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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1423Z Jan 26, 2015)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
923 AM EST MON JAN 26 2015

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

SYNOPSIS (VALID FROM JANUARY 26 AT 00UTC): AT 200 HPA...WANING
CELL OF THE SUBTROPICAL RIDGE EXTENDS EAST FROM A CLOSED HIGH NEAR
LIMA PERU...ALONG 14S 70W...MATO GROSSO DO SUL TO SAO PAULO IN
BRASIL. A TROUGH TO THE SOUTH PRESSES AGAINST THIS AXIS...WHILE
ANCHORING ON A CLOSED LOW OVER CORRIENTES/CHACO ARGENTINO. THE
RIDGE/TROUGH PAIR FAVOR SCATTERED CONVECTION ACROSS SOUTHERN
PERU-NORTHERN BOLIVIA-MATO GROSSO DO SUL TO SAO PAULO. FARTHER
NORTH...A BROAD AREA OF DIFFLUENCE ENVELOPS NORTHERN PORTIONS OF
SOUTH AMERICA...VENTING DIURNAL CONVECTION TO THE NORTH OF 10S.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
47S 100W AND EXITING AT 51S 86W. THE NORTHERN POLAR HAS ITS
ENTRANCE AT 42S 105W...THEN ALONG 45S 89W...46S 75W...47S
65W...EXITING AT 44S 46W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
33S 113W...THEN ALONG 38S 99W...40S 79W...43S 65W...A 125KT
MAXIMUM AT 42S 53W...EXITING AT 36S 45W.

AT 500 HPA...A SHORT WAVE TROUGH ON THE SOUTHERN STREAM EXTENDS
ALONG 67S 100W...55S 98W...TO 40S 110W. THIS IS FOCUSING SHORT
WAVE VORTICES ACROSS SOUTHERN PORTIONS OF CHILE TO PATAGONIA IN
ARGENTINA. ANOTHER TROUGH TO THE EAST...MEANWHILE...EXTENDS NORTH
ALONG 44W/45W TO 28S.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM OVER THE EASTERN
PACIFIC CENTERS ON A 1017 HPA HIGH AT 30S 97W. SOUTH OF THIS
AXIS...A BROAD TROUGH ON THE SOUTHERN STREAM EXTENDS NORTH ACROSS
THE BELLINGSHAUSEN SEA TO THE SOUTHEAST PACIFIC...WHILE CENTERING
ON AN OCCLUDED 970 HPA LOW AT 72S 86W. THIS EXTENDS A POLAR FRONT
ALONG A 976 HPA LOW AT 73S 83W...71S 60W...A 982 HPA LOW AT 66S
72W...60S 70W...A 986 HPA LOW AT 58S 79W...A 998 HPA LOW AT 50S
80W...45S 83W...A 1006 HPA LOW AT 44S 91W...AND 39S 100W. ANOTHER
FRONT TO THE EAST AND NORTH EXTENDS ALONG A 998 HPA LOW AT 49S
45W...40S 52W...A 1006 HPA LOW AT 48S 66W... NORTHERN
PATAGONIA...TEMUCO CHILE...A 1010 HPA LOW AT 43S 77W...34S
80W...AND 34S 94W. ANOTHER FRONT EXTENDS ALONG A 990 HPA LOW AT
47S 40W...37S 47W...BUENOS AIRES PROVINCE TO CENTRAL ARGENTINA.

ARREAGA...INAMHI (ECUADOR)
DURAN...SENAHMI (PERU)
DAVISON...WPC (USA)
GALVEZ...WPC (USA)