671  
FXSA20 KWBC 201309  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
909 AM EDT FRI OCT 20 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM OCT 20 AT 0000 UTC): AT 200 HPA...A LONG WAVE  
TROUGH EXTENDS ALONG 85W-88W...WEST OF A RIDGE THAT EXTENDS FROM  
EASTERN COLOMBIA SOUTH ACROSS NORTHERN BOLIVIA INTO NORTHERN  
PARAGUAY. ENHANCED CONVECTION IS OCCURRING IN SOUTHERN PERU AND  
EASTERN BOLIVIA. TO THE EAST...THE CAVADO DO NORDESTE CENTERS ON A  
LOW OFF THE COASTS OF BAHIA.  
 
THE UPPER JET ANALYSIS SHOWS THE SOUTHERN POLAR JET EXTENDING  
ALONG 49S 120W...50S 110W...EXITING AT 50S 100W. THE NORTHERN  
POLAR JET FORMS AT 42S 97W ALONG 40S 80W...39S 64W...41S 44W...A  
148KT MAXIMA AT 48S 26W...47S 09W. THE SUBTROPICAL JET FORMS AT  
21S 113W ALONG 28S 105W...33S 92W...EXITING AT 31S 79W. IT REFORMS  
AT 30S 63W ALONG 34S 51W...A 143KT MAXIMA AT 39S 40W...43S  
28W...EXITING AT 40S 19W. ANOTHER FINGER FORMS AT 23S 66W ALONG  
26S 60W...EXITING AT 27S 52W.  
 
AT 500 HPA...IN THE SOUTHERN STREAM...A BROAD TROUGH HAS CROSSED  
INTO THE ATLANTIC WHILE EXTENDING BETWEEN 60W AND 30W AND TO THE  
SOUTH OF 45S. THIS IS EXTENDING A SHORT WAVE TROUGH ACROSS TIERRA  
DEL FUEGO INTO A LOW AT 49S 76W...INTO 35S 85W. TO THE  
EAST...ZONAL FLOW EXTENDS ACROSS MOST OF CENTRAL AND SOUTHERN  
ARGENTINA AND CHILE.  
 
AT LOW LEVELS...A 1008 HPA OCCLUDED LOW CENTERS AT 50S 78W AND  
EXTENDS A FRONT ALONG A 1008 HPA TRIPLE POINT LOW AT 50S 74W...45S  
75W...44S 82W. TO THE EAST...A 996 HPA OCCLUDED LOW CENTERS AT 50S  
53W. IN PATAGONIA...A FRONT EXTENDS FROM 39S 59W ALONG 42S 63W...A  
1008 HPA LOW AT 64S 67W...40S 68W...36S 71W. IN THE PACIFIC...A  
1025 HPA HIGH CENTERS AT 36S 87W. TO THE EAST... A 1019 HPA HIGH  
CENTERS AT 35S 54W OVER URUGUAY. A FRONT EXTENDS TO THE NORTHEAST  
ALONG A 1014 HPA LOW AT 31S 43W...25S 45W...23S 52W...A 1004 HPA  
LOW AT 21S 60W...16S 61W...16S 66W. DEEP CONVECTION WAS OCCURRING  
IN EASTERN BOLIVIA AND PARAGUAY/MATO GROSSO DO SUL.  
 
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
GALVEZ...WPC (USA)  

 
 
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