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In the spring of 2011, the worst tornado outbreak in decades left a trail of destruction across the U.S., killing hundreds. Why has there been such an extreme outbreak? How do such weather patterns form? With modern warning systems, why did so many die? Could our weather be getting more extreme? If so, why? NOVA looks at the science behind these devastating outbreaks, meeting those affected, and the scientists trying to predict tornadoes, and explores whether there could be any connection to global climate change.
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