Bulletin d’avalanche

Banff Yoho Kootenay

Dec 16 – 17, 2012Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Good alpine ski quality reported on sheltered SE through NE aspects West of the divide today. Wind exposed areas have variable ski quality. Generally good ice climbing conditions until Monday. SH

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    A trip report from Surprise pass (N/NE aspect) found pencil hard, thin windslabs in wind exposed terrain. These have also been found near ridge top but have been stubborn to unreactive in field tests.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    We are seeing weakening of the Nov 6 crust in thinner areas due to facetting.  Although we haven't seen activity on this layer recently, it is still a prominent feature of the snow pack, and should be evaluated in bigger features.

Weather Forecast

Continued cool temperatures, light to moderate SW winds, and no new snow will not change the hazard for Sunday.  Monday expect moderate to strong winds switching from SW to NW in the alpine, and possibly 10cm of snow at upper elevations which may increase the overall hazard.

Snowpack Summary

Cold temps facetting the snowpack, especially in thinner areas. In thicker snowpack areas there is generally a well settled midpack with the Nov. 6 crust lying 20-30cm above the ground up to 2700m. This has been observed to be breaking down as time goes on, facetting in thinner snowpack areas. Thin windslabs from previous NW winds in exposed areas.

Avalanche Summary

No new avalanche activity observed in the past 24 hrs.

Confidence

on Sunday

Régions couvertes