000
AXNT20 KNHC 100005
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
705 PM EST SAT JAN 09 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 2315 UTC.

...THE ITCZ...
THE ITCZ AXIS IS CENTERED ALONG 6N10W 4N20W 4N35W EQ50W. 
WIDELY SCATTERED MODERATE CONVECTION IS ALONG THE COAST OF 
LIBERIA FROM 4N-7N BETWEEN 6W-10W. SIMILAR CONVECTION IS FROM 
1N-4N BETWEEN 13W-17W. 

...DISCUSSION...

THE GULF OF MEXICO...
A 1036 MB HIGH IS CENTERED OVER S TEXAS NEAR 30N97W. SURFACE 
RIDGING IS PRODUCING 20-25 KT NORTHERLY WINDS OVER MOST OF THE 
GULF OF MEXICO WITH A LOT OF COLD ARE ADVECTION. GALE FORCE 
WINDS ARE OVER THE BAY OF CAMPECHE S OF 21N W OF 94W. OVERCAST 
COLD AIR STRATOCUMULUS CLOUDS COVERS THE ENTIRE GULF. PRESENT 
TEMPERATURES RANGE FROM THE LOW 50'S OVER THE FLORIDA KEYS TO 
THE MID 30'S OVER THE NORTH GULF STATES...AND ARE FALLING. IN 
THE UPPER LEVELS...THE BASE OF AN UPPER LEVEL TROUGH IS 
PRODUCING MOSTLY ZONAL FLOW. A 130-150 UPPER LEVEL JET IS OVER 
THE NE GULF AND NORTH FLORIDA. A PLUME OF UPPER LEVEL MOISTURE 
WITH SIGNIFICANT BROKEN TO OVERCAST HIGH CLOUDS ARE OVER THE S 
GULF FROM THE BAY OF CAMPECHE TO CENTRAL FLORIDA. LATEST RADAR 
IMAGERY SHOWS MAJOR OVERRIDING WITH RAIN AND DRIZZLE OVER THE SE 
GULF AND SOUTH FLORIDA S OF PALM BEACH. SATELLITE IMAGERY SHOWS 
SIMILAR CONDITIONS ARE OVER ALL OF THE SOUTHERN GULF S OF 
25N...W OF RADAR RANGE. EXPECT...FREEZING TEMPERATURES LATER 
TONIGHT TO EXTEND AS FAR SOUTH AS PALM BEACH FLORIDA.

THE CARIBBEAN SEA...
AS OF 2100 UTC...A COLD FRONT EXTENDS FROM CENTRAL CUBA TO 
CENTRAL HONDURAS ALONG 23N79W 20N84W 15N87W. OVERCAST 
MULTILAYERED CLOUDS WITH RAIN AND SHOWERS ARE OVER THE NW 
CARIBBEAN AND CENTRAL AMERICA N OF THE FRONT. FRESH TO STRONG 
TRADEWINDS ARE OVER THE CARIBBEAN E OF THE FRONT WITH STRONGEST 
WINDS ALONG THE COAST OF N COLOMBIA. A PATCH OF SHOWERS ARE OVER 
THE WINDWARD ISLANDS S OF GRENADA. A CARIBBEAN VOLCANIC ASHFALL 
ADVISORY WAS ISSUED WITHIN 10 NM EITHER SIDE OF LINE FROM 
SOUFRIERE HILLS VOLCANO IN MONTSERRAT FROM 16.4N 62.1W TO 17.0N 
65.5W. REDUCED VISIBILITIES FROM ASH CLOUD MAY IMPACT MARINE 
OPERATIONS. IN THE UPPER LEVELS...AN UPPER LEVEL HIGH IS 
CENTERED OVER NW VENEZUELA NEAR 10N70W. STRONG UPPER LEVEL 
SUBSIDENCE IS OVER THE ENTIRE CARIBBEAN. EXPECT THE COLD FRONT 
TO EXTEND FROM E CUBA TO COSTA RICA IN 24 HOURS WITH RAIN AND 
SHOWERS.   

THE ATLANTIC OCEAN...
A COLD FRONT IS OVER THE W ATLANTIC ALONG 32N60W TO CENTRAL CUBA 
ALONG 29N70W 23N79W. OVERCAST MULTILAYERED CLOUDS WITH RAIN AND 
SHOWERS ARE N OF THE FRONT. A 1023 MB HIGH IS OVER THE CENTRAL 
ATLANTIC NEAR 32N34W. A COLD FRONT IS OVER THE E ATLANTIC ALONG 
32N20W 27N30W. IN THE UPPER LEVELS AN UPPER LEVEL RIDGE IS OVER 
THE W ATLANTIC W OF 40W. AN UPPER LEVEL TROUGH IS OVER THE E 
ATLANTIC E OF 40W. 
 
FOR ADDITIONAL INFORMATION PLEASE VISIT 
HTTP://WWW.HURRICANES.GOV/MARINE.

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FORMOSA