460  
FXSA20 KWBC 101523  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1123 AM EDT TUE OCT 10 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM OCT 10 AT 0000 UTC): AT 200 HPA...AN UPPER  
RIDGE CENTERS ON A HIGH OVER NORTHEASTERN PARA IN BRASIL. THIS  
RIDGE EXTENDS AN AXIS TO THE EAST INTO SOUTHERN AMAZONAS-ACRE IN  
BRASIL...AND ANOTHER TO THE SOUTHEAST INTO EASTERN MINAS  
GERAIS/ESPIRITO SANTO. THE RIDGE IS VENTILATING ISOLATED DEEP  
CONVECTION IN CENTRAL PORTIONS OF THE AMAZON BASIN. ISOLATED AND  
SHORT-LIVED DI9URNAL CONVECTION IS ALSO DOTTING THE ANDES OF  
ECUADOR...PERU...AND BOLIVIA.  
 
THE UPPER JET ANALYSIS SHOWS THE SOUTHERN POLAR JET EXTENDING  
ALONG 48S 120W...54S 110W...61S 96W...EXITING AT 54S 85W. IT  
REFORMS AT 50S 55W ALONG A 145KT MAXIMA AT 54S 37W...54S  
20W...EXITING AT 50S 08W. THE NORTHERN POLAR JET EXTENDS ALONG 41S  
120W...46S 111W...EXITING AT 49S 104W. IT REFORMS AT 43S 90W  
EXITING AT 39S 85W. IT REFORMS AT 46S 51W ALONG 51S 40W...52S  
22W...EXITING AT 345S 11W. THE SUBTROPICAL JET FORMS AT 27S 95W  
ALONG 29S 79W...A 137KT MAXIMA AT 32S 68W...31S 53W...EXITING AT  
34S 38W.  
 
AT 500 HPA...A RIDGE EXTENDS OVER THE EASTERN PACIFIC FROM 32S  
102W TO THE SOUTHEAST INTO 50S 98W...INTO 65S 85W. TO THE EAST...A  
BROAD TROUGH IS CROSSING THE CONTINENT. THE UPPER TROUGH HAS  
SEVERAL SHORT WAVE VORTICES EMBEDDED. ONE EXTENDS ACROSS TIERRA  
DEL FUEGO INTO A LOW AT 43S 91W. ANOTHER SHORT WAVE TROUGH IS  
APPROACHING CENTRAL CHILE WHILE CENTERING ON A LOW AT 30S 90W. TO  
THE EAST...A TROUGH EXTENDS FROM THE FALKLANDS/MALVINAS ...ACROSS  
THE BUENOS AIRES PROVINCE...INTO EASTERN RIO GRANDE DO SUL.  
 
AT LOW LEVELS...A 1037 HPA HIGH CENTERS AT 38S 96W....AND EXTENDS  
A RIDGE INTO ARAUCANIA/LOS RIOS IN CHILE. A 1014 HPA OCCLUDED LOW  
CENTERS AT 46S 79W. TO THE SOUTHEAST...A 998 HPA OCCLUDED LOW  
CENTERS AT 55S 62W. TO THE EAST...A FRONT EXTENDS FROM 55S 47W  
ALONG 998 HPA LOW AT 54S 56W...49S 54W...45S 56W...43S 61W...41S  
66W....37S 71W. A 998 HPA OCCLUDED LOW CENTERS AT 41S 51W AND  
EXTENDS A FRONT INTO A 998 HPA TRIPLE POINT LOW AT 3S 50W...35S  
47W...31S 52W...29S 57W...31S 64W. A 1013 HPA HIGH CENTERS AT 26S  
51W. A FRONT EXTENDS FROM A 1008 HPA LOW AT 30S 48W...ALONG 26S  
46W...23S 48W...23S 55W...23S 60W...20S 64W.  
 
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
GALVEZ...WPC (USA)  

 
 
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