000
AXNT20 KNHC 281752
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
105 PM EST TUE DEC 28 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1715 UTC.

...THE ITCZ...

ITCZ AXIS IS ANALYZED FROM THE COAST OF SIERRA LEONE NEAR 7N13W 
WESTWARD TO THE COAST OF BRAZIL ALONG 4N20W 4N40W 1N50W. WIDELY 
SCATTERED MODERATE CONVECTION IS FROM EQ-3N BETWEEN 10W-17W... 
AND FROM 2N-5N BETWEEN 22W-35W.   

...DISCUSSION...

GULF OF MEXICO...
A 1030 MB HIGH IS CENTERED OVER MISSISSIPPI NEAR 33N88W. A 
SURFACE RIDGE AXIS EXTENDS S FROM THE HIGH CENTER TO THE YUCATAN 
PENINSULA. OVERCAST COLD AIR STRATOCUMULUS CLOUDS ARE OVER THE 
CENTRAL GULF OF MEXICO. OVERCAST LOW CLOUDS HAVE ADVECTED 
OVER NE MEXICO AND TEXAS DUE TO RETURN FLOW. 10-15 KT NE WINDS 
ARE OVER THE E GULF E OF 90W WHILE 10-20 KT SE WINDS OVER THE W 
GULF. TEMPERATURES REMAIN IN THE 40'S OVER THE N GULF STATES. IN 
THE UPPER LEVELS... AN UPPER LEVEL RIDGE IS OVER THE GULF 
PRODUCING WESTERLY WINDS. A PATCH OF UPPER LEVEL MOISTURE AND 
HIGH CLOUDS ARE OVER THE SW GULF. STRONG SUBSIDENCE IS OVER THE 
REMAINDER OF THE GULF. EXPECT...THE SURFACE HIGH TO MOVE SE TO 
CENTRAL FLORIDA IN 24 HOURS. ALSO EXPECT SCATTERED SHOWERS ALONG 
THE TEXAS COAST IN 24 HOURS DUE TO RETURN FLOW.     

CARIBBEAN SEA...
AS OF 1500 UTC...A COLD FRONT EXTENDS FROM THE LEEWARD ISLANDS 
NEAR 20N62W TO THE CENTRAL CARIBBEAN ALONG 15N69W 14N73W 
DISSIPATING TO 10N76W. SCATTERED MODERATE CONVECTION IS NOTED 
WITHIN 30 NM OF 15N75W. BROKEN TO OVERCAST LOW CLOUDS ARE NW OF 
THE FRONT. 20-25 KT TRADEWINDS ARE OVER THE CENTRAL AND E 
CARIBBEAN. IN THE UPPER LEVELS...W TO SW WINDS DOMINATE THE 
CARIBBEAN AND CENTRAL AMERICA. EXPECT...THE FRONT TO BECOME 
QUASI-STATIONARY OVER THE NEXT 24 HOURS WITH SHOWERS.     

ATLANTIC OCEAN...
AS OF 1500 UTC...A COLD FRONT EXTENDS FROM 32N52W TO THE LEEWARD 
ISLANDS NEAR 20N62W. SCATTERED SHOWERS ARE WITHIN 30 NM OF THE 
FRONT. OVERCAST LOW CLOUDS AND COLD AIR ADVECTION IS NW OF THE 
FRONT. GALE FORCE WINDS ARE N OF 26N ON BOTH SIDES OF THE FRONT. 
A 1022 MB HIGH IS OVER THE CENTRAL ATLANTIC NEAR 28N38W. A 
DISSIPATING COLD FRONT EXTENDS OVER THE E ATLANTIC FROM 32N15W 
TO 27N20W 24N25W. IN THE UPPER LEVELS...AN UPPER LEVEL RIDGE IS 
OVER THE E ATLANTIC N OF 20N W OF 65W. AN UPPER LEVEL TROUGH IS 
OVER THE CENTRAL ATLANTIC BETWEEN 45W-65W. AN UPPER LEVEL RIDGE 
IS OVER THE E ATLANTIC E OF 45W. A UPPER LEVEL HIGH IS CENTERED 
OVER THE TROPICAL ATLANTIC NEAR 6N55W. EXPECT...THE W ATLANTIC 
COLD FRONT TO EXTEND FROM 32N40W TO THE LEEWARD ISLANDS IN 24 
HOURS WITH SHOWERS...A GOOD AMOUNT OF COLD AIR ADVECTION...AND  
GALE FORCE WINDS. ALSO EXPECT THE E ATLANTIC FRONT TO MOVE E. 

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

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FORMOSA