Extreme Tornado Outbreaks Have Become More Common,Says Study     Tornado Outbreaks  Become More Common       font style='font-size:12px;'> 2016/3/14

Now, a new study shows that the average number of tornadoes in these outbreaks has risen since 1954, and that the chance of extreme outbreaks—tornado factories like the one in 2011—has also increased.

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