562  
FXSA20 KWBC 111357  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
957 AM EDT WED OCT 11 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM OCT 11 AT 0000 UTC): AT 200 HPA... A RIDGE  
CENTERS ON A HIGH OVER PARA/MARANHAO. A TROUGH EXTENDS ACROSS  
CENTRAL AND NORTHERN PERU. ISOLATED TO SCATTERED CONVECTION IS  
OCCURRING IN THE WESTERN AMAZON...SPECIFICALLY IN COLOMBIA AND  
NORTHERN PERU...BETWEEN THE RIDGE AND THE TROUGH. MORE ISOLATED  
ACTIVITY IS OCCURRING IN PARA AND CENTRAL/EASTERN AMAZONAS IN  
BRASIL.  
 
THE UPPER JET ANALYSIS SHOWS THE SOUTHERN POLAR JET EXTENDING  
ALONG 50S 120W...55S 105W...57S 89W...EXITING AT 59S 76W. IT  
REFORMS AT 57S 41W ALONG A 157KT MAXIMA AT 61S 20W. ANOTHER BRANCH  
FORMS AT 50S 32W ALONG 54S 18W. THE NORTHERN POLAR JET EXTENDS  
ALONG 37S 120W...EXITING AT 44S 109W. IT REFORMS AT 45S  
106W...EXITING AT 47S 94W. A FINGER FORMS AT 42S 82W EXITING AT  
36S 83W. IT REFORMS AT 33S 77W ALONG 37S 58W...A 130KT MAXIMA AT  
40S 41W...EXITING AT 41S 35W. IT REFORMS AT 43S 32W EXITING AT 47S  
27W. THE SUBTROPICAL JET EXTENDS A FINGER FROM 27S 106W EXITING AT  
21S 99W. IT REFORMS AT 24S 90W ALONG 29S 74W...A 143KT MAXIMA AT  
35S 52W...35S 38W...EXITING AT 30S 27W.  
 
AT 500 HPA...A RIDGE CENTERS ON A HIGH AT 33S 102W...AND EXTENDS  
AN AXIS TO THE SOUTHEAST INTO AYSEN IN CHILE. A TROUGH EXTENDS TO  
ITS EAST WITH AN AXIS ALONG 50W AND TO THE SOUTH OF 40S. THIS  
TROUGH EXTENDS AN AXIS TO ITS NORTHEAST ACROSS CENTRAL PATAGONIA  
INTO ARAUCANIA/BIO BIO IN CHILE...AND INTO 28S 82W. A HIGH CENTERS  
OVER SAO PAULO/RIO DE JANEIRO IN BRASIL.  
 
AT LOW LEVELS...A 964 HPA LOW CENTERS AT 70S 92W AND EXTENDS A  
FRONT ALONG A TRIPLE POINT LOS OF 968 HPA AT 70S 86W...64S  
72W...56S 74W...51S 84W...53S 96W...A 1014 HPA LOW AT 52S  
104W...48S 108W. A 1039 HPA HIGH CENTERS AT 39S 94W AND EXTENDS A  
RIDGE TO THE SOUTHEAST INTO AYSEN AND CENTRAL/SOUTHERN PATAGONIA.  
A 1017 HPA HIGH CENTERS AT 38S 54W. A 1008 HPA OCCLUDED LOW  
CENTERS AT 47S 55W. A 972 OCCLUDED LOW AT 51S 38W EXTENDS A FRONT  
ALONG A 992 HPA TRIPLE POINT LOW AT 54S 26W...A 982 HPA LOW AT 51S  
31W...44S 29W...37S 34W....34S 38W...30S 45W...28S 54W...A 1006  
HPA LOW AT 27S 58W...21S 65W. RAINFALL WAS OCCURRING IN EXTREME  
SOUTHERN BRASIL.  
 
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
GALVEZ...WPC (USA)  

 
 
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