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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1329Z Aug 28, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
929 AM EDT THU AUG 28 2014

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

SYNOPSIS (VALID FROM AUGUST 28 AT 00UTC): NORTH OVER THE
CONTINENT...AN UPPER RIDGE CENTERED AT OVER EASTERN
AMAZONAS/WESTERN PARA IN BRASIL. MOST ACTIVITY WAS OCCURRING TO
THE WEST OF THIS RIDGE...WITH SCATTERED THUNDERSTORMS DOTTING
CENTRAL/NORTHERN PERU INTO ECUADOR/SOUTHERN COLOMBIA AND WESTERN
BRASIL..

THE 250 HPA JET ANALYSIS SHOWS A SMALL BRANCH OF THE SOUTHERN
POLAR JET FORMING AT 56S 65W...EXITING AT 55S 54W. THE NORTHERN
POLAR FORMS AT 28S 78W EXITING AT 31S 61W. A NEW BRANCH FORMS AT
31S 57W...ALONG 30S 39W...33S 32W....A 140KT MAXIMA AT 40S 27W.
THE SUBTROPICAL JET FORMS AT 16S 91W ALONG 20S 82W...A 137KT
MAXIMA AT 26S 70W...27S 59W...A 155KT MAXIMA AT 27S 49W...EXITING
AT 21S 29W.

AT 500 HPA...A LARGE LONG WAVE TROUGH EXTENDED ALONG 50S
100W...30S 85W...20S 80W. THIS TROUGH WAS MOVING VERY LITTLE AS A
BLOCKING RIDGE EXTENDED TO THE EAST. THE RIDGE EXTENDED FROM
SOUTHERN BOLIVIA INTO CENTRAL ARGENTINA...MALVINAS/TIERRA DEL
FUEGO. ANOTHER TROUGH CENTERED ON A LOW AT 45S 40W...FOCUSING
CYCLONIC VORTICITY JUST OFFSHORE OF THE SOUTHERN BUENOS AIRES
PROVINCE. A MUCH SMALLER SHORT WAVE TROUGH CENTERED AT 55S 80W
FOCUSING ITS ENERGY ACROSS THE MAGALLANES PROVINCE/TIERRA DEL
FUEGO.

THE SURFACE ANALYSIS SHOWS A 1008 HPA LOW AT 57S 62W EXTENDING A
FRONT ALONG A 1010 HPA LOW AT 55S 66W...RIO GALLEGOS...A 1000 HPA
LOW AT 53S 76W...48S 80W...A 998 HPA LOW AT 45S 89W. RAINFALL WAS
OCCURRING ACROSS MOST OF TIERRA DEL FUEGO. A 1021 HPA HIGH
CENTERED AT 39S 59W. A 1002 HPA LOW AT 37S 27W EXTENDED A FRONT
ALONG 28S 32W...22S 40W...17S 49W...AND A WEAKENING TAIL ALONG 13S
55W INTO NORTHERN BOLIVIA/SOUTHEASTERN PERU. RAINFALL WAS
OCCURRING ACROSS EASTERN RIO DO JANEIRO/ESPIRITO SANTO.

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