107
FXSA20 KWBC 091309
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
908 AM EDT TUE SEP 09 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z SEP 09). NO CHANGES ON THE NORTHERN
PORTIONS OF THE DOMAIN...AS THE 200 HPA ANALYSIS SHOWS A
DISORGANIZED FLOW PATTERN OVER THE CONTINENT TO THE NORTH OF 15S.
A RIDGE OVER THE EASTERN TROPICAL PACIFIC ENDS NEAR CENTRAL
PERU...WHILE AN OPEN RIDGE EXTENDS OVER AMAZONAS/RONDONIA IN
WESTERN BRASIL. A NORTHERN HEMISPHERE UPPER LOW CENTERS NEAR 00N
46W...EXTENDING A BROAD TROUGH TO NORTHERN COAST OF BRASIL.
TROPICAL CONVECTION CONCENTRATES ACROSS NORTHERN AMAZONAS-PARA IN
WESTERN BRASIL...WITH ADDITIONAL CONVECTION BUILDING JUST SOUTH
OF ILHA DE MARAJO.
THE JET ANALYSIS SHOWS THE SOUTHERN POLAR JET WITH AXIS ALONG 58S
120W...49S 99W...EXITING AT 62S 82W. THE NORTHERN POLAR HAS ITS
ENTRANCE NEAR 32S 116W...THEN ALONG A 147KT MAXIMUM AT 31S 96W...
CHILLAN EXITING NEAR 36S 53W. IT REFORMS AT 34S 44W...ALONG 39S
21W...AND A 128KT MAXIMUM AT 37S 06W. THE SUBTROPICAL JET LIES
ALONG 28S 120W...26S 100W...LA SERENA CHILE...EXITING AT 27S 55W.
IT REFORMS AT 26S 44W...ALONG 33S 19W...AND 28S 00W.
AT 500 HPA...A LOW ON THE SOUTHERN STREAM CENTERS NEAR 64S
100W...WITH A TROUGH ALONG 60S 90W...55S 90W...TO 47S 100W. THIS
IS PHASING WITH A TROUGH ON THE NORTHERN STREAM...WITH THE LATTER
EXTENDING ALONG 50S 80W...40S 85W...35S 90W...TO 30S 100W.
ANOTHER SHORT WAVE TROUGH EXTENDS FARTHER TO THE EAST...WITH AXIS
ALONG 54S 52W...45S 50W...TO 37S 50W. FARTHER NORTH...A RIDGE
EXTENDS WEST ACROSS THE TROPICAL ATLANTIC TO CENTRAL
BRASIL...WHERE IT SUSTAINS A TRADE WIND INVERSION.
AT LOW LEVELS...A DEEP 946 HPA LOW NEAR 73S 97W EXTENDS A FRONT
ALONG A 950 HPA LOW AT 66S 94W...51S 87W...AND 39S 105W. A FRONT
TO THE NORTH EXTENDS FROM A 994 HPA LOW AT 50S 84W...THEN ALONG A
998 HPA TRIPLE POINT LOW AT 45S 79W...37S 82W...32S 86W...A 1018
HPA LOW AT 28S 93W...AND 27S 99W. FARTHER EAST...AN ELONGATED
FRONT EXTENDS FROM A 986 HPA LOW AT 67S 56W...992 HPA LOW AT 65S
51W...60S 53W...TIERRA DEL FUEGO...A 1010 HPA LOW AT 50S 69W...TO
PATAGONIA. ANOTHER FRONT EXTENDS ALONG A 1006 HPA LOW AT 55S
47W...46S 48W...39S 57W...A 1018 HPA LOW AT 40S 62W...36S
64W...NORTHERN MENDOZA INTO THE EASTERN PACIFIC. LIGHT RAINFALL
WAS REPORTED ALONG THE CENTRAL COAST OF ARGENTINA. THERE IS ALSO
AN OCCLUDED 1002 HPA LOW AT 38S 32W EXTENDING A FRONT ALONG A
1010 HPA TRIPLE POINT LOW AT 37S 26W...26S 32W...RIO DE
JANEIRO...EASTERN SAO PAULO...TO A 1018 HPA LOW AT 27S 53W...TO
SOUTHERN BOLIVIA. SCATTERED DEEP CONVECTION WAS REPORTED OVER
SOUTHERN BRASIL. A RIDGE TO THE SOUTH CENTERS ON TWO HIGHS...A
1027 HPA AT 34S 51W AND A 1025 HPA HIGH AT 28S 46W.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DAVISON...HPC (USA)
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