000
AXNT20 KNHC 301127
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
705 AM EST SUN DEC 30 2012

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...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL 
ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1115 UTC.

...ITCZ/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS FROM THE AFRICAN COAST NEAR 8N13W TO 
7N16W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM 
7N16W TO 5N20W TO 4N30W TO 3N40W TO THE EQUATOR NEAR 50W. WIDELY 
SCATTERED MODERATE CONVECTION IS FROM 1N-6N BETWEEN 20W-45W. 

...DISCUSSION...

GULF OF MEXICO...
AS OF 0900 UTC...A COLD FRONT HAS RECENTLY MOVED OUT OF THE GULF 
OF MEXICO. 20-25 KT NW WINDS ARE THE GULF. BROKEN TO OVERCAST 
LOW CLOUDS ARE OVER THE SW GULF S OF 25N W OF 90W. IN THE UPPER 
LEVELS...AN UPPER LEVEL HIGH CENTERED OVER THE CARIBBEAN SEA IS 
PRODUCING SW UPPER LEVEL FLOW OVER THE GULF. UPPER LEVEL 
MOISTURE AND BROKEN HIGH CLOUDS ARE OVER THE N GULF N OF 25N. 
STRONG SUBSIDENCE IS OVER THE S GULF S OF 25N. EXPECT IN 24 
HOURS FOR SURFACE WINDS TO VEER FROM THE EAST ENDING ALL COLD 
AIR ADVECTION. ALSO EXPECT SCATTERED SHOWERS OVER THE SOUTHERN 
BAY OF CAMPECHE WITHIN THE NEXT 24 HOURS. 

CARIBBEAN SEA...
AS OF 0900 UTC...A COLD FRONT EXTENDS FROM W CUBA NEAR 23N80W TO 
THE N COAST OF THE YUCATAN PENINSULA AT 19N87W TO N GUATEMALA AT 
17N90W. THE FRONT IS VOID OF ANY PRECIPITATION. 10 KT N WINDS 
ARE N OF THE FRONT. 15-25 KT TRADEWINDS ARE OVER THE REMAINDER 
OF THE CARIBBEAN WITH STRONGEST WINDS S OF JAMAICA. SCATTERED 
SHOWERS ARE INLAND OVER MOST OF CENTRAL AMERICA. MORE SHOWERS 
ARE OVER THE E CARIBBEAN E OF 68W. IN THE UPPER LEVELS...AN 
UPPER LEVEL HIGH IS CENTERED OVER THE CAYMAN ISLANDS NEAR 
19N81W. STRONG SUBSIDENCE IS OVER MOST OF THE CARIBBEAN EXCEPT 
OVER THE SW CARIBBEAN S OF 12N. EXPECT IN 24 HOURS FOR THE COLD 
FRONT TO BE OVER THE W ATLANTIC.  

ATLANTIC OCEAN...
AS OF 0900 UTC...A COLD FRONT IS OVER THE W ATLANTIC FROM 32N67W 
TO W CUBA NEAR 23N80W. SCATTERED SHOWERS ARE WITHIN 30 NM OF THE 
FRONT N OF 28N. A 1024 MB HIGH IS OVER THE CENTRAL ATLANTIC NEAR 
28N50W PRODUCING FAIR WEATHER. A 1018 MB LOW IS ALSO CENTERED 
OVER THE CENTRAL ATLANTIC NEAR 23N44W. A SURFACE TROUGH EXTENDS 
N FROM THE LOW TO 32N39W. IN THE UPPER LEVELS...AN UPPER LEVEL 
LOW IS OVER THE CENTRAL ATLANTIC NEAR 23N35W ENHANCING SHOWERS  
OVER THE CENTRAL ATLANTIC FROM 20N-30N BETWEEN 32W-40W. EXPECT 
IN 24 HOURS FOR A COLD FRONT TO EXTEND FROM 32N53W TO E CUBA AT 
21N75W WITH SHOWERS. 

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

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FORMOSA