Arctic air will surge into Iowa tonight and persist across the area into early Tuesday, bringing bitterly cold wind chills to the area. There will be brief periods on Saturday afternoon and again Sunday afternoon where portions of the area may rise above wind chill advisory criteria, however the will be limited.
Additionally even colder air will move into the area for Sunday into Monday and portions if not all of the advisory area will likely be upgraded to a wind chill warning at some point. A wind chill warning has been issued from midnight tonight to 7 AM Tuesday. The dangerously cold wind chills will cause frostbite in as little as 10 minutes to exposed skin.
A Wind Chill Warning means the combination of very cold air and the wind will create dangerously low wind chill values. Frost bite can occur quickly and even hypothermia or death if precautions are not taken.