Bulletin d’avalanche

Kananaskis

Apr 5 – 6, 2017Alberta Parks
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

A snowy week is forecast so expect windslabs to build as the snow arrives.  Rain/Sun are two things that can quickly deteriorate stability out there right now so keep an eye on these meteorological factors!

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Not much natural avalanche activity with these wind slabs yet, but human-triggering is more likely in convex and unsupported features. These slabs seem confined to the Alpine.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    If/when the sun comes out, stability can quickly decrease on solar aspects.  Rain at lower elevations may also trigger this problem.  Pay attention to the quality of freeze overnight.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    We know it sounds like a broken record, but this deep layer is still a threat in any avalanche terrain that has not yet had extensive previous avalanching. While there is a lower probability of triggering, the consequences are high.

Confidence

Moderate -

Weather Forecast

A snowy week is headed our way it looks like.  Over the next few days up to 40cm of snow is expected to fall with strong winds out of the SW in alpine areas.  Freezing levels on Thursday are forecast to be around 2300m then dropping throughout the week.  When the sun does come out it packs an intense punch and stability on solar aspects can deteriorate quickly.  If the forecast freezing levels do come true, we may even see some rain at lower elevations.  Watch the sun and freezing levels on your trips!

Avalanche Summary

No new natural avalanche activity was noted on Wednesday.

Snowpack Summary

A clear and cold night brought a good surface freeze to the snowpack overnight, but that changed quickly on steep solar aspects where snow was moist by late morning. Solar aspects have a variety of buried crusts, whereas polar aspects above 2100m have an average of 20cm of dry snow sitting on a variety of previous surfaces. Wind slabs are present everywhere in the Alpine except in sheltered features. Not much natural avalanche activity has occurred with these wind slabs, but many areas like ripe for human-triggering. As previously reported the mid-pack remains dense and strong, but the basal layers are very weak consisting of anywhere between 50 and 100cm of facets sitting on the ground. Forecasters still have low confidence for traveling in large Alpine terrain, unless there has been widespread previous avalanching.

Régions couvertes