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Winter won’t let go of western Montana for a few more days.

The National Weather Service expects a significant snowstorm to hit the mountains around Butte, Anaconda and Philipsburg starting Tuesday evening and persisting through early Thursday. The Seeley-Swan valleys and Marias Pass along Glacier National Park’s southern border have been included in the Winter Weather Watch through Thursday morning.

Elevations above 4,000 feet may see heavy, wet snow accumulations by Wednesday morning, making backcountry activity hazardous.

The Butte and Anaconda areas may see about 2 inches of wet snow on Wednesday morning. That could cause trouble for tree limbs with new leaves, young plants, power lines and building roofs. Between 9 to 12 inches of slushy snow may pile up on high-elevation roads in the area, especially Homestake and MacDonald passes and the Pintlar Scenic Highway.

A Winter Weather Advisory has been issued for the Lower Clark Fork regions above 4,000 feet, including Lookout Pass and Evaro Hill. The Missoula and Bitterroot valleys may have slushy snow on the ground for the Wednesday morning commute times.

By Thursday, the low pressure system should move to the southeast and return western Montana to more seasonable temperatures. However, showers will be a daily possibility along higher regions of the Continental Divide, with the wettest period coming between Saturday evening and Sunday morning.

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Natural Resources & Environment Reporter

Natural Resources Reporter for The Missoulian.