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South American Synoptic Discussion
 
(Caution: Version displayed is not the latest version. - Issued 1344Z Aug 06, 2014)
 
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SOUTH AMERICA SYNOPTIC DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
944 AM EDT WED AUG 06 2014

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

SYNOPSIS (VALID FROM 06 AUGUST): AT 200 HPA...A SHORT WAVE RIDGE
EXTENDS ACROSS PERU TO THE EASTERN TROPICAL PACIFIC. A TROUGH TO
THE EAST EXTENDS NORTH ACROSS NORTHERN CHILE-SOUTHERN PERU TO
AMAZONAS IN BRASIL. THE RIDGE/TROUGH ALOFT CONTINUE VENTING DEEP
CONVECTION ACROSS PORTIONS OF PARA-RORAIMA AND AMAZONAS IN
BRASIL...AS WELL AS OVER SOUTHERN COLOMBIA TO NORTHERN
PERU/EASTERN ECUADOR. CENTRAL AND EASTERN BRASIL ARE UNDER
INFLUENCE OF AN UPPER LOW AND A SHORT WAVE RIDGE...WITH UPPER LOW
CENTERING NEAR 07S 47W AND THE RIDGE ON A HIGH AT 19S 57W. AT MID
LEVELS...A PERSISTENT RIDGE OVER BRASIL SUSTAINS A TRADE WINDS CAP
ACROSS CENTRAL-EASTERN PORTIONS.

THE 250 HPA JET ANALYSIS SHOWS THE SOUTHERN POLAR WITH ENTRANCE AT
39S 128W...ALONG A 158KT MAXIMUM AT 46S 112W...EXITING AT 47S
101W. IT REFORMS AT 50S 114W...ALONG 51S 106W...56S 98W...62S
91W...EXITING AT 62S 78W. IT REFORMS AT 54S 48W...EXITING AT 44S
37W. THE NORTHERN POLAR HAS ITS ENTRANCE AT 30S 89W...ALONG A
131KT MAXIMUM AT 32S 80W...36S 76W...A 178KT MAXIMUM AT 40S
71W...44S 61W...A 160KT MAXIMUM AT 45S 50W...A 161KT MAXIMUM AT
37S 40W...EXITING AT 30S 35W. THE SUBTROPICAL JET HAS ITS ENTRANCE
AT 23S 97W...ALONG 24S 86W...29S 76W...38S 62W...37S 48W...A 136KT
MAXIMUM AT 30S 40W...EXITING AT 23S 33W.

AT 500 HPA...HIGHLY AMPLIFIED SINUSOIDAL WAVE PATTERN PERSISTS
ACROSS THE ENTIRE DOMAIN. IN THIS PATTERN...A LONG WAVE TROUGH
EXTENDS FROM 63S 118W...ALONG 45S 120W...TO 20S 135W. A RIDGE LIES
TO THE EAST...WITH AXIS SOUTHWEST ALONG 30S 105W...45S 90W...55S
80W...TO 60S 70W. DOWNSTREAM FROM THIS RIDGE ANOTHER TROUGH
EXTENDS FROM PATAGONIA IN ARGENTINA...ALONG 40S 80W...30S 85W...TO
25S 85W. THIS IS FOCUSING SHORT WAVE ENERGY ACROSS CENTRAL CHILE
TO CUYO/CENTRAL PROVINCES IN ARGENTINA. ANOTHER RIDGE LIES OVER
THE WESTERN ATLANTIC...WITH AXIS NORTH-TO-SOUTH BETWEEN 60W-45W TO
60S. LASTLY...A HIGH AMPLITUDE LONG WAVE TROUGH OVER THE SOUTH
ATLANTIC EXTENDS NORTH FROM A CLOSED LOW AT 53S 28W...ALONG 40S
30W...30S 35W...TO 20S 40W.

AT LOW LEVELS...A RIDGE ON THE NORTHERN STREAM DOMINATES FLOW OVER
THE EASTERN PACIFIC AS IT CENTERS ON A 1029 HPA HIGH AT 32S 99W.
EAST OF THIS AXIS...A POLAR TROUGH EXTENDS ACROSS THE SOUTHERN
CONE WHILE ANCHORING ON AN OCCLUDED 986 HPA LOW AT 53S 64W. THIS
EXTENDS A FRONT ALONG A 992 HPA LOW AT 54S 61W...51S 58W...A 996
HPA LOW AT 48S 57W...44S 56W...43S 60W...A 1002 HPA LOW AT 43S
64W...39S 66W...38S 69W...A 1014 HPA LOW AT 37S 74W...31S
77W...26S 84W...AND 23S 92W. A RIDGE TO THE EAST DOMINATES FLOW
ACROSS SOUTHEAST BRASIL WHILE CENTERING ON A 1029 HPA HIGH AT 28S
49W. AN ELONGATED FRONT TO THE EAST AND NORTH LIES ALONG A 1002
HPA LOW AT 40S 22W...37S 22W...33S 25W...A 1010 HPA LOW AT 30S
26W...24S 30W...20S 36W...VITORIA-SOUTHERN MINAS GERAIS-MATO
GROSSO DO SUL-MISIONES ARGENTINA...TO A 1014 HPA LOW AT 27S
57W...TO SANTA CRUZ IN EASTERN BOLIVIA.

JALFIN...SMN (ARGENTINA)
GALVEZ...WPC (USA)
DAVISON...WPC (USA)