553  
FXSA20 KWBC 161249  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
848 AM EDT MON OCT 16 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM OCT 16 AT 0000 UTC): AT 200 HPA...A CLOSED  
HIGH CENTERS OVER SOUTHEASTERN AMAZONAS IN BRASIL AT 09S 58W. TO  
THE WEST...A TROUGH EXTENDS ACROSS WESTERN PERU ALONG 75W NORTH  
INTO SOUTHERN COLOMBIA. UNDER THE CONVERGENT PHASE OF THE  
MADDEN-JULIAN OSCILLATION...DEEP CONVECTION IS OCCURRING IN AN  
ISOLATED MANNER IN NORTHWESTERN PARA-AMAZONAS IN BRASIL. SHALLOW  
CONVECTION AND PLENTIFUL CLOUD COVER IS OCCURRING IN ECUADOR AND  
PERU...INCLUDING THE ANDEAN REGION.  
 
THE UPPER JET ANALYSIS SHOWS A BRANCH OF THE NORTHERN POLAR JET  
FORMING AT 46S 93W ALONG A 161KT MAXIMA AT 52S 79W...56S 67W...A  
143KT MAXIMA AT 54S 55W...46S 42W...EXITING AT 38S 33W. ANOTHER  
BRANCH EXTENDS ALONG 45S 110W...40S 99W...46S 8W...50S 57W...41S  
42W...31S 32W...A 148KT MAXIMA AT 37S 22W. THE SUBTROPICAL JET  
FORMS A BRANCH AT 24S 96W ALONG 21S 87W...28S 72W...32S 58W...27S  
48W...EXITING AT 24S 40W. IT REFORMS AT 26S 37W ALONG 29S  
27W...38S 09W.  
 
AT 500 HPA...A LARGE AND ROBUST TROUGH IN THE SOUTHERN STREAM IS  
APPROACHING THE SOUTHERN CONE WHILE CENTERING ON A LOW AT 59S 85W.  
TO THE EAST...A RIDGE EXTENDS ALONG 60W-70W. IN THE NORTHERN  
STREAM...A BROAD TROUGH IS APPROACHING THE CONTINENT FROM THE  
EASTERN PACIFIC. THIS CENTERS ON TWO LOWS...ONE IS CROSSING THE  
ANDES AT 36S 71W...AND ANOTHER CENTERS AT 30S 80W. TO THE EAST...A  
RIDGE EXTENDS FROM A HIGH IN MATO GROSSO DO SUL SOUTH INTO THE  
BUENOS AIRES PROVINCE.  
 
AT LOW LEVELS...A 966 HPA OCCLUDED LOW CENTERS AT 57S 93W AND  
EXTENDS A FRONT INTO A 964 HPA TRIPLE POINT LOW AT 60S 88W...55S  
77W...48S 84W...A 996 HPA TRIPLE POINT LOW AT 45S 88W...38S 94W. A  
FRONT EXTENDS ALONG 50S 63W...A 994 HPA LOW AT 50S 71W...46S  
75W...44S 81W...A 1004 HPA LOW AT 43S 85W...38S 90W...34S 96W. A  
1019HPA HIGH CENTERS AT 28S 103W. OVER THE ATLANTIC...A 1025 HPA  
HIGH CENTERS AT 29S 43W. A FRONT EXTENDS ALONG 24S 33W...22S  
41W...23S 49W...24S 55W...23S 59W...22S 64W.  
 
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
GALVEZ...WPC (USA)  

 
 
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