369
FXSA20 KWBC 131339
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
939 AM EDT WED AUG 13 2008
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00Z AUG 13). UPPER LEVEL ANALYSIS SHOWS AN
EAST TO WEST RIDGE OVER THE EASTERN PACIFIC AND NORTHERN SOUTH
AMERICA INTO THE ATLANTIC. AT 200 HPA A CLOSED CELL OF THE
SUBTROPICAL RIDGE CENTERS ON A HIGH NEAR 13S 84W WITH A RIDGE
EXTENDING EAST ACROSS PERU. A SECOND CLOSED CELL IS CENTERED NEAR
08S 35W. A RIDGE EXTENDS ACROSS NORTHERN BRASIL THROUGH THE
ANTICYCLONE THEN EAST INTO THE ATLANTIC OCEAN. A COL ALONG 72/73W
SEPARATES THESE RIDGES. THE RIDGE ALOFT IS VENTING DEEP
CONVECTION ACROSS AMAZONIA-PARA IN WESTERN BRASIL...WITH
CONVECTION BUILDING IN CLUSTERS.
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
63S 120W... 61S 91W... TO AN INFECTION POINT AT 59S 69W... TO AN
EXIT AT 53S 70W. JET REFORMS AT 44S 82W AND EXTENDS ALONG 42S 65W
TO AN EXIT AT 42S 50W. THE JET REFORMS 44S 46W AND EXTENDS TO A
122 KT MAXIMA AT 44S 41W THEN TO 52S 40W TO A 181 KT MAXIMA AT
57S 30W TO 50S 08W TO AN EXIT 39S 04W. THE NORTHERN POLAR HAS
ITS ENTRANCE AT 42S 109W AND EXTENDS ALONG 40WS 103W TO AN EXIT
AT 38S 97S. JET REFORMS AT 34S 93W AND EXTENDS ALONG 38S 81W TO
36S 71W. IT REFORMS AT 36S 56W AND EXTENDS ALONG 38S 44W... 48S
28W TO 39S 12W. THE SUBTROPICAL JET LIES ALONG 23S 120W... 29S
92W... 24S 72W... TO 22S 55W. THE JET REFORMS AT 23S 27W AND
EXTENDS ALONG 24S 09W.
AT 500 HPA...A RIDGE IN THE SOUTHERN STREAM ORIGINATES IN A
CLOSED HIGH NEAR 41S 121W AND EXTENDS SOUTHEAST TO 54S 110W THEN
EAST TO THE SOUTHERN TIP OF CHILE THEN SOUTHEAST TO NEAR 60S 65W.
NORTH OF THIS RIDGE... A TROUGH EXTENDS FROM 44S 98W TO 46S 80W
ACROSS THE SOUTHERN CONE TO NEAR 50S 69W TO 58S 53W. FARTHER EAST
OVER THE SOUTH ATLANTIC... A TROUGH EXTENDS NORTH NORTHWEST FROM
51S 41W TO 38S 48W. EAST OF THIS TROUGH... A RIDGE EXTENDS ALONG
22W/25W SOUTH OF 30S.
AT THE SURFACE... OVER THE PACIFIC A 1041 HPA HIGH IS CENTERED
NEAR 50S 100W. ANOTHER 1019 HIGH IS CENTERED NEAR 22S 89W. A
1002 HPA LOW IS CENTERED AT 36S 90W WITH A 1006 HPA TRIPLE POINT
NEAR 38S 89W. A COLD FRONT EXTENDS FROM THE TRIPLE POINT ALONG
35S 85W TO 28S 90W. A 998 LOW IS CENTERED NEAR 48S 63W WITH A
994 HPA TRIPLE POINT NEAR 50S 58W. A COLD FRONT EXTENDS ALONG 44S
71W TO 42S 71W. A 984 HPA LOW NEAR 45S 40W WITH A 980 HPA TRIPLE
POINT IS CENTERED AT 47S 37W. A COLD FRONT EXTENDS FROM THE
TRIPLE POINT ALONG 37S 40W TO 30S 44W. A 1037 HPA HIGH IS
CENTERED NEAR 36S 17W.
GUZMAN...SENAMHI (BOLIVIA)
URRA...DMC (CHILE)
DANAHER...HPC (USA)
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