000
AXNT20 KNHC 201155
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
705 AM EST WED JAN 20 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1115 UTC.

...THE ITCZ...
FROM LIBERIA JUST TO THE SOUTH OF THE SIERRA LEONE/LIBERIA 
BORDER ALONG 11W TO 5N20W 3N30W TO 1N40W...CROSSING THE EQUATOR 
ALONG 43W...INTO NORTHEASTERN BRAZIL NEAR 2S48W. ISOLATED 
MODERATE SHOWERS ARE TO THE SOUTH OF 6N TO THE EAST OF 33W.

...DISCUSSION...

THE GULF OF MEXICO...
MIDDLE LEVEL TO UPPER LEVEL WESTERLY WIND FLOW COVERS THE AREA. 
SURFACE HIGH PRESSURE COVERS THE AREA AROUND A 1018 MB HIGH 
PRESSURE CENTER THAT IS NEAR 27N83W. A RIDGE EXTENDS FROM 
A 1018 MB ATLANTIC OCEAN HIGH PRESSURE CENTER THAT IS NEAR 28N75W
TO THE 27N83W HIGH CENTER TO 27N93W IN THE NORTHWESTERN WATERS.

THE CARIBBEAN SEA...
BROAD UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS THE 
NORTHWESTERN CORNER OF THE AREA...FROM THE GULF OF HONDURAS
ACROSS CUBA AND THE BAHAMAS INTO THE ATLANTIC OCEAN.
A MIDDLE LEVEL RIDGE EXTENDS FROM THE ATLANTIC OCEAN NEAR
31N40W TO 24N53W TO 20N60W...ACROSS THE NORTHEASTERN CARIBBEAN
SEA INTO THE NORTH CENTRAL WATERS. THE SOUTHERN END OF A COLD
FRONT REACHES THE SOUTHEASTERN END OF THE DOMINICAN REPUBLIC.
A SURFACE TROUGH CONTINUES FROM THE SOUTHWESTERN COAST OF THE 
DOMINICAN REPUBLIC TO 15N78W TO COASTAL PANAMA ALONG 79W.
A SURFACE TROUGH EXTENDS FROM 19N61W...ACROSS ANGUILLA AND 
ST.MARTIN TO 16N67W. SHOWERS ARE POSSIBLE TO THE NORTH/NORTHWEST 
OF THE TROUGH WITHIN 30 NM ON EITHER SIDE OF 20N63W...PUERTO 
RICO...TO 17N69W. A SURFACE TROUGH IS IN THE ATLANTIC OCEAN 
ALONG 58W/59W FROM 14N TO 18N...AT THE END OF A REMNANT CLOUD 
LINE. SHOWERS ARE POSSIBLE FROM 16N TO 20N BETWEEN 56W AND 62W. 
THIS PRECIPITATION MAY REACH THE CARIBBEAN SEA IF ANY OF THIS 
REMAINS INTACT IN THE FUTURE. GALE-FORCE WINDS ARE ALONG THE 
COAST OF COLOMBIA FROM 11N TO 15N BETWEEN 72W AND 77W...
INCLUDING SEA HEIGHTS FROM 8 FT TO 13 FT. THIS CONDITION IS 
FORECAST TO CONTINUE FOR THE NEXT 48 HOURS.

THE ATLANTIC OCEAN...
A MIDDLE LEVEL RIDGE EXTENDS FROM THE ATLANTIC OCEAN NEAR 31N40W 
TO 24N53W TO 20N60W...INTO THE NORTHEASTERN CARIBBEAN SEA. THE 
BROAD UPPER LEVEL ANTICYCLONIC FLOW COVERS THE ATLANTIC OCEAN TO 
THE NORTH OF 20N TO THE WEST OF 38W. THE SOUTHERNMOST POINT OF 
UPPER LEVEL CYCLONIC FLOW IS NEAR 32N33W. A DEEP LAYER TROUGH...
RELATED TO THE CYCLONIC FLOW THAT IS NEAR 32N33W...SUPPORTS
A COLD FRONT THAT PASSES THROUGH 32N44W CONTINUES TO 27N54W TO 
THE SOUTHEASTERN CORNER OF THE DOMINICAN REPUBLIC ALONG 70W.
A SECONDARY SURGE OF COLD AIR IS MARKED BY A DISSIPATING COLD 
FRONT THAT PASSES THROUGH 32N50W TO 29N60W TO 28N70W. BROAD 
UPPER LEVEL CYCLONIC FLOW COVERS THE AREA FROM 6N TO 18N
BETWEEN 30W AND 55W.

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

$$
MT