739
FXSA20 KWBC 311304
PMDSA
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
903 AM EDT THU MAY 31 2012
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
SYNOPSIS (VALID FROM 00UTC MAY 31): NORTH OVER THE CONTINENT...AT
200 HPA...A RIDGE NOW EXTENDS TO THE NORTH OF 20S AND WEST OF
70W. THIS IS VENTING LATE AFTERNOON/EVENING CONVECTION ACROSS
BRASIL TO THE NORTH OF 06S...WITH CELLS SPREADING WEST INTO
SOUTHERN COLOMBIA/NORTHERN PERU. ALSO AT UPPER LEVELS...A SHORT
WAVE TROUGH LIES ALONG THE SOUTHERN COAST OF PERU WHILE CENTERING
ON A CLOSED LOW NEAR 14S 77W.
AT 200 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH
ENTRANCE AT 60S 98W...ALONG 54S 79W...EXITING AT 45S 61W. THE
NORTHERN POLAR LIES ALONG 30S 120W...A 155KT MAXIMUM AT 31S
110W...34S 101W...A 131KT MAXIMUM AT 41S 93W...45S 81W...A 129KT
MAXIMUM AT 44S 72W...41S 64W...A 145KT MAXIMUM AT 37S 56W...34S
46W...A 170KT MAXIMUM AT 38S 35W...A 167KT MAXIMUM AT 43S
24W...AND 45S 11W. THE SUBTROPICAL JET LIES ALONG 25S 120W...26S
106W...32S 91W...35S 80W...EXITING AT 32S 73W. IT REFORMS AT 31S
63W...ALONG 28S 46W...33S 30W...EXITING AT 38S 17W. THE
SUBTROPICAL JET HAS A FINGER TO THE NORTH BETWEEN 15S 52W AND 14S
44W.
AT 500 HPA...A BROAD TROUGH OVER THE SOUTH PACIFIC EXTENDS
BETWEEN 140W-90W AND TO THE SOUTH OF 20S. THIS IS PRESSING
AGAINST A BLOCKING RIDGE TO THE EAST AS THE LATTER EXTENDS SOUTH
ALONG 80W/90W TO 60S. EAST OF THIS AXIS...ANOTHER TROUGH EXTENDS
OVER THE SOUTH ATLANTIC BETWEEN 70W-20W AND TO THE SOUTH OF 25S.
THE TROUGH CENTERS ON A CLOSED LOW NEAR 52S 44W...AND IT IS
FOCUSING SHORT WAVE ENERGY ACROSS SOUTHERN-CENTRAL ARGENTINA...
WITH A STRONG VORTEX NEARING THE FALKLAND ISLANDS/MALVINAS.
A BROAD TROUGH OVER THE PACIFIC ANCHORS ON AN OCCLUDED 974 HPA
LOW AT 46S 111W. MULTIPLE FRONTS ARE REVOLVING AROUND THIS AXIS
WHILE SLOWLY PUSHING EAST TOWARDS THE SOUTHERN CONE OF SOUTH
AMERICA. THE TROUGH...MEANWHILE...CONTINUES TO PRESS AGAINST A
BLOCKING RIDGE TO THE EAST. THE RIDGE CENTERS ON THREE HIGHS...A
1021 HPA AT 29S 85W...A 1023 HPA HIGH AT 43S 73W...AND A 1021 HPA
HIGH AT 55S 81W. FARTHER EAST...A BROAD TROUGH DOMINATES THE FLOW
ACROSS THE SOUTH ATLANTIC AS IT CENTERS ON AN OCCLUDED 974 HPA
LOW AT 53S 35W. POLAR FRONTS REVOLVE AROUND THIS TROUGH...WITH
ONE EXTENDING ALONG A 998 HPA LOW AT 51S 60W TO CENTRAL
PATAGONIA. FARTHER NORTH...AN ELONGATED FRONT LIES ALONG A 1006
HPA LOW AT 33S 32W...27S 41W...SAO PAULO TO PARAGUAY. ISOLATED TO
SCATTERED RAINFALL WAS NOTED ALONG THIS BOUNDARY. A POLAR RIDGE
TO THE SOUTH CENTERS ON A 1021 HPA HIGH AT 31S 63W.
PARRENO...INAMHI (ECUADOR)
VILLELA...INMET (BRASIL)
DAVISON...HPC (USA)
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