The National Weather Service has issued a wind chill warning, beginning Saturday at 6 p.m. and continuing through Tuesday at noon. According to the National Weather Service, wind chill values will drop to 25 below zero and colder starting during the warning time, and drop to as low as 40 below zero overnights and early monrings Sunday, Monday, and Tuesday. These extremely dangerous conditions can cause frostbite or hypothermia in as little as 10 minutes. Air temperatures will likely stay below zero during the warning time as well.