A severe arctic storm could threaten holiday travel across the U.S.

A man clears a driveway after a snow storm passed through northern Minnesota last week. Forecasters say another big storm is expected to hit the region this week.

Holden Law / Holden Law

Bitter cold, biting wind and heavy snow are expected across the U.S. this week, forecasters say, imposing treacherous travel conditions just days before Christmas.

The latest bulletin from the National Weather Service (NWS) names the cause as a “strong arctic high pressure system,” which swept down from Canada on Tuesday and appears poised to march towards the Southeast on Wednesday and Thursday, leaving a wake of life-threatening weather systems across 17 states.

The Cascades mountains in Washington state are likely to see the heaviest snowfall on Tuesday, but nearby lowlands in Idaho, Montana and Wyoming could see a foot of snow, according to the NWS. The region could see another blast of snow and ice on Thursday.