Bulletin d’avalanche

Kananaskis

Feb 20 – 21, 2019Alberta Parks
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Archivé · expiré 8 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Look for good skiing in sheltered areas. Recent avalanche activity is a good reminder that MODERATE hazard is not a "green light" to blindly jump into bigger terrain features.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Recent winds led to wind slab development in the Alpine and just into Treeline. Watch for unusual loading patterns due to northerly winds.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    This problem should settle out fairly quickly, but watch for sluffing in steep terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2.5
    The basal facets finally woke upon Tuesday. Some time around midday a full depth avalanche occurred at Treeline on Tent Ridge. This layer is still unlikely to trigger, but has severe consequences if it does fail.

Confidence

Moderate -

Weather Forecast

Thursday will be mainly cloudy with very light flurries. Overnight lows will drop to near -25, with daytime highs near -14. Winds will be light and variable. Similar conditions on Friday.

Avalanche Summary

No new avalanches observed today, but visibility was very limited. Recent strong winds resulted in several loose dry avalanches yesterday up to size 2.0, primarily in very steep Alpine terrain on all aspects. In addition, the deep persistent layer of basal facets finally woke up and a size 2.0 naturally triggered slab occurred on the north end of Tent Bowl around midday on Tuesday. This slide occurred at Treeline and was only about 40m wide, but was between 120 and 140cm deep and failed on the basal facets.

Snowpack Summary

A few cm's of snow fell through the day, but accumulations were minimal. New wind slabs can be found in Alpine and Treeline features on all aspects, but we are unsure of the extent of these due to a lack of field observations today. The mid pack has enough strength and depth (in most places) that triggering the bottom layers is unlikely. The key to avoiding trouble is avoiding thin areas where the bridging is minimal.

Régions couvertes