Arctic air is now entrenched across western Montana. Very cold air invaded western Montana last night and today. Lows Wednesday night and Thursday morning will fall well below zero in Butte and Kalispell to around 0 in Missoula and Bozeman. Highs Thursday in the single digits around Kalispell, the 10s in Missoula and Butte to around 20 in Bozeman.
Another wave of Pacific moisture will move into southwest Montana. Snow showers and flurries will be possibly along and south of I-90, especially in the Bozeman area. A WINTER WEATHER ADVISORY is posted overnight for Gallatin, Beaverhead and Madison Counties. Patchy fog will also be possible in those areas.
After a very cold Friday and Saturday when we're expecting some sunshine, temperatures will begin to warm Sunday and next week. In fact, highs will warm to the 30s to around 40 by Tuesday and Wednesday.