Bulletin d’avalanche

Waterton Lakes

Dec 10 – 13, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Increasing winds will continue to build slabs in the alpine and treeline. Approach wind affected terrain with care.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Increasing westerly winds will continue to build slabs in lee areas at treeline and in the alpine.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–3

    A combination of melt freeze crusts and facets from early season snowfalls is lurking at the bottom of the snowpack. These layers are unlikely to be triggered by people but smaller avalanches in the recent storm snow have been stepping down.

Weather Forecast

Tuesday: Cloudy with isolated flurries and an inversion with alpine highs of -2. Moderate to strong west winds.

Wednesday: Cloudy with isolated flurries with inversion breaking down and an alpine high of -7. Moderate west winds reaching strong to extreme overnight.

Thursday: Cloudy with flurries, alpine high of -5. and strong west winds.

Snowpack Summary

15-25cm storm snow coupled with moderate west winds has formed new slabs in the alpine. This overlies previous windslabs and a crust below 1800m. A melt freeze crust facet combo formed at the start of the season sits at the bottom of the snowpack. Though unlikely to be triggered by people, we have seen other avalanches stepping down to this layer.

Avalanche Summary

Saturday night's snowfall brought enough snow and wind to trigger a limited avalanche cycle in lee alpine terrain along the Akamina Parkway. In two cases these stepped down to early season weak layers on east aspects in the alpine. No new avalanches observed in the less snowy front ranges.

Confidence

Due to the number and quality of field observations

Régions couvertes