Unlike earthquakes, their fury is precise. Unlike hurricanes, their reach is unlimited. Unlike fires, there is no way to combat them. Unlike floods, their terror is sudden. Twister is inspired by real-life adventurers who live and work in the Midwest's tornado alley. These professionals are often the best and sometimes the only warning that a 300-mile-an-hour wind is coming down from the sky. And to help save the lives of others, they must continually endanger their own. - Storm-chasers follow tornadoes in Oklahoma.