Bulletin d’avalanche

Kananaskis

Dec 17 – 18, 2018Alberta Parks
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Archivé · expiré 8 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

Hazard levels could be higher than forecast if the snowfall arrives earlier than expected. Backcountry users should keep a close eye on local conditions.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5
    There is still concern for human-triggering of wind slabs with the failure plane down 30 to 50cm at Treeline and deeper in the Alpine.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3
    The basal layers are very weak, even by Rockies standards. Any avalanche triggered in the upper snowpack is likely to step down to the basal layers. Extra caution is required to manage this avalanche problem.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

Tuesday and Wednesday will remain primarily windy (up to 90km/h from the SW), with daytime high temperatures near -7. When it comes to snowfall amounts there is significant disagreement between the models, with the most "optimistic" calling for 25cm by Wednesday evening.

Avalanche Summary

Natural avalanche activity has tapered off, but recent slides up to size 2.5 have been observed in the Alpine and Treeline elevation bands. Keep in mind that human triggering is still likely.

Snowpack Summary

A few convective flurries through the day on Monday put a light dusting on the surface. Recent storm snow has settled to an average of 40cm at Treeline. Widespread wind slabs are present in Alpine and Treeline terrain in lee and cross-loaded features. There has been lots of cracking, whumpfing, and skier triggered avalanches on the Dec 10th surface hoar and facet interface down 40-50cm. In addition, recent natural avalanches have stepped down to the October crust with fracture depths over 1 metre in some cases.

Régions couvertes