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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1430Z Dec 18, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
930 AM EST THU DEC 18 2014

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

SYNOPSIS (VALID FROM DECEMBER 18 AT 00UTC): AT 200 HPA...THE
SUBTROPICAL RIDGE CENTERS ON A CLOSED HIGH OVER BOLIVIA NEAR 18S
66W...AS IT EXTENDS ACROSS THE CONTINENT TO THE NORTH OF 30S. A
TROUGH TO THE EAST EXTENDS NORTH-NORTHWEST ALONG 30S 30W...A LOW
AT 19S 34W...TO NORTHEAST BRASIL. RIDGE ALOFT IS VENTING DEEP
CONVECTION ACROSS THE CENTRAL STATES OF BRASIL-BOLIVIA AND THE
JUNGLE OF PERU. THE TROUGH TO THE EAST...MEANWHILE...IS ENHANCING
CONVECTION ACROSS NORTHEAST BRASIL.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS ALONG
50S 120W...A 175KT MAXIMUM AT 53S 109W...52S 74W...52S
68W...EXITING AT 48S 61W. IT REFORMS AT 50S 45W...ALONG A 122KT
MAXIMUM AT 55S 20W...AND 53S 05W. THE NORTHERN POLAR LIES ALONG
47S 120W...49S 106W...EXITING AT 45S 86W. IT REFORMS AT 42S
49W...ALONG 43S 40W...44S 21W...AND 43S 01W. THE SUBTROPICAL JET
TO THE NORTH HAS ITS ENTRANCE AT 27S 81W...THEN ALONG 29S
71W...32S 51W...EXITING AT 31S 37W. IT HAS A FINGER TO THE NORTH
BETWEEN 22S 36W AND 16S 38W.

AT 500 HPA...A RIDGE EXTENDS ON THE NORTHERN STREAM BETWEEN
130W-90W AND TO THE NORTH OF 45S...WHILE ANCHORING ON A CLOSED
HIGH NEAR 36S 113W. PERTURBATIONS ON THE SOUTHERN STREAM PRESS
AGAINST THE RIDGE OT THE NORTH...FAVORING A TIGHT BELT OF MID
LATITUDE WESTERLIES ACROSS THE SOUTHEAST PACIFIC TO TIERRA DEL
FUEGO/SOUTHERN CHILE. EMBEDDED IN THIS FLOW...TWO STRONG
PERTURBATIONS ARE INITIALIZED... WITH ONE ALONG 110W AND THE OTHER
ALONG 85W. FARTHER EAST...A BROAD TROUGH EXTENDS ACROSS THE
WESTERN ATLANTIC...WITH AXIS SPANNING BETWEEN 65W-40W AND TO THE
SOUTH OF 30S. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS MID
SECTIONS OF SOUTH AMERICA...PROVIDING DYNAMICAL SUPPORT TO DEEP
CONVECTION TO THE NORTH.

AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A RIDGE ON THE NORTHERN
STREAM OVER THE EASTERN PACIFIC THAT CENTERS ON TWO 1033 HPA
HIGHS...WITH ONE AT 34S 110W AND THE OTHER AT 37S 95W. AN
ELONGATED FRONT LIES TO THE SOUTH...EXTENDING FROM THE SOUTH
ATLANTIC TO THE SOUTH PACIFIC...WITH AXIS ALONG A 990 HPA LOW AT
55S 42W...51S 47W...A 994 HPA LOW AT 53S 64W...50S 71W...A 990 HPA
LOW AT 53S 78W...49S 80W...A 1006 HPA LOW AT 48S 89W...47S
103W...AND A 1010 HPA LOW AT 47S 115W. ANOTHER FRONT TO THE EAST
AND NORTH LIES ALONG 49S 18W...49S 31W...A 1002 HPA LOW AT 50S
36W...47S 39W...A 1006 HPA LOW AT 46S 44W...41S 50W...TO 40S 58W.
A POLAR HIGH TO THE SOUTH CENTERS ON A 1013 HPA HIGH AT 40S 59W.
BROAD RIDGE OVER THE ATLANTIC CENTERS ON A 1025 HPA HIGH AT 39S
20W. AN ELONGATED FRONT TO THE NORTH LIES ALONG 34S 16W...33S
29W...A 1014 HPA LOW AT 35S 37W...33S 42W...A 1006 HPA LOW AT 35S
47W...TO 31S 50W.

ARREAGA...INAMHI (ECUADOR)
DURAN...SENAMHI (PERU)
DAVISON...WPC (USA)