WIND CHILL ADVISORY is in effect until noon Saturday for all areas east of the continental divide including Bozeman and Helena.
Paige said DOT officials are working with the National Weather Service, Wisconsin State Patrol and other state and local entities in preparation for what could be slick and risky roads. The valleys will be affected less, though it is possible for some snow to accumulate Friday afternoon and evening.
The latest trend with the snow is to move the highest amounts north. Most of the computer models develop the snow between 2-5 PM especially in northern areas.
In addition, an arctic cold front will arrive tonight.
Highs on Sunday may again remain below zero with risky wind chills during the day. The heaviest snow is estimated to fall between 6 p.m. Friday and midnight Saturday.
Forecasters say arctic air also will create unsafe conditions, with wind chills plummeting to as low as minus 30 degrees. At the forecast wind chills, frostbite can happen to exposed skin within 30 minutes. Ten to 15 mile per hour winds, with gusts of up to 25 mph, are expected. But there is a warm-up in the forecast: Highs on Monday may reach the 20s above zero, with highs near 30 possible on Tuesday.
Friday's low in Madison was 7 at 6:30 a.m., 9 degrees below the normal low and 25 degrees above the record low of 18 below for December 16, set in 1876.
Officially, 3.4 inches of snow was recorded at the Dane County Regional Airport on Friday, giving Madison a December and meteorological winter total of 17.2 inches, 10.2 inches above normal.