Miguel Salazar clears sidewalks of Sherman St. in Denver, Colorado, on Thursday, December 22nd, 2022. | Photo by Hyoung Chang / The Denver Post

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...

Continue Reading Here’s what’s driving the frigid storm that’s messing up holiday plans across the US