 May 3, 1999. An F-5 tornado rips through Oklahoma with wind speeds of up to 318 MPH. Approximately 675 people were injured; 48 people died. Damage was estimated at $1.2 billion, with more than 8,000 buildings, 7,000 homes and 20,000 automobiles destroyed. Equal in force to a shock-front nuclear explosion, the May 3, 1999 tornado is the greatest tornado force ever measured. How do you track it? Where do you hide? And when is it safe to get out? Test your knowledge, strategy, and instincts in the face of the Oklahoma City mega tornado.