000
AXNT20 KNHC 280004
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
805 PM EDT WED APR 27 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 2315 UTC.

...THE ITCZ...

ITCZ AXIS IS CENTERED ALONG 7N12W EQ27W 4S32W 4S40W EQ50W. A BIG 
CLUSTER OF NUMEROUS STRONG CONVECTION IS INLAND OVER SIERRA 
LEONE AND GUINEA FROM 8N-12N BETWEEN 8W-14W. ISOLATED MODERATE 
CONVECTION IS FROM 5N-7N BETWEEN 11W-12W...FROM 6N-7N BETWEEN 
16W-18W...FROM 3N-5N BETWEEN 22W-24W. WIDELY SCATTERED MODERATE 
CONVECTION IS ALONG THE COAST OF BRAZIL FROM EQ-4N BETWEEN 
45W-51W.   

...DISCUSSION...

GULF OF MEXICO...
AS OF 2100 UTC...A COLD FRONT EXTENDS FROM S LOUISIANA AT 30N93W 
TO THE NW GULF OF MEXICO TO TAMPICO MEXICO AT 22N98W. 15 KT NW 
WINDS ARE N OF THE FRONT. THE GULF IS VOID OF CONVECTION HOWEVER 
CONVECTION IS INLAND OVER MISSISSIPPI. 15-25 KT S WINDS ARE OVER 
THE REMAINDER OF THE GULF. BROKEN LOW CLOUDS ARE ALONG THE FRONT 
WHILE FAIR WEATHER IS OVER THE REMAINDER OF THE GULF. IN THE 
UPPER LEVELS...AN UPPER LEVEL TROUGH IS OVER THE W GULF W OF 90W 
SUPPORTING THE SURFACE FRONT. ZONAL FLOW IS OVER THE E GULF. 
STRONG SUBSIDENCE IS OVER THE ENTIRE GULF. EXPECT OVER THE NEXT 
24 HOURS FOR...THE COLD FRONT TO EXTEND FROM THE FLORIDA 
PANHANDLE TO THE SOUTHERN BAY OF CAMPECHE WITH CONVECTION.  

CARIBBEAN SEA...
15-20 KT TRADEWINDS ARE OVER THE CENTRAL AND W CARIBBEAN SEA. 
20-25 KT SE WINDS ARE OVER THE W CARIBBEAN AND CENTRAL AMERICA. 
CLUSTERS OF SCATTERED MODERATE TO STRONG CONVECTION IS OVER W 
VENEZUELA...N COLOMBIA...PANAMA...COSTA RICA...AND NICARAGUA 
FROM 2N-11N BETWEEN 70W-81W...AND FROM 8N-13N BETWEEN 83W-86W. 
WIDELY SCATTERED MODERATE CONVECTION IS INLAND OVER CUBA BETWEEN 
76W-80W. SIMILAR CONVECTION IS OVER CENTRAL HISPANIOLA. 
SCATTERED SHOWERS ARE ELSEWHERE PUERTO RICO...AND THE E 
CARIBBEAN E OF 67W. IN THE UPPER LEVELS...ZONAL FLOW DOMINATES 
THE AREA. UPPER LEVEL MOISTURE IS OVER THE S CARIBBEAN AND S 
AMERICA S OF 12N. STRONG SUBSIDENCE IS OVER THE REMAINDER OF OF 
THE CARIBBEAN. EXPECT OVER THE NEXT 24 HOURS FOR... CONTINUED 
CONVECTION OVER THE S CARIBBEAN S OF 12N...AND MORE SHOWERS OVER 
THE E CARIBBEAN E OF 70W. 

ATLANTIC OCEAN...
A 1030 MB HIGH IS OVER THE W ATLANTIC NEAR 34N59W. A SURFACE 
RIDGE AXIS EXTENDS SW TO N FLORIDA. A WEAK 1012 MB LOW IS OVER 
THE E ATLANTIC NEAR 30N24W. SCATTERED SHOWERS ARE W OF THE 
CANARY ISLANDS. IN THE UPPER LEVELS...AN UPPER LEVEL LOW IS OVER 
THE E ATLANTIC NEAR 27N53W WITHS STRONG SUBSIDENCE. ANOTHER 
UPPER LEVEL LOW IS OVER THE E ATLANTIC NEAR 35N20W SUPPORTING 
THE SURFACE LOW. EXPECT OVER THE NEXT 24 HOURS FOR...SHOWERS TO 
BE OVER THE TROPICAL ATLANTIC S OF 15N W OF 50W TO THE LESSER 
ANTILLES. ALSO EXPECT MORE SHOWERS OVER THE BAHAMAS. 

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

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FORMOSA