An enormous, brutal mass of arctic air is shoving south over most of the United States—threatening 32 million people for the rest of the week with snow, ice, wind and extraordinary drops in the temperature.
Some of the country's biggest cities are being hit: Ice threatens to knock out power in Dallas, Denver could get almost a foot of snow, and Chicago could plunge from the mid-50s on Wednesday to the low teens by Friday night.
"This cold air is going to overtake just about the entire country," said Carl Parker, a meteorologist for The Weather Channel.
In Duluth, Minn., more than 2 feet of snow fell Tuesday, and at least another foot is expected Wednesday. Many streets are already impassable, and police reported dozens of crashes on snowy roads. By Friday, the temperature there could be minus 22.