It took just three seconds for John Simmons and his family to lose their home in one of at least 15 tornadoes that swept across South Carolina last weekend. On March 15, as winds downed trees and ripped the roof off the two-story home the family built and lived in for just two years, Simmons, his wife and two sons rushed downstairs to a bathroom for shelter. That’s when Simmons, the last to enter the room, heard a "big roaring noise.’’