Overnight snow showers to start the weekend
Winter Weather Advisory in effect until 10 a.m. Saturday for Lookout, Lolo, Lost Trail, and Marias Passes. Accumulating snow of 3 to 6 inches will fall overnight and disrupt travel Saturday morning. High winds that are continuing on the east side of Marias Pass may produce whiteout conditions.
Crosswinds may also be an issue in Livingston Saturday morning. A Wind Advisory is in effect with possible 60 mph gusts over the next 36 hours.
Cloud cover will move overhead in the pre-dawn hours of Saturday as our next storm arrives. We will start with a wintry mix in the valleys but progress to rain as we warm up during the day. Breezy conditions in Butte and Bozeman mean that rain will mostly stay away from that part of the region on Saturday. Higher elevations west of the divide such as the Swan Valley may see light snow accumulations around an inch or two. Highs will reach the 40s with morning lows near freezing.
We will cool down to near freezing Saturday night which will open the door for snowfall and deteriorating road conditions Saturday night and through Sunday. Even though a wintry mix is possible Sunday, most of the activity will involve snow. Highs will only reach the mid to upper 30s in many areas with a few spots such as around Bozeman cresting into the 40s on Sunday. Between 1 and 3 inches of accumulation is possible region-wide on Sunday, but the scattered nature of these snow showers means conditions will change rapidly through the day.
Expect more scattered snow starting Monday and warming up to rain by mid to late week. Temperatures will hover around average to slightly below average in the 30s and 40s.