The City of Boulder, along with Boulder County and the Boulder Office of Disaster Management, will open a temporary 24-hour Extreme Weather Shelter on Saturday.

The coldest temps in about a year are taking aim at Colorado as a major blast of Arctic air will plunge Denver below freezing, remaining there for several days as flash freezing becomes a concern. Here's a look at potentially dangerous wind chills expected in Colorado and the Denver metro area.

A frigid cold front will keep Colorado below freezing over the weekend. Several rounds of snow in the Denver metro area are possible.

An arctic front will sweep through Colorado Friday afternoon with dangerously cold air and accumulating snow lagging behind it.