682  
FXSA20 KWBC 161349  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
848 AM EST THU NOV 16 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM NOV 16 AT 0000 UTC): AT 200 HPA...A HIGH OVER  
ACRE IN BRASIL EXTENDS A RIDGE OVER WESTERN BRASIL-PERU-BOLIVIA TO  
PARAGUAY/SOUTHERN BRASIL. A TROUGH TO THE EAST NOW EXTENDS BETWEEN  
55W-35W TO THE NORTH OF 30S. UNDER INFLUENCE OF THIS TROUGH  
SCATTERED DEEP CONVECTION WAS BUILDING ACROSS PARA IN  
BRASIL...WHILE THE RIDGE VENTS DIURNAL CONVECTION ACROSS  
AMAZONAS-PERUVIAN JUNGLE AND THE ALTIPLANO OF BOLIVIA.  
 
AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS  
ALONG 54S 120W...58S 108W...EXITING AT 55S 96W. THE NORTHERN POLAR  
LIES ALONG A 123KT MAXIMUM AT 50S 118W...49S 104W...47S 89W...46S  
78W...EXITING AT 43S 72W. IT REFORMS AT 36S 67W...ALONG 37S  
60W...42S 51W...A 167KT MAXIMUM AT 44S 36W...40S 24W...39S  
10W...AND 46S 02W. THE SUBTROPICAL JET HAS A FINGER THAT EXTENDS  
BETWEEN 30S 78W AND 30S 62W. IT REFORMS AT 34S 54W...THEN ALONG  
38S 45W... EXITING AT 35S 35W.  
 
AT 500 HPA...A HIGH NEAR 39S 101W IS BUILDING A RIDGE SOUTH ALONG  
100W/110W TO THE POLAR ICECAP. THIS...IN-TURN...FAVORS THE  
AMPLIFICATION OF A TROUGH ACROSS THE BELLINGSHAUSEN SEA TO THE  
SOUTHERN CONE OF SOUTH AMERICA...WITH AXIS ORIGINATING ON A LOW AT  
65S 85W. ANOTHER RIDGE TO THE EAST EXTENDS FROM THE  
MALVINAS/FALKLAND ISLANDS TO THE WEDDELL SEA. SHORT WAVE  
PERTURBATIONS POPULATE THE NORTHERN STREAM FLOW...WITH ONE  
ENTERING CENTRAL CHILE AS ANOTHER PULLS ACROSS THE BUENOS AIRES  
PROVINCE. THE LATTER FAVORS SCATTERED DEEP CONVECTION ACROSS ENTRE  
RIOS-URUGUAY.  
 
AT LOW LEVELS...AN OCCLUDED 962 HPA LOW AT 63S 79W EXTENDS A FRONT  
ALONG A 970 HPA LOW AT 66S 82W...68S 71W...65S 66W...A 986 HPA LOW  
AT 61S 66W...57S 64W...55S 64W...A 998 HPA LOW AT 51S 66W...47S  
67W...44S 71W...A 1018 HPA LOW AT 42S 76W...TO 38S 79W. THIS IS  
FOLLOWED BY ANOTHER FRONT THAT EXTENDS FROM A 990 HPA LOW AT 52S  
87W...ALONG A 990 HPA LOW AT 51S 83W...45S 82W...42S 90W...AND 45S  
101W. A RIDGE TO THE NORTH CENTERS ON A 1033 HPA HIGH AT 35S 100W.  
FARTHER EAST...OVER THE SOUTH ATLANTIC...AN ELONGATED FRONT  
EXTENDS FROM A 994 HPA LOW AT 43S 28W...40S 29W...39S 33W...38S  
40W...A 998 HPA LOW AT 35S 51W... NORTHERN URUGUAY-ENTRE RIOS TO  
NORTHERN MENDOZA. MODERATE POST FRONTAL CONVECTION WAS NOTED  
ACROSS URUGUAY.  
 
OVIEDO...SHN (ARGENTINA)  
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
DAVISON...WPC (USA)  

 
 
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