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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1325Z Jul 17, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
925 AM EDT THU JUL 17 2014

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

SYNOPSIS (VALID FROM 17 JULY 00UTC): THE 200 HPA ANALYSIS SHOWS AN
ILL ORGANIZED RIDGE EXTENDING EAST-TO-EAST ACROSS NORTHERN SOUTH
AMERICA WHILE CONFINING TO AREA NORTH OF 05S. THE RIDGE ALOFT IS
VENTING ISOLATED CONVECTION ACROSS AMAPA/ILHA DE MARAJO AND ACROSS
PORTIONS OF PARA-AMAZONAS IN BRASIL. CONVECTIVE CELLS ARE
SPREADING ACROSS NORTHERN JUNGLE OF PERU INTO EASTERN ECUADOR.

THE 250 HPA JET ANALYSIS SHOWS THE NORTHERN POLAR WITH AXIS ALONG
30S 120W...32S 115W...A 166KT MAXIMUM AT 40S 107W...43S 99W...A
139KT MAXIMUM AT 46S 90W...46S 83W...A 141KT MAXIMUM AT 42S
77W...37S 72W...35S 65W...37S 57W...43S 49W...51S 38W...54S
21W...AND 46S 06W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT 14S
81W...ACROSS SOUTHERN PERU/NORTHERN BOLIVIA...14S 60W...15S
49W...16S 40W...18S 30W...22S 20W...AND 24S 10W.

AT MID LEVELS...A TROUGH EXTENDS OVER THE SOUTH PACIFIC BETWEEN
135W-105W TO 20S. THIS IS PRESSING AGAINST A RIDGE TO THE
EAST...WITH THE LATTER EXTENDING SOUTH ALONG 87W/90W. DOWNSTREAM
FROM THIS RIDGE...A TROUGH EXTENDS NORTH ACROSS CHILE/ARGENTINA TO
25S. ANOTHER RIDGE TO THE EAST LIES ALONG 30W AND TO THE SOUTH OF
36S. NORTH OF THIS AXIS...IN A SPLIT FLOW PATTERN...A TROUGH
EXTENDS ALONG 30S 20W...30S 30W...TO 27S 35W.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM CENTERS ON A 1025
HPA HIGH AT 33S 83W. A POLAR FRONT TO THE SOUTH EXTENDS ALONG A
1018 HPA LOW AT 40S 64W...36S 67W...36S 72W...39S 77W...A 1010 HPA
LOW AT 48S 83W...41S 84W...40S 89W...A 1006 HPA LOW AT 44S
96W...AND 41S 97W. AN OCCLUDED 986 HPA LOW AT 56S 47W EXTENDS A
FRONT ALONG A 998 HPA TRIPLE POINT LOW AT 58S 38W...53S 31W...51S
37W...A 1010 HPA LOW AT 49S 44W...42S 45W...36S 49W... NORTHERN
URUGUAY...A 1014 HPA LOW AT 30S 58W...TO JUJUY/SALTA. A RIDGE TO
THE EAST CENTERS ON A 1037 HPA HIGH AT 40S 30W. AN OLD FRONT TO
THE FRONT LIES ALONG 17S 20W...18S 29W...TO RIO DE JANEIRO...WHERE
IT SUSTAINS SCATTERED COASTAL CONVECTION. A PREFRONTAL SHEAR LINE
EXTENDS FROM 16S 24W TO NORTHERN BAHIA...WHERE IT IS ENHANCING
MOISTURE CONVERGENCE.

FERNANDES...INMET (BRASIL)
JALFIN...SMN (ARGENTINA)
DAVISON...WPC (USA)