THE WEATHER PREDICTION CENTER

COLLEGE PARK, MD


SOUTH AMERICAN SYNOPSIS




SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
931 AM EDT THU OCT 23 2014

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

SYNOPSIS (VALID FROM OCTOBER 23 AT 00UTC): AT UPPER LEVELS...AN
ANTICYCLONE CENTERS OFF THE COAST OF NORTHWESTERN PERU WHILE A
BROAD TROUGH EXTENDS FROM ALAGOAS/PERNAMBUCO IN BRASIL INTO THE
AMAZON DELTA AND OFF THE COASTS OF AMAPA. THIS IS LEADING TO THE
BEST VENTILATION ACROSS THE INTERIOR OF MARANHAO IN BRASIL INTO
PARA AND EASTERN AMAZONAS. A WEAK SHORT WAVE EXTENDS ACROSS
EASTERN MATO GROSSO-GOIAS INTO SOUTHERN PARA. THIS TROUGH IS
VENTILATING CONVECTION MOSTLY ACROSS EASTERN MATO GROSSO AND
GOIAS. A THIRD TROUGH IS CROSSING THE ANDES FROM NORTHERN
ARGENTINA INTO CENTRAL PERU. THIS TROUGH IS VENTILATING CONVECTION
ACROSS THE EASTERN SLOPES OF THE ANDES/LAKE TITICACA REGION...AND
IN EASTERN FOOTHILLS OF THE ANDES IN NORTHWESTERN
ARGENTINA/SOUTHERN BOLIVIA.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET
EXTENDING ALONG 65S 109W...A 150KT MAXIMA AT 59S 90W...56S
76W...EXITING AT 58S 55W. THE NORTHERN POLAR JET FORMS AT 28S
107QW ALONG A 127KT MAXIMA AT 29S 90W...41S 80W...A 150KT MAXIMA
AT 45S 69W...A 166KT MAXIMA AT 45S 49W...41S 34W...EXITING AT 33S
28W. A BRANCH OF THE SUBTROPICAL JET EXTENDS ALONG 23S 110W...25S
97W...EXITING AT 28S 85W.

AT 500 HPA...A LARGE UPPER TROUGH CENTERS AT 32S 97W AND IS MOVING
VERY LITTLE. TO THE EAST...A RIDGE CENTERS ON A HIGH OVER NORTHERN
URUGUAY...WHILE A WEAK SHORT WAVE TROUGH IS PRESSING FROM THE EAST
EXTENDING ALONG THE ANDES OF NORTHERN ARGENTINA INTO SOUTHWESTERN
BOLIVIA. IN THE SOUTHERN STREAM...A SHORT WAVE TROUGH IS
APPROACHING THE DRAKE PASSAGE FOCUSING ITS ENERGY TO THE SOUTHWEST
OF TIERRA DEL FUEGO.

AT LOW LEVELS...A 964 HPA LOW AT 67S 73W EXTENDS A FRONT INTO 61S
66W...56S 72W...52S 82W. A 1006 HPA LOW AT 42S 45W EXTENDS A FRONT
ALONG 39S 46W...38S 53W...BUENOS AIRES PROVINCE...A 1014 HPA LOW
AT 38S 69W...32S 68W. A 1025 HPA HIGH CENTERS AT 31S 38W. A 1018
HPA LOW AT 32S 12W EXTENDED A FRONT ALONG 28S 15W...24S 22W...20S
30W...SOUTHERN BAHIA IN BRASIL. RAINFALL WAS OCCURRING IN PARTS OF
BAHIA IN BRASIL.

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






Last Updated: 931 AM EDT THU OCT 23 2014