980
FXSA20 KWBC 081353
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
953 AM EDT TUE JUL 08 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z JUL 08). THE 200 HPA ANALYSIS SHOWS A
TROUGH DOMINATING THE CONTINENT EXTENDING NORTHWARD FROM
ANTARCTIC THROUGH CENTRAL ARGENTINA...BOLIVIA...AND INTO WESTERN
AMAZONIA. THERE A RIDGE OVER THE TROPICAL ATLANTIC THAT EXTENDS
INLAND INTO NORTHEAST BRASIL WHILE OVER THE PACIFIC THERE AN
ANTICYCLONE CENTERED OFF THE COAST OF CENTRAL PERU NEAR 13S 91W.
JET ANALYSIS AT 250 FINDS THE SUBTROPICAL JET ENTERING 29S
147W...30S 132W...EXITING 26S 128W. IT REFORMS 19S 122W...26S
104W...31S 83W...EXITING 23S 71W. IT REFORMS OVER THE ATLANTIC AT
16S 26W AND CONTINUES 22S 15W WITH 152 KNOTS MAXIMA 27S 5W.. AND
EXITS 26S 7E. THE NORTH POLAR JET ENTER AT 38S 144W WITH 159 KNOT
MAXIMA AT 39S 140W...CONTINUES ALONG 39S 127W TO 144 KNOT MAXIMA
AT 38S 122W...CONTINUES 31S 122W...32S 104W...160 KNOT MAXIMA AT
37S 87W... 38S 76W AND EXITS OVER CUYO. IT REFORMS OVER LITTORAL
AND CONTINUES SOUTHEAST ACROSS URUGUAY AND 36S 53W...40S
44W...39S 34W...EXITING 34S 27W. IT REFORMS AT 30S 12W...30S
3W...30S 7E. THE SOUTH POLAR JET IS FOUND 70S 106W... ALONG 68S
95W AND EXITS 61S 91W. IT REFORMS WELL NORTH OFF THE COAST OF
PERU AT 42S 99W...TO 137 KNOT MAXIMA AT 44S 86W... CROSSES
SOUTHERN PERU AND PATAGONIA THEN INTO THE ATLANTIC ALONG 44S
63W... EXITING 50S 48W. IT REFORMS 52S 66W... 57S 57W...61S
47W...WITH 138 KNOT MAXIMA 66S 34W AND EXITS 67S 27W. THERE IS A
FINGER TO THE NORTH ALONG 47S 34W...42S 28W...EXITING 41S 26W. IT
REFORMS 56S 21W...ALONG 58S 13W AND EXITS 57S 8W.
AT 500 HPA...THERE IS A VORTEX EAST OF THE ANTARCTIC PENINSULA
RIDGE CENTERED NEAR 71S 41W WITH TROUGH EXTENDING NORTHWEST
ACROSS THE DRAKE PASSAGE AND INTO EXTREME SOUTHERN CHILE AND
ARGENTINA ACCOMPANIED BY NUMEROUS EMBEDDED VORTICITY MAXIMA. OVER
THE SOUTHERN ATLANTIC THERE IS A DEVELOPING CYCLONE NEAR 48S 25W.
IN THE NORTHERN STREAM THERE IS A SHORTWAVE TROUGH WELL OFF THE
COAST OF PERU CENTERED NEAR 36S 108W. JUST SOUTH OF BUENO AIRES
THERE IS A SHORTWAVE IMPULSE WITH TROUGH EXTENDING NORTHWEST
ACROSS NORTHERN ARGENTINA AND INTO EXTREME SOUTHERN BOLIVIA. A
LOBE OF VORTICITY EXTENDS ALONG THE AXIS OF THIS TROUGH FROM THE
MAIN VORT CENTERED AT 38S 56W.
AT THE SURFACE THERE IS A 1006 HPA LOW SOUTH OF BUENOS AIRES AT
39S 55W WITH OCCLUSION ALONG 35S 56S...37S 60W...40S 56W...COLD
FRONT 39S 53W...31S 52W...27S 56W...1013 HPA WAVE 25S 58W...COLD
FRONT 23S 58W...18S 61W...15S 65W. OVER THE SOUTH ATLANTIC THERE
ARE TWO HIGHS... 1033 HPA AT 42S 35W... AND 1039 HPA AT 43S 7W
SEPARATED BY A 1006 HPA CUT OFF LOW AT 50S 24W. FROM THIS SYSTEM
EXTENDS A STATIONARY BOUNDARY ALONG 47S 21W...40S 21W...34S
29W...35S 40W...THEN WARM FRONT ALONG 37S 43W...41S 50W LINKING
WITH THE SURFACE CYCLONE SOUTH OF BUENOS AIRES. OVER THE DRAKE
PASSAGE AND IN THE VICINITY OF THE ANTARCTIC PENINSULA THERE IS A
VARIETY OF MATURE OCCLUDED SYSTEMS WITH ONE JUST SOUTH OF TIERRA
DEL FUEGO AT 59S 67W...WITH COLD FRONT ALONG 57S 67W...55S 78W...
AND WARM FRONT 56S 67W...53S 71W. THERE IS AN OCCLUDED LOW WEST
OF THE ANTARCTIC PENINSULA AT 73S 34W WITH OCCLUSION ALONG 70S
30W...73S 42W...COLD FRONT 68S 21W...64S 29W...WAVE AT 61S
40W...COLD FRONT 59S 42W...55S 51W...WAVE AT 52S 58W...COLD FRONT
49S 63W...TERMINATING INLAND OVER SOUTH CENTRAL PATAGONIA AT 45S
70W. IMMEDIATELY TO THE NORTH THERE IS A BOUNDARY ASSOCIATE WITH
A LOW AT 45S 65W THAT EXTENDS ACROSS PATAGONIA AND CENTRAL CHILE
TO A LOW AT 41S 75W...COLD FRONT 38S 77W...36S 84W...36S
89W...WARM FRONT 36S 93W... 1010 HPA LOW AT 36S 96W...COLD FRONT
34S 96W...WAVE AT 29S 103W..COLD FRONT 26S 107W...23S 112W...19S
121W...17S 128W. THERE IS A TRIO OF ANTICYCLONES OVER THE SOUTH
PACIFIC...ONE A 1027 HPA ANTICYCLONE AT 57S 107W... ANOTHER 1023
HPA AT 27S 129W AND THE THIRD A 1025 HPA AT 30S 82W. IN THE
CENTER OF THESE ANTICYCLONES IS A WEAK 1005 HPA CYCLONE AT 37S
108W WITH COLD FRONT 35S 107W...31S 110W AND WARM FRONT 34S
105W...32S 105W. THE ITCZ EXTENDS FROM THE TROPICAL ATLANTIC
ACROSS THE CONTINENT INTO THE PACIFIC AND LIES BETWEEN 5 AND 7
NORTH IN THE ATLANTIC AND BETWEEN 8 AND 13 NORTH IN THE PACIFIC.
COLMAN...DMH (PARAGUAY)
GUZMAN...SENAMHI (BOLIVIA)
ROBSON......HPC (USA)
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