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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1301Z Apr 04, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
901 AM EDT FRI APR 04 2014

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

SYNOPSIS (VALID FROM 00 UTC APR 04): NORTH OVER THE CONTINENT...AT
200 HPA...THE ANALYSIS SHOWS BROAD CELL OF THE SUBTROPICAL RIDGE.
IT ANCHORS ON A CLOSED HIGH OVER SANTA CRUZ IN EASTERN BOLIVIA.
THE SUBEQUATORIAL RIDGE TO THE NORTH...MEANWHILE...ORIGINATES ON A
CLOSED HIGH NEAR 05S 35W...WITH AXIS WEST ACROSS THE
GUIANAS-VENEZUELA TO COLOMBIA. THIS IS VENTING DEEP CONVECTION
ALONG THE ATLANTIC ITCZ...WITH CELLS CLUSTERING ALONG THE NORTH
COAST/ NORTHEAST STATES OF BRASIL. OTHER ACTIVITY TO THE WEST IS
BUILDING ALONG A TROUGH ACROSS MATO GROSSO-RONDONIA-ACRE IN BRASIL
TO CENTRAL/NORTHERN JUNGLE OF PERU.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
57S 116W...ALONG 68S 91W...65S 66W...A 135KT MAXIMUM AT 61S
59W...54S 50W...51S 37W...EXITING AT 47S 26W. THE NORTHERN POLAR
HAS ITS ENTRANCE AT 29S 83W...ALONG 37S 73W...42S 63W...41S
51W...EXITING AT 36S 36W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
21S 85W...ALONG 26S 79W...A 126KT MAXIMUM AT 32S 69W... SOUTHERN
URUGUAY...EXITING AT 25S 43W.

AT 500 HPA...THE MID LEVEL ANALYSIS SHOWS A RIDGE WITH AXIS TO THE
SOUTHEAST ALONG 30S 105W...A CLOSED HIGH AT 47S 91W...TO THE
BELLINGSHAUSEN SEA. THE RIDGE UNDERCUTS A CUTOFF LOW TO THE
NORTH...AS THE LATTER MEANDERS OFF THE CENTRAL COAST OF CHILE NEAR
40S 75W. THIS IS SHEARING SHORT WAVE ENERGY ACROSS THE CENTRAL
ANDES OF CHILE TO CENTRAL ARGENTINA...WHERE IT CONTINUES TO
SUSTAIN SCATTERED CONVECTION. ANOTHER RIDGE LIES TO THE
NORTH...EXTENDING FROM BOLIVIA-PARAGUAY TO SOUTHERN BRASIL...WHERE
IT TENDS TO SUSTAIN A MID LEVEL CAP INVERSION. EAST OVER THE SOUTH
ATLANTIC...BROAD TROUGH EXTENDS TO THE WEST OF 60W...WITH SHORT
WAVE VORTICES STREAMING ACROSS THE WEDDELL SEA-SOUTH GEORGIA
ISLANDS.

THE SURFACE ANALYSIS SHOWS A RIDGE OVER THE FAR EASTERN
PACIFIC...WITH AXIS CENTERING ON A 1029 HPA HIGH AT 47S 91W. A
BROAD TROUGH TO THE EAST LIES ACROSS THE SOUTH ATLANTIC. POLAR
FRONTS REVOLVE AROUND THIS AXIS...WITH ONE THAT EXTENDS ALONG A
984 HPA LOW AT 55S 43W...49S 54W...TO 50S 67W. AN OLD BOUNDARY TO
THE NORTH LIES ALONG A 1012 HPA LOW AT 37S 16W...33S 19W...28S
29W...26S 36W...29S 49W...COAST OF URUGUAY/BUENOS AIRES PROVINCE
TO A 1016 HPA LOW AT 40S 61W TO NEUQUEN IN SOUTHERN CUYO.
SCATTERED DEEP CONVECTION WAS BUILDING ALONG/NORTH OF THIS
BOUNDARY. A RIDGE ON THE NORTHERN STREAM CENTERS ON A 1025 HPA
HIGH AT 36S 44W.

ITA...SENAMHI (PERU)
FERNANDES...INMET (BRASIL)
DAVISON...WPC (USA)