000
AXNT20 KNHC 302349
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT FRI APR 30 2010

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...
THE ITCZ AXIS IS CENTERED ALONG 6N10W 4N20W 3N40W TO THE 
NORTHEASTERN COAST OF BRAZIL NEAR 2N50W. WIDELY SCATTERED 
MODERATE CONVECTION IS FROM 4N-6N BETWEEN 15W-19W...AND FROM  
5N-8N BETWEEN 31W-33W. ISOLATED MODERATE CONVECTION IS FROM 
4N-6N BETWEEN 38W-43W. 

...DISCUSSION...

THE GULF OF MEXICO...
A 1023 MB HIGH IS CENTERED OVER THE W ATLANTIC NEAR 29N68W 
PRODUCING SURFACE SOUTHERLY RETURN FLOW OVER THE GULF OF 
MEXICO. THE SURFACE GRADIENT TIGHTENS OVER THE W GULF W OF 87W 
WHERE 20-25 KT SE WINDS ARE NOTED. THE REMAINDER OF THE GULF HAS 
15 KT SE SURFACE FLOW. SMOKE AND HAZE IS NOTED OVER THE W GULF W 
OF 90W MOVING NW. RADAR IMAGERY SHOWS RAIN AND THUNDERSTORMS 
OVER THE NE GULF AND THE FLORIDA PANHANDLE FROM 29N-31N BETWEEN 
82W-88W. THE REMAINDER OF THE GULF HAS MOSTLY FAIR WEATHER. IN 
THE UPPER LEVELS...ZONAL FLOW COVERS THE ENTIRE GULF. STRONG 
SUBSIDENCE COVERS THE THE ENTIRE GULF EXCEPT OVER THE FLORIDA 
PANHANDLE. EXPECT OVER THE NEXT 24 HOURS FOR...SCATTERED SHOWERS 
OVER LOUISIANA AND THE LOUISIANA COAST DUE TO AN APPROACHING 
COLD FRONT. ALSO EXPECT CONVECTION OVER THE YUCATAN PENINSULA 
DUE TO TROPICAL MOISTURE FROM THE SOUTH. 

THE CARIBBEAN SEA...
SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS OVER CENTRAL 
AMERICA FROM PANAMA TO HONDURAS. SIMILAR CONVECTION IS ALONG THE 
COAST OF NICARAGUA FROM 13N-15N BETWEEN 82W-84W. SCATTERED 
MODERATE CONVECTION IS ALSO OVER INLAND CUBA FROM 21N-22N 
BETWEEN 77W-78W. IMAGERY OVER PUERTO RICO SHOWS ISOLATED 
SHOWERS. SIMILAR SHOWERS ARE OVER INLAND HISPANIOLA. 15-25 KT 
TRADEWINDS ARE NOTED THROUGHOUT THE CARIBBEAN SEA WITH STRONGEST 
WINDS OVER THE W CARIBBEAN N OF HONDURAS. IN THE UPPER LEVELS... 
AN UPPER LEVEL HIGH IS CENTERED OVER THE W CARIBBEAN NEAR 
14N84W. AN UPPER LEVEL RIDGE AXIS EXTENDS E TO GUADELOUPE. 
CONSIDERABLE UPPER LEVEL MOISTURE IS OVER THE W CARIBBEAN AND 
CENTRAL AMERICA W OF 80W. STRONG SUBSIDENCE IS OVER THE E 
CARIBBEAN. EXPECT...CONTINUED CONVECTION OVER THE SW CARIBBEAN 
AND CENTRAL AMERICA OVER THE NEXT 24 HOURS.   

THE ATLANTIC OCEAN...
A 1023 MB HIGH IS CENTERED OVER THE W ATLANTIC NEAR 29N68W 
PRODUCING FAIR WEATHER. A COLD FRONT EXTENDS FROM THE CENTRAL 
ATLANTIC NEAR 32N44W TO N OF PUERTO RICO ALONG 25N50W 21N60W 
21N69W. SCATTERED MODERATE CONVECTION IS WITHIN 60 NM OF THE 
FRONT N OF 27N. A 1025 MB HIGH IS OVER THE AZORES NEAR 39N29W. A 
RIDGE AXIS EXTENDS SW TO 28N35W. IN THE UPPER LEVELS...AN UPPER 
LEVEL RIDGE IS OVER THE W ATLANTIC N OF 20N W OF 70W. AN UPPER 
LEVEL TROUGH IS N OF 20N BETWEEN 40W-70W. A SHARP UPPER LEVEL 
RIDGE IS BETWEEN 30W-40W. AN UPPER LEVEL TROUGH IS OVER THE E 
ATLANTIC N OF 10N E OF 30W.  

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

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FORMOSA