689
FXSA20 KWBC 241238
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
837 AM EDT THU MAY 24 2012
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00UTC MAY 24): AT 200 HPA...THE SUBTROPICAL
RIDGE CENTERED ON A HIGH OVER AMAZONAS IN WESTERN
BRASIL...RIDGING ACROSS PERU TO THE TROPICAL PACIFIC ALONG 05S
100W. EAST OF THIS AXIS...A TROUGH EXTENDED NORTH ALONG 40W TO
THE NORTHERN BRAZILIAN COAST. CONVECTION HAD DECREASED IN
COVERAGE WITH RESPECT TO PREVIOUS DAYS AND WAS BUILDING OVER
WESTERN AMAZONIA INTO EASTERN PERU. SCATTERED CONVECTION WAS ALSO
OCCURRING ALONG THE NORTH COAST OF BRASIL...AND OFF THE COAST OF
EASTERN BRASIL...ASSOCIATED WITH THE UPPER TROUGH.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR FORMING AT 54S
100W ALONG 53S 85W...A 122KT MAXIMA OVER SANTA CRUZ IN
ARGENTINA...A 138KT MAXIMA AT 49S 55W...47S 38W...42S 25W. THE
NORTHERN POLAR EXTENDS ALONG A 171KT MAXIMA AT 40S 130W...A 193KT
MAXIMA AT 39S 115W...32S 93W...39S 88W...ISLA CHILOE...PENINSULA
VALDEZ...EXITING AT 41S 56W. IT REFORMED AT 35S 50W...A 150KT AT
46S 25W...EXITING AT 41S 10W. THE SUBTROPICAL JET EXTENDED ALONG
A 143KT MAXIMA AT 34S 113W...26S 96W...30S 86W...ANTOFAGASTA IN
CHILE...CHACO PARAGUAYO...EXITING OVER EASTERN PARAGUAY. IT
REFORMED OVER RIO DO JANEIRO EXITING OVER SOUTHERN BAHIA. IT
REFORMED 17S 34W ALONG 25S 18W...26S 01W.
AT 500 HPA...A RIDGE IS BUILDING SOUTH BETWEEN 130W-90W TO THE
POLAR ICE CAP. EAST OF THIS AXIS...A BROAD TROUGH ON THE SOUTHERN
STREAM EXTENDS BETWEEN 90W-20W AND SOUTH OF 50S. SHORT WAVE
VORTICES REVOLVING AROUND THIS AXIS ARE LIFTING NORTH ACROSS THE
BELLINGSHAUSEN SEA TO TIERRA DEL FUEGO/EXTREME SOUTHERN CHILE. ON
THE NORTHERN STREAM...A LARGE SHORT WAVE TROUGH EXTENDS ALONG 50S
110W INTO 20S 85W WHILE APPROACHING CHILE. ANOTHER IS MOVING
ACROSS URUGUAY-NORTHEAST ARGENTINA-PARAGUAY. A LOW AMPLITUDE
RIDGE BETWEEN 85W-65W SEPARATES THESE PERTURBATIONS.
AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A990 HPA OCCLUDED LOW
AT 55S 52W EXTENDING A FRONT ALONG A 994 HPA AT 54S 45W...47S
50W...47S 62W...SOUTHERN BAHIA DE SAN JORGE...SOUTHERN CHILE.
RAINFALL WAS BEING REPORTED IN USHUAIA. A 1017 HPA HIGH CENTERED
OVER THE EASTERN PACIFIC AT 34S 79W. A 1023 HPA HIGH CENTERED
OVER SOUTHEASTERN BUENOS AIRES PROVINCE AND RIDGED TO ANOTHER
1023 HPA HIGH OVER CORDOBA IN ARGENTINA. A 1006 HPA LOW AT 46S
23W EXTENDED A FRONT ALONG 41S 28W...37S 41W...SOUTHERN RIO
GRANDE DO SUL...URUGUAIANA...EASTERN PARAGUAY...SOUTHEASTERN
BOLIVIA...CENTRAL BOLIVIA. RAINFALL AND THUNDERSTORMS WERE BEING
REPORTED AHEAD OF THE COLD FRONT. TO THE EAST...A 1029 HPA HIGH
CENTERED AT 33S 29W.
PARRENO...INAMHI (ECUADOR)
VILLELA...INMET (BRASIL)
GALVEZ...HPC (USA)
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