Tomorrow's Commute Might be Rough most snow will fall overnight, so morning roads may be slick. MTN Weather Center and last updated 2021-04-18 17:14:07-04 BILLINGS â Full Forecast: Headlines/Current Conditions (As of 3:00 pm Sunday) Big changes taking place right now as a cold front with rain, snow and wind moves down from Canada. In areas around Flathead Lake, there is a Wind Advisory from 3pm till Midnight. Could see 40 mph gusts and on the lake, waves between 2 to 4 feet. Also, there is a Lake Wind Advisory from now till 9pm tonight at Fort Peck Lake. Could see winds gusting 30 mph. Small crafts be advised. There might be some rough waters.