Pa. has had a lot of tornadoes this year. But scientists don’t know if there’s a climate change link

A large tree lays uprooted past the hole where it came from in a yard as people continue cleanup efforts, Thursday, March 24, 2011 in Hempfield, Pa. Severe storms went through the Westmoreland County area on Wednesday March 23, 2011, causing severe damage. The National Weather Service has confirmed that a tornado was responsible for destroying 30 homes and badly damaging about 60 more in western Pennsylvania. (Keith Srakocic)

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