17. Tornado Outbreak (2007)

On 3 April 1974, the most violent outbreak of tornadoes in history struck. The well-named "Super Outbreak" produces 148 twisters over 13 American states and in Ontario, Canada destroying thousands of homes and over 5,000 people die. How did a single storm form the 1974 "Super Outbreak" tornadoes?

Release date: 2007-01-02