000
AGXX40 KNHC 151833
MIMATS

MARINE WEATHER DISCUSSION        
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
245 PM EDT WED SEP 15 2010

MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA 
AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

GULF OF MEXICO...
HIGH PRES LOCATED OVER THE SE U.S. EXTENDS A RIDGE OVER THE 
NORTHERN HALF OF THE GULF WATERS PRODUCING NE TO E WINDS OF 10 
TO 15 KT AND SEAS OF 3 T0 5 FT.  WINDS INCREASE FARTHER SOUTH 
OVER THE EASTERN HALF OF THE GULF DUE A TIGHT PRES GRADIENT 
BETWEEN THE HIGH AND TROPICAL STORM KARL WITH MADE LANDFALL THIS 
MORNING OVER THE SOUTHEASTERN YUCATAN PENINSULA OF MEXICO. THE 
SYSTEM WILL REMAIN INLAND TONIGHT WHILE WEAKENING TO A TROPICAL 
DEPRESSION. KARL IS FORECAST TO MOVE BACK OVER WATER INTO THE 
BAY OF CAMPECHE EARLY THU STRENGTHEN BACK TO A TROPICAL STORM. 
KARL IS EXPECTED TO STRENGTH FURTHER TO A HURRICANE AS IT 
APPROACHES THE MEXICAN COAST FRI. KARL WILL MOVE INLAND INTO 
SOUTHERN MEXICO LATE FRI NIGHT OR EARLY SAT. TROPICAL STORM 
FORCE WINDS ARE FORECAST OVER THE SW GULF ON THU. HURRICANE 
CONDITIONS ARE EXPECTED OVER THE SAME AREA FROM 20N TO 24N THU 
NIGHT THROUGH EARLY SAT. 

SW N ATLC...
WEAK RIDGE DOMINATES THE AREA WITH LIGHT TO MODERATE NE TO E 
WINDS. A BELT OF ELY WINDS IN THE 10 TO 15 KT RANGE WILL PERSIST 
S OF 25N WITH SEAS OF 4 TO 6 FT IN E SWELL E OF THE BAHAMAS. 
MARINE CONDITIONS WILL BEGIN TO DETERIORATE TONIGHT AHEAD OF 
MAJOR HURRICANE IGOR. WAVES GENERATING BY IGOR WILL BEGIN TO 
SPREAD ACROSS THE AREA BUILDING SEAS TO 8 TO 12 FT E OF 75W 
EARLY THU. THE OFFICIAL NHC FORECAST TRACK KEEPS IGOR VERY CLOSE 
TO 65W. THEREFORE...HURRICANE AND TROPICAL STORM FORCE 
CONDITIONS CAN BE EXPECTED N OF 23N E OF 70W FRI THROUGH SUN. 
LARGE SWELLS FROM IGOR WILL DOMINATE THE MAJORITY OF THE AREA.  

CARIBBEAN SEA AND TROPICAL N ATLC...
POWERFUL HURRICANE IGOR IS JUST ENTERING THE NE PORTION OF THE N 
TROPICAL. SO...A HURRICANE WARNING IS POSTED N OF 17N E OF 62W 
FOR THIS AFTERNOON THROUGH THU. AS THE HURRICANE MOVE N OF THE 
AREA THU NIGHT TROPICAL STORM FORCE WINDS WILL LINGER N OF 19N.  
LARGE SWELLS GENERATED BY IGOR WILL AFFECT THE LEEWARD 
ISLANDS...PUERTO RICO AND THE VIRGIN ISLANDS THE REST OF TODAY 
AND THURSDAY. THE SWELLS ARE EXPECTED TO REACH PORTIONS OF THE 
BAHAMAS TONIGHT AND THURSDAY AND CONTINUE THROUGH THE WEEKEND.  
SWELLS ASSOCIATED WITH IGOR WILL ALSO REACH THE EAST COAST OF 
THE UNITED STATES THURSDAY AND FRIDAY AND CONTINUE OVER THE 
WEEKEND. 

 
WARNINGS...

SW N ATLC...
.HURRICANE AND TROPICAL STORM CONDITIONS EXPECTED N OF 23N E OF 
70W FRI INTO SUN.

CARIBBEAN...
.TROPICAL STORM WARNING FROM 18N-20N W OF 85W.

TROPICAL N ATLC...
.HURRICANE WARNING N OF 17N E OF 62W THIS AFTERNOON THROUGH THU.
  
GULF OF MEXICO...
.NONE. 

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

$$
FORECASTER GR