000
AXNT20 KNHC 010559
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT WED APR 01 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 0000 UTC SURFACE ANALYSIS AND GOES-12 SATELLITE
IMAGERY THROUGH 0315 UTC...AND METEOSAT-9 SATELLITE
IMAGERY THROUGH 0530 UTC.

...THE ITCZ...

FROM THE COAST OF LIBERIA NEAR 6N10W...TO THE EQUATOR ALONG 
21W...TO 4S30W...INTO NORTHEASTERN BRAZIL NEAR 8S39W. ISOLATED
STRONG SHOWERS AND THUNDERSTORMS ARE TO THE SOUTH OF 5N TO THE
EAST OF 16W. ISOLATED MODERATE SHOWERS AND POSSIBLE 
THUNDERSTORMS ARE TO THE SOUTH OF 3N BETWEEN 19W AND 30W...
AND TO THE SOUTH OF 10N BETWEEN 40W AND 60W.

...DISCUSSION...

THE GULF OF MEXICO...
A DEEP LAYER TROUGH HAS DEVELOPED IN THE CENTRAL U.S.A.
THIS TROUGH SUPPORTS A COLD FRONT THAT PASSES THROUGH 
SOUTHEASTERN LOUISIANA TO 25N96W TO THE MEXICO COAST NEAR
21N97W. A STATIONARY FRONT CONTINUES FROM 21N97W TO THE TEXAS 
BIG BEND. A DEVELOPING SURFACE BOUNDARY WITH A LOW CENTER IN 
NORTHERN FLORIDA COVERS THE ATLANTIC OCEAN TO THE EAST OF 
CENTRAL FLORIDA...AND PARTS OF THE EAST CENTRAL GULF OF MEXICO.
AN UPPER LEVEL RIDGE IS ON TOP OF FLORIDA IN BETWEEN THE CENTRAL 
U.S.A. TROUGH AND THE STILL-STRONG WESTERN ATLANTIC DEEP LAYER 
TROUGH. STRONG SHOWERS AND THUNDERSTORMS ARE TO THE NORTH OF 28N
TO THE EAST OF 88W...IN THE GULF OF MEXICO AND ACROSS NORTHERN 
FLORIDA. 
     
THE CARIBBEAN SEA...
UPPER LEVEL SOUTHWESTERLY WIND FLOW MOVES FROM NORTHERN COASTAL 
COLOMBIA...ACROSS LA PENINSULA DE LA GUAJIRA...ACROSS THE 
SOUTHEASTERN CARIBBEAN SEA INTO THE ATLANTIC OCEAN. A WEAK
MIDDLE LEVEL CYCLONIC CIRCULATION CENTER IS IN EASTERN NICARAGUA.
A LOW LEVEL TROUGH IS ALONG 67W/68W IN SHORTWAVE INFRARED 
IMAGERY. MULTILAYERED CLOUDS AND POSSIBLE SHOWERS ARE FROM 17N 
TO 22N BETWEEN 66W AND 69W...INCLUDING THROUGH THE MONA PASSAGE.

THE ATLANTIC OCEAN...
A WESTERN ATLANTIC OCEAN DEEP LAYER TROUGH SPREADS CYCLONIC FLOW 
TO THE NORTH OF 30N TO THE WEST OF 40W. THIS TROUGH SUPPORTS
A COLD FRONT THAT PASSES THROUGH 32N52W TO 28N60W TO 26N67W.
A STATIONARY FRONT CONTINUES FROM 26N67W TO 27N75W TO THE WEST
COAST OF CENTRAL FLORIDA. STRONG SHOWERS AND THUNDERSTORMS ARE 
SPREADING EASTWARD...TO THE NORTH OF 28N TO THE WEST OF 79W.
ISOLATED MODERATE SHOWERS ARE TO THE NORTH OF 30N BETWEEN 49W 
AND 52W. BROAD SURFACE ANTICYCLONIC FLOW MOVES AROUND A RIDGE...
FROM A 1022 MB HIGH PRESSURE CENTER NEAR 34N20W TO 31N31W TO
A 1021 MB HIGH PRESSURE CENTER NEAR 28N41W...TO A 1019 MB HIGH 
PRESSURE CENTER NEAR 25N55W...TO 23N70W TO THE BAHAMAS NEAR
25N76W. A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 
MOROCCO TO THE WESTERN SAHARA TO 19N21W.

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MT