* WHAT...Temperatures from 10 above to 10 below zero with very cold wind chills as low as 25 below expected.

* WHERE...Portions of east central, north central, and northeast Colorado, including the Denver metro area.

* WHEN...From midnight tonight to 9 AM MST Tuesday.

* IMPACTS...The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. The coldest conditions will be from late Sunday night through early Tuesday morning.