000
AXNT20 KNHC 110555
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
105 AM EST THU DEC 10 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0515 UTC.

...THE ITCZ...

FROM CENTRAL LIBERIA TO 5N20W 2N30W 1N45W...INTO EXTREME 
NORTHEASTERN BRAZIL ALONG THE EQUATOR AT 50W. ISOLATED MODERATE
SHOWERS TO THE SOUTH OF 5N TO THE EAST OF 10W...AND TO THE SOUTH
OF 7N BETWEEN 20W AND 55W.

...DISCUSSION...

THE GULF OF MEXICO...
THE UPPER LEVEL WIND FLOW ACROSS THE AREA IS FROM THE SOUTHWEST.
THE CURRENT COLD FRONT PASSES THROUGH 27N80W ALONG THE SOUTHEASTERN
FLORIDA COAST...ACROSS FLORIDA JUST TO THE SOUTH OF LAKE 
OKEECHOBEE...INTO THE CENTRAL GULF OF MEXICO...CURVING TO 24N94W
AND TO A 1012 MB LOW PRESSURE CENTER THAT IS NEAR 22N94W. A SURFACE
TROUGH CONTINUES TO THE MEXICO COAST NEAR 19N92W. BROKEN TO OVERCAST 
MULTILAYERED CLOUDS AND POSSIBLE PRECIPITATION ARE TO THE NORTH AND 
NORTHWEST OF 25N81W 24N93W 18N93W. 

THE CARIBBEAN SEA...
A WEAK SURFACE TROUGH IS ALONG 71W/72W FROM SOUTH CENTRAL HISPANIOLA 
TO 23N. THIS TROUGH COVERS THE AREA FROM HISPANIOLA TO THE SOUTHERN 
BAHAMAS. CLOUDS AND POSSIBLE PRECIPITATION ARE TO THE EAST OF THE 
TROUGH FROM 20N TO 23N BETWEEN 68W AND 71W. SHOWERS ARE POSSIBLE
IN THE TRADEWIND CLOUDS THAT ARE ELSEWHERE TO THE EAST OF 70W...
AND FROM 15N TO 20N BETWEEN 70W AND 80W. 

THE ATLANTIC OCEAN...
A DEEP LAYER WESTERN ATLANTIC OCEAN TROUGH SUPPORTS THE CURRENT COLD 
FRONT THAT PASSES THROUGH 32N71W TO THE SOUTHEASTERN FLORIDA COAST 
NEAR 27N80W. ISOLATED MODERATE SHOWERS ARE ALONG THE NORTHERN CUBA
COAST BETWEEN 80W AND 81W...AND IN THE WESTERN ATLANTIC OCEAN FROM
29N TO 32N BETWEEN 66W AND 72W...AND TO THE NORTH AND NORTHEAST OF 
BERMUDA. AN EASTERN ATLANTIC OCEAN DEEP LAYER TROUGH PASSES THROUGH 
32N25W TO 30N26W TO 26N28W. THIS TROUGH SUPPORTS A COLD FRONT THAT 
PASSES THROUGH 32N22W TO 27N27W TO 24N33W. WIDELY SCATTERED MODERATE 
SHOWERS TO ISOLATED STRONG THUNDERSTORMS ARE WITHIN 30 NM ON EITHER 
SIDE OF 27N23W BEYOND 32N18W. BROAD UPPER LEVEL ANTICYCLONIC FLOW 
COVERS THE AREA BETWEEN THE TWO DEEP LAYER TROUGHS. UPPER LEVEL 
ANTICYCLONIC FLOW IS TO THE SOUTH OF 16N BETWEEN 10W AND 
NORTHEASTERN SOUTH AMERICA. A SEPARATE AREA OF UPPER LEVEL 
SOUTHWESTERLY WINDS ARE TO SOUTH OF 9N30W BEYOND 16N16W.
A 1025 MB HIGH PRESSURE CENTER IS NEAR 28N49W. SURFACE ANTICYCLONIC
FLOW COVERS THE AREA BETWEEN THE 32N22W 24N33W COLD FRONT AND THE 
32N71W 27N80W COLD FRONT FROM THE WESTERN ATLANTIC OCEAN TO THE 
SOUTHEASTERN FLORIDA COAST.
 
$$
MT