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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1317Z Apr 14, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
917 AM EDT MON APR 14 2014

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

SYNOPSIS (VALID FROM 14 APRIL 00UTC): AT 200 HPA...NARROW AND
ELONGATED CELL OF THE SUBTROPICAL RIDGE NOW EXTENDS FROM
PERU...ACROSS BOLIVIA...MATO GROSSO-RIO DE JANEIRO IN BRASIL TO
THE ATLANTIC ALONG 30S 30W. THE SUBEQUATORIAL RIDGE TO THE NORTH
CENTERS ON A CLOSED HIGH NEAR 05S 41W...WITH AXIS NORTHWEST INTO
THE GUIANAS/VENEZUELA. THE SUBTROPICAL RIDGE TO THE SOUTH IS
VENTING CONVECTION ACROSS BOLIVIA...RONDONIA-ACRE/SOUTHERN
AMAZONAS IN BRASIL TO CENTRAL PERU. THE SUBEQUATORIAL RIDGE TO THE
NORTH...MEANWHILE...IS VENTING DEEP CONVECTION ALONG THE NEAR
EQUATORIAL TROUGH ACROSS EQUATORIAL SOUTH AMERICA.

AT 250 HPA...THE SOUTHERN POLAR LIES ALONG A 120KT MAXIMUM AT 58S
120W...64S 99W...A 127KT MAXIMUM AT 61S 70W...EXITING AT 56S 44W.
IT REFORMS AT 55S 35W...ALONG 56S 22W...AND 147KT MAXIMUM AT 55S
10W.THE NORTHERN POLAR LIES ALONG 38S 120W...A 144KT MAXIMUM AT
39S 105W...42S 98W...49S 89W...51S 79W...49S 74W...EXITING AT 42S
69W. IT REFORMS AT 32S 58W...RIO GRANDE DO SUL...32S 47W...39S
37W...50S 27W...A 140KT MAXIMUM AT 52S 16W...49S 04W...43S
01W...EXITING AT 37S 05W. THE SUBTROPICAL JET HAS ITS ENTRANCE AT
33S 116W...THEN ALONG A 168KT MAXIMUM AT 37S 101W...40S 90W...44S
82W...40S 76W...EXITING AT 33S 70W. IT REFORMS AT 28S
67W...RESISTENCIA ARGENTINA...PARANA IN SOUTHERN BRASIL...28S
48W...A 132KT MAXIMUM AT 33S 40W...36S 35W...42S 28W...45S
19W...EXITING AT 44S 12W.

AT 500 HPA...A TROUGH ALONG 100W/105W TO 33S IS PRESSING AGAINST A
RIDGE TO THE EAST...AS THE LATTER EXTENDS FROM A CLOSED HIGH NEAR
30S 88W TO JUST WEST OF TIERRA DEL FUEGO. EAST OF THIS AXIS...OVER
THE SOUTH ATLANTIC...A TROUGH EXTENDS TO THE NORTHWEST FROM A
CLOSED LOW NEAR 44S 41W...ACROSS RIO GRANDE DO SUL IN BRASIL TO
CORRIENTES IN ARGENTINA.

AT LOW LEVELS...THE SURFACE ANALYSIS SHOWS A RIDGE ON THE NORTHERN
STREAM OVER THE EASTERN PACIFIC THAT CENTERS ON A 1025 HPA HIGH AT
32S 88W. AN ELONGATED POLAR FRONT TO THE SOUTH ORIGINATES ON AN
OCCLUDED 1002 HPA LOW AT 52S 68W...ALONG A 1002 HPA LOW AT 50S
63W...44S 61W...A 1010 HPA LOW AT 43S 65W...38S 67W...36S
71W...37S 74W...42S 79W...A 1004 HPA LOW AT 43S 87W...37S
94W...AND 34S 102W. OVER THE ATLANTIC...A DEEP 978 HPA LOW AT 43S
41W ANCHORS A BROAD TROUGH...WITH ASSOCIATED FRONT EXTENDING ALONG
A 1000 HPA LOW AT 50S 25W...46S 25W...A 1000 HPA LOW AT 45S
30W...41S 29W...A 1008 HPA LOW AT 39S 32W...31S 35W...24S 45W...A
1014 HPA LOW AT 23S 51W...18S 57W...TO 16S 65W. SCATTERED
CONVECTION WAS BUILDING ALONG AND NORTH OF THIS BOUNDARY. A POLAR
RIDGE TO THE SOUTH CENTERS ON A 1025 HPA HIGH OVER ARGENTINA NEAR
31S 63W.

ITA...SENAMHI (PERU)
FERNANDES...INMET (BRASIL)
DAVISON...WPC (USA)