Bulletin d’avalanche

Kananaskis

Feb 9 – 10, 2015Alberta Parks
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Archivé · expiré 12 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

Wind slabs and storm slabs at Treeline and above are sensitive to human triggering. Cautious route-finding advised. Keep an eye on freezing levels as warmer temperatures will lead to an increase in danger level.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Recently developed wind slabs in open areas at Treeline and in the Alpine are sensitive to triggering as indicated by ski cutting results today. These wind slabs could initiate a larger avalanche by steeping down to more deeply buried weaknesses.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–4
    Recent storm snow up to 60cm deep is not bonding well at the Jan 31st interface at Treeline and above. This interface is highly variable across the forecast region. Whumpfing is common indicating that remote triggering is possible.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    3–6
    Large loads, such as cornices, could trigger full depth avalanches. Several very large avalanches have occurred in recent days that involved the entire winter's snowpack.

Confidence

Fair - Freezing levels are uncertain

Weather Forecast

A mix of sun and cloud expected on Tuesday with freezing levels near 1900m. Very light flurries are possible with light to moderate westerly winds. Alpine temperatures should reach -3 celsius. Slightly snowier conditions expected Wednesday before a warming trend on Thursday and Friday pushes the freezing levels up to 2200m.

Avalanche Summary

No new natural avalanches observed today, but visibility was quite limited. Ski cutting produces small slabs in steep terrain at Treeline.

Snowpack Summary

2cm of new snow through the day with very little wind. Temperatures at treeline rose to above freezing by early afternoon. The snowpack is settling rapidly and the surface snow is moist below 2000m on all aspects but this condition reaches higher on solar aspects. Recent storm snow of up to 60cm is bonding well below treeline, but not as well at treeline and above where moderate shears persist at the January 31st interface. Also at treeline and above new wind slabs have formed in recent days which are reactive to ski cutting. Cornices have experienced significant growth in recent days and several large avalanches have been triggered by cornice failures.

Régions couvertes