Florida Tornado History

Florida's tornado climate splits cleanly into two very different regimes, and understanding the difference explains the whole paradox of high frequency but low intensity. The dominant regime is the summer sea-breeze season. From late May through September, the peninsula is a tornado factory of a peculiar kind. Sea breezes push inland from both the Atlantic and the Gulf coasts each afternoon; where they collide over the interior, they force air upward and fire off thunderstorms almost daily. Many of these storms produce brief, weak tornadoes, and waterspouts that form over the surrounding warm water frequently move onshore and are logged as tornadoes. This is why Florida's monthly tornado counts peak in June, July, August and September — the opposite of Tornado Alley's April–June peak. These summer tornadoes are numerous but rarely strong; the vast majority are rated EF0 or EF1, and they account for the bulk of the state's 3,730-tornado total while causing relatively few deaths. The second regime is the cool-season outbreak, and it is the one that kills. In winter and early spring, when a strong jet stream and a passing cold front or a departing El Niño pattern overlay the warm, humid Florida air, the state can produce fast-moving, long-tracked supercell tornadoes that behave like their Plains and Dixie Alley cousins. Because these outbreaks often strike overnight — when people are asleep and cannot see the storm coming — even an EF3 becomes catastrophic. Every one of Florida's deadliest tornado events falls into this category. The February 22–23, 1998 "Night of the Tornadoes" outbreak across Central Florida killed 42 people, the deadliest tornado event in state history, with the single worst tornado tearing through the Kissimmee and Osceola County area. The February 2, 2007 Groundhog Day outbreak killed 21 across Lake and Volusia counties, including a violent EF3 that hit Lady Lake and Lake Mary before dawn. The March 31, 1962 outbreak in Northeast Florida killed 17. Florida's two F4 tornadoes — the strongest the state has ever produced — came in April, at the seam between the two regimes: a 1958 F4 that caused no deaths, and the April 4, 1966 F4 that killed 11 and injured more than 500. The state has never recorded an F5, and given its tornado sources — sea breezes, waterspouts and tropical systems rather than classic dryline supercells — a true F5 in Florida is considered extremely unlikely. All figures here are drawn from the SPC database and run slightly below press tallies, which count some tornado segments separately.