• A cold mass of arctic air will bring temperatures that are 10 to 30 degrees below normal across the north-central U.S. through Tuesday. The coldest air will be from the northern Plains to the Great Lakes, where highs will be in the single digits and teens. The cold air will spread through the Midwest, Ohio Valley and to the East Coast by midweek.
• Today: Mostly sunny. Patchy blowing snow in the afternoon. Highs 5 to 10 above. Northwest winds 10 to 20 mph. Coldest wind chill readings 25 below to 35 below zero in the morning.
• Tonight: Mostly clear. Lows around 10 below. Northwest winds 10 to 15 mph

shifting to the southwest 5 to 15 mph after midnight. Wind chill readings 25 below to 35 below zero.
• Wednesday: Windy. Mostly sunny. Patchy blowing snow through the day. Highs 15 to 20. West winds 15 to 20 mph shifting to the northwest 20 to 30 mph in the afternoon. Coldest wind chill readings 25 below to 35 below zero in the morning.
• Wednesday Night: Mostly clear. Patchy blowing snow in the evening. Lows around 15 below. North winds 15 to 20 mph decreasing to 5 to 15 mph after midnight. Wind chill readings 25 below to 35 below zero.
• Thursday: Colder. Mostly sunny. Highs zero to 5 above. Northeast winds 5 to 10 mph shifting to the southeast in the afternoon. Coldest wind chill readings 25 below to 35 below zero in the morning.
• Thursday Night: Partly cloudy. Lows around 10 below.
• Friday: Mostly cloudy. Highs 5 to 10 above.
• Friday Night: Partly cloudy. Lows around 20 below.
• Saturday: Partly sunny with a 30 percent chance of light snow. Highs around 5 below.
• Saturday Night: Mostly cloudy with a 40 percent chance of light snow. Lows around 10 below.