Where To Stream NOVA Season 39 Episode 17

In the wake of April 2011's tornado outbreak, learn how we can protect ourselves and our communities in the future. In 2011, the worst tornado season in decades left a trail of destruction across the U.S., killing more than 550 people. Why was there such an extreme outbreak? How do such outbreaks form? With modern warning systems, why did so many die? Is our weather getting more extreme - and if so, how bad will it get? In this NOVA special, we meet scientists striving to understand the forces...