Tornadoes: The Science Behind Terrible Twisters (The Science Behind Natural Disasters)

About 1,000 tornadoes touch down in the United States every year. Severe weather scientists are studying these types of deadly storms to discover how more lives can be saved. TORNADOES: THE SCIENCE BEHIND TERRIBLE TWISTERS explains how tornadoes develop, describes the technology that help predict and track the storms, follows daring storm chasers and provides safety tips for surviving a terrible twister.