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South American Synoptic Discussion
 
(Latest Discussion - Issued 1422Z Mar 04, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
922 AM EST WED MAR 04 2015

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

SYNOPSIS (VALID FROM MARCH 04 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS THE SUBTROPICAL RIDGE TRAVERSING THE CONTINENT FROM PERU TO
THE SOUTHERN STATES OF BRASIL...WHILE ANCHORING ON A CLOSED HIGH
OVER THE ALTIPLANO DE BOLIVIA. EAST OF THIS RIDGE...A TROUGH
EXTENDS TO THE NORTH-NORTHWEST FROM A CLOSED LOW AT 29S 35W TO
NORTHEAST STATES OF BRASIL. MOST ACTIVE CONVECTION IS BUILDING
BETWEEN THE RIDGE AND THE TROUGH...AFFECTING CONTINENTAL AREA TO
THE NORTH OF 20N AND WEST OF 50W.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
48S 107W...THEN ALONG 49S 94W...EXITING AT 50S 83W. IT REFORMS AT
53S 75W...CROSSING 53S 40W...59S 23W...AND A 140KT MAXIMUM AT 59S
10W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 48S 120W...THEN ALONG
A 153KT MAXIMUM AT 42S 110W...A 139KT MAXIMUM AT 45S 94W...EXITING
AT 44S 86W. IT REFORMS AT 45S 79W...ALONG 59S 65W...49S 36W...52S
11W...AND 41S 02E. THE SUBTROPICAL JET HAS ITS ENTRANCE AT 29S
80W...THEN ALONG 36S 65W...A 133KT MAXIMUM AT 43S 50W...EXITING AT
44S 36W.

AT 500 HPA...TIGHT BELT OF MID LATITUDE WESTERLIES DOMINATES THE
EASTERN PACIFIC-SOUTHERN CONE OF SOUTH AMERICA...WITH PROGRESSIVE
SHORT WAVE PERTURBATIONS STREAMING ACROSS SOUTHERN CHILE-PATAGONIA
IN ARGENTINA. EMBEDDED IN THIS FLOW...A STRONG/DEEP TROUGH NOW
EXTENDS BETWEEN 115W-100W TO 38S. OTHER SHORT WAVE PERTURBATIONS
POPULATE THE NORTHERN STREAM FLOW...WITH ONE ALONG 85W TO
27S...WHILE ANOTHER PULLS ACROSS THE BUENOS AIRES PROVINCE/RIO DE
LA PLATA BASIN.

AT LOW LEVELS...RIDGE ON THE NORTHERN STREAM EXTENDS OVER THE
EASTERN PACIFIC WHILE CENTERING ON A 1021 HPA HIGH AT 30S 98W. A
BROAD TROUGH LIES TO THE SOUTH...ANCHORING ON A 974 HPA LOW AT 59S
106W. AN ELONGATED FRONT BOUNDS THE NORTHERN PERIPHERY OF THIS
TROUGH...AS IT EXTENDS FROM A 986 HPA LOW AT 55S 62W...53S 63W...A
994 HPA LOW AT 51S 68W...46S 74W...A 1000 HPA LOW AT 49S 79W...46S
88W...A 998 HPA LOW AT 46S 96W...43S 97W...TO A 1002 HPA LOW AT
42S 100W. ANOTHER FRONT TO THE EAST EXTENDS ALONG A 966 HPA LOW AT
57S 25W...48S 30W...45S 35W...43S 52W...LA PAMPA-SOUTHERN CUYO TO
A 1016 HPA LOW AT 37S 74W. A TROUGH TO THE NORTH EXTENDS FROM
URUGUAY/RIO GRANDE DO SUL TO NORTHWEST ARGENTINA. MOISTURE
CLUSTERS ALONG THIS AXIS...FAVORING SCATTERED DEEP CONVECTION.
FARTHER EAST...A BROAD RIDGE OVER THE ATLANTIC CENTERS ON A 1029
HPA HIGH AT 38S 13W.

ARREAGA...INAMHI (ECUADOR)
SCHNEIDER...INMET (BRASIL)
DAVISON...WPC (USA)