000
AXNT20 KNHC 200544
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
205 AM EDT WED APR 20 2011

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL 
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTION
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 SATELLITE IMAGERY
THROUGH 0515 UTC. 

...THE ITCZ...

FROM LIBERIA NEAR 5N9W...CROSSING THE EQUATOR ALONG 20W...
TO 1S26W 1S33W..TO THE NORTHEASTERN BRAZIL COAST NEAR 3S40W. 
STRONG RAINSHOWERS AND THUNDERSTORMS ARE TO THE SOUTH OF 4N
BETWEEN 14W AND 20W. SCATTERED MODERATE RAINSHOWERS TO
ISOLATED STRONG THUNDERSTORMS ARE TO THE SOUTH OF 5N
BETWEEN 40W AND 50W.

...DISCUSSION...

THE GULF OF MEXICO...
MIDDLE LEVEL TO UPPER LEVEL WESTERLY WIND FLOW SPANS THE AREA. 
OVERCAST LOW CLOUDS AND SOME HAZE ARE IN THE GULF COASTAL
PLAINS FROM THE MIDDLE TEXAS COAST TO TALLAHASSEE FLORIDA.
A WEAK UPPER LEVEL SHORTWAVE TROUGH IS ALONG 27N88W 22N89W.
SOUTHERLY RETURN FLOW WINDS ARE TO THE NORTH OF 23N TO THE 
WEST OF 88W.

THE CARIBBEAN SEA...
BROAD UPPER LEVEL SOUTHERLY-TO-SOUTHWESTERLY WIND FLOW COVERS 
THE AREA TO THE SOUTH OF THE LINE FROM PUERTO RICO TO EASTERN 
HONDURAS. BROAD UPPER LEVEL WESTERLY TO SOUTHWESTERLY WIND FLOW 
SPANS THE REST OF THE AREA. RAINSHOWERS ARE POSSIBLE IN SMALL 
CLUSTERS OF LOW CLOUDS FROM 13N TO 19N BETWEEN 60W AND 70W...
TO THE NORTH OF 16N BETWEEN 70W AND 80W...AND WITHIN 120 NM
TO THE SOUTHWEST OF CUBA BETWEEN JAMAICA AND THE ISLE OF YOUTH.

THE ATLANTIC OCEAN...
AN UPPER LEVEL TROUGH IS ALONG 29N65W 25N59W TO 19N54W.
BROAD UPPER LEVEL CYCLONIC FLOW COVERS THE ATLANTIC OCEAN
TO THE NORTH OF 20N BETWEEN 52W AND THE BAHAMAS. A SURFACE 
TROUGH IS ALONG 27N61W...TO A 1013 MB LOW PRESSURE CENTER THAT 
IS NEAR 22N58W...TO 18N57W. SCATTERED MODERATE RAINSHOWERS TO 
ISOLATED STRONG THUNDERSTORMS ARE FROM 20N TO 27N BETWEEN 50W 
AND 60W. ISOLATED MODERATE RAINSHOWERS COVER THE WATERS FROM
20N TO 30N BETWEEN 60W AND THE BAHAMAS. AN UPPER LEVEL TROUGH 
PASSES THROUGH 32N20W TO 20N30W TO 14N41W. A COLD FRONT PASSES 
THROUGH 33N14W TO 31N17W. A SURFACE TROUGH IS ALONG 30N20W TO
A 1013 MB LOW PRESSURE CENTER THAT IS NEAR 29N20W...TO 25N23W.
RAINSHOWERS ARE POSSIBLE FROM 27N TO 30N BETWEEN 18W AND 22W.
A SURFACE RIDGE PASSES THROUGH 32N44W TO 13N43W.

FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

$$
MT