* WHAT...West winds 10 to 20 mph with gusts up to 55 mph expected. * WHERE...Missoula/Bitterroot Valleys. * WHEN...From midnight Wednesday Night to 6 PM MDT Thursday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles.

* WHAT...Heavy snow expected. There is a likelihood of extreme winter storm impacts. Total snow accumulations 1 to 4 inches in the lower elevations and 12 to 24 inches in the higher elevations. Winds gusting as high as 45 mph. * WHERE...Highway 200 Thompson Falls to Plains, Evaro Hill, I-90 Lookout Pass to Haugan, and Highway 200 Trout Creek to Heron. * WHEN...From 6 PM Wednesday to noon MDT Saturday. * IMPACTS...For MAJOR winter weather impacts, expect considerable disruptions to normal activities. Dangerous or impossible traveling conditions. Avoid travel in the impacted areas if possible. Widespread closures and disruptions to infrastructure may occur. For EXTREME winter storm impacts, expect substantial disruptions to normal activities. Extremely dangerous or impossible traveling conditions. Travel in the impacted areas is not advised. Extensive and widespread closures and disruptions to infrastructure may occur. Life saving actions may be needed. The hazardous conditions could impact the Thursday morning and evening commutes, especially over higher passes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snow intensity is expected to decrease during the day Thursday during the strongest winds then increase after sunset.