Bulletin d’avalanche

Kananaskis

Jan 7 – 8, 2013Alberta Parks
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Recent snow and strong winds have changed the avalanche danger for the first time in weeks. It is time to adjust terrain choices. A significant storm is expected Tuesday night which will further elevate the Danger Level.

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Steep terrain on all aspects are producing loose dry avalanches up to size 2.0. Occasionally these slides are also triggering small slabs. This is of particular concern in terrain traps. Ice climbers and skiers should be aware of overhead terrain.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    25cm of recent storm snow with strong to extreme W and NW winds have created storm slabs at all elevations. Cracking was observed in the alpine today and these slabs will become increasingly sensitive to human triggering over the next couple of days.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–6
    Recent test results show the Nov rain crust to be generally unreactive, but this could change with the addition of new snow load over the next several days. Carefully evaluate shallow snowpack areas.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Between 40 and 50cm of new snow is possible on Tuesday night and Wednesday. Strong to extreme SW winds are expected to accompany the snowfall. Temperatures in the alpine will be near -14 on Tuesday.

Avalanche Summary

Widespread loose dry slides up to size 2.0, but averaging size 1.5 ,on all aspects and all elevations. Some minor slab propagations were observed to be triggered by sluffs on steep lee and cross loaded features.

Snowpack Summary

Up to 25cm of storm snow has fallen in the past 48hrs. Storm slabs are present in the alpine and treeline areas as well as open areas below treeline. Some cracking was observed today in the alpine. The surface hoar and surface facets are now buried and are a layer of concern, especially at treeline and below.

Régions couvertes