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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1304Z Oct 09, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
904 AM EDT THU OCT 09 2014

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

SYNOPSIS (VALID FROM OCTOBER 09 AT 00UTC): AT 200 HPA...A CELL OF
THE SUBTROPICAL RIDGE NOW CONFINES TO PERU/BOLIVIA AS IT CENTERS
ON A CLOSED HIGH OVER AMAZONAS IN WESTERN BRASIL. A TROUGH TO THE
EAST...MEANWHILE...EXTENDS TO THE NORTHWEST ALONG 35S 30W...20S
40W...TO PARA IN BRASIL. THE RIDGE ALOFT IS VENTING DEEP
CONVECTION ACROSS AMAZONAS-ACRE IN BRASIL TO CENTRAL/NORTHERN
PERU...AS WELL AS ALONG THE SOUTHERN SIERRA OF PERU AND THE
ALTIPLANO OF BOLIVIA.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT
57S 112W ALONG A 140KT MAXIMA AT 59S 98W...59S 85W...EXITING AT
57S 71W. ANOTHER BRANCH FORMS AT 41S 71W ALONG 43S 64W...A 124KT
MAXIMA AT 47S 50W...51S 38W...A 145KT MAXIMA AT 59S 23W...61S 13W.
THE NORTHERN POLAR FORMS AT 26S 99W ALONG 29S 95W...A 127KT MAXIMA
AT 32S 90W...35S 81W...A 164KT MAXIMA AT 36S 71W...39S 59W...39S
46W. THE SUBTROPICAL JET FORMS AT 18S 106W ALONG 18S 100W...26S
90W...31S 78W...A 136KT MAXIMA AT 32S 69W...32S 58W...EXITING AT
25S 49W.

AT 500 HPA...A LOW AMPLITUDE TROUGH ON THE SOUTHERN STREAM EXTENDS
BETWEEN 120W-50W AND TO THE SOUTH OF 58S. A RIDGE TO THE NORTH
EXTENDS FROM A CLOSED HIGH NEAR 47S 95W TO TIERRA DEL
FUEGO/EXTREME SOUTHERN PORTIONS OF CHILE. IN A SPLIT FLOW
PATTERN...A SHORT WAVE TROUGH LIES TO THE NORTH...WITH AXIS FROM
30S 105W...ALONG 20S 104W...TO 15S 105W. AN ELONGATED TROUGH TO
THE EAST EXTENDS FROM 63S 35W...ALONG 53S 40W...50S 60W...CENTRAL
PATAGONIA...A LOW NEAR 45S 76W...TO 37S 85W.

THE SURFACE ANALYSIS SHOWS A 1037 HPA HIGH AT 42S 95W. A 1017 HPA
HIGH CENTERED AT 45S 63W. A 1022 HPA OCCLUDED LOW AT 39S 75W
EXTENDED A FRONT ALONG A 1016 HPA LOW AT 41S 68W...39S 68W...35S
72W. A 998 HPA LOW AT 51S 33W EXTENDED A FRONT ALONG 48S 34W...44S
38W...43S 46W...A 1010 HPA LOW AT 37S 58W...35S 63W...34S 69W. A
PRE-FRONTAL SQUALL LINE EXTENDED FROM RIO DE LA PLATA INTO
SOUTHERN CORDOBA. SHOWERS AND STRONG THUNDERSTORMS WERE OCCURRING
WITH THE SQUALL LINE.

CAROCA...DMC (CHILE)
DURAN...SENAMHI (PERU)
GALVEZ...WPC (USA)
DAVISON...WPC (USA)