244  
FXSA20 KWBC 101448  
PMDSA  
 
SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
948 AM EST WED JAN 10 2018  
 
GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/  
 
SYNOPSIS (VALID FROM JAN 10 AT 0000 UTC): AT 200 HPA...CELL OF THE  
SUBTROPICAL RIDGE OVER THE CONTINENT CENTERS ON A CLOSED HIGH NEAR  
16S 67W. THE RIDGE ALOFT IS VENTING ORGANIZED DEEP CONVECTION  
ALONG A LINE FROM SAO PAULO IN BRASIL TO NORTHERN  
BOLIVIA/RONDONIA. IT IS ALSO VENTING LATE AFTERNOON CONVECTION  
ALONG THE SIERRA OF PERU TO THE ALTIPLANO OF BOLIVIA. EAST OF THIS  
RIDGE...A LOW NEAR 07S 40W EXTENDS A TROUGH TO THE GUIANAS. THIS  
IS ENHANCING COASTAL CONVECTION ACROSS NORTHERN BRASIL.  
 
AT 250 HPA...THE SOUTHERN POLAR LIES ALONG 46S 120W...49S 108W...A  
141KT MAXIMUM AT 54S 95W...57S 82W...A 141KT MAXIMUM AT 48S  
71W...59S 43W...A 124KT MAXIMUM AT 50S 25W...EXITING AT 43S 20W.  
THE NORTHERN POLAR HAS A FINGER WITH ENTRANCE AT 41S 109W...ALONG  
45S 100W...A 135KT MAXIMUM AT 47S 96W...EXITING AT 45S 87W. IT  
REFORMS AT 50S 68W...THEN ALONG 50S 59W...50S 52W...50S 42W...43S  
31W...EXITING AT 35S 23W. THE SUBTROPICAL JET LIES ALONG 32S  
120W...36S 111W...A 128KT MAXIMUM AT 38S 106W...41S 95W...38S  
88W...31S 85W...EXITING AT 26S 85W. A FINGER TO THE EAST EXTENDS  
BETWEEN 39S 73W AND 45S 57W. IT REFORMS BETWEEN 42S 39W AND 32S  
30W.  
 
AT 500 HPA...A BROAD TROUGH EXTENDS OVER THE SOUTHEAST PACIFIC  
WHILE ENVELOPING AREA BETWEEN 130W-60W AND TO THE SOUTH OF 35S.  
THE TROUGH IS FOCUSING SHORT WAVE ENERGY ACROSS EXTREME SOUTHERN  
PORTIONS OF CHILE/TIERRA DEL FUEGO. DOWNSTREAM FROM THIS AXIS...A  
HIGH AT 39S 47W EXTENDS A RIDGE SOUTH ACROSS THE SOUTH GEORGIA  
ISLANDS TO THE WEDDELL SEA. A BROAD TROUGH TO THE EAST BOUNDS  
BETWEEN 35W-00W AND TO THE SOUTH OF 30S.  
 
AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM ANCHORS ON TWO  
HIGHS...A 1019 HPA HIGH AT 23S 102W AND A 1021 HPA HIGH AT 38S  
83W. BROAD TROUGH TO THE SOUTH CENTERS ON AN OCCLUDED 958 HPA LOW  
AT 64S 90W. EMBEDDED IN THIS FLOW...A POLAR FRONT EXTENDS FROM A  
982 HPA LOW AT 64S 56W...ALONG A 986 HPA LOW AT 63S 52W...60S  
48W...57S 50W...56S 60W...58S 70W...A 982 HPA LOW AT 61S 75W...56S  
75W...54S 83W...TO A 982 HPA LOW AT 54S 97W. ANOTHER FRONT TO THE  
NORTH EXTENDS FROM AN OCCLUDED 998 HPA LOW AT 54S 42W...A 1002 HPA  
LOW AT 51S 38W...48S 39W...49S 42W...A 1006 HPA LOW AT 50S  
46W...45S 51W...42S 59W...A 1012 HPA LOW AT 40S 64W...39S 68W...A  
1014 HPA LOW AT 37S 75W...34S 77W...32S 80W...TO A 1018 HPA LOW AT  
32S 89W. A POLAR RIDGE TO THE SOUTH CENTERS ON A 1017 HPA HIGH AT  
47S 62W. FARTHER NORTH...A RIDGE ON THE NORTHERN STREAM CENTERS ON  
TWO 1027 HPA HIGHS...WITH ONE AT 35S 40W AND THE OTHER AT 34S 29W.  
AN OLD/ELONGATED FRONT TO THE NORTH OF THIS RIDGE LIES ALONG 35S  
11W...28S 24W...27S 32W...28S 40W...TO SOUTHERN BRASIL-ENTRE RIOS  
IN ARGENTINA.  
 
OVIEDO...SHN (ARGENTINA)  
POMIER...SENAMHI (BOLIVIA)  
DAVISON...WPC (USA)  

 
 
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