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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1327Z Apr 28, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
927 AM EDT TUE APR 28 2015

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

SYNOPSIS (VALID FROM APRIL 28 AT 00UTC): UPPER LEVEL ANALYSIS
SHOWS SUBTROPICAL RIDGE OVER THE CONTINENT...WITH AXIS AT 200 HPA
ENVELOPING AREA TO THE NORTH OF 24S...AND CENTERING OF A CLOSED
HIGH OVER AMAZONAS IN BRASIL. THE RIDGE ALOFT IS VENTING DEEP
CONVECTION ACROSS CENTRAL-WESTERN PORTIONS OF BRASIL...INTO PERU
AND BOLIVIA.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET ALONG A
123KT MAXIMA AT 50S 121W...46S 112W...A 132KT MAXIMA AT 48S
100W...EXITING AT 51S 90W. IT REFORMS AT 54S 84W ALONG 62S
80W...EXITING AT 66S 68W. THE NORTHERN POLAR JET EXTENDS ALONG 42S
120W...41S 114W...43S 102W...45S 91W...EXITING AT 45S 82W. IT
REFORMS AT 47S 78W ALONG 57S 76W...EXITING AT 61S 71W. IT REFORMS
AT 58S 57W ALONG 54S 55W...EXITING AT 49S 58W. ANOTHER BRANCH
FORMS AT 31S 105W ALONG 34S 94W...38S 84W...42S 76W...EXITING AT
47S 67W...REFORMING AT 47S 64W ALONG 40S 57W...EXITING AT 38S 52W.
THE SUBTROPICAL JET EXTENDS ALONG 26S 120W...23S 113W...27S
100W...EXITING AT 33S 83W. A FINGER EXTENDS FROM 33S 56W EXITING
AT 33S 48W.

AT 500 HPA...BROAD/LONG WAVE TROUGH EXTENDS OVER THE EASTERN
PACIFIC...AS IT BOUNDS BETWEEN 120W-70W AND TO THE SOUTH OF 30S.
THE TROUGH IS PRESSING AGAINST A LONG WAVE RIDGE TO THE EAST THAT
EXTENDS SOUTH ACROSS ARGENTINA-DRAKE PASSAGE TO THE ANTARCTIC
PENINSULA/WEDDELL SEA. IN A HIGHLY AMPLIFIED LONG WAVE PATTERN
ANOTHER TROUGH LIES TO THE EAST...WITH AXIS BETWEEN 54W-10W AND TO
THE SOUTH OF 30S.

THE SURFACE ANALYSIS SHOWS A 972 HPA LOW AT 63S 88W EXTENDING A
FRONT ALONG 60S 83W...58S 84W...A 978HPA LOW AT 56S 84W...52S
75W...47S 76W...A 1010 HPA LOW AT 44S 78W...38S 77W...31S
90W...27S 104W. A 986 HPA LOW AT 51S 13W EXTENDS A FRONT ALONG 46S
16W...43S 23W...36S 30W...35S 47W...38S 63W. RAINFALL WAS BEING
REPORTED IN PARTS OF THE SOUTHERN BUENOS AIRES PROVINCE IN
ARGENTINA. A 1029 HPA POLAR HIGH CENTERS 46S 59W. A 1014 HPA LOW
AT 23S 27W EXTENDS A FRONT ALONG 20S 32W...20S 36W...18S 41W.
RAINFALL WAS BEING REPORTED IN PARTS OF BAHIA IN BRASIL.

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