769  
FXSA20 KWBC 091445  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
944 AM EST TUE JAN 09 2018  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM JAN 09 AT 0000 UTC): AT 200 HPA...THE  
BOLIVIAN HIGH NOW CENTERS OVER SOUTHERN PERU...WITH ASSOCIATED  
RIDGE CONFINING TO AREA NORTH OF 25S AND WEST OF 55W. EAST OF THIS  
AXIS...A TROUGH EXTENDS OVER THE NORTHEAST STATES OF BRASIL WHILE  
CENTERING ON A CLOSED LOW AT 07S 40W. THE RIDGE ALOFT IS VENTING  
DEEP CONVECTION ACROSS RONDONIA-MATO GROSSO/MATO GROSSO DO SUL TO  
SAO PAULO IN BRASIL...WHILE TROUGH IS ENHANCING DIURNAL CONVECTION  
ACROSS PARA-ILHA DE MARAJO.  
 
AT 250 HPA...THE SOUTHERN POLAR EXTENDS ALONG 49S 120W...48S  
113W...A 134KT MAXIMUM AT 50S 106W...52S 93W...54S 84W...EXITING  
AT 56S 74W. IT REFORMS AT 58S 68W...ALONG 60S 60W...57S 48W...51S  
40W...EXITING AT 45S 34W. A FINGER OF THE NORTHERN POLAR EXTENDS  
BETWEEN 48S 93W AND 50S 77W. IT REFORMS AT 51S 72W...ALONG A 136KT  
MAXIMUM AT 53S 67W...54S 55W...A 160KT MAXIMUM AT 51S 45W...46S  
41W...EXITING AT 40S 36W. THE SUBTROPICAL JET LIES ALONG 39S  
120W...A 145KT MAXIMUM AT 41S 113W...40S 108W...36S 100W...EXITING  
AT 29S 96W. A FINGER TO THE EAST EXTENDS BETWEEN 21S 92W AND 33S  
84W. IT REFORMS AT 37S 81W...THEN ALONG 41S 76W...48S 69W...52S  
58W...47S 49W...EXITING AT 37S 44W. THE SUBTROPICAL JET REFORMS AT  
29S 44W...ALONG 32S 33W...36S 22W...41S 12W...AND 43S 00W.  
 
AT 500 HPA...BROAD TROUGH DOMINATES THE SOUTHWEST PACIFIC WHILE  
CENTERING ON A CLOSED LOW AT 60S 102W. THE TROUGH IS FOCUSING  
SHORT WAVE ENERGY ACROSS SOUTHERN PORTIONS OF CHILE/PATAGONIA IN  
ARGENTINA-TIERRA DEL FUEGO...WHERE IT SUSTAINS SCATTERED  
CONVECTION. A RIDGE LIES TO THE EAST...ORIGINATING ON A CLOSED  
HIGH OVER EASTERN LA PAMPA/SOUTHERN BUENOS AIRES PROVINCE...WITH  
AXIS SOUTH ALONG 60W TO THE ANTARCTIC PENINSULA. BROAD TROUGH TO  
THE EAST EXTENDS OVER THE SOUTH ATLANTIC BETWEEN 50W-10W AND TO  
THE SOUTH OF 30S.  
 
AT LOW LEVELS...A NORTHERN STREAM RIDGE OVER THE EASTERN PACIFIC  
CENTERS ON TWO 1019 HPA HIGHS...WITH ONE AT 22S 99W AND THE OTHER  
AT 34S 95W. BROAD TROUGH TO THE SOUTH DOMINATES THE SOUTHEAST  
PACIFIC WHILE CENTERING ON AN OCCLUDED 950 HPA LOW AT 60S 95W.  
POLAR FRONTS REVOLVE AROUND THIS AXIS...WITH ONE EXTENDING FROM A  
986 HPA LOW AT 56S 66W...53S 66W...A 990 HPA LOW AT 52S  
69W...CENTRAL PATAGONIA... PUERTO MONTT...A 1014 HPA LOW AT 37S  
80W...32S 83W...27S 94W...AND 27S 102W. THIS TRIGGERED LIGHT  
RAINFALL ACROSS SOUTHERN CHILE. OVER THE ATLANTIC...A RIDGE  
EXTENDS SOUTH ALONG 40W TO THE SOUTH GEORGIA ISLANDS...WHILE  
CENTERING ON TWO 1025 HPA HIGHS. ONE CENTERS AT 33S 40W AND THE  
OTHER AT 40S 42W. AN ELONGATED FRONT TO THE NORTH LIES ALONG A  
1018 HPA LOW AT 39S 18W...35S 21W...32S 27W...30S 36W...A 1018 HPA  
LOW AT 28S 46W... SOUTHERN SAO PAULO...CORRIENTES TO SOUTHERN  
FORMOZA IN ARGENTINA.  
 
OVIEDO...SHN (ARGENTINA)  
POMIER...SENAMHI (BOLIVIA)  
DAVISON...WPC (USA)  

 
 
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