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NOVA

Deadliest Tornadoes

Aired: 04/11/2012
52:52
Expires: 12/15/2015
Rating: TV-PG

Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?

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Chapter 1

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Chapter 3

Chapter 4

Chapter 5

Chapter 6

Deadliest Tornadoes

Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?

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