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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1501Z Dec 16, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1001 AM EST TUE DEC 16 2014

GFS DATA AT FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PROD/

SYNOPSIS (VALID FROM DECEMBER 16 AT 00UTC): ANALYSIS AT 200 HPA
SHOWS THE SUBTROPICAL RIDGE OVER THE CONTINENT...ENVELOPING MOST
OF SOUTH AMERICA WHILE CENTERING ON A CLOSED HIGH NEAR 13S 60W.
THE RIDGE ALOFT IS VENTING DEEP CONVECTION OVER THE CONTINENT TO
THE NORTH OF 20S.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS
ALONG A 148KT MAXIMUM AT 49S 128W...53S 105W...EXITING AT 50S 75W.
IT REFORMS AT 54S 64W...THEN ALONG 61S 52W...SOUTH GEORGIA
ISLANDS...53S 31W...AND A 182KT MAXIMUM AT 49S 03W. THE NORTHERN
POLAR HAS ITS ENTRANCE AT 37S 66W...ALONG 39S 61W...EXITING AT 47S
52W. THE SUBTROPICAL JET TO THE NORTH HAST ITS ENTRANCE AT 25S
84W...THEN ALONG 26S 70W...URUGUAY...EXITING NEAR RIO DE JANEIRO.

AT 500 HPA...A TROUGH ON THE SOUTHERN STREAM ENTERED THE SOUTHERN
CONE OF SOUTH AMERICA...AS IT EXTENDS FROM A CLOSED LOW NEAR 65S
85W TO ISLA DE CHILOE IN SOUTHERN CHILE. THIS IS PHASING WITH A
SHORT WAVE TROUGH TO THE NORTH...AS THE LATTER EXTENDS FROM 40S
76W TO 25S 80W. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS
NORTHERN/CENTRAL CHILE TO ARGENTINA...WHERE IT IS PROVIDING
DYNAMICAL SUPPORT TO AN MCS ON THE NORTHERN PROVINCES. A RIDGE TO
THE EAST EXTENDS FROM MATO GROSSO DO SUL IN BRASIL...ACROSS RIO
GRANDE DO SUL...INTO THE ATLANTIC ALONG 40S 47W...TO 65S 50W.

AT LOW LEVELS...RIDGES ON THE NORTHERN STREAM ARE INITIALIZED OVER
THE EASTERN PACIFIC AND WESTERN ATLANTIC...WITH THE WESTERNMOST
CENTERING ON A 1029 HPA HIGH AT 32S 110W...WHILE THE EASTERNMOST
CENTERS ON A 1025 HPA HIGH AT 40S 41W. A POLAR FRONT TO THE SOUTH
EXTENDS ALONG A 1000 HPA LOW AT 51S 29W...49S 34W...51S 39W...58S
48W...A 990 HPA LOW AT 59S 61W...56S 60W...A 996 HPA LOW AT 54S
65W...45S 65W...43S 72W...A 1018 HPA LOW AT 42S 78W...37S 84W...TO
A 1022 HPA LOW AT 33S 88W. ANOTHER FRONT TO THE EAST LIES ALONG A
1016 HPA LOW AT 40S 18W...34S 26W...A 1014 HPA LOW AT 27S 37W...TO
25S 44W.

ARREAGA...INAMHI (ECUADOR)
DURAN...SENAMHI (PERU)
DAVISON...WPC (USA)