Violent windstorms generated by tornadoes and hurricanes are reproduced in a controlled setting. Also: Storm chaser Jeff Piotrowski recalls the devastating EF-5 tornado that tore through Joplin, Mo., in May 2011.
The destructive power of natural disasters is explored in this four-part series, which kicks off with a look at floods. Survivors recount their experiences of being carried away by raging waters. Also: A full-scale house is built for an experiment to see what happens when it's hit with a simulated tsunami.