Prognostic Meteorological Discussion
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000
FXSA20 KWBC 051332
PMDSA

SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
931 AM EDT WED AUG 05 2015

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

SYNOPSIS (VALID FROM AUG 05 AT 0000 UTC): THE 200 HPA ANALYSIS
SHOWS A NORTHERN HEMISPHERE LOW THAT CENTERS OVER SOUTHERN
VENEZUELA...ANCHORING A SHORT WAVE TROUGH ACROSS THE NORTHERN
STATES OF BRASIL. THIS TROUGH IS ENHANCING DIURNAL CONVECTION
ACROSS AMAZONAS IN BRASIL TO THE NORTHERN JUNGLE OF PERU/SOUTHERN
COLOMBIA. OTHERWISE...FAIR WEATHER CONDITIONS PREVAIL ACROSS MOST
OF BRASIL-BOLIVIA AND PERU.

THE 250 HPA ANALYSIS SHOWS THE SOUTHERN POLAR JET FORMING AT 44S
109W EXITING AT 44S 91W. IT REFORMS AT 41S 82W ALONG A 134KT
MAXIMA AT 45S 78W...54S 71W...46S 54W...37S 29W...39S 15W...A
135KT MAXIMA AT 45S 05W. THE NORTHERN POLAR FORMS AT 34S 136 ALONG
35S 99W...34S 84W...44S 68W...EXITING AT 41S 59W. IT REFORMS AT
35S 56W ALONG A 139KT MAXIMA AT 35S 45W...32S 30W...A 145KT MAXIMA
AT 34S 19W...37S 07. THE SUBTROPICAL JET EXTENDS ALONG A 174KT
MAXIMA AT 33S 130W...A 193KT MAXIMA AT 34S 110W...A 163KT MAXIMA
AT 31S 90W...29S 80W...EXITING AT 30S 71W. IT REFORMS AT 30S 48W
ALONG 28S 30W...EXITING AT 29S 17W.

AT 500 HPA...AMPLIFYING TROUGH ON THE SOUTHERN STREAM EXTENDS FROM
70S 95W...ALONG 50S 95W...TO 40S 105W. THIS IS PHASING WITH A
TROUGH TO THE NORTH THAT EXTENDS FROM 50S 85W...ALONG 40S
80W...30S 85W...TO 24S 90W. THIS IS FOCUSING SHORT WAVE ENERGY
ACROSS CHILE INTO ARGENTINA...WHERE IT IS SUPPORTING CONVECTION. A
RIDGE TO THE EAST EXTENDS ALONG 65W...WHILE FARTHER EAST...BROAD
TROUGH DOMINATES THE FLOW BETWEEN 40W-00W AND TO THE SOUTH OF 25S.

THE SURFACE ANALYSIS SHOWS A 950 HPA LOW AT 53S 85W EXTENDING AN
OCCLUDED FRONT INTO 49S 86W...54S 85W...A 958 HPA TRIPLE POINT LOW
AT 55S 82W...A COLD FRONT ALONG 53S 79W...A 966 HPA LOW AT 51S
79W...49S 76W...41S 76W...A 998 HPA LOW AT 36S 80W...33S 81W.
RAINFALL WAS BEING REPORTED FROM CONCEPCION SOUTH INTO AYSEN IN
CHILE. A 1014 HPA LOW AT 31S 22W EXTENDS A FRONT ALONG 28S
26W...27S 33W...27S 40W...29S 49W...A 1010 HPA LOW AT 30S
59W...27S 63W. RAINFALL WAS OCCURRING IN SOUTHERN BRASIL AND
URUGUAY/NORTHEASTERN ARGENTINA. A 1021 HPA HIGH CENTERS AT 38S 54W.

ROMERO...DMC (CHILE)
FARINA...DMH (PARAGUAY)
GALVEZ...WPC (USA)
DAVISON...WPC (USA)

$$




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