915
FXSA20 KWBC 041302
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
901 AM EDT MON AUG 04 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z AUG 04). ALOFT...AT 200 HPA...THE
SUBTROPICAL RIDGE NOW CONFINES TO CONTINENTAL AREA NORTH OF 10S.
ILL ORGANIZED HIGHS CENTERS NEAR THE AMAZON RIVER DELTA/ILHA
DE MARAJO AND 10S 43W. TROPICAL CONVECTION IS BUILDING ACROSS
NORTHERN PARA-AMAZONAS IN WESTERN BRASIL TO EASTERN
ECUADOR...WITH CONVECTIVE CELLS ACROSS THE PERUVIAN JUNGLE
ASSOCIATING WITH A POLAR FRONT TO THE SOUTH.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
54S 120W...A 158KT MAXIMUM AT 52S 114W...50S 99W...EXITING AT 46S
88W. IT REFORMS AT 53S 68W...ALONG 59S 69W...EXITING AT 66S 74W.
IT HAS A BRANCH FARTHER EAST WITH ENTRANCE NEAR 43S 37W...ALONG
47S 29W...AND 53S 18W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 40S
110W...ALONG 38S 95W...A 148KT MAXIMUM AT 39S 84W...39S 65W...36S
57W...EXITING AT 33S 45W. IT REFORMS AT 34S 41W...CROSSING 39S
32W...A 164KT MAXIMUM AT 42S 22W...AND 46S 09W. THE SUBTROPICAL
JET HAS ITS ENTRANCE AT 33S 95W...ACROSS JUAN FERNANDEZ
ISLAND...EXITING NEAR LA SERENA CHILE. IT REFORMS OVER THE
CONTINENT NEAR SANTA CRUZ...CROSSING SAO PAULO...26S 42W...A
154KT MAXIMUM AT 36S 27W...EXITING AT 34S 15W.
ON THE SOUTHERN STREAM...AT 500 HPA...A BROAD TROUGH LIES BETWEEN
120W-65W AND SOUTH OF 50S...CENTERING ON DUAL LOWS...WITH ONE
NEAR 57S 104W AND THE OTHER AT 64S 90W. A SHORT WAVE TROUGH TO
THE NORTH EXTENDS ALONG 50S 80W...40S 85W...38S 90W...TO 38S
100W. THIS TROUGH IS SLIDING UNDER A RIDGE ON THE NORTHERN STREAM
THAT BOUNDS BETWEEN 20S-30S AND WEST OF 70W. EAST OVER THE
ATLANTIC...A RIDGE ON THE SOUTHERN STREAM BOUNDS BETWEEN 65W-30W
AND SOUTH OF 50S...CENTERING ON A CLOSED HIGH NEAR 62S 47W. EAST
AND NORTH OF THIS RIDGE...A TROUGH EXTENDS ALONG 57S 20W...50S
40W...A LOW AT 48S 48W...THEN NORTH ALONG 40S 44W...30S 45W...TO
SAO PAULO IN BRASIL. NOTE THAT MOST OF THE SHORT WAVE ENERGY WITH
THIS SYSTEM LIES OVER THE WESTERN ATLANTIC BETWEEN 45W-20W AND
SOUTH OF 20S.
A LOW LEVELS...A RIDGE OVER THE EASTERN PACIFIC CENTERS ON TWO
1033 HPA HIGHS...WITH ONE NEAR 40S 124W AND THE OTHER NEAR 39S
110W. SOUTH OF THIS RIDGE...A BROAD TROUGH DOMINATES THE SOUTHERN
STREAM...WITH AN OCCLUDED 970 HPA LOW AT 59S 100W EXTENDING A
FRONT ALONG A 974 HPA TRIPLE POINT LOW AT 57S 93W...55S 92W...A
986 HPA LOW AT 52S 100W...48S 108W...AND 48S 118W. THIS SYSTEM IS
INTERACTING WITH A FRONT TO THE NORTH...ORIGINATING ON A 1004 HPA
LOW AT 48S 100W...THEN ALONG 45S 104W...AND 45S 120W. A DEEP
OCCLUDED 966 HPA LOW CENTERS NEAR 61S 82W. FARTHER NORTH...A
PROGRESSIVE FRONT EXTENDS FROM A 994 HPA LOW AT 52S 78W...ALONG A
1000 HPA TRIPLE POINT LOW AT 49S 77W...41S 77W...39S 83W...AND
36S 90W. ANOTHER EXTENDS FROM A 998 HPA LOW AT 48S 63W...ALONG A
1002 HPA LOW AT 42S 58W...SOUTHERN BUENOS AIRES PROVINCE/LA
PAMPA-CONCEPCION CHILE...A 1014 HPA LOW AT 38S 76W...SOUTH OF
JUAN FERNANDEZ ISLAND...TO 33S 92W. OVER THE ATLANTIC...A RIDGE
ON THE SOUTHERN STREAM CENTERS ON A 1017 HPA HIGH AT 57S 44W. A
TROUGH TO THE NORTH CENTERS ON AN OCCLUDED 978 HPA LOW AT 45S
22W...WITH A FRONT ALONG 48S 23W...A 998 HPA LOW AT 47S 14W...39S
16W...34S 27W...A 1006 HPA LOW AT 32S 34W...24S 37W...RIO DE
JANEIRO-GOIAS-MATO GROSSO TO NORTHERN BOLIVIA...WHERE IT FAVORED
SCATTERED CONVECTION. A POLAR RIDGE TO THE SOUTH CENTERS ON A
1019 HPA HIGH AT 29S 52W.
GUZMAN...SENAMHI (BOLIVIA)
DAVISON...HPC (USA)
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