NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION SOUTH AMERICAN DESK
1447 UTC NOVEMBER 19 1999

SYNOPSIS:  AT 19/0000 UTC...THE CENTER OF THE 200 HPA RIDGE IS
LOCATED OVER NORTHERN AMAZONIA NEAR 06S 58W. A RIDGE AXIS EXTENDS SW
TO NEAR 10S 65W...THEN WEST THROUGH CNTL PERU...THEN NW TO 05S 89W.
THIS SUPPORTED DEEP CONVECTION ACROSS MUCH OF WESTERN AMAZONIA AND
PERU...WHERE NEAR 75 MM OF PCPN WAS REPORTED...DURING THE PAST 24
HRS.  DEEP MOISTURE IS ASSOCIATED WITH THE RIDGE AND COVERS MUCH OF
AMAZONIA...PERU...ECUADOR...MATO GROSSO...MATO GROSSO DO SUL...
TOCANTINS...GOIAS AND NE BRAZIL.

THE 250 HPA ANALYSIS SHOWS THE SUBTROPICAL JET CONTINUING TO HAVE A
MAJOR IMPACT ON WEATHER ACROSS THE MID-LATITUDES. IT EXTENDS IN THE
PACIFIC FROM 20S 102W EASTWARD THROUGH 30S 84W...SERENA CHILE...
THEN NE THROUGH CNTL PARAGUAY...MATO GROSSO DO SUL...THE EAST
THROUGH MINAS GERAIS...THEN ESE INTO THE ATLANTIC TO NEAR 25S 22W.
THE NORTH POLAR JET IS VERY WEAK TODAY. IT EXTENDS FROM THE PACIFIC
NEAR 43S 110W...EAST THROUGH 48S 95W...CNTL PATAGONIA...WEAKENING
OVER THE FALKLAND ISLANDS. THE SOUTH POLAR JET EXTENDS FROM 49S
120W...EAST THROUGH A 130 KNOT JET MAX AT 51S 100W...TIERRA DEL
FUEGO...A 110 KNOT JET MAX AT 56S 50W...INTO THE ATLANTIC NEAR 53S
20W. 

AT 500 HPA...THERE IS A GENERAL BROAD TROUGH ACROSS THE MAP FROM THE
SOUTH PACIFIC TO THE SOUTH ATLANTIC WITH SEPARATE STREAMS. THE
SOUTHERN STREAM HAS AN ANCHORING CLOSED LOW OVER THE SOUTH PACIFIC
NEAR 70S 95W. A TROUGH AXIS EXTENDS NNW TO 57S 108W. ON THE NORTH
SIDE OF THE THIS SYSTEM THERE IS A VORT MAX WHICH EXTENDS FROM 53S
85W WESTWARD TO 50S 130W. IN THE NORTHERN STREAM...THERE ARE THREE
SYSTEMS OF SIGNIFICANCE. ONE IS IN THE PACIFIC NEAR 37S 95W. ANOTHER
IS AN OPEN WAVE NEAR THE COAST OF BAHIA BLANCA...40S 62W. A TROUGH
AXIS EXTENDS NORTH THROUGH CNTL ARGENTINA INTO W. PARAGUAY. IN THE
ATLANTIC...THE CLOSED LOW REMAINS WITH A CENTER NEAR 38S 29W. THE
TROUGHING EXTENDS NW TO THE COAST OF RIO DE JANEIRO. THERE IS A
SHORT WAVE RIDGE AXIS BETWEEN THE BAHIA BLANCA SYSTEM AND THE
ATLANTIC SYSTEM. THE RIDGE AXIS EXTENDS FROM 50S 45W NW INTO RIO
GRANDE DO SUL AND PARANA.

AT THE SFC...THE SHEAR LINE REMAINS ALONG THE COAST OF NE BRAZIL
NEAR SALVADOR. IT IS BEING SUPPORTED BY THE ATLANTIC 500 HPA SYSTEM.
A 1007 HPA SFC LOW AND FRONTAL SYSTEM IS ASSOCIATED WITH THE 500 HPA
WAVE NEAR BAHIA BLANCA. THE LOW IS OVER BAHIA BLANCA AND THE FRONT
WEAKENS AS IT EXTENDS NNW INTO THE NW PROVINCE OF ARGENTINA. THIS
SUPPORTED DEEP CONVECTION WITH THE LOW AND ALONG THE BOUNDARY IN
BUENOS AIRES AND ESPECIALLY IN THE NW PROVINCE WHERE PCPN AMOUNTS AS
HIGH AS 75 MM WERE REPORTED. TO THE SOUTH...A FRONT EXTENDS FROM 70S
75W NORTH TO 60S 70W...THEN NW THROUGH 50S 90W...45S 120W. 

JACOME..................INAMHI (ECUADOR)
SANDOVAL................DMC (CHILE)
RAUSCH..................NCEP (HPC)

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