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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1430Z Dec 08, 2017)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
930 AM EST FRI DEC 08 2017

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

SYNOPSIS (VALID FROM DEC 08 AT 0000 UTC): AT 200 HPA...A ROBUST
SUBTROPICAL RIDGE/BOLIVIAN HIGH CENTERS OVER MATO GROSSO IN
BRASIL. THE HIGH IS VENTILATING CONVECTION ACROSS MOST OF TROPICAL
SOUTH AMERICA...BUT ESPECIALLY IN EASTERN BRASIL...WHERE
DEEP-LAYER INSTABILITY REMAINS IN PLACE. STRONGEST CONVECTION IS
ORGANIZING IN ASSOCIATION WITH LOW-LEVEL TROUGHS ACROSS
CENTRAL/EASTERN BRASIL...AND INTO MATO GROSSO DO SUL/PANTANAL.
ALSO...SHORT-LIVED DIURNAL CONVECTION IS OCCURRING IN THE PERUVIAN
AND BOLIVIAN ANDES.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR JET EXTENDING
ALONG 56S 120W...57S 99W...EXITING AT 59S 90W. IT REFORMS AT 61S
80W...EXITING AT 50S 58W...IT REFORMS AT 49S 51W...ALONG 50S 27W.
THE NORTHERN POLAR JET EXTENDS ALONG 54S 120W...A 179KT MAXIMA AT
54S 117W...52S 104W...51S 90W...EXITING AT 47S 85W. IT REFORMS AT
43S 76W...EXITING AT 39S 49W. THE SUBTROPICAL JET EXTENDS ALONG
50S 120W...48S 93W...EXITING AT 40S 88W. IT REFORMS AT 27S 75W
ALONG 31S 61W...25S 39W...23S 21W. THE SUBEQUATORIAL JET EXTENDS
ALONG07S 113W...05S 97W...EXITING AT 00 90W.

AT 500 HPA...THE SOUTHERN STREAM IS CHARACTERIZED BY A BROAD
TROUGH WITH SEVERAL WEAK LOWS PROPAGATING FROM WEST TO EAST. ONE
EXTENDS ALONG 110W AND TO THE SOUTH OF55S...A RIDGE FOLLOWS AHEAD
ALONG 80-85W...AND ANOTHER TROUGH IS EXITING THE SOUTHERN CONE
ALONG 60-65W. A TIGHT BELT OF WESTERLIES EXTENDS TO THE NORTH
ALONG60S-50W. IN THE NORTHERN STREAM...A BROAD WEAK LOW EXTENDS
OFF THE COAST OF CHILE CENTERING AT 28S 90W. OVER THE
CONTINENT...A BROAD RIDGE EXTENDS FROM THE ALTIPLANO SOUTH ALONG
70-68W...AND TO THE EAST...A BROAD TROUGH EXTENDS AN AXIS FROM 35S
44W INTO THE RIO DE JANEIRO AREA.

AT LOW LEVELS...A 958 HPA OCCLUDED LOW CENTERS AT 64S 109W...AND
EXTENDS AN OCCLUDED FRONT INTO A 968 HPA TRIPLE POINT LOW AT 76S
94W...63S 93W...A 978 HPA LOW AT 60S 94W...53S 97W...49S 106W. A
982 HPA OCCLUDED LOW CENTERS AT 64S 69W AND EXTENDS A FRONT TO A
984 HPA TRIPLE POINT LOW AT 63S 64W...59S 62W...56S 63W. A 998 HPA
OCCLUDED LOW CENTERS AT 52S 60W AND EXTENDS A FRONT INTO A 1000
HPA TRIPLE POINT LOW AT 53S 58W...49S 58W...47S 62W...A 1002 HPA
LOW AT 47S 67W...41S 67W...AND A WEAKENING FRONT ALONG39S
73W...38S 87W. A 1031 HPA HIGH CENTERS AT 37S 106W. A 1006 HPA LOW
AT 35S 45W EXTENDS A FRONT ALONG 33S 44W...30S 50W...29S 55W.
ISOLATED THUNDERSTORMS WERE OCCURRING IN INTERIOR PORTIONS OF
CENTRAL ARGENTINA IN ASSOCIATION WITH A WEAK UPPER TROUGH CROSSING
THE ANDES.

OVIEDO...SHN (ARGENTINA)
POMIER...SENAMHI (BOLIVIA)
RIVAS...SENAMHI (PERU)
GALVEZ...WPC (USA)