000
AXNT20 KNHC 242354
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 PM EDT FRI APR 24 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...
ITCZ AXIS IS CENTERED ALONG 5N8W CROSSING THE EQUATOR NEAR 
20W CONTINUING ALONG 1S35W AND INTO NE BRAZIL NEAR 3S41W. 
CLUSTERS OF SCATTERED MODERATE/ISOLATED STRONG CONVECTION IS 
FROM 1S-4S BETWEEN 4W-7W...FROM 4N-2S BETWEEN 14W-26W...AND FROM 
1S-3S BETWEEN 33W-36W.

...DISCUSSION...

GULF OF MEXICO...
AS OF 2100 UTC...A 1025 MB HIGH IS CENTERED OVER THE NE GULF OF 
MEXICO NEAR 29N86W PRODUCING FAIR WEATHER. 5-10 KT ANTICYCLONIC 
SURFACE WINDS ARE OVER THE NE GULF...WHILE 20-25 KT E WINDS ARE 
OVER THE STRAITS OF FLORIDA. SIMILAR 20 KT SE WINDS ARE OVER THE 
CENTRAL AND W GULF W OF 90W. LOW LEVEL HAZE IS OVER THE BAY OF 
CAMPECHE AND THE W GULF W OF 92 DUE TO SMOKE. IN THE UPPER 
LEVELS...ZONAL FLOW IS OVER THE GULF. STRONG SUBSIDENCE COVERS 
THE ENTIRE GULF ENHANCING THE FAIR WEATHER. EXPECT...THE SURFACE 
HIGH TO DISSIPATE OVER THE NEXT 24 HOURS. FRESH TO STRONG SE 
SURFACE RETURN FLOW WILL THEN DOMINATE THE ENTIRE GULF OF 
MEXICO. ALSO EXPECT SCATTERED SHOWERS ALONG THE COAST OF 
TEXAS...AND FAIR WEATHER OVER THE E GULF AND FLORIDA. 

CARIBBEAN SEA... 
FRESH TO STRONG TRADES ARE OVER THE CARIBBEAN SEA WITH STRONGEST 
WINDS W OF 70W. SCATTERED SHOWERS ARE OVER THE LEEWARD 
ISLANDS...PUERTO RICO...HISPANIOLA...HONDURAS...AND THE GULF OF 
HONDURAS. CLUSTERS OF SCATTERED MODERATE TO ISOLATED STRONG 
CONVECTION ARE INLAND OVER E PANAMA...AND OVER GUATEMALA. IN THE 
UPPER LEVELS...AN UPPER LEVEL RIDGE IS OVER THE CARIBBEAN. 
CONSIDERABLE UPPER LEVEL MOISTURE IS OVER THE CARIBBEAN W OF 
70W. STRONG SUBSIDENCE IS OVER THE E CARIBBEAN E OF 70W. 
EXPECT...SHOWERS AND CONVECTION OVER THE W CARIBBEAN W OF 80W 
OVER THE NEXT 24 HOURS.

ATLANTIC OCEAN...
A COLD FRONT IS OVER THE W ATLANTIC ALONG 32N57W 27N64W. A 
STATIONARY FRONT CONTINUES TO THE SOUTHERN BAHAMAS NEAR 21N74W. 
SCATTERED SHOWERS ARE WITHIN 60 NM E OF THE FRONTS. A DOMINATE 
1037 MB HIGH IS OVER THE CENTRAL ATLANTIC NEAR 41N41W. THIS HIGH 
IS PRODUCING FAIR WEATHER AND NE SURFACE FLOW OVER THE ATLANTIC 
FROM 10N-30N E OF 60W. IN THE UPPER LEVELS...ZONAL FLOW IS OVER 
THE W ATLANTIC W OF 70W. A SHARP UPPER LEVEL RIDGE IS OVER THE 
CENTRAL ATLANTIC WITH AXIS FROM THE WINDWARD ISLANDS NEAR 11N62W 
TO BEYOND 32N46W. A SHARP UPPER LEVEL TROUGH IS FURTHER E OVER 
THE E ATLANTIC WITH AXIS FROM NE BRAZIL NEAR 2N50W TO BEYOND 
32N28W. AN UPPER LEVEL HIGH IS CENTERED OVER W AFRICA NEAR 
12N8W. A RIDGE AXIS EXTENDS W FROM THE HIGH TO 10N30W. EXPECT... 
THE FRONT OVER THE W ATLANTIC TO MOVE E WITH CONVECTION TO 
32N49W OVER THE NEXT 24 HOURS.

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FORMOSA