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NOVA

Deadliest Tornadoes

Season 39 Episode 10 | 53m 45s

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?

Aired: 04/09/12 | Expires: 06/16/20
National Corporate funding for NOVA is provided by Carlisle Companies. Major funding for NOVA is provided by the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.
Extras
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Clip: S42 E7 | 2:01
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After centuries of pseudoscience, researchers examine the causes of racial health disparities.
Preview: S52 E9 | 0:30
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