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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1306Z Sep 05, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
906 AM EDT FRI SEP 05 2014

GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/

SYNOPSIS (VALID FROM SEPTEMBER 05 AT 00UTC): AT 200 HPA...RIDGE
PATTERN OVER THE CONTINENT GRADUALLY BECOMING BETTER ORGANIZED...
WITH AXIS BUILDING ACROSS NORTHERN SOUTH AMERICA TO PERU/BRASIL.
THIS IS NOW IN PHASE WITH ANOTHER RIDGE TO THE SOUTH THAT EXTENDS
FROM EASTERN BOLIVIA/MATO GROSSO IN BRASIL...ACROSS RIO DE LA
PLATA BASIN TO THE SOUTH GEORGIA ISLANDS. RIDGE ALOFT IS VENTING
DEEP CONVECTION ACROSS ACRE-AMAZONAS IN BRASIL TO THE PERUVIAN
JUNGLE. FURTHERMORE...BUILDING UPPER LEVEL RIDGE IS INDUCING THE
NORTHWARD AMPLIFICATION OF A TROUGH ALONG 20S 40W...TO NORTHEAST
STATES OF BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
55S 103W...THEN ALONG 61S 95W...EXITING AT 63S 78W. THE NORTHERN
POLAR LIES ALONG A 157KT MAXIMUM AT 33S 120W...A 157KT MAXIMUM AT
38S 110W...A 131KT MAXIMUM AT 40S 100W...40S 94W...EXITING AT 29S
86W. IT REFORMS AT 28S 79W...ALONG 31S 73W...EXITING AT 37S 67W.
IT REFORMS AT 41S 63W...ALONG 44S 52W...36S 43W...26S 37W...25S
31W...A 139KT MAXIMUM AT 31S 18W...AND A 161KT MAXIMUM AT 34S 05W.
THE SUBTROPICAL JET HAS ITS ENTRANCE AT 21S 78W...ALONG 25S 70W...
EXITING AT 31S 60W. IT REFORMS AT 32S 58W...ALONG 34S 54W...25S
43W...EXITING AT 20S 38W.

AT 500 HPA...A HIGH NEAR 19S 108W EXTENDS A RIDGE ALONG 30S
105W...40S 95W...TO 50S 90W. A TROUGH LIES TO THE EAST...EXTENDING
BETWEEN 90W-60W AND TO THE SOUTH OF 20S...WHILE CENTERING ON A
CLOSED LOW NEAR 37S 82W. THE TROUGH IS FOCUSING SHORT WAVE ENERGY
ACROSS CENTRAL CHILE TO ARGENTINA...WHERE IT PROVIDES DYNAMICAL
SUPPORT TO DEEP CONVECTION. A NORTH TO SOUTH RIDGE TO THE EAST
EXTENDS ALONG 20S 50W...40S 52W...TO THE MALVINAS/FALKLAND
ISLANDS. EAST OF THIS RIDGE...A TROUGH EXTENDS ALONG 40S 10W...30S
30W...TO 24S 40W.

AT LOW LEVELS...A TROUGH ON THE NORTHERN STREAM DOMINATES THE FAR
EASTERN PACIFIC WHILE ANCHORING ON AN OCCLUDED 1006 HPA LOW AT 37S
81W. THIS SUSTAINS A POLAR FRONT THAT EXTENDS ALONG A 1018 HPA LOW
AT 53S 50W...47S 54W...45S 59W...41S 64W...A 1014 HPA LOW AT 39S
66W...37S 63W...34S 62W...A 1010 HPA LOW AT 34S 65W...MENDOZA IN
ARGENTINA...WEAKENING OVER THE EASTERN PACIFIC. THIS SUSTAINS
SCATTERED CONVECTION. OTHER ACTIVITY TO THE NORTH CLUSTERS ALONG A
TROUGH FROM CHACO ARGENTINO TO RIO GRANDE DO SUL IN BRASIL. A
RIDGE OVER THE WESTERN ATLANTIC CENTERS ON A MASSIVE 1037 HPA HIGH
AT 41S 44W. NORTH OF THIS AXIS...A POLAR FRONT LIES ALONG A 1010
HPA LOW AT 22S 24W...20S 29W...A 1014 HPA LOW AT 19S 31W...TO
ESPIRITO SANTO IN BRASIL...WHERE IT SUSTAINS SCATTERED CONVECTION.

CAROCA...DMC (CHILE)
JALFIN...SMN (ARGENTINA)
DAVISON...WPC (USA)