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NOVA | Deadliest Tornadoes | PBS

See the full episode at http://video.pbs.org/video/2220853400Why was the 2011 tornado season in the U.S. so extreme, and, with advanced warning systems, why did so many die? Airs at 9PM/8c Wednesday, April 11, 2012 on PBSLearn more about tornadoes on NOVA's website: http://www.pbs.org/wgbh/nova/earth/deadliest-tornadoes.html
Length: 00:31

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