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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1324Z Apr 09, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
924 AM EDT THU APR 09 2015

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

SYNOPSIS (VALID FROM APRIL 09 AT 00UTC): NORTH OVER THE
CONTINENT...AT 200 HPA...A TUTT LOW OVER THE AMAZON RIVER DELTA
ANCHORS A TROUGH ACROSS THE NORTHERN STATES OF BRASIL-THE GUIANAS.
THIS IS ENHANCING COASTAL CONVECTION ACROSS NORTHERN BRASIL INTO
PORTIONS OF PARA-AMAZONAS TO THE NORTHWEST. SOUTH OF THIS AXIS...A
NARROW/ELONGATED CELL OF THE SUBTROPICAL RIDGE STRETCHES ALONG 14S
30W...15S 50W...TO SANTA CRUZ IN EASTERN BOLIVIA. THIS IS VENTING
SCATTERED DEEP CONVECTION ACROSS CENTRAL PORTIONS OF BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR EXTENDING ALONG
51S 120W...A 125KT MAXIMA AT 50S 115W...EXITING AT 47S 99W.
ANOTHER BRANCH EXTENDS ALONG 46S 120W ALONG 42S 100W...A 115KT
MAXIMA AT 44S 90W...EXITING AT 47S 82W. THE NORTHERN POLAR JET
FORMS ALONG 34S 106W ALONG A 139KT MAXIMA AT 40S 95W...41S
80W...EXITING AT 41S 67W. THE SUBTROPICAL JET EXTENDS ALONG 30S
120W...29S 110W...33S 96W...EXITING AT 35S 81W. IT REFORMS AT 27S
50W ALONG 28S 32W...31S 18W...EXITING AT 37S 10W.

AT MID LEVELS...BROAD TROUGH DOMINATES FLOW ACROSS THE EASTERN
PACIFIC...WITH AXIS EXTENDING BETWEEN 130W-80W TO 27S. THIS IS
FOCUSING SHORT WAVE ENERGY INTO SOUTHERN PORTIONS OF CHILE AND
PATAGONIA IN ARGENTINA. RIDGE TO THE EAST EXTENDS FROM 40S
53W...ACROSS THE MALVINAS/FALKLAND ISLANDS...TO THE ANTARCTIC
PENINSULA/BELLINGSHAUSEN SEA. DOWNSTREAM FROM THIS RIDGE...BROAD
TROUGH OVER THE SOUTH ATLANTIC EXTENDS BETWEEN 45W-05W TO 27S.

THE SURFACE ANALYSIS SHOWS A 966 HPA LOW AT 60S 102W EXTENDS A
FRONT TO A 970 HPA LOW AT 62S 96W...57S 81W...51S 77W...39S 85W. A
986 HPA LOW AT 60S 80W EXTENDS A FRONT INTO 56S 71W...A 1002 HPA
LOW AT 51S 70W...44S 66W...39S 70W. RAINFALL WAS BEING REPORTED IN
PARTS OF PATAGONIA AND SOUTHERN CHILE. TWO 1021 HPA HIGHS CENTER
AT 40S 50W AND33S 46W. A FRONT EXTENDS ALONG 28S 17W...21S
28W...18S 42W...19S 51W. SCATTERED THUNDERSTORMS WERE OCCURRING TO
THE NORTH OF THIS BOUNDARY.

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