MIAMI — A tropical depression formed Friday morning in the hot waters of the Caribbean, a system that the National Hurricane Center expects to significantly strengthen and make landfall somewhere in Florida around Wednesday — potentially as a Category 3 hurricane. Exactly where is the big question and concern, with nearly the entire peninsula potentially at risk. The first cone of concern is pointed near Fort Myers, but forecasters caution that the initial track could change. The National Hurricane Center, in an 11 a.m. update, forecast that Tropical Depression No. 9 to strengthen into a tropi…