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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1259Z Sep 17, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
859 AM EDT WED SEP 17 2014

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

SYNOPSIS (VALID FROM SEPTEMBER 17 AT 00UTC): AT 200 HPA...THE
UPPER LEVEL ANALYSIS SHOWS A CELL OF THE SUBTROPICAL RIDGE THAT
ORIGINATES ON A CLOSED HIGH OVER ACRE IN BRASIL. UPPER RIDGE LIES
WEST ALONG 07S INTO THE TROPICAL PACIFIC...AND TO THE SOUTHEAST
ACROSS BOLIVIA TO THE RIO DE LA PLATA BASIN. AN INDUCED TROUGH
LIES TO THE EAST...WITH AXIS NORTH-NORTHWEST ALONG 40S 40W...20S
43W...TO ILHA DE MARAJO. THE RIDGE ALOFT IS VENTING DIURNAL
CONVECTION ACROSS NORTHWEST BRASIL TO PERU-COLOMBIA.

THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG 61S
120W...57S 103W...A 149KT MAXIMUM AT 55S 90W...A 130KT MAXIMUM AT
55S 67W...LAS MALVINAS...50S 50W...EXITING AT 54S 41W. IT HAS A
FINGER TO THE NORTH WITH ENTRANCE AT 51S 105W...ALONG A 132KT
MAXIMUM AT 51S 91W...EXITING AT 46S 79W. THE NORTHERN POLAR LIES
ALONG 35S 120W...44S 102W...45S 94W...41S 48W...EXITING AT 32S
87W. IT REFORMS AT 30S 81W...ALONG 36S 67W...EXITING AT 34S 47W.
THE SUBTROPICAL JET HAS ITS ENTRANCE AT 17S 99W...ALONG 20S
86W...A 129KT MAXIMUM AT 25S 79W...A 128KT MAXIMUM AT 28S
70W...28S 57W...EXITING AT 23S 48W.

AT MID LEVELS...A RIDGE EXTENDS FROM A CLOSED HIGH AT 19S
117W...ALONG 35S 100W...TO 43S 95W. A SHORT WAVE TROUGH LIES TO
THE EAST...EXTENDING FROM A LOW AT 34S 79W...ALONG 25S 85W...TO
20S 90W. FARTHER SOUTH...LOW AMPLITUDE TROUGH ON THE SOUTHERN
STREAM EXTENDS FROM THE BELLINGSHAUSEN SEA TO TIERRA DEL
FUEGO/SOUTHERN PATAGONIA...WHILE CENTERING ON A CLOSED LOW AT 66S
77W. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS SOUTHERN PORTIONS
OF CHILE INTO PATAGONIA. EMBEDDED IN THIS FLOW...A SHORT WAVE
TROUGH IS MOVING TOWARDS THE SOUTHERN CONE AS ANOTHER PULLS ACROSS
50W. FARTHER NORTH...OVER THE WESTERN ATLANTIC...A SHORT WAVE
TROUGH EXTENDS ALONG 40W TO 24S.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM CENTERS ON A 1029
HPA HIGH AT 31S 100W. SOUTH OF THIS AXIS...A LOW AMPLITUDE TROUGH
EXTENDS ACROSS THE BELLINGSHAUSEN SEA TO THE SOUTHERN CONE...
CENTERING ON A 952 HPA LOW AT 66S 75W. POLAR FRONTS REVOLVE AROUND
THIS AXIS...WITH ONE THAT EXTENDS FROM AN OCCLUDED 962 HPA LOW AT
59S 76W...A 968 HPA LOW AT 58S 72W...56S 73W...55S 77W...A 988 HPA
LOW AT 55S 80W...53S 84W...54S 90W...TO A 992 HPA LOW AT 56S 95W.
THIS SUSTAINS SCATTERED RAINFALL ACROSS SOUTHERN PORTIONS OF
CHILE. ALSO OVER THE ATLANTIC...A TROUGH ON THE NORTHERN STREAM
CENTERS ON AN OCCLUDED 1002 HPA LOW AT 37S 37W. THIS EXTENDS A
POLAR FRONT FROM AN OCCLUDED 1008 HPA LOW AT 43S 30W...A 1010 HPA
LOW AT 43S 26W... 39S 28W...36S 33W...A 1006 HPA LOW AT 35S
35W...29S 35W...RIO DE JANEIRO...MINAS GERAIS-MATO GROSSO TO
CENTRAL BOLIVIA. A RIDGE TO THE SOUTH CENTERS ON A 1021 HPA HIGH
AT 34S 53W.

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