From Answers.com: "An F4 tornado struck the heavily populated southern sections of Wichita Falls in the late afternoon on Tuesday, April 10, 1979 (known locally as "Terrible Tuesday").[citation needed] The storm was part of an outbreak that produced 30 tornadoes around the region. Despite having nearly an hour's advance warning that severe weather was imminent, 45 people were killed (25 in vehicles) and 1,800 were injured because the storm arrived just in time for many people to be driving home from work.[citation needed] The tornado left 20,000 people homeless and caused $400 million in damage, a U.S. record not topped by an individual tornado until the F5 Moore-Oklahoma City tornado of May 3, 1999."


