Skip Navigation Links weather.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center
 
South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1345Z Apr 16, 2015)
 
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
 
Abbreviations and acronyms used in this product


SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
945 AM EDT THU APR 16 2015

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

SYNOPSIS (VALID FROM APRIL 16 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS BROAD CELL OF THE SUBTROPICAL RIDGE OVER THE
CONTINENT...WITH AXIS ENVELOPING AREA TO THE NORTH OF 30S WHILE
ANCHORING ON A CLOSED HIGH OVER BRASIL NEAR 13S 55W. THE
SUBEQUATORIAL RIDGE LIES TO THE NORTH...EXTENDING WEST FROM A
CLOSED HIGH NEAR 05N 33W...ACROSS THE GUIANAS-VENEZUELA TO
COLOMBIA. THESE VENT ORGANIZED DEEP CONVECTION OVER THE CONTINENT
TO THE NORTH OF 20S...WITH MOST ACTIVE CLUSTERING OVER EQUATORIAL
SOUTH AMERICA AND NORTHWARD.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT
58S 87W ALONG 62S 61W...51S 48W...44S 36W...50S 24W...58S 15W. THE
NORTHERN POLAR JET FORMS AT 35S 124W ALONG 40S 118W...A 123KT
MAXIMA AT 41S 111W...43S 102W...46S 94W...EXITING AT 47S 87W. IT
REFORMS AT 31S 78W ALONG 38S 71W...41S 64W...41S 53W...A 121KT
MAXIMA AT 40S 36W...EXITING AT 40 24W. THE SUBTROPICAL JET FORMS
AT 20S 85W ALONG 28S 70W...30S 57W...30S 40W. ANOTHER BRANCH FORMS
AT 15S 84W EXITING AT 21S 73W.

AT 500 HPA...AN ELONGATED TROUGH EXTENDS FROM THE BELLINGSHAUSEN
SEA...ALONG 60S 90W...55S 100W...A CLOSED LOW AT 47S 110W...TO 37S
120W. THIS IS PRESSING AGAINST A SKEWED RIDGE THAT EXTENDS FROM
30S 100W...ALONG 50S 80W...TIERRA DEL FUEGO TO THE ANTARCTIC
PENINSULA. A TROUGH ON THE NORTHERN STREAM MEANDERS OFF THE COAST
OF CHILE... ORIGINATING ON A CLOSED LOW AT 41S 76W...ALONG 30S
80W...TO 20S 90W. THIS IS PRESSING AGAINST A RIDGE TO THE EAST
THAT EXTENDS SOUTH ALONG 60W TO THE MALVINAS/FALKLAND ISLANDS.
BROAD TROUGH OVER THE SOUTH ATLANTIC DOMINATES FLOW BETWEEN
55W-10W AND TO THE SOUTH OF 25S.

A 1021 HPA HIGH CENTERS AT 36S 88W. TO THE EAST...A 1025 HPA HIGH
CENTERS AT 43S 60W. A 1018 HPA OCCLUDED LOW CENTERS AT 38S 77W.
THIS EXTENDS A FRONT INTO CHILOE...AND A 1010 HPA LOW AT 39S
72W...35S 73W...30S 80W...25S 92W. RAINFALL WAS BEING REPORTED IN
PARTS OF SOUTHERN CHILE ND WESTERN PATAGONIA. A FRONT EXTENDS
ALONG 33S 43W...32S 54W...33S 68W. SCATTERED CONVECTION WAS
OCCURRING ALONG AND TO THE SOUTH OF THIS SYSTEM WITH RAINFALL
BEING REPORTED OVER BUENOS AIRES PROVINCE. ANOTHER STATIONARY
FRONT EXTENDS ALONG 24S 19W...20S 28W...EXTREME SOUTHERN BAHIA.

CALLE...UNALM (PERU)
CHARPENTIER...DMC (CHILE)
SCHNEIDER...INMET (BRASIL)
DAVISON...WPC (USA)
GALVEZ...WPC (USA)