORT WAVE TROUGH TO THE NORTH...AS THE LATTER EXTENDS FROM
43S 80W...ALONG 35S 885W...TO 20S 98W. A SHORT WAVE RIDGE OVER
ARGENTINA SEPARATES THIS TROUGH FROM ANOTHER OVER THE
ATLANTIC...AS THE LATTER EXTENDS NORTH ALONG 50W TO SOUTHERN
BRASIL.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM IS INITIALIZED OVER
THE EASTERN PACIFIC...CENTERING ON A 1029 HPA HIGH AT 32S 101W. A
POLAR TROUGH LIES TO THE SOUTH...WITH A FRONT EXTENDING FROM AN
OCCLUDED 950 HPA LOW AT 64S 77W...ALONG A 970 HPA TRIPLE POINT LOW
AT 63S 63W...59S 62W...A 980 HPA LOW AT 57S 65W...52S 66W...49S
72W...A 1008 HPA LOW AT 48S 78W...44S 77W...AND 40S 82W. THIS
SUSTAINS SCATTERED RAINFALL ACROSS SOUTHERN CHILE. A POLAR FRONT
ON THE NORTHERN STREAM EXTENDS FROM AN OCCLUDED 1002 HPA LOW AT
34S 47W...ALONG A 1002 HPA LOW AT 36S 46W...33S 44W...29S
44W...25S 47W...A 1014 HPA LOW AT 23S 49W...17S 52W...TO NORTHERN
BOLIVIA. A PREFRONTAL SHEAR LINE EXTENDS FROM THIS BOUNDARY ACROSS
MATO GROSSO TO PARA IN BRASIL...WHERE IT SUSTAINS SCATTERED DEEP
CONVECTION. A POLAR RIDGE TO THE SOUTH CENTERS ON TWO 1019 HPA
HIGHS...WITH ONE OVER CORRIENTES ARGENTINA AND THE OTHER OVER THE
BUENOS AIRES PROVINCE.

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