Bulletin d’avalanche

Banff Yoho Kootenay

Jan 20 – 21, 2013Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Ski quality has gone downhill due to the winds and warm temperatures. Ice climbers avoid pockets of hard windslabs on steep features in the alpine. SH

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs to pencil stiffness are possible to trigger in steeper terrain.  These are becoming more stubborn to initiate as warm temperatures bond these to  the surfaces below.  Caution where these sit over facets in thin snowpack areas.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    The Jan 6 layer could be a failure plane in areas with enough load or on steeper steeper unsupported features.  Dig down and look for surface hoar or prominent facets. (best preserved in the Kootenay region).

Weather Forecast

Light to mod. NW winds Sunday (Front ranges may have E winds Sunday AM) . A trace of snow is possible over the front ranges, but overall dry conditions are in the forecast .  Alpine temps around -10C Sunday with freezing levels near valley bottom.

Snowpack Summary

10-20+ cm variable windslabs from strong W/NW winds over last 3 days. 25-35cm over Jan 6 interface of facets and/or surface hoar (preserved W of divide treeline and below). Helen Ridge profile at treeline found mod. compression results on a 15cm surface windslab, with no results below on a mainly facetted snowpack. Thin sun crust on steep S slopes.

Avalanche Summary

No new avalanches reported today.  Winward slopes have been scoured to the bare rocks in many areas East of the divide.

Confidence

on Sunday

Régions couvertes