This updated and revised volume in the Dangerous Weather series explores tornadoes. Organized and written in an easy-to-follow style, author Michael Allaby answers the most important questions students and non-specialists have about tornadoes and he provides a general overview of the current information that shapes the way tornadoes are understood and studied. Featured coverage includes a definition of tornado; discussion about what happens when warm and cold air collide and how wind changes with height; explanations of jet streams, squall lines, thunderstorms, supercells, vortices and angular momentum, dust devils, and waterspouts; answers to questions such as how does a tornado begin, what happens inside a tornado, how does a tornado travel, and how does a tornado die; and a look at when and where tornadoes happen, Tornado Alley, tornadoes in Europe, and tornadoes of the past.