ENVIRONMENT
04/04/2014 09:05 am ET Updated Apr 04, 2014

Tornado Technology Innovation Born From 1974 Tragedy

Thursday marked the 40th anniversary of one of the most destructive tornado outbreaks in U.S. history. The event, deemed a Super Outbreak, took place over two days and spawned nearly 150 tornadoes across 13 states and the Canadian province of Ontario.

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