Bulletin d’avalanche

Banff Yoho Kootenay

Dec 13 – 14, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Watch locally for fresh wind slabs from recent winds, and don't forget there are weak facets and depth hoar at the bottom  of the snowpack that are hard to predict. Good snow quality reported in sheltered areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5

    Strong alpine winds in the last 24 hours have increased wind slab thickness and likely their reactivity in many open areas in the alpine and some treeline features. Watch locally for their development as it has not been windy everywhere.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3

    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

The current strong alpine winds will die right down for Friday with a slow cooling trend (lows -8 to -10) and light flurries.  The light winds and cooling trend will continue through the weekend and we will be back to -20C temperatures by Sunday. 

Snowpack Summary

Moderate to strong winds in the alpine have increased wind slab thickness. 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

Natural and explosive controlled avalanche activity has tapered form earlier this week which saw a mix of wind slabs and larger avalanches entraining the basal depth hoar and facets to size 3. Visibility was minimal on Thursday so there were no avalanche reports. 

Confidence

Régions couvertes