MISSOULA — Patchy fog will be possible for some valleys Monday morning, especially across northwest Montana. Other than that expect a dry day with highs in the upper 40's to middle 50's. Clouds will be increasing throughout the day in front of our next weather system.
A low pressure system will bring widespread rain and mountain snow to western Montana Monday night and Tuesday. By Tuesday afternoon a cold front will move from east to west across the Divide bringing gusty winds first to northwest Montana Tuesday afternoon then west-central and southwest Montana Tuesday night.
As the front moves through, valley rain showers will begin to change over to snow. Only minor snow impacts are expected for valley locations with snow amounts staying below 1". The heaviest snow will be found in the Glacier Region where a Winter Storm Watch is in place. Mountains, including Marias Pass could see 8-"to-12" while valleys pick up 1"-to-4". The Winter Storm Watch includes, Bad Rock Canyon, Essex, Highway 83 Bigfork to Swan Lake, Marias Pass and Polebridge.
Much drier air will follow the front and stick around through the rest of the week with high temperatures topping out in the upper 30's to middle 40's.