By NBC News
February 17, 2015

A rare band of snow and ice pummeling the South left more than a quarter of a million customers without power, canceled 3,000 flights, and triggered mayhem on the roads early Tuesday.

Some 20 million Americans were under winter storm warnings at 4:45 a.m. ET after the storm hit on Monday. Six governors from Mississippi to Virginia declared states of emergency and ice storm warnings were in effect for two million people in Tennessee and South Carolina.

And the region was far from out of the woods: Forecasters warned that another system arriving Thursday looked likely to bring more snow…

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