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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1345Z Jul 22, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
945 AM EDT TUE JUL 22 2014

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

SYNOPSIS (VALID FROM 22 JULY 00UTC): NORTH OVER THE CONTINENT...AT
200 HPA...A NEAR ZONAL WESTERLY FLOW DOMINATES AREA BETWEEN
00N-20S. IN THIS PATTERN...WIDELY ISOLATED AFTERNOON CONVECTION
WAS BUILDING ACROSS PARA-AMAZONAS IN BRASIL. OTHERWISE...FAIR
WEATHER CONDITIONS WERE NOTED ACROSS MOST OF PERU-ECUADOR-BOLIVIA
AND BRASIL.

AT 250 HPA THE SOUTHERN POLAR LIES ALONG 64S 121W...59S 105W...54S
89W...EXITING AT 51S 77W. IT REFORMS AT 36S 69W...ALONG A 126KT
MAXIMUM AT 43S 60W...49S 42W...43S 30W...EXITING AT 34S 25W. THE
NORTHERN POLAR HAS ITS ENTRANCE AT 26S 117W...ALONG 40S 113W...42S
98W...A 125KT MAXIMUM AT 39S 90W...31S 83W...EXITING AT 27S 70W.
THE JET REFORMS AT 33S 68W...ALONG 39S 57W...43S 45W...39S
35W...33S 31W...EXITING AT 30S 27W. THE SUBTROPICAL JET HAS A
FINGER BETWEEN 28S 89W AND 23S 75W. IT REFORMS TO THE NORTH NEAR
18S 90W...ALONG 18S 80W...EXITING AT 20S 69W. A STRONGER BRANCH TO
THE EAST HAS ITS ENTRANCE AT 16S 37W...ALONG 18S 27W...A 126KT
MAXIMUM AT 21S 20W...22S 10W...EXITING AT 21S 13W.

AT 500 HPA...A RIDGE NOW EXTENDS ALONG 24S 97W...40S 100W...50S
110W...TO 53S 130W. A DEEP SHORT WAVE PERTURBATION ON THE SOUTHERN
STREAM IS LIFTING ACROSS THE BELLINGSHAUSEN SEA. THIS IS SLOWLY
MERGING WITH A TROUGH TO THE NORTH THAT EXTENDS FROM TIERRA DEL
FUEGO...ALONG 40S 77W...TO 24S 85W. THIS TROUGH IS FOCUSING SHORT
WAVE ENERGY ACROSS CENTRAL/SOUTHERN PORTIONS OF CHILE. A LONG WAVE
RIDGE TO THE EAST EXTENDS FROM SOUTHEAST BRASIL...ALONG 40S
40W...TO THE SOUTH GEORGIA ISLANDS.

AT LOW LEVELS...A BROAD RIDGE ON THE NORTHERN STREAM IS
INITIALIZED OVER THE EASTERN PACIFIC WHILE CENTERING ON A 1033 HPA
HIGH AT 37S 98W. POLAR FRONTS ARE SLIDING UNDER THIS AXIS...WITH
ONE EXTENDING FROM AN OCCLUDED 970 HPA LOW AT 66S 96W...A 974 HPA
LOW AT 70S 85W...66S 76W...62S 76W...A 989 HPA LOW AT 59S
78W...53S 79W...AND 50S 86W. ANOTHER FRONT TO THE EAST EXTENDS
FROM AN OCCLUDED 990 HPA LOW AT 57S 70W...ALONG A 994 HPA LOW AT
57S 66W...51S 68W...A 1006 HPA LOW AT 49S 70W...44S 68W...42S
72W...A 1018 HPA LOW AT 42S 75W...ARCHIPELAGO DE JUAN FERNANDEZ. A
THIRD BOUNDARY ORIGINATES ON AN OCCLUDED 990 HPA LOW AT 56S
51W...A 1002 HPA LOW AT 50S 46W...42S 46W...40S 54W...A 1010 HPA
LOW AT 39S 59W...35S 63W...MENDOZA...TO A 1018 HPA LOW NEAR LA
SERENA CHILE. THIS SUSTAINS SCATTERED DEEP CONVECTION ACROSS
CENTRAL-NORTHERN ARGENTINA. A RIDGE OVER THE WESTERN ATLANTIC
CENTERS ON A 1025 HPA HIGH AT 31S 38W. AN OLD POLAR FRONT TO THE
EAST AND NORTH LIES ALONG 29S 12W...23S 20W...TO ESPIRITO
SANTO/SOUTHERN BAHIA...WHERE IT SUSTAINS SCATTERED CONVECTION. A
SHEAR LINE EXTENDS FROM 19S 28W TO NORTHERN BAHIA.

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