SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
853 AM EDT THU JUL 02 2009
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/
 
LAST NO AMENDS... NEXT BULLETIN ON JULY 06.

SYNOPSIS (VALID FROM 00Z JUL 02). AT 200 HPA A HIGH NEAR 03S 43W
EXTENDS A RIDGE WEST ACROSS NORTHERN BRASIL ALONG 03S...
TRAVERSING NORTHERN PERU INTO THE EASTERN TROPICAL PACIFIC. THIS
IS VENTING DEEP CONVECTION TO THE NORTH OF 03S...WITH MOST
INTENSE NOTED OVER THE GUIANAS-VENEZUELA-COLOMBIA. ISOLATED TO
SCATTERED DEEP CONVECTION WAS BUILDING ACROSS PARA-AMAZONAS IN
BRASIL TO THE NORTHERN JUNGLE OF PERU/EASTERN ECUADOR.

THE 250 HPA JET ANALYSIS SHOWS A FINGER OF THE SOUTHERN POLAR
WITH ENTRANCE AT 40S 102W...ALONG 48S 93W...EXITING AT 42S 75W.
IT REFORMS FARTHER EAST NEAR 52S 37W...ALONG 51S 16W...AND 42S
04W. THE NORTHERN POLAR LIES ALONG 35S 120W...A 145KT MAXIMUM AT
35S 109W...EXITING AT 36S 94W. IT REFORMS AT 38S 86W...ALONG 35S
71W...31S 62W...32S 52W...A 150KT MAXIMUM AT 37S 40W...36S
25W...AND 38S 12W. A 162KT MAXIMUM WAS ANALYZED OVER SOUTHERN
BRASIL NEAR 30S 51W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT 15S
112W...ALONG 31S 91W...A 145KT MAXIMUM AT 25S 72W...ASUNCION...
25S 54W...28S 39W...27S 16W...AND 26S 05W.

AT 500 HPA...A BROAD TROUGH EXTENDS BETWEEN 125W-90W AND TO THE
SOUTH OF 25S...CENTERING ON A CLOSED LOW AT 50S 114W. ON THE
NORTHERN STREAM...AN INDUCED RIDGE TO THE EAST EXTENDS SOUTH
ALONG 85W...WHILE ON THE SOUTHERN STREAM A RIDGE CENTERS ON A
CLOSED HIGH NEAR 61S 109W. FARTHER EAST...OVER THE CONTINENT...A
LOW AMPLITUDE TROUGH EXTENDS BETWEEN 80W-55W AND TO THE SOUTH OF
20S...WITH SHORT WAVE VORTICES STREAMING ACROSS SOUTHERN/CENTRAL
CHILE AND ACROSS THE BUENOS AIRES PROVINCE. OVER THE ATLANTIC...
A LOW AMPLITUDE TROUGH DOMINATES THE SOUTHERN STREAM FLOW...WITH
PERTURBATIONS LIFTING NORTH ALONG THE EASTERN PORTIONS OF THE
ANTARCTIC PENINSULA/WEDDELL SEA. ON THE NORTHERN STREAM...A LOW
NEAR 42S 41W ANCHORS A WANING TROUGH THAT EXTENDS BETWEEN 48W-
30W.

AT LOW LEVELS A BROAD TROUGH OVER THE PACIFIC CENTERS ON A DEEP
950 HPA LOW AT 51S 113W. FARTHER EAST...A LOW AMPLITUDE TROUGH
LIES OVER THE SOUTHERN CONE...WITH AN OCCLUDED 990 HPA LOW AT 51S
79W. AN OCCLUDED 1000 HPA LOW AT 43S 76W EXTENDS A FRONT ALONG A
1006 HPA LOW AT 46S 70W...ACROSS PATAGONIA-LA PAMPA-SOUTHERN
CUYO...TO A 1018 HPA LOW AT 35S 78W. MODERATE RAINFALL AMOUNTS
WERE NOTED BETWEEN TEMUCO/CONCEPCION AND PUERTO MONTT CHILE. A
NEGATIVELY TILTED FRONT TO THE EAST ORIGINATES ON A 998 HPA LOW
AT 53S 67W...ALONG 41S 56W...RIO DE LA PLATA TO 27S 63W. A RIDGE
ON THE NORTHERN STREAM CENTERS ON TWO HIGHS...A 1023 HPA HIGH AT
28S 81W AND A 1019 HPA HIGH AT 33S 64W. A BROAD TROUGH OVER THE
ATLANTIC CENTERS ON A 982 HPA OCCLUDED LOW AT 42S 40W...WITH A
FRONT ALONG 35S 40W...42S 49W...47S 38W...A 1004 HPA LOW AT 40S
28W...31S 26W...A 1014 HPA LOW AT 30S 33W...24S 39W...SAO
PAULO/NORTHERN PARAGUAY TO CENTRAL BOLIVIA. SCATTERED CONVECTION
WAS NOTED ALONG THIS FRONT WITH MOST INTENSE OVER BRASIL.

MAZA...SMN (ARGENTINA)
SEABRA...INMET (BRASIL)
DAVISON...HPC (USA)