Bulletin d’avalanche

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Jan 28 – 29, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

As the temperature drops, the avalanche danger should follow.

It may still be possible to trigger deep weak layers in thin snowpack areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5

    Old wind slabs, if triggered, may step down to a weak layer deep in the snowpack.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–3

    A widespread crust with facets is buried 50 to 100 cm deep. It's expected that triggering may still be possible in thin areas or with a large load (cornice or avalanche).

Confidence

High

Avalanche Summary

A rider triggered a large (size 2.5) slab avalanche on a southeast alpine slope on Sunday. The slab ranged from 20 to 100 cm deep with wind loading variability. The slab may have released on the persistent weak layer described in the Snowpack Summary. See this MIN for more information.

Snowpack Summary

Recent warmth then cooling is expected to have created a crust on all aspects, except perhaps treeline and above on northerly slopes.

The surface has been heavily wind-affected in exposed areas. A crust exists below 1250 m, making for challenging travel conditions.

A weak layer of facets and a crust from early December is buried roughly 50 to 100 cm deep.

Weather Summary

Monday Night

Mostly cloudy. 30 to 60 km/h west ridgetop wind. Treeline temperature -4 °C.

Tuesday

Cloudy with up to 5 cm of snow. 20 to 40 km/h west ridgetop wind. Treeline temperature -4 °C.

Wednesday

A mix of sun and cloud with 5 to 10 cm of snow overnight and 2 cm during the day. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Thursday

A mix of sun and cloud with up to 5 cm of snow. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid thin areas like rocky outcrops where you're most likely to trigger avalanches on deep weak layers.
  • Avoid steep terrain that is rocky and thin.
  • Be mindful that deep instabilities are still present in the snowpack.

Régions couvertes