299
FXSA20 KWBC 061309
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
908 AM EDT MON OCT 06 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z OCT 02). ANALYSIS AT 200 HPA SHOWS TWO
CELLS OF THE SUBTROPICAL RIDGE WITH ONE OVER THE EASTERN PACIFIC
AND THE OTHER OVER THE WESTERN ATLANTIC. THE FORMER CENTERS ON A
CLOSED HIGH OFF THE COAST OF PERU NEAR 12S 88W...WHILE THE LATTER
CENTERS NEAR 14S 34W. A TROUGH ALONG 67W SEPARATES THESE RIDGES.
SATELLITE IMAGERY SHOWS A VERY ACTIVE CONVECTIVE PATTERN ACROSS
SOUTHEAST BRASIL-EL PANTANAL TO MATO GROSSO/RONDONIA...AND THE
NORTHERN JUNGLE OF BOLIVIA AND THE JUNGLE OF PERU.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE
AT 59S 119W...THEN ALONG 66S 90W...A 149KT MAXIMUM AT 53S
74W...45S 58W...50S 40W...EXITING AT 55S 21W. THE NORTHERN POLAR
HAS A FINGER THAT LIES BETWEEN 39S 100W AND 50S 104W. IT REFORMS
AT 57S 99W...ALONG 43S 74W...EXITING AT 29S 67W. IT REFORMS AT
29S 62W...ALONG A 193KT MAXIMUM AT 38S 41W...41S 13W...EXITING AT
22S 11W. THE SUBTROPICAL JET LIES ALONG 32S 120W...31S
105W...EXITING AT 26S 98W. IT REFORMS AT 25S 94W...ALONG 25S
82W...EXITING AT 19S 74W. IT REFORMS AT 18S 63W...ALONG 33S
41W...36S 17W...EXITING AT 16S 16W.
AT 500 HPA A NEGATIVELY TILTED TROUGH EXTENDS FROM A CLOSED LOW
NEAR 43S 113W...ALONG 38S 100W...30S 96W...TO 25S 99W. THIS
TROUGH IS PUSHING AGAINST A RIDGE THAT EXTENDS ALONG 30S
87W...45S 90W...TO 60S 100W. EAST OF THIS RIDGE...A HIGH
AMPLITUDE LONG WAVE TROUGH BOUNDS BETWEEN 75W-25W AND SOUTH OF
25S. NUMEROUS SHORT WAVE PERTURBATIONS ARE REVOLVING AROUND THIS
AXIS...WITH CYCLONIC VORTICITY FOCUSING ACROSS EXTREME SOUTHERN
CHILE/ARGENTINA AND INTO THE FALKLAND ISLANDS. A CYCLONIC
VORTICITY TONGUE EXTENDS ALONG 40S 40W TO RIO GRANDE DO SUL
BRASIL...WHILE ANOTHER EXTENDS ACROSS NORTHERN SANTA CATARINA/
SOUTHERN SAO PAULO TO CENTRAL BOLIVIA.
AT LOW LEVELS...A BLOCKING RIDGE IS INITIALIZED OVER THE FAR
EASTERN PACIFIC...WITH A 1027 HPA HIGH AT 31S 84W AND A 1025 HPA
HIGH AT 42S 84W. FARTHER EAST...A BROAD TROUGH DOMINATES THE
SOUTHERN STREAM FLOW OVER THE ATLANTIC...WITH A 974 HPA LOW AT
58S 40W EXTENDING A FRONT ALONG A 982 HPA TRIPLE POINT LOW AT 57S
31W...53S 32W...A 982 HPA LOW AT 54S 40W...48S 41W...A 1000 HPA
LOW AT 46S 50W...38S 56W...TO SOUTHERN MENDOZA IN ARGENTINA. A
SECONDARY FRONT CLOSELY FOLLOWS...WITH A 988 HPA LOW AT 49S
54W... THEN ALONG 45S 57W...44S 64W...A 1006 HPA LOW AT 46S
69W...TO EXTREME SOUTHERN CHILE. COASTAL SNOW SHOWERS WERE
REPORTED OVER SOUTHERN CHILE AND EASTERN PATAGONIA. ON THE
NORTHERN STREAM...A FRONT LIES ALONG A 1004 HPA LOW AT 33S
33W...A 1006 HPA TRIPLE POINT LOW AT 34S 31W...27S 35W...RIO DE
JANEIRO-MATO GROSSO DO SUL TO RONDONIA/NORTHERN BOLIVIA TO
CENTRAL PERU. SCATTERED DEEP CONVECTION WAS BUILDING ALONG THIS
BOUNDARY.
URRA...DMC (CHILE)
MOREYRA...SENAMHI PERU
DAVISON...HPC (USA)
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