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Avalanche Forecast

Archived

Nov 30th, 2023–Dec 1st, 2023

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

Regions

Lizard-Flathead, Akamina, Flathead, Lizard.

Early season hazards will be tougher to manage with grey skies and flurries in the forecast. Don't let poor visibility lead you into problematic terrain.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported in the past few days. Little change is expected until it snows again.

Observations are limited this time of year. Please consider filling out a MIN report if you do head out in the backcountry! 🙏

Snowpack Summary

Surface conditions are a mix of heavily wind-affected surfaces, sun crust on steep south and west-facing slopes, and 10-15 cm of faceting storm snow in shaded, sheltered areas. Surface hoar has been spotted growing on most of these.

A crust with facets below exists at or near the ground. In some areas this basal layer may be composed of melt forms or moist faceted snow.

At treeline, snowpack depths are between 40 and 60 cm. Below treeline, this tapers off quickly.

Expect early season conditions.

Weather Summary

Thursday Night

Cloudy with isolated flurries, minimal accumulations. Southwest alpine wind 5 to 20 km/h, increasing.

Friday

Cloudy with isolated flurries continuing from overnight. Still minimal accumulations. Southwest alpine wind 15-20 km/h. Treeline temperature -8.

Saturday

Cloudy with flurries continuing from overnight bringing 5-10 total cm of new snow. Southwest alpine wind 25-30 km/h. Treeline temperature -6°C.

Sunday

Cloudy with flurries bringing about 5 cm of new snow. Southwest alpine wind 20-40 km/h, increasing. Treeline temperature -4°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid areas where the snow feels stiff and/or slabby.
  • Avalanche danger is often elevated in alpine gullies where snow has accumulated.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.