THE WEATHER PREDICTION CENTER

COLLEGE PARK, MD


SOUTH AMERICAN SYNOPSIS




SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
957 AM EDT THU OCT 30 2014

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

SYNOPSIS (VALID FROM OCTOBER 30 AT 00UTC): NORTH OVER THE
CONTINENT...A WEAK CELL OF THE SUBTROPICAL RIDGE WAS ESTABLISHING
OVER ACRE IN BRASIL. TO THE EAST...A WEAK TROUGH EXTENDED FROM A
LOW OVER MATO GROSSO TO THE NORTH INTO EASTERN RONDONIA/CENTRAL
AMAZONAS. THIS WAS VENTILATING CONVECTION IN SOUTHEASTERN AND
CENTRAL PORTIONS OF THE AMAZON BASIN.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET
EXTENDING ALONG 67S 99W...A 126KT AT 60S 90W...A 128KT MAXIMA AT
50S 80W...47S 74W. ANOTHER BRANCH EXTENDED FROM 62S 110W ALONG 56S
93W...44S 83W...EXITING AT 40S 71W. THE NORTHERN POLAR FORMED AT
34S 86W ALONG 35S 73W...A 137KT MAXIMA AT 40S 60W...46S 51W...A
176KT MAXIMA AT 51S 40W...EXITING AT 45S 17W. A BRANCH OF THE
SUBTROPICAL JET FORMED AT 28S 84W ALONG 30S 77W...EXITING AT 31S
68W. IT REFORMED AT 36S 65W ALONG 39S 55W...47S 38W. ANOTHER
BRANCH FORMED AT 17S 93W ALONG 23S 83W...25S 73W...EXITING AT 25S
65W.

AT 500 HPA...A BROAD TROUGH CENTERED ON A LOW AT THE WEDDELL SEA
AT 65S 50W...EXTENDING INTO TIERRA DEL FUEGO AND SPLITTING INTO
TWO BROAD TROUGHS. ONE EXTENDING INTO SOUTHERN CHILE/EASTERN
PACIFIC AND FOCUSING CYCLONIC VORTICITY ADVECTION INTO THE
SOUTHERN THIRD OF CHILE/SOUTHERN PATAGONIA...AND ANOTHER EXTENDING
INTO THE MALVINAS/FALKLANDS AND CENTRAL ARGENTINA...FOCUSING ITS
ENERGY OVER CENTRAL PORTIONS OF ARGENTINA. A SHORT WAVE TROUGH
EXTENDED FROM URUGUAY INTO THE CHACO ARGENTINO...FOCUSING ITS
ENERGY ACROSS NORTHEASTERN ARGENTINA AND SOUTHERN BRASIL. A LOW
WAS WEAKENING OVER ESPIRITO SANTO IN BRASIL.

AT LOW LEVELS...A 998 OCCLUDED LOW CENTERED AT 59S 78W. ANOTHER
998 HPA OCCLUDED LOW CENTERED AT 49S 77W. TO THE EAST...A 980 HPA
OCCLUDED LOW CENTERED AT 52S 69W EXTENDING A FRONT INTO A 988 HPA
LOW AT 47S 65W...44S 66W...41S 70W...A 1004 HPA LOW AT 43S
73W...40S 76W...40S 84W. RAIN AND SNOW SHOWERS WERE OCCURRING IN
PORTIONS OF TIERRA DEL FUEGO AND SOUTHERN CHILE. A 1004 HPA LOW AT
37S 48W EXTENDED A FRONT INTO 32S 50W...SOUTHERN RIO GRANDE DO
SUL...CHACO IN ARGENTINA...SOUTHERN SANTIAGO DEL ESTERO. NUMEROUS
THUNDERSTORMS WERE OCCURRING WITH THIS SYSTEM.

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






Last Updated: 957 AM EDT THU OCT 30 2014