Bulletin d’avalanche

Kananaskis

Mar 1 – 2, 2017Alberta Parks
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Archivé · expiré 10 years ago

Danger d’avalanche

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

In theory we are using the ratings by the exact definition. In practice, we are treating it as a cautious moderate. Keep a close eye on the snow and your terrain choice despite the moderate rating.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3
    New wind slabs are on N-S aspect. At treeline, these tend to be more widespread but less dense. In the alpine, the wind has focused them to immediate lee. This problem also factors in buried windslabs that are down 10-20cm.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    The cold weather has helped to break down the surface slabs, however the buried hard slab and/or facet layer is still intact. Convex terrain at treeline seems to be the most troubling areas.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    Recent facetting has broken down the surface slabs below treeline. Above that, this problem is alive and well! It is a hard layer to trust.

Confidence

High -

Weather Forecast

The winds will continue overnight. Westerly ridge winds will be sustained at  50km/hr at ridgeline and tomorrow range from 40-60km/hr. The 2500m high temp will be -9. As for precip, only trace amounts are expected, but there may be higher localized amounts.

Avalanche Summary

One notable avalanche was seen pouring off an alpine face today. Undoubtedly the wind is to blame, whether it was a cornice collapse or loose dry is a mystery. It appeared to pull out the slope below the face. Sz2, Goat Range, East aspect and went into skiable terrain.

Snowpack Summary

The winds picked up last night and created new windslabs on north to south aspects. These start to show up at treeline and continue up to alpine elevations. In the high alpine the winds were/are strong enough to strip the snow completely. Lots of wind transport indicates that immediate lee terrain and cross loaded gullies will be primed. Treeline and below has felt the cold. Facetting has weakened existing slabs and has started to break down the various crusts from a week ago.

Régions couvertes