806
FXSA20 KWBC 291312
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
912 AM EDT TUE JUL 29 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z JUL 29). A 200 HPA HIGH AT 05S 57W
ANCHORS A RIDGE THAT EXTENDS OVER THE CONTINENT TO THE NORTH OF
20S AND WEST OF 50W. THE RIDGE AXIS TRAVERSES NORTHERN PERU INTO
THE TROPICAL EASTERN PACIFIC. THE INTENSITY OF THIS RIDGE IS A
REFLECTION OF UNUSUALLY ACTIVE TROPICAL CONVECTION OVER PARA-
AMAZONAS IN BRASIL AND THE NORTHERN JUNGLE OF PERU. THE BROAD
RIDGE PATTERN FAVORS AMPLIFICATION OF A TROUGH ALONG 20S 40W TO
THE AMAZON RIVER DELTA. THIS WAS ENHANCING LATE AFTERNOON
CONVECTION ACROSS ILHA DE MARAJO AND AMAPA IN BRASIL.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS AT 250 HPA
EXTENDING ALONG 62S 120W...55S 99W...PUNTA ARENAS CHILE...EXITING
AT 59S 60W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 37S 122W...
ALONG 46S 111W...A 160KT MAXIMUM AT 50S 94W...46S 82W...EXITING
AT 41S 75W. IT REFORMS NEAR LA SERENA CHILE...THEN ACROSS BUENOS
AIRES PROVINCE...37S 54W...36S 40W...32S 22W...AND A 151KT
MAXIMUM AT 34S 05W. THE SUBTROPICAL JET LIES ALONG 28S 120W...
39S 105W...40S 88W...EXITING NEAR JUAN FERNANDEZ ISLAND. IT
REFORMS NEAR 15S 89W...ALONG 19S 76W...24S 65W...25S
57W...EXITING AT 19S 47W.
THE 500 HPA ANALYSIS SHOWS A BROAD TROUGH ON THE SOUTHERN STREAM
FLOW...ENVELOPING AREA BETWEEN 110W-60W AND SOUTH OF 40S. THE
TROUGH CENTERS ON A CLOSED LOW AT 65S 89W...AND IT IS FOCUSING
ITS SHORT WAVE ENERGY OVER SOUTHERN CHILE/TIERRA DEL FUEGO. THE
TROUGH LIES SOUTH OF A NORTHERN STREAM RIDGE THAT BOUNDS BETWEEN
110W-85W AND NORTH OF 45S. FARTHER EAST AND NORTH...AN ELONGATED
TROUGH EXTENDS ACROSS THE MALVINAS/FALKLAND ISLANDS...LA PAMPA...
35S 70W...25S 80W...TO 20S 87W. SHORT WAVE VORTICES ARE SHEARING
AHEAD OF THIS AXIS...WITH ONE SPREADING ACROSS MENDOZA/
CORDOBA...WHILE ANOTHER LIES OFF THE SOUTHERN COAST OF BRASIL.
AT LOW LEVELS...A BROAD TROUGH DOMINATES THE SOUTHERN STREAM
FLOW...CENTERING ON AN OCCLUDED 954 HPA LOW AT 65S 88W...WITH A
FRONT ALONG A 962 HPA LOW AT 69S 84W...68S 75W...A 970 HPA LOW AT
63S 70W...60S 65W...A 994 HPA LOW AT 53S 70W...48S 68W...TO 44S
71W. AN ELONGATED FRONT LIES TO THE EAST...WITH AXIS ALONG A 998
HPA LOW AT 57S 56W...55S 54W...A 1002 HPA LOW AT 50S 59W...43S
62W...TO LA PAMPA IN ARGENTINA. RIDGES TO THE EAST AND NORTH
CENTER ON CLOSED HIGHS...WITH A 1029 HPA HIGH AT 32S 87W...A 1029
HPA AT 38S 78W...A 1025 HPA AT 39S 52W...AND A 1029 HPA HIGH AT
45S 37W. A 1018 HPA LOW AT 32S 42W EXTENDS A FRONT ALONG 28S
43W...26S 46W...SANTA CATARINA...RIO GRANDE DO SUL...SOUTHERN
PARAGUAY TO SOUTHERN BOLIVIA. SCATTERED DEEP CONVECTION WAS
REPORTED OVER SOUTHERN BRASIL AND CENTRAL MESOPOTAMIA.
COLMAN...DMH (PARAGUAY)
GUZMAN...SENAMHI (BOLIVIA)
DAVISON...HPC (USA)
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