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Avalanche Forecast

Archived

Dec 29th, 2025–Dec 30th, 2025

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

Regions

Esplanade, Dogtooth, East Purcell, St. Mary.

Continue to assess wind slabs on steep, exposed terrain, particularly in shallower areas where buried crusts may create favorable sliding surfaces.

Confidence

Moderate

  • Confidence is due to a stable weather pattern with little change expected.
  • Uncertainty is due to the complexity of the snowpack’s structure.

Avalanche Summary

A few small (size 1 to 2) rider triggered avalanches where reported over the weekend. These were primarily around treeline elevations on southerly terrain, failing 10 to 40 cm deep.

Snowpack Summary

Variable winds have created wind-affected surfaces at upper elevations, overlying generally low-density recent storm snow.

The mid-snowpack contains a melt-freeze crust buried in mid-December that exists at treeline elevations and below.

A second crust, buried in November, sits near the base of the snowpack and is associated with faceted snow. This layer extends into alpine terrain and has been a lingering concern throughout the season, particularly in shallow alpine areas where the mid-December crust is absent. In these locations, the November crust may lack a supportive overlying layer and remain susceptible to triggering.

Weather Summary

Monday Night
Mostly clear skies. 20 km/h northwest ridgetop wind. Treeline temperature -8 °C.

Tuesday
Mostly sunny. 30 km/h west ridgetop wind. Treeline temperature -6 °C.

Wednesday
Mostly sunny. 30 km/h west ridgetop wind. Treeline temperature -3 °C.

Thursday
Mostly sunny. 20 km/h southwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Avoid lee and cross-loaded slopes at alpine and treeline elevations.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.

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.