Bulletin d’avalanche

Banff Yoho Kootenay

Dec 14 – 15, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

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

Points saillants

Basal facets, crusts and depth hoar are everywhere. If you head into committing terrain, it will be a bit of a gamble whether you will trigger a slope as these layers are hard to predict. A classic rockies snowpack!

Problèmes avalancheux

  • Wind Slabs

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

    Variable wind slab development over the last couple of days mainly in the alpine but also in some wind exposed treeline features. These are losing sensitivity to human triggering but will need a few days to settle out completely.

  • Deep Persistent Slabs

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

    The recent snow sits over weak facet and crust layers. As time goes on the chance of triggering is becoming less likely, but there is lots of uncertainty as to where you could trigger an avalanche and what it will take to get it moving.

Weather Forecast

Lows of -10C in the valley Saturday AM and alpine temperatures around -15C. Mainly light NW winds and no significant snow is in the forecast for the next few days.

Snowpack Summary

Variable wind slabs from the past 2 days have formed mainly in the alpine. Beneath the recent 40-60 cm of storm snow, the snowpack structure is generally weak, consisting of facets and depth hoar. The Nov crust is present up to 2500m and ~30 cm up from ground. Snowpack depths at treeline range from 80-160 cm.

Avalanche Summary

There were no avalanches reported Friday which is a big change from earlier in the week when there were many reports of either windslabs or deep persistent slabs with avalanche control and natural activity.

Confidence

Due to the number and quality of field observations

Régions couvertes