000
AXNT20 KNHC 261130
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
705 AM EST SAT DEC 26 2009

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1115 UTC.

...THE ITCZ...
THE ITCZ AXIS IS CENTERED ALONG 9N13W 5N20W 4N30W 3N40W EQ50W. 
WIDELY SCATTERED MODERATE CONVECTION IS ALONG THE COAST OF THE 
IVORY COAST FROM 3N-6N BETWEEN 3W-4W. ISOLATED MODERATE 
CONVECTION IS ALONG THE COAST OF LIBERIA FROM 4N-6N BETWEEN 
7W-11W. SCATTERED SHOWERS ARE WITHIN 90 NM OF THE AXIS W OF 20W 
TO BRAZIL.  

...DISCUSSION...

THE GULF OF MEXICO...
A 1020 MB HIGH IS CENTERED ALONG THE COAST OF LOUISIANA NEAR 
30N93W PRODUCING 10-15 KT ANTICYCLONIC SURFACE WINDS OVER THE 
GULF OF MEXICO. A COLD FRONT EXTENDS FROM THE STRAITS OF FLORIDA 
TO W CUBA ALONG 25N80W 22N81W. RADAR IMAGERY SHOWS ISOLATED 
SHOWERS ARE OVER THE STRAITS OF FLORIDA FROM 23N-25N BETWEEN 
79W-81W MOVING E. IN THE UPPER LEVELS...RIDGING IS PRODUCING SW 
FLOW AND SIGNIFICANT UPPER LEVEL MOISTURE WITH BROKEN HIGH 
CLOUDS. A 110-130 KT JETSTREAM IS NOTED OVER THE N GULF ALONG 
30N FROM E TEXAS TO THE FLORIDA PANHANDLE. EXPECT IN 24 
HOURS...FOR A SURFACE TROUGH TO BE OVER THE W GULF ALONG 93W 
WITH CONVECTION. ALSO EXPECT THE PRESENT COLD FRONT TO MOVE E TO 
THE W ATLANTIC WITHIN THE NEXT FEW HOURS.  

THE CARIBBEAN SEA...
THE TAIL END OF A COLD FRONT IS OVER THE W CARIBBEAN FROM W CUBA 
TO HONDURAS ALONG 22N81W 16N85W. ISOLATED SHOWERS ARE OVER THE 
NW CARIBBEAN FROM 17N-22N BETWEEN 82W-87W. 10-15 KT N WINDS ARE 
W OF THE FRONT. MODERATE TRADEWINDS ARE NOTED OVER THE REMAINDER 
OF THE CARIBBEAN AND CENTRAL AMERICA. ELSEWHERE...SCATTERED 
SHOWERS ARE OVER HISPANIOLA FROM 16N-19N BETWEEN 70W-74W...AND 
OVER THE LEEWARD ISLANDS FROM 17N-19N BETWEEN 60W-63W. IN THE 
UPPER LEVELS...A RIDGE IS OVER THE WESTERN CARIBBEAN W OF 78W. 
AN UPPER LEVEL TROUGH IS OVER THE REMAINDER OF THE CARIBBEAN 
WITH TROUGH AXIS ALONG 70W. STRONG SUBSIDENCE IS OVER THE ENTIRE 
CARIBBEAN AND CENTRAL AMERICA SUPPRESSING DEEP CONVECTION.    
EXPECT OVER THE NEXT 24 HOURS FOR LINGERING SHOWERS OVER THE 
LEEWARD ISLANDS.

THE ATLANTIC OCEAN...
A COLD FRONT IS OVER THE W ATLANTIC FROM 32N77W TO 25N80W. 
SCATTERED MODERATE CONVECTION IS NOW N OF 28N BETWEEN 70W-76W 
MOVING E. ANOTHER COLD FRONT EXTENDS FROM THE CENTRAL ATLANTIC 
TO N OF THE LEEWARD ISLANDS ALONG 32N36W 28N38W 22N46W 19N63W.  
WIDELY SCATTERED MODERATE CONVECTION IS NOW N OF 28N BETWEEN 
30W-34W MOVING E. SCATTERED SHOWERS ARE WITHIN 90 NM OF THE 
FRONT BETWEEN 37W-63W. A 1018 MB HIGH IS CENTERED OVER THE 
TROPICAL E ATLANTIC NEAR 23N23W. IN THE UPPER LEVELS...A RIDGE 
IS OVER THE W ATLANTIC N OF 20N W OF 60W. AN UPPER LEVEL TROUGH 
IS FURTHER E OVER THE W ATLANTIC N OF 20N BETWEEN 40W-60W. A 
BROAD UPPER LEVEL RIDGE IS OVER THE E ATLANTIC N OF 20N BETWEEN 
10W-40W. IN THE TROPICS AN UPPER LEVEL HIGH IS CENTERED NEAR THE 
CAPE VERDE ISLANDS AT 15N27W. EXPECT OVER THE NEXT 24 HOURS FOR 
THE TWO COLD FRONTS TO MOVE E WITH SHOWERS AND CONVECTION. 

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

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FORMOSA