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
 
(Latest Discussion - Issued 1352Z Aug 18, 2017)
 
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
952 AM EDT FRI AUG 18 2017

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

SYNOPSIS (VALID FROM AUG 18 AT 0000 UTC): AT 200 HPA...A LARGE
TROUGH EXTENDS FROM NORTHERN ARGENTINA TO CENTRAL PERU. TO THE
EAST...A RIDGE CENTERS OVER CENTRAL AMAZONAS IN BRASIL AND ANOTHER
OVER SALVADOR DO BAHIA. THE UPPER TROUGH IS VENTILATING CONVECTION
ALONG A CORRIDOR THAT EXTENDS FROM CENTRAL PERU/ACRE/WESTERN
AMAZONAS IN BRASIL ACROSS RONDONIA/MATO GROSSO INTO SAO PAULO IN
BRASIL. ALSO IN NORTHERN SOUTH AMERICA...TRADE WIND SHOWERS ARE
DOTTING THE COAST OC THE BRAZILIAN NORDESTE. FAIR WEATHER
CONDITIONS ARE PRESENT OTHERWISE.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET ALONG 45S
92W...44S 82W...46S 74W...50S 67W...A 136KT MAXIMA AT 48S
60W...43S 51W...EXITING AT 45S 41W. THE NORTHERN POLAR JET EXTENDS
ALONG 38S 119W...40S 110W...A 146KT MAXIMA AT 40S 103W...39S
92W...A 150KT MAXIMA AT 40S 82W...44S 68W...EXITING AT 38S 51W. IT
REFORMS AT 37S 47W ALONG 38S 35W...36S 24W...EXITING AT 40S 15W.
ANOTHER BRANCH FORMS AT 29S 47W ALONG 30S 35W...A 148KT MAXIMA AT
32S 27...EXITING AT 34S 17W. THE SUBTROPICAL JET EXTENDS ALONG 24S
119W...32S 110W...A 134KT MAXIMA AT 32S 99W...EXITING AT 29S 85W.
IT REFORMS AT 20S 66W ALONG 24S 54W...A 138KT MAXIMA AT 26S
45W...28S 32W...EXITING AT 25S 17W.

AT 500 HPA...A TROUGH EXTENDS OFF THE COAST OF SOUTHERN CHILE
ALONG 48S 79W...40S 80W...35S 85W. THIS IS ADVECTING CYCLONIC
VORTICITY AND FAVORING PRECIPITATION IN THE SOUTHERN CONE. A RIDGE
EXTENDS ALONG 65W TO THE EAST OF THIS TROUGH. A BROAD TROUGH
EXTENDS ACROSS THE SOUTHERN ATLANTIC WITH AXIS FROM A LOW OVER THE
ANTARCTIC PENINSULA AT 63S 63W...NORTH ALONG 50S 50W...INTO SANTA
CATARINA-BRASIL.

AT LOW LEVELS...A 978 HPA OCCLUDED LOW AT 53S 47W EXTENDS A FRONT
ALONG A 980 HPA LOW AT 55S 47W...47S 42W...40S 48W...38S 54W...40S
61W...A 994 HPA LOW AT 45S 71W. A 986 HPA OCCLUDED LOW AT 47S 77W
EXTENDS A FRONT ALONG A 994 HPA TRIPLE POINT LOW AT 45S 71W...41S
68W...41S 72W...A 1010 HPA LOW AT 39S 77W. A 1025 HPA HIGH CENTERS
AT 29S 97 AND EXTENDS A RIDGE INTO ANOTHER 1025 HPA HIGH AT 29S
87W. OVER THE ATLANTIC...A 1021 HPA HIGH CENTERS AT 31S 41W. A
STATIONARY FRONT EXTENDS ALONG 29S 32W...22S 41W...17S 5013S
59W...11S 63W...09S 71W.

GONZALEZ...DMC (CHILE)
VANNUCCI...SMN (ARGENTINA)
DAVISON/GALVEZ...WPC (USA)