A large storm system will move through the northern Rockies through the weekend. It is currently over Washington and will swing through western Montana Saturday and into Canada on Sunday. It will bring clouds to the region with areas of rain. The best chance of rain through Friday will be from the Missoula area to around Butte and along the divide. All of western Montana will have a chance of rain Friday night and Saturday, with the rain diminishing on Sunday. Some places will see more than a half inch of rain, with the heaviest from the Clearwater mountains of Idaho through the Missoula and Bitterroot Valleys east to Butte and north to Glacier National Park. Snow fill be possible in the higher elevations of both Glacier and Yellowstone National Parks.
Skies may become temporarily clear to partly cloudy Thursday night in northwest Montana where lows will drop to the 30s. This includes the Kalispell area. Spotty frost will be possible. Elsewhere, with the clouds, lows will be in the 40s. Highs in the 60s Friday, with lower 70s in southwest Montana around Bozeman.
Highs will remain in the upper 50s and 60s this weekend with lows in the upper 30s and 40s. Sunshine will return early next week with highs warming back to the 70s.
A gradual warm-up begins Monday with highs returning to the 70s next week.
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