596  
FXSA20 KWBC 021438  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
938 AM EST TUE JAN 02 2018  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM JAN 02 AT 0000 UTC): AT 200 HPA...A HIGH OVER  
CENTRAL BOLIVIA ANCHORS A CELL OF THE SUBTROPICAL RIDGE OVER THE  
CONTINENT. THE RIDGE BRANCHES WEST ACROSS SOUTHERN PERU TO THE  
EASTERN PACIFIC AND TO THE SOUTHEAST ACROSS SAO PAULO INTO THE  
ATLANTIC ALONG 30S 40W. THIS IS VENTING DEEP CONVECTION ACROSS  
PARAGUAY-MATO GROSSO DO SUL-BOLIVIA AND THE SOUTHERN JUNGLE OF  
PERU. A TROUGH TO THE NORTH...MEANWHILE...EXTENDS FROM 05S 40W TO  
THE GUIANAS. THIS FAVORS ISOLATED TO SCATTERED CONVECTION ACROSS  
PARA AND THE NORTHEAST STATES OF BRASIL.  
 
AT 250 HPA...THE SOUTHERN POLAR HAS ITS ENTRANCE AT 57S 99W...THEN  
ALONG 56S 92W...51S 74W...48S 44W...50S 25W...AND 52S 05W. THE  
NORTHERN POLAR LIES ALONG 40S 120W...A 152KT MAXIMUM AT 46S  
108W...51S 95W...EXITING AT 43S 74W. IT REFORMS AT 45S 67W...ALONG  
46S 60W...45S 41W...47S 26W...AND A 158KT MAXIMUM AT 48S 07W. THE  
SUBTROPICAL JET LIES ALONG 37S 120W...42S 109W...45S 100W...44S  
86W...EXITING AT 38S 78W. IT REFORMS AT 27S 68W...THEN ALONG 35S  
56W...A 138KT MAXIMUM AT 39S 45W...40S 34W...44S 19W...AND 42S  
02E. A FINGER OF THE SUBTROPICAL JET...MEANWHILE...HAS ITS  
ENTRANCE AT 27S 59W...THEN ALONG 32S 47W...29S 40W...EXITING AT  
24S 38W. A FINGER OF THE SUBEQUATORIAL JET AT 150 HPA LIES ALONG  
01S 108W...04S 104W...EXITING AT 04S 100W.  
 
AT 500 HPA...BUILDING RIDGE EXTENDS FROM 30S 100W...ALONG 50S  
95W...TO 65S 100W. BROAD TROUGH LIES TO THE EAST...WITH AXIS  
ENVELOPING THE SOUTHERN CONE OD SOUTH AMERICA/SOUTHWEST ATLANTIC  
WHILE CONFINING TO AREA SOUTH OF 40S. THIS IS FOCUSING SHORT WAVE  
ENERGY ACROSS SOUTHERN PORTIONS OF CHILE AND PATAGONIA IN  
ARGENTINA. A SHORT WAVE TROUGH ON THE NORTHERN  
STREAM...MEANWHILE...EXTENDS FROM RIO DE LA PLATA BASIN TO  
NORTHWEST ARGENTINA. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS  
PARAGUAY-SOUTHERN STATES OF BRASIL WHERE IT PROVIDES DYNAMICAL  
SUPPORT TO ORGANIZED DEEP CONVECTION.  
 
A LOW LEVELS...A DUAL BARRELED RIDGE OVER THE EASTERN SOUTH  
PACIFIC CENTERS ON TWO 1025 HPA HIGHS...WITH ONE AT 32S 102W AND  
THE OTHER 35S 83W. THIS EXTENDS A RIDGE SOUTH ALONG 85W/90W TO THE  
BELLINGSHAUSEN SEA. BROAD TROUGH LIES TO THE EAST...ENVELOPING THE  
SOUTHWEST ATLANTIC. POLAR FRONTS REVOLVE AROUND THIS AXIS...WITH  
ONE EXTENDING ALONG A 998 HPA LOW AT 50S 40W...47S 40W...45S  
49W...A 1002 HPA LOW AT 45S 57W...TO THE BUENOS AIRES PROVINCE/LA  
PAMPA IN ARGENTINA. ANOTHER FRONT TO THE NORTH LIES ALONG A 1006  
HPA LOW 47S 29W...43S 30W...A 1006 HPA LOW AT 37S 37W...33S  
40W...A 1006 HPA LOW AT 32S 49W...RIO GRANDE DO SUL TO NORTHERN  
MENDOZA. ORGANIZED DEEP CONVECTION TO THE NORTH IS BUILDING OVER  
SOUTHERN BRASIL-PARAGUAY.  
 
OVIEDO...SHN (ARGENTINA)  
POMIER...SENAMHI (BOLIVIA)  
DAVISON...WPC (USA)  

 
 
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