Why this winter storm will likely be a wild one

Most of the US is bracing for a prolonged stretch of frigid weather and a massive winter storm that could wreak havoc on roads and power grids over the next several days.

At least 170 million Americans are under winter weather alerts. “Bitterly cold temperatures and dangerously cold wind chills” will linger even after the storm is done dumping heavy snow, sleet, and freezing rain across the Southern Rockies all the way to New England through Monday, the National Weather Service (NWS) warned Friday. Forecasters expect low temperatures to break numerous records, with wind chills as frigid as -50 degrees Fahrenheit in the Northern Plains.

It …

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