Bulletin d’avalanche

Kananaskis

Apr 18 – 19, 2014Alberta Parks
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
3 · Marqué
Sous la limite
4 · Fort
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Points saillants

A weak freeze is forecast overnight and clear skies are forecast for Saturday.  The snowpack will deteriorate quickly on Saturday, especially on Solar aspects so early starts and early finishes are key.  Pay close attention to temperature and aspect.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Along ridgelines , ridgecrests and in gullied terrain expect to encounter these problems

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3
    Steeper terrain at treeline on all aspects and up to ridgelines on solar aspects.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    3–6
    This deep instability can become a problem with increased amounts of sun and or rain.  Have in your mind the "what ifs" of a large avalanche.

Confidence

Fair

Weather Forecast

Mix of sun and cloud with isolated convective flurries throughout the day on Saturday.  Winds are expected to increase overnight and begin to push into the strong range out of the SW.  Freezing levels again forecast to be around 2100m.  The cloud cover will minimize any overnight freeze so watch for stability to deteriorate earlier in the day on Saturday,

Avalanche Summary

Lots of loose wet pinwheeling was observed as well as 2 recent size 2 slabs at ridgelines in steep rocky terrain.

Snowpack Summary

A few cms of new snow overnight adds to the previous 20cm snow that has fallen over the past week.  On any aspects but true north this new snow has been fast to settle but on polar aspects in Alpine areas, there is still a very wintery snowpack.  The freezing level on Friday was at 2100m and below this the snow was wet and moist to ground.  Winds have been suprisingly calm but there was evidence of a windslab being formed at immediate ridgelines in the Alpine.  The basal facets are waking up with the warm temperatures of late and we are starting to see some larger avalanche or at least the potential for larger avalanches to occur.

Régions couvertes