052  
FXSA20 KWBC 031338  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
937 AM EDT FRI NOV 03 2017  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM NOV 02 AT 0000 UTC): NORTH OVER THE  
CONTINENT...AT 200 HPA...A HIGH OVER RONDONIA IN BRASIL EXTENDS A  
RIDGE THAT SPANS FROM THE PERUVIAN JUNGLE...ACROSS AMAZONAS/ACRE  
IN BRASIL-BOLIVIA TO BAHIA/MINAS GERAIS. THE RIDGE ALOFT IS  
VENTING DIURNAL CONVECTION OVER BRASIL TO THE WEST OF 50W AND  
NORTH OF 25S. A TROUGH TO THE NORTH...MEANWHILE...EXTENDS ACROSS  
NORTHEAST BRASIL WHILE CENTERING ON AN ILL ORGANIZED LOW NEAR 00N  
45W. THE TROUGH FAVORS ISOLATED TO SCATTERED CONVECTION ACROSS  
NORTHEAST BRASIL.  
 
THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT  
65S 81W...THEN ALONG 63S 71W...62S 52W...EXITING AT 59S 39W. A  
BRANCH TO THE NORTH HAS ITS ENTRANCE AT 53S 84W...CROSSING 56S  
71W...A 127KT MAXIMUM AT 58S 52W...53S 42W...49S 33W...EXITING AT  
47S 25W. THE NORTHERN POLAR LIES ALONG 35S 120W...A 155KT MAXIMUM  
AT 38S 110W..40S 100W...40S 91W...A 122KT MAXIMUM AT 36S  
88W...EXITING AT 33S 84W. ANOTHER BRANCH OF THE NORTHERN POLAR HAS  
ITS ENTRANCE AT 41S 60W...THEN ALONG 45S 55W...45S 45W..41S  
37W...EXITING AT 34S 31W. THE NORTHERN POLAR REFORMS TO THE NORTH  
NEAR 33S 77W...THEN ALONG 33S 67W...34S 60W...39S 55W...37S  
42W...31S 34W...29S 26W...34S 16W...EXITING AT 41S 06W. THE  
SUBTROPICAL JET HAS ITS ENTRANCE AT 21S 80W...THEN ALONG 25S  
70W...28S 56W...26S 47W...23S 32W...26S 22W...A 136KT MAXIMUM AT  
33S 13W...AND 34S 01W.  
 
AT 500 HPA...HIGH AMPLITUDE TROUGH TO THE WEST EXTENDS BETWEEN  
150W-110W TO THE SOUTH OF 25S. EAST OF THIS AXIS...PROGRESSIVE  
SHORT WAVE TROUGH IS STREAMING ACROSS 90W TO 38S. A BROAD SHORT  
WAVE TROUGH TO THE EAST EXTENDS BETWEEN 80-50W AND TO THE SOUTH OF  
25S. THE LATTER IS FOCUSING SHORT WAVE ENERGY ACROSS CENTRAL  
CHILE/ARGENTINA TO THE RIO DE LA PLATA BASIN. THIS IS PROVIDING  
DYNAMICAL SUPPORT TO ORGANIZED CONVECTION ACROSS SOUTHERN  
BRASIL-MESOPOTAMIA VALLEY IN ARGENTINA AND SOUTHEAST PARAGUAY. THE  
TROUGH SUSTAINS AN INDUCED SHORT WAVE RIDGE TO THE EAST THAT  
EXTENDS ALONG 45W/47W TO 50S. A BROAD TROUGH ON THE SOUTHERN  
STREAM EXTENDS BETWEEN 80W-20W AND TO THE SOUTH OF 50S.  
 
AT LOW LEVELS...AN ELONGATED FRONT ON THE SOUTHERN STREAM EXTENDS  
ALONG A 984 HPA LOW AT 52S 27W...47S 30W...48S 39W...51S 48W...56S  
53W...A 986 HPA LOW AT 58S 65W...56S 65W...TO SOUTHERN PATAGONIA.  
A FRONT TO THE NORTH EXTENDS FROM A 1004 HPA LOW AT 36S  
58W...ALONG 31S 59W...30S 66W...A 1016 HPA LOW AT 30S 72W...25S  
78W...21S 87W...AND 18S 93W. THIS SYSTEM SUSTAINS ORGANIZED DEEP  
CONVECTION ACROSS URUGUAY-MESOPOTAMIA VALLEY IN ARGENTINA. ANOTHER  
FRONT TO THE EAST AND NORTH EXTENDS ALONG A 1014 HPA LOW AT 27S  
18W...23S 22W...19S 29W...ESPIRITO SANTO-SAO PAULO TO MATO GROSSO  
DO SUL. A RIDGE TO THE SOUTH CENTERS ON A 1025 HPA HIGH AT 33S 37W.  
 
OVIEDO...SHN (ARGENTINA)  
VANNUCCI...SMN (ARGENTINA)  
RIVAS...SENAMHI (PERU)  
DAVISON...WPC (USA)  

 
 
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