SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
848 AM EST TUE FEB 09 2010
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
 
SYNOPSIS (VALID FROM 00Z FEB 09). THE ANALYSIS AT 200 HPA SHOWS A
CLOSED HIGH OVER THE CONTINENT NEAR 20S 79W...ANCHORING A RIDGE
ACROSS BOLIVIA-PARAGUAY-SOUTHERN BRASIL. A TUTT LOW NEAR 20S 46W
EXTENDS A TROUGH TO THE NORTHWEST ACROSS SOUTHERN PARA IN BRASIL
TO AMAZONAS. THE TROUGH FAVORS ORGANIZED DEEP CONVECTION OVER
BRASIL TO THE EAST OF 53W AND NORTH OF 16S. THE RIDGE...
MEANWHILE...IS VENTING WIDELY SCATTERED CONVECTION ACROSS PARA-
AMAZONAS-RONDONIA AND MATO GROSSO IN BRASIL.

THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG 58S
120W...50S 89W...57S 68W....A 140KT MAXIMUM AT 54S 59W...EXITING
AT 50S 51W. A FINGER OF THE SOUTHERN POLAR LIES BETWEEN 52S 46W
AND 61S 44W. IT REFORMS AT 57S 35W...ALONG A 150KT MAXIMUM AT 43S
15W...AND 41S 05W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 50S
117W...ALONG 51S 103W...A 150KT MAXIMUM AT 47S 93W...47S
81W...51S 68W...A 145KT MAXIMUM AT 47S 56W...37S 50W...A 163KT
MAXIMUM AT 40S 44W...A 168KT MAXIMUM AT 45S 28W...A 172KT MAXIMUM
AT 42S 21W...AND 38S 08W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
45S 103W...ALONG 43S 87W...PUERTO MONTT CHILE...EXITING AT 41S
66W. IT REFORMS AT 40S 61W...THEN ALONG 31S 51W...36S 38W...38S
28W...EXITING AT 33S 14W.

AT 500 HPA...A PROGRESSIVE TROUGH IS MOVING TOWARDS THE SOUTHERN
CONE...AS IT ORIGINATES ON A CLOSED LOW AT 56S 85W...ALONG 45S
90W...TO 37S 95W. THE DEEP TROUGH PATTERN SUSTAINS AN INDUCED
RIDGE ACROSS PATAGONIA IN ARGENTINA. FARTHER EAST...OVER THE
WESTERN ATLANTIC...A TROUGH EXTENDS BETWEEN 60W-35W AND TO THE
SOUTH OF 30S. AN ELONGATED CYCLONIC VORTICITY TONGUE EXTENDS
ALONG THE NORTHERN PERIPHERY OF THIS TROUGH TO RIO GRANDE DO SUL
BRASIL-CHACO ARGENTINO. A LONG WAVE RIDGE TO THE EAST LIES ALONG
30S 25W...50S 27W...THE WEDDELL SEA/ANTARCTIC PENINSULA.

THE SURFACE ANALYSIS SHOWS A RIDGE ON THE NORTHERN STREAM OVER
THE EASTERN PACIFIC...CENTERING ON A 1025 HPA HIGH AT 33S 98W. AN
ELONGATED FRONT LIES TO THE SOUTH...ORIGINATING ON A DEEP 950 HPA
LOW AT 55S 83W...ALONG 51S 82W...55S 88W...A 958 HPA LOW AT 57S
77W...54S 70W...SOUTHERN PATAGONIA...46S 72W...A 992 HPA LOW AT
48S 78W...42S 83W...39S 92W...39S 101W...TO A 1010 HPA TRIPLE
POINT LOW AT 42S 110W. SCATTERED CONVECTION WAS NOTED OVER THE
SOUTHERN CONE. A BROAD TROUGH LIES OVER THE WESTERN
ATLANTIC...WITH A POLAR FRONT EXTENDING FROM A 970 HPA LOW AT 50S
41W...ALONG 52S 42W...48S 35W...A 996 HPA LOW AT 41S 36W...34S
35W...30S 40W...30S 47W...SOUTHERN BRASIL TO PARAGUAY/NORTHERN
ARGENTINA WHERE IT BECOMES DIFFUSE. SCATTERED CONVECTION WAS
NOTED OVER MID SECTIONS OF SOUTH AMERICA.

LLANQUE...SENAMHI (BOLIVIA)
DAVISON...HPC (USA)!