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EXPLAINER: Arctic blast sweeps US, causes bomb cyclone

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NEW YORK (AP) — An arctic blast has brought extreme cold, heavy snow and intense wind across much of the U.S. — just in time for the holidays.
By MADDIE BURAKOFF
— An arctic blast has brought extreme cold, heavy snow and intense wind across much of the U.S. — just in time for the holidays.
The weather system, dubbed a “bomb cyclone,” is disrupting travel and causing hazardous winter conditions. Where is this winter weather coming from, and what’s in store for the coming days?
WHAT’S HAPPENING?
A front of cold air is moving down from the Arctic, sending temperatures plunging.
Much of the U.S. will see below-average temperatures, said Bob Oravec, lead forecaster for the National Weather Service in College Park, Maryland.
Temperatures may drop by more than 20 degrees Fahrenheit (11 degrees Celsius) in just a few hours, the National Weather Service predicts.
Wind chill temperatures could drop to dangerous lows far below zero — enough to cause frostbite within minutes. In parts of the Plains, the wind chill could dip as low as minus 70 degrees Fahrenheit (minus 57 Celsius).
Those in the Plains, the Upper Midwest and the Great Lakes were cautioned to expect blizzard conditions as heavy winds whip up the snow, according to the National Weather Service.
WHO WILL BE AFFECTED?
Pretty much everyone east of the Rockies — around two-thirds of the country — will see extreme weather, said Ryan Maue, a private meteorologist in the Atlanta area.

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