This is one of America's signature tornado outbreaks, not simply for the number of violent, deadly twisters, but also for the innovations it spurred in severe weather warnings.

Keith Word was at the Goshen United Methodist Church on Palm Sunday in 1994 with his wife and children. He says when the EF-4 tornado hit the building he was knocked unconscious.

Indiana town hosts homecoming parade for 9-year-old boy critically injured by tornado Teigan McCammon, from Dugger, Indiana, suffered serious injuries when an EF-2 tornado hit Greene County in May.