Bulletin d’avalanche

Kananaskis

Apr 18 – 19, 2018Alberta Parks
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Archivé · expiré 8 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

Solar radiation is a concern even under cloudy skies. If the cloud layer is thin, it may even create a "greenhouse" effect and cause the snow to weaken faster than if it was clear.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1.5–3
    Keep a safe distance from overhead cornices. These avalanches will be deep and run far.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1.5–2.5
    30-40cm slab sitting on top of the April 13 melt/freeze crust. These storm slabs could also be triggered by solar radiation.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1.5–2.5
    Expect the solar radiation to have a rapid, negative effect on the snowpack and ski conditions.

Confidence

High -

Weather Forecast

Overnight low of -6 and cloudy skies. Tomorrow has a freezing level of 2400m and a high of -1C. Expect thin clouds and strong solar input. Winds will remain light. No snow.

Avalanche Summary

2 notable avalanches today:-A cornice triggered slab on an east aspect. Sz2.5, ran full path and had a crown up to 1.5m thick. Near Ranger Creek.-Another cornice triggered pocket on a north aspect, possibly a sz 2.5(seen from a distance) and a consistent crown of 1m. Near Commonwealth Pk. We had a report of an avalanche in this area yesterday, so it is possible that this one is older.

Snowpack Summary

A freeze overnight and cloudy skies kept the snowpack reasonably cool for most of the day. By mid afternoon, the solar radiation began and the snow softened up on any solar aspect. Only polar aspects above 2200m are holding dry snow. The April 13th melt/freeze crust is still concerning as the bond appears to variable depending on aspect and elevation. Areas with consistently cool temperatures will be slower to improve.

Régions couvertes