A winter storm warning for portions of central and south central Montana will be in effect from noon Saturday until Monday at 11 p.m., the National Weather Service said.
Heavy snowfall is expected and travel will be difficult. Total snow accumulation of 10 to 14 inches is possible, with localized higher amounts possible.
In Billings on Saturday, there's a slight chance of snow before 9 a.m., then a chance of rain and snow between 9 a.m. and noon, and snow after noon. The temperature will reach close to 37 by 11 a.m., thenl fall to around 18 during the remainder of the day. Look for west wind 11 to 16 mph, becoming north northeast in the afternoon. The chance of precipitation is 90 percent, with a total daytime snow accumulation of around an inch possible.
Saturday night, the chance of precipitation is 100 percent, with new snow accumulation of around 5 inches expected. The low will be around minus 1, with wind-chill values as low as minus 15 and northeast wind 7 to 14 mph.
Snow is likely, mainly before noon, on Sunday. Skies will be cloudy, with a high near 26 and wind-chill values as low as minus 10 and south southwest wind 6 to 11 mph. The chance of precipitation is 60 percent, with new snow accumulation of around 2 inches.
The low Sunday night will be about 14, with south wind around 9 mph becoming north after midnight. The chance of precipitation is 80 percent, with new snow accumulation of around 3 inches possible.