000
AXNT20 KNHC 252317
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 PM EDT SAT APR 25 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 5N6W 2N15W 2N30W CROSSING THE 
EQUATOR NEAR 38W TO NE BRAZIL NEAR 3S42W. SCATTERED 
MODERATE TO STRONG CONVECTION IS FROM THE EQUATOR TO 7N E OF 3W. 
ELSEWHERE...SCATTERED MODERATE CONVECTION IS FROM 1N-3S BETWEEN 
12W-17W.

...DISCUSSION...

GULF OF MEXICO...
A 1033 MB HIGH IS CENTERED W OF BERMUDA PRODUCING E TO SE RETURN 
FLOW OVER THE ENTIRE GULF OF MEXICO. 25-30 KT E WINDS ARE OVER 
THE STRAITS OF FLORIDA WHILE 20-25 KT SE WINDS ARE OVER THE 
CENTRAL AND W GULF W OF 90W. BROKEN TO OVERCAST LOW CLOUDS WITH 
ISOLATED SHOWERS ARE ALONG THE COAST OF TEXAS. THE REMAINDER OF 
THE GULF OF MEXICO HAS FAIR WEATHER. IN THE UPPER LEVELS...AN 
UPPER LEVEL TROUGH IS OVER THE GULF WITH AXIS ALONG 95W. STRONG 
SUBSIDENCE COVERS THE GULF EXCEPT OVER TEXAS AND THE TEXAS COAST 
WHERE UPPER LEVEL MOISTURE IS NOTED. EXPECT...THE UPPER LEVEL 
TROUGH TO MOVE E OVER THE NEXT 24 HOURS. ALSO EXPECT LITTLE 
CHANGE IN THE LOWER LEVELS OVER THE NEXT 24 HOURS. 

CARIBBEAN SEA...
FRESH TO STRONG TRADES ARE OVER THE CARIBBEAN SEA WITH STRONGEST 
WINDS W OF 70W. SCATTERED SHOWERS DOTS THE CARIBBEAN AND CENTRAL 
AMERICA ESPECIALLY OVER THE WINDWARD AND LEEWARD ISLANDS... 
PUERTO RICO...HISPANIOLA...JAMAICA...NICARAGUA...HONDURAS... 
THE GULF OF HONDURAS...AND BELIZE. CLUSTERS OF SCATTERED 
MODERATE CONVECTION ARE INLAND OVER GUATEMALA AND S MEXICO. IN 
THE UPPER LEVELS...AN UPPER LEVEL RIDGE IS OVER THE CARIBBEAN. 
CONSIDERABLE UPPER LEVEL MOISTURE IS OVER THE W CARIBBEAN W OF 
80W. STRONG SUBSIDENCE IS OVER THE E CARIBBEAN E OF 80W. 
EXPECT...SHOWERS AND CONVECTION OVER THE CARIBBEAN W OF 70W OVER 
THE NEXT 24 HOURS.

ATLANTIC OCEAN...
A 1033 MB HIGH IS W OF BERMUDA NEAR 34N68W PRODUCING STRONG E 
WINDS OVER FLORIDA AND FAIR WEATHER. THIS SAME HIGH IS PRODUCING 
UNSEASONABLY WARM S WINDS OVER THE ENTIRE EASTERN SEABOARD TO 
MAINE. A STATIONARY FRONT IS OVER THE CENTRAL ATLANTIC ALONG 
32N52W 26N60W 24N66W. SCATTERED SHOWERS ARE WITHIN 60 NM E OF 
THE FRONT. ANOTHER DOMINATE 1037 MB HIGH IS OVER THE E ATLANTIC 
NEAR 41N35W. THIS HIGH IS PRODUCING FAIR WEATHER AND NE-E 
SURFACE FLOW OVER THE ATLANTIC FROM 10N-30N E OF 50W. IN THE 
UPPER LEVELS...ZONAL FLOW IS OVER THE W ATLANTIC N OF 20N W OF 
50W. AN UPPER LEVEL RIDGE IS OVER THE CENTRAL ATLANTIC N OF 20N 
BETWEEN 35W-50W. A SHARP UPPER LEVEL TROUGH IS FURTHER E OVER 
THE E ATLANTIC N OF 20N E OF 35W. IN THE TROPICS AN UPPER LEVEL 
TROUGH IS S OF 20N BETWEEN 30W-50W. AN UPPER LEVEL RIDGE IS S OF 
20N E OF 30W. EXPECT...THE FRONT OVER THE CENTRAL ATLANTIC TO 
DRIFT E WITH SHOWERS OVER THE NEXT 24 HOURS.

$$
FORMOSA