Whitefish Range
Swan Range
Flathead Range and Glacier National Park
How to read the forecast
An active weather pattern will bring a mix of rain and snow to the mountains under a cooling trend into the first week of November. Watch for fresh storm instabilities to develop on high elevation, north facing slopes that are harboring old, weak snow leftover from earlier in the fall.
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New and windblown snow will form thickening soft slabs at high elevations over the next week. Use caution on or directly below slopes where storm slabs are developing on top of old, weak snow leftover from earlier in the fall. Quick handpits can help you identify a poor snowpack structure, and shooting cracks are a clear sign of instability. New snow accumulating on bare ground and brush is generally benign.
Active weather is returning to the Flathead Valley. Decent moisture paired with high freezing levels will bring dense snow to high elevations and rain elsewhere this weekend. A cooling trend and downturn in precipitation intensity will follow into next week. On most terrain, snowfall will be accumulating on bare ground, posing no avalanche threats. However, the snow coverage that has survived the October dry spell has metamorphosed to weak facets and crusts, which will be reactive under accumulating slabs. Our recent observations suggest these weak layers are patchy and isolated to high elevation, northerly aspects, particularly in the Flathead Range and Glacier National Park. If you are hiking, skiing, climbing, or hunting in this type of terrain, bring appropriate avalanche gear and pay attention to snow depths and snow structure. Remember that even a small slide can have bad consequences if you get dragged over rocks, as this hiker found out a few weeks ago in Colorado. The FAC will monitor conditions through the fall and post updates as conditions warrant.
Now is the time to get your gear dialed and brush up on your avalanche knowledge. The 2018 Northern Rockies Snow and Avalanche Workshop has a great lineup of presentations, vendor booths, raffles, and an all-around good time. The event is November 3rd, 2018....all the details are here.
We will be producing mountain weather forecasts during our regular season operations. You can find current weather information at www.noaa.gov
This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires at midnight on the posted day unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.