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Avalanche Forecast

Archived

Nov 29th, 2022–Nov 30th, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead, Flathead, Lizard, Bull.

The snowpack is complex and untrustworthy, even in higher elevation, deeper snowpack areas. If you're an advanced user read the Snowpack and Avalanche sections. If you just want some advice, stick to small terrain with minimal consequences so you won't be hurt when you get surprised.

Confidence

Low

Avalanche Summary

On Sunday there was a natural avalanche cycle in the Lizard Range, mostly size 2 but up to size 3. Avalanches were running within the storm snow but the odd sympathetic release suggests facets or surface hoar at the bottom of the recent snow (see Snowpack Section). This type of problem may linger.

Snowpack Summary

Matt and Connie's video paints a better picture of the snowpack than I can with words. Check it out! And here's their MIN report with a graphed profile.

Upper snowpack: consists of the 45 to 60 cm of snow over the past week. At the bottom of this recent snow is a layer of surface hoar.

Lower Snowpack: sugary faceted snow with a rain crust just above the ground.

Snowpack depths at treeline are 45 to 75 cm, and in the alpine 65 to 125 cm.

Weather Summary

Tuesday NightLight southwesterly wind, increasing to moderate as sunrise approaches. Up to 5 cm of snow. Temps around -15 to -20 C.

WednesdayModerate southerly wind, Five to maybe 15 cm of snow, Temps in the minus teens.

Thursday

Southwest wind diminishing during the day and snow ending near sunrise. Temps steady in the minus teens. Mix of sun and clouds.

Friday

Dry, Mostly sunny. Continued cold temps. Light westerly winds.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.