Frigid temperatures are expected to sting two-thirds of the continental US this week as a powerful storm system races eastward. The timing couldn’t be worse, hitting right before the holidays, when many Americans are planning to travel. Those journeys — and even just being outside in some of the hardest-hit regions — may become treacherous as brutal cold blankets the country.
“What better way to kick off the official start of astronomical winter than with numerous wi...