Bulletin d’avalanche

Kananaskis

Mar 17 – 18, 2015Alberta Parks
Voir sur la carte
Archivé · expiré 12 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

Recently formed slabs remain sensitive to human triggering at higher elevations. Also, be mindful of solar radiation and its destabilizing effect on the snowpack on solar aspects.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–4
    Storm snow totals are now near 40cm at treeline and soft slabs are present in the alpine and open areas at treeline. The interface beneath these slabs is giving moderate results in snowpack tests, indicating the human triggering is possible.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    The mid-March sun is intense and has been causing loose wet avalanches on solar aspects for the last couple of days. Carefully evaluate your exposure to these features and be aware of overhead terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–5
    The recent new load of snow could be enough to awaken the basal weak layers, particularly in shallow snowpack areas.

Confidence

Good

Weather Forecast

A mix of sun and cloud expected on Wednesday with temperatures near -2 celsius in the alpine. Winds will be out of the NW at 25 to 45km/h with freezing levels near 2000m. A new system will push in Thursday bringing strong winds, cloudy skies and light precipitation.

Avalanche Summary

Several solar triggered sluffs up to size 2.0 observed today in the alpine. A few slab avalanches up to size 2.0 were also observed in steep alpine terrain on all aspects. These slabs involved only the storm snow.

Snowpack Summary

The snowpack is highly variable depending on aspect and elevation. Storm snow from last weekend has settled out to 40cm at treeline. The interface beneath this storm snow continues to give moderate sudden planar results in snowpack tests on polar aspects. Some areas at upper treeline elevations have a thin buried slab above this interface that was formed early in the storm. Wind speeds decreased dramatically at the end of the storm leaving mainly low density snow above these thin slabs. More extensive slab formation occurred in the alpine and several recent avalanches can be associated to this issue. On solar aspects a completely different situation exists. The storm snow is settling rapidly and appears well bonded to the previous surface of sun crust, except at higher elevations in the alpine where the bond seems less solid. Snow was again turning moist on the surface today in steep terrain on all solar aspects. On all aspects below 2100m the recent snow sits on a very dense and strong rain crust about 1cm thick.

Régions couvertes