According to this report:

Rare one-two punch
Bonnie and Charley are the second and third named storms of the 2004 Atlantic hurricane season. The first, Hurricane Alex, skirted the Outer Banks of North Carolina last week.

Rappaport said it is not uncommon to have several storms brewing in the Atlantic region but it is unusual to have two of them threatening the same state simultaneously.

"We don't have anything in our records -- and the hurricane center was established about 50 years ago -- to suggest that we've had a similar occurrence during that period.

"But if you go back further in the data, it looks like there may have been one other incident like this about 100 years ago. [In] 1906. Florida was hit by two storms in about a 24-hour period."

Sometimes, the worst damage comes from a storm's reminants as it moves inland. They frequently spawn massive rain, flooding, and tornados. A lot of people are going to be impacted by these storms, and not just in Florida.