624  
FXSA20 KWBC 261311  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
910 AM EDT THU OCT 26 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM OCT 26 AT 0000 UTC): AT 200 HPA...BROAD RIDGE  
CONTINUES TO ENVELOP CONTINENTAL AREA TO THE NORTH OF 20S. THIS IS  
VENTING ORGANIZED DEEP CONVECTION ACROSS PARA IN BRASIL...WITH  
LIGHTER CONVECTION CLUSTERING ACROSS RONDONIA-ACRE-AMAZONAS TO THE  
WEST. DEEP CONVECTION WAS ALSO BUILDING ACROSS PORTIONS OF ECUADOR  
TO THE CENTRAL JUNGLE IN PERU.  
 
AT 250 HPA...THE SOUTHERN POLAR HAS ITS ENTRANCE AT 51S 63W...THEN  
ALONG 50S 54W...57S 43W...A 121KT MAXIMUM AT 62S 28W...AND 63S  
17W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 46S 110W...THEN ALONG  
49S 99W...47S 90W...EXITING AT 43S 85W. IT REFORMS AT 41S  
78W...ALONG A 120KT MAXIMUM AT 42S 64W...EXITING AT 40S 54W. THE  
SUBTROPICAL JET TO THE NORTH HAS ITS ENTRANCE AT 30S 85W...ALONG  
29S 75W...26S 71W...26S 65W...EXITING AT 26S 57W. IT REFORMS AT  
29S 53W...ALONG 33S 43W...A 132KT MAXIMUM AT 34S 33W...EXITING AT  
32S 24W. THE SUBEQUATORIAL JET TO THE NORTH LIES ALONG 19S  
120W...17S 110W...EXITING AT 11S 101W.  
 
AT 500 HPA...SUCCESSIVE SHORT WAVE TROUGHS ARE STREAMING ACROSS  
THE SOUTHERN CONE...WITH ONE APPROACHING SOUTHERN/CENTRAL CHILE AS  
ANOTHER MOVES ACROSS PATAGONIA IN ARGENTINA TO THE WESTERN  
ATLANTIC. INFLOW OF SHORT WAVE VORTICES TO THE SOUTH ARE PROVIDING  
THE DYNAMICAL SUPPORT TO AN MCS THAT FORMED ACROSS  
PARAGUAY-CORRIENTES/MISIONES IN ARGENTINA. FARTHER EAST...SHORT  
WAVE TROUGH ON THE NORTHERN STREAM EXTENDS FROM A CLOSED LOW AT  
43S 37W TO 30S 40W. FARTHER NORTH...SHORT WAVE RIDGE EXTENDS WEST  
ACROSS THE NORTHEAST STATES OF BRASIL...WHERE IT FAVORS A MID  
LEVEL CAP INVERSION THAT IS INHIBITING ORGANIZED CONVECTION.  
 
THE SURFACE ANALYSIS SHOWS A 1012 HPA OCCLUDED LOW AT 48S 77W. A  
998 HPA OCCLUDED LOW CENTERS AT 52S 57W AND EXTENDS A FRONT ALONG  
A 998 HPA TRIPLE POINT LOW AT 51S 54W...48S 54W...A 1002 HPA LOW  
AT 46S 55W...42S 60W...43S 69W...A 1014 HPA LOW AT 45S 77W...44S  
82W. A 1029 HPA HIGH CENTERS AT 33S 95W. A FRONT EXTENDS ALONG A  
1010 HPA LOW AT 46S 49W...38S 50W...36S 55W...33S 61W...31S 67W.  
SCATTERED DEEP CONVECTION WAS OCCURRING TO THE NORTH OF THE FRONT  
IN CENTRAL AND NORTHERN ARGENTINA. A 1023 HPA HIGH CENTERS AT 32S  
36W. TO THE NORTH...A FRONT EXTENDS ALONG A 1016 HPA LOW AT 26S  
43W...22S 47W...23S 54W...24S 60W. ALSO...DRIZZLE WAS OCCURRING IN  
ANTOFAGASTA-CHILE IN ASSOCIATION WITH THE REMNANTS OF A FRONT.  
 
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
DAVISON/GALVEZ...WPC (USA)  

 
 
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