THIS AVALANCHE FORECAST EXPIRED ON December 13, 2020 @ 12:07 am
Avalanche Forecast published on December 12, 2020 @ 7:07 am
Issued by Cam Johnson - Flathead Avalanche Center

Enjoy mostly stable conditions in the Swan Range today. As always, travel one at a time in avalanche terrain and be sure to carry your beacon, shovel, and probe.

1. Low

?

Above 6500 ft.
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

?

5000-6500 ft.
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

?

3500-5000 ft.
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
    Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
  • 1. Low
  • 2. Moderate
  • 3. Considerable
  • 4. High
  • 5. Extreme
Avalanche Problem 1: Normal Caution
  • Type ?

Expect dust on crust conditions in the Swan Range today. Light snowfall will continue to trickle into the area throughout the day. If you do find more than a couple of inches of new snow, and your decision takes you into steep terrain, watch for and steer away from small sluffs that you may trigger. These should be harmless in size, but can be consequential if they push you over a cliff or into another terrain trap.

Forecast discussion

Throughout most of the region expect low hazard conditions. Mountain snowfall accumulations reflect what you see out your window in the valley with little to no additional snow forecast today. If you head into the Swan, Flathead, southern half of the Whitefish Range and Glacier Park, you will likely be riding on a few inches of snow above a crust. Enjoy mostly stable avalanche conditions here with the only concern being a small sluff that can be triggered in steep terrain.

Now, if you decide to get into the northern half of the Whitefish Range, you may find yourself with 8 or more inches of new snow under your feet or machine.  This new snow is sitting on a slick crust or possibly a persistent weak layer that was buried on the 9th. The major concern in this area is a firm wind slab over a persistent weak layer. These slabs can break in surprising ways and propagate long distances. Obvious signs of wind drifted snow should lead you into terrain that was protected from the wind. As mentioned above, mind your sluff if your decisions take you into larger terrain where a small avalanche can pick up steam and knock you off your feet.

Yesterday in the Lake McDonald area of Glacier National Park, Clancy found a large natural avalanche off the NE face of Stanton at about 7100’ (observation here). Above 6500’ he also found a weak snowpack with roughly 6 inches of new snow. Keep this observation in the back of your mind if your objective is to get into the alpine today. Look for recent avalanches and be in tune with what is going on below the surface. If you plunge your ski pole into the snow and it goes from firm to soft, tone back your decisions and choose something less consequential.

Weather and CURRENT CONDITIONS
weather summary

Expect a cool, calm day today. Temperatures will be in the high teens with light winds gusting to 15 mph at the highest ridgelines. Light snowfall is expected for the Swan Range with no accumulations expected in other areas of our forecast area.

Two-Day Mountain Weather Forecast Produced in partnership with the Missoula NWS
For 5000 ft. to 7000 ft.
Saturday Saturday Night Sunday
Cloud Cover: Partly Cloudy Mostly Cloudy Mostly Cloudy
Temperatures: 16 to 21 deg. F. 11 to 14 deg. F. 17 to 23 deg. F.
Wind Direction: West Southwest South
Wind Speed: 5 G 15 10 11
Snowfall: 0" in. 0" in. 0" in.
Snow Line: 500' 500' 500'
Disclaimer

This forecast applies only to backcountry areas outside established ski area boundaries. The forecast describes general avalanche conditions and local variations always occur. This forecast expires at midnight on the posted day unless otherwise noted. The information in this forecast is provided by the USDA Forest Service who is solely responsible for its content.