000
AXNT20 KNHC 090002
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 PM EDT WED APR 08 2009

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL 
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS
OF SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST
FROM THE EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED
ON SATELLITE IMAGERY...METEOROLOGICAL ANALYSIS...WEATHER
OBSERVATIONS...AND RADAR.

BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 2315 UTC.

...THE ITCZ...
FROM SOUTHERN LIBERIA NEAR 4N7W 3N17W...CROSSING THE EQUATOR 
ALONG 24W...TO 1S30W INTO NORTHEASTERN BRAZIL NEAR 3S43W.
ISOLATED AND DISORGANIZED MODERATE SHOWERS ARE TO THE SOUTH
OF 6N TO THE EAST OF 25W.

...DISCUSSION...

THE GULF OF MEXICO...
THE DEEP LAYER TROUGH THAT HAS BEEN DRIVING THE CURRENT ATLANTIC 
OCEAN COLD FRONT...AFTER THIS FRONT MOVED THROUGH THE GULF OF 
MEXICO A FEW DAYS AGO...IS MOVING OUT OF THE AREA. THE TROUGH 
EXTENDS THROUGH 32N73W IN THE ATLANTIC OCEAN TO ANDROS ISLAND IN 
THE BAHAMAS TO THE NORTHWESTERN CORNER OF THE CARIBBEAN SEA NEAR 
20N84W. LOW LEVEL ANTICYCLONIC FLOW MOVES AROUND A 1023 MB HIGH 
PRESSURE CENTER NEAR 25N86W. NEAR-HURRICANE FORCE WINDS WERE 
OBSERVED IN THE GULF OF TEHUANTEPEC ABOUT 30 HOURS AGO. AN UPPER 
LEVEL RIDGE ALONG 100W IN MEXICO IS MOVING EASTWARD.

THE CARIBBEAN SEA...
MOSTLY MIDDLE LEVEL TO UPPER LEVEL WESTERLY AND SOUTHWESTERLY
FLOW COVERS THE OPEN WATERS OF THE AREA. AN UPPER LEVEL RIDGE
THAT RUNS FROM 23N60W IN THE ATLANTIC OCEAN INTO THE 
SOUTHEASTERN CORNER OF THE AREA. SEPARATE UPPER LEVEL 
SOUTHWESTERLY FLOW MOVES FROM SOUTH AMERICA AND CURVES
NORTHWARD AND NORTHEASTWARD IN THE DIRECTION OF THE GREATER 
ANTILLES. A STATIONARY FRONT PASSES THROUGH NORTHWESTERN HAITI 
NEAR 20N73W INTO SOUTHERN NICARAGUA NEAR 12N86W. THIS IS THE 
SOUTHERN PART OF THE ATLANTIC OCEAN COLD FRONT. BROKEN TO 
OVERCAST MULTILAYERED CLOUDS AND POSSIBLE PRECIPITATION ARE
IN PUERTO RICO...HISPANIOLA...CUBA TO THE EAST OF 77W...
JAMAICA...AND NICARAGUA TO THE NORTH OF 12N.

THE ATLANTIC OCEAN...
THE CURRENT COLD FRONT PASSES THROUGH 32N61W TO 25N66W TO 
NORTHWESTERN HAITI NEAR 20N73W. A STATIONARY FRONT CONTINUES 
INTO THE CARIBBEAN SEA FROM 20N73W TO SOUTHERN NICARAGUA NEAR 
12N86W. THE TROUGH THAT SUPPORTS THIS FRONT PASSES THROUGH 
32N73W IN THE ATLANTIC OCEAN TO ANDROS ISLAND IN THE BAHAMAS
TO THE NORTHWESTERN CORNER OF THE CARIBBEAN SEA NEAR 20N84W.
A MIDDLE LEVEL TO UPPER LEVEL TROUGH IS ALONG 31N46W TO 26N44W 
22N44W TO 12N43W. A SURFACE TROUGH IS IN THE MIDDLE OF BROAD
LOW LEVEL ANTICYCLONIC FLOW...ALONG 27N45W 23N48W 19N50W.
THE ANTICYCLONIC FLOW IS AROUND A 1029 MB HIGH PRESSURE CENTER
NEAR 36N42W. THIS ANTICYCLONIC FLOW IS TO THE EAST OF THE 32N73W
20N84W COLD FRONT. THE SOUTHERNMOST POINT OF A DEEP LAYER
EASTERN ATLANTIC OCEAN TROUGH IS 33N30W. THIS TROUGH SUPPORTS
A COLD FRONT THAT IS TO THE NORTH OF THE AREA.

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MT