• A large winter storm system will move across the western U.S. early this weekend bringing heavy rain and mountain snow, with floods and mudslides possible in southern California. The storm will push eastward this weekend bringing a dangerous wintry mix of precipitation to much of the central Plains to Ohio Valley late Saturday and Sunday, and eventually to the East Coast by Monday.
• Today: Colder. Cloudy with a 50 percent chance of light snow. Highs around 5 below. North winds 10 to 15 mph. Wind chill readings 20 below to 30 below zero.

• Tonight: Mostly cloudy in the evening then becoming partly cloudy. Lows around 20 below. Northwest winds 5 to 10 mph. Wind chill readings 25 below to 35 below zero.
• Sunday: Mostly sunny. Highs zero to 5 above. Northwest winds 5 to 10 mph. Coldest wind chill readings 30 below to 40 below zero in the morning.
• Sunday Night: Partly cloudy. Lows around 15 below. Temperature steady or slowly rising after midnight. Northwest winds up to 5 mph shifting to the southeast after midnight. Wind chill readings 15 below to 25 below zero.
• Monday: Mostly cloudy. Highs 5 to 10 above. Southeast winds 5 to 10 mph. Coldest wind chill readings 15 below to 25 below zero in the morning.
• Monday Night: Mostly cloudy with a 30 percent chance of light snow. Lows near zero.
• Tuesday And Tuesday Night: Mostly cloudy with a 20 percent chance of light snow. Highs around 15. Lows 5 to 10 above.
• Wednesday: Mostly cloudy with a 20 percent chance of light snow. Highs in the lower 20s.
• Wednesday Night And Thursday: Mostly cloudy. Lows around 15. Highs in the lower 30s.
• Thursday Night: Mostly cloudy with a 30 percent chance of light snow. Lows around 15.