000
AXNT20 KNHC 271726
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
105 PM EST MON DEC 27 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 5N20W 4N30W 2N40W 2N51W. 
WIDELY SCATTERED MODERATE CONVECTION IS FROM 2N-6N BETWEEN 
21W-34W.    

...DISCUSSION...

GULF OF MEXICO...
A 1031 MB HIGH IS CENTERED OVER ARKANSAS NEAR 35N92W. A SURFACE 
RIDGE AXIS EXTENDS S TO THE YUCATAN PENINSULA. OVERCAST COLD AIR 
STRATOCUMULUS CLOUDS ARE OVER THE GULF OF MEXICO. MORE OVERCAST 
LOW CLOUDS HAS ADVECTED OVER MEXICO FROM TAMPICO TO VERACRUZ. 
20-25 KT NW WINDS ARE OVER THE E GULF E OF 90W WHILE 5-10 KT 
WINDS OVER THE W GULF. TEMPERATURES ARE IN THE 30'S AND 40'S 
OVER THE N GULF STATES. IN THE UPPER LEVELS... AN UPPER LEVEL 
TROUGH IS OVER THE GULF WITH AXIS ALONG 80W SUPPORTING THE 
SURFACE FRONT OVER THE W ATLANTIC. EXPECT...CONTINUED SURFACE 
HIGH PRESSURE RIDGING OVER THE GULF FOR THE NEXT 24 HOURS WITH 
SCATTERED SHOWERS NEAR TAMPICO MEXICO DUE TO RETURN FLOW.   

CARIBBEAN SEA...
AS OF 1500 UTC...A COLD FRONT EXTENDS FROM HAITI TO COSTA RICA 
ALONG 20N72W 15N79W 10N83W. BROKEN TO OVERCAST LOW CLOUDS ARE 
OVER THE NW CARIBBEAN AND CUBA NW OF THE FRONT. 20-25 KT N 
WINDS ARE ALSO OVER THE NW CARIBBEAN NW OF THE FRONT. A SURFACE 
TROUGH IS OVER THE SW CARIBBEAN FROM 15N76W TO 9N76W. SCATTERED 
MODERATE TO ISOLATED STRONG CONVECTION IS ALONG THE COAST OF N 
COLOMBIA FROM 8N-16N BETWEEN 73W-78W. PATCHES OF WIDELY 
SCATTERED MODERATE CONVECTION ARE S OF HISPANIOLA FROM 15N-19N 
BETWEEN 67W-73W. IN THE UPPER LEVELS...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 32N62W TO HAITI ALONG 
26N65W 20N72W. SCATTERED SHOWERS ARE WITHIN 15 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 29N47W. A COLD FRONT 
EXTENDS OVER THE E ATLANTIC FROM 32N20W TO 26N30W AND DISSIPATES 
TO 22N40W. SCATTERED MODERATE CONVECTION IS W OF THE FRONT FROM 
29N-32N BETWEEN 21W-25W. IN THE UPPER LEVELS...AN UPPER LEVEL 
TROUGH IS OVER THE E ATLANTIC N OF 25N W OF 70W. AN UPPER LEVEL 
RIDGE IS OVER THE CENTRAL ATLANTIC BETWEEN 40W-70W. AN UPPER 
LEVEL TROUGH IS OVER THE E ATLANTIC E OF 40W. A UPPER LEVEL HIGH 
IS CENTERED OVER THE TROPICAL ATLANTIC NEAR 8N53W. EXPECT...THE 
W ATLANTIC COLD FRONT TO EXTEND FROM 32N51W TO PUERTO RICO 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 
WITH CONVECTION N OF 27N.      

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

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FORMOSA