HORSESHOE BEACH, Fla. (AP) — Tropical Storm Debby slammed Florida with torrential rain and high winds, contributing to at least four deaths as it turned menacingly toward the Eastern Seaboard’s low-lying regions and threatened to flood some of America’s most historic Southern cities. The storm made landfall on the Gulf Coast of Florida early Monday as a Category 1 hurricane. It is now a tropical storm, with top wind speeds around 50 mph. At least four people have died as the result of the storm and more than 300,000 customers are without power in Florida and Georgia. Local leaders in Savannah, Georgia, are preparing for high water in case Debby stalls out over the city. An official in Charleston, South Carolina, says Debby could be a “historic and potentially unprecedented event.”