WINTER SSTORM WARNING for Beaverhead, Madison and Gallatin counties until 5:00 AM. Heavy snow is required for the Winter Storm Warning for Elevations above 6500 feet. Additional snow accumulations of between 4-12 inches and isolated amounts exceeding 20 inches. Snow is required for the Winter Weather Advisory for Elevations below 6500 feet. Additional snow accumulations of between 1 and 4 inches

For the Bitterroot and Missoula valleys, WINTER WEATHER AVISORY is in effect until Tuesday at 11:59 AM. Mixed precipitation expected. Snow accumulations up to 2 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After a short break, snow will return for the morning commute.

WINTER WEATHER AVISORY in force for Flathead/Mission Valleys until Tuesday at 11:01 AM. Mixed precipitation expected. Snow accumulations totaling 1 to 3 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After a short break, snow will return for the morning commute.

WINTER WEATHER AVISORY in force for the Potomac/Seeley Lake Region until Tuesday, 11:01 AM. Mixed precipitation expected. Snow accumulations totaling 2 to 4 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After a short break, snow will return for the morning commute.

WINTER WEATHER AVISORY for the Butte/Blackfoot Region, from 5PM this afternoon to 5PM MST Tuesday Snow is expected. Snowfall totals between 1 and 3 inches Anaconda may have higher amounts.

WINTER WEATHER AVISORY for the Kootenai/Cabinet Region, from 5PM this afternoon to 11AM MST Tuesday Mixed precipitation expected. Snow accumulations totaling 2 to 5 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After scattered showers over night, snow will return for the morning commute.

WINTER WEATHER AVISORY for the West Glacier Region, from 5PM this afternoon to 11AM MST Tuesday Mixed precipitation expected. Snow accumulations totaling 2 to 5 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After scattered showers over night, snow will return for the morning commute.

For the Lower Clark Fork Region, WINTER WEATHER AVISORY is in effect until Tuesday at 11:01 MST. Mixed precipitation expected. Snow accumulations totaling 2 to 5 inches, and ice accumulations with a light glaze. A wintry mix is expected to occur around sunset and the evening commute. After a short break, snow will return for the morning commute.

Today will be cloudy with some rain or snow. The daytime highs will reach the upper 30s and lower 40s. Evening commutes could be treacherous, particularly for parts of northwest Montana and mountain passes. Temperatures begin to drop after sunset, making it difficult for some areas. Tomorrow morning snow showers will be back, causing a slippery commute. Most people see less than 2 inches of additional snow.

Parts of southwest Montana are subject to heavy snow showers Tuesday night through Wednesday morning. Bozeman, for example, will receive between 1 and 4 inches of snow over this period. This means that commuters can enjoy slick roads. For the mountain areas surrounding West Yellowstone and Big Sky, snow accumulations of up to one foot are possible.

The temperatures will drop in the second half the week. The daytime highs will reach the 20s and 30s while the overnight lows will drop to the single digits or the 10s.