Climate change drives December weather records of tornadoes, snowfall

A December of violent storms and record snowfall put a final exclamation point on a wild weather year that was 2021 in the U.S. 

The month produced the year’s two biggest tornado outbreaks and the most tornadoes on record for December. And there were twice as many severe weather reports issued than in any December since the National Weather Service started keeping track 21 years ago.

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