Skip Navigation Links weather.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center
 
South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1356Z Nov 18, 2014)
 
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
 
Abbreviations and acronyms used in this product


SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
856 AM EST TUE NOV 18 2014

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

SYNOPSIS (VALID FROM NOVEMBER 18 AT 00UTC): THE 200 HPA ANALYSIS
SHOWS A BROAD CELL OF THE SUBTROPICAL RIDGE OVER NORTHERN SOUTH
AMERICA...WITH AXIS CENTERING ON A CLOSED HIGH NEAR 12A 54W. THIS
IS VENTING CONVECTION OVER THE CONTINENT TO THE NORTH OF
10S...WITH MOST INTENSE CLUSTERING ACROSS NORTHEAST BRASIL.

AT 250 HPA...THE JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH AXIS
ALONG 69S 108W...65S 97W...A 121KT MAXIMUM AT 60S 86W...EXITING AT
56S 76W. IT REFORMS AT 56S 64W...ALONG 60S 55W...EXITING AT 62S
41W. IT HAS A FINGER TO THE NORTH WITH ENTRANCE AT 58S 95W...ALONG
54S 88W...EXITING AT 48S 83W. THE SOUTHERN POLAR REFORMS AT 46S
76W...ALONG A 139KT MAXIMUM AT 51S 62W...A 141KT MAXIMUM AT 54S
41W...54S 23W...AND 53S 06W. THE NORTHERN POLAR LIES ALONG A 124KT
MAXIMUM AT 29S 120W...36S 107W...39S 84W...A 135KT MAXIMUM AT 43S
71W...48S 54W...EXITING AT 46S 38W. THE SUBTROPICAL JET TO THE
NORTH HAS ITS ENTRANCE AT 28S 100W...ALONG 32S 89W...EXITING AT
33S 79W. IT REFORMS AT 21S 72W...ALONG 24S 69W...28S 60W...25S
50W...EXITING AT 20S 42W. IT HAS A FINGER TO THE EAST BETWEEN 20S
38W AND 22S 32W.

AT MID LEVELS...A HIGH AMPLITUDE TROUGH NOW EXTENDS FROM THE
ANTARCTIC PENINSULA...ACROSS TIERRA DEL FUEGO...47S 80W...TO 38S
95W. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS SOUTHERN PORTIONS
OF CHILE TO PATAGONIA IN ARGENTINA. FARTHER NORTH...A SHORT WAVE
TROUGH ON THE NORTHERN STREAM LIES OFF THE NORTH COAST OF
CHILE...WITH AXIS CENTERING ON A LOW NEAR 25S 77W. A WANING RIDGE
TO THE EAST EXTENDS FROM SOUTHERN CHILE...ALONG 43S 45W...TO 45S
30W. FURTHERMORE...A SHORT WAVE TROUGH ON THE NORTHERN STREAM
EXTENDS BETWEEN 45W-20W AND TO THE SOUTH OF 20S...ANCHORING ON A
LOW NEAR 41S 33W.

AT LOW LEVELS...A BROAD TROUGH EXTENDS NORTH ACROSS THE DRAKE
PASSAGE TO THE SOUTHERN CONE OF SOUTH AMERICA. IT CENTERS ON AN
OCCLUDED 954 HPA LOW AT 62S 68W. POLAR FRONTS REVOLVE AROUND THIS
AXIS...WITH ONE THAT EXTENDS FROM A 964 HPA LOW AT 62S 54W...60S
51W...59S 53W...A 968 HPA LOW AT 58S 58W...57S 57W...54S 59W...A
980 HPA LOW AT 52S 64W...50S 63W...47S 68W...A 1000 HPA LOW AT 43S
76W...40S 80W...AND 38S 87W. ANOTHER FRONT LIES TO THE EAST AND
NORTH...ORIGINATING ON AN OCCLUDED 980 HPA LOW AT 57S 36W...A 988
HPA LOW AT 55S 34W...51S 34W...48S 43W...45S 53W...A 996 HPA LOW
AT 45S 65W...40S 64W...38S 70W...A 1006 HPA LOW AT 42S 74W...39S
77W...35S 83W...AND 33S 89W. THESE COMBINE IN SUPPORT OF SCATTERED
CONVECTION ACROSS SOUTHERN PORTIONS OF CHILE. FARTHER EAST...OVER
THE CENTRAL ATLANTIC...AN OCCLUDED 1002 HPA LOW AT 36S 26W EXTENDS
A FRONT ALONG A 1010 HPA LOW AT 41S 24W...35S 22W...29S 24W...24S
27W...A 1014 HPA LOW AT 22S 30W...17S 32W...TO SALVADOR DE BAHIA
IN BRASIL...WHERE IT SUSTAINS SCATTERED CONVECTION. A RIDGE TO THE
SOUTH CENTERS ON A 1025 HPA HIGH AT 40S 40W.

CAROCA...DMC (CHILE)
DURAN...SENAMHI (PERU)
DAVISON...WPC (USA)
GALVEZ...WPC (USA)