Bulletin d’avalanche

Kananaskis

Mar 8, 2020Avalanche Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Tue
Wed
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré

Points saillants

The avalanche cycle continues. Avoid avalanche terrain and be mindful of overhead hazard as the potential exists for avalanches to run long distances. Good skiing in sheltered areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely - Almost Certain
    Taille
    1–2.5

    Wind slabs are everywhere in the Alpine and in lee and cross-loaded terrain at Treeline. Human triggering is very likely.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1.5–3

    Cornices are large and fragile. If triggered, a cornice failure may trigger a wind slab or a deep persistent slab on the slopes below.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3.5

    With the recent loading, this layer may become more active. Triggering is more likely is shallow snowpack areas.

Terrain and Travel

  • Avoid freshly wind loaded terrain features.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.
  • Avoid lee and cross-loaded terrain.
  • Make conservative terrain choices and avoid overhead hazard.
  • Extra caution is needed around cornices under the current conditions.
  • Be aware of the potential for large avalanches due to the presence of a deep persistent slab.

Snowpack Summary

25cm of new snow in the past 24 hours. This new snow sluffs easily with ski cutting in steep terrain below treeline. This weeks storm snow is settling slightly but now totals between 60 and 80cm at Treeline elevations. Alpine areas are dominated by widespread wind slabs, and Treeline zones have significant slab conditions in lee and cross-loaded terrain. These slabs have been failing naturally and are very sensitive to human triggering in steep, convex and/or unsupported terrain.

Confidence

High -

Weather Forecast

Another 10cm is possible through Saturday night before a slight clearing trend Sunday morning. Flurries will move back in on Sunday afternoon. Temperatures should reach about -11 in the Alpine with moderate SW winds. Monday should be mainly sunny.

Avalanche Summary

A natural avalanche cycle is ongoing, but very poor visibility is making it difficult to get a sense of the scale of the cycle. Ski cutting in terrain at lower elevations is producing size 1.0 sluffs that are starting to get enough mass to push a person into a terrain trap such as a tree well or a gully.

Régions couvertes