According to NOAA's National Climatic Data Center, Hurricane Dennis "formed as a tropical storm on July 5th in the eastern Caribbean Sea. The storm strengthened to hurricane intensity on the 6th, prompting hurricane watches and warnings for Jamaica and southern Cuba. Rapidly intensifying further, Dennis tracked just to the north of Jamaica and grazed the southern coast of Cuba before making a landfall at category 4 strength in south-central Cuba on July 8th. Hurricane Dennis weakened as it crossed Cuba, but regained strength in the eastern Gulf of Mexico as it moved north-northwest towards the northeastern shores of the Gulf. 

"The storm reached category 4 strength again overnight on the 8th/9th and finally made a U.S. landfall near Pensacola, FL on July 10th as a category 3 storm. Windspeeds were approximately 120 mph at the time of landfall and led to over 400,000 power outages along the coast and inland in Mississippi, Alabama and Georgia."

For additional data and imagery, visit the National Aeronautics and Space Administration's (NASA) Hurricane Season 2005: Dennis feature.