Bulletin d’avalanche

Banff Yoho Kootenay

Dec 12 – 13, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

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

Points saillants

There's still a lot of snow available for transport. An increase in wind values will like result in further avalanche activity.

Problèmes avalancheux

  • Wind Slabs

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

    Recent snow and wind have formed wind slab in many open areas at treeline and in the alpine. Human triggering of this slab remains possible or even likely in some terrain, though natural avalanche activity has slowed down.

  • 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. Numerous natural and explosive triggered avalanches up to size 3 have been observed on these weak lower layers in the past several days.

Avalanche Summary

Natural avalanche activity has tapered form earlier this week. Avalanche control continues to produce wind slab avalanches up to size 2.5. There's still a lot of snow available for transport, any increase in wind values will likely result in further avalanche activity.

Confidence

Weather Forecast

Flurries will continue till the end of the week amounting to10cm of snow by Friday.  I slight increase in wind values at alpine elevations is expected Thursday but will quickly dissipate by early Friday. Generale steady temperatures around -7 are forecasted till Friday.

Snowpack Summary

Moderate winds in the alpine are adding to the wind slabs problem. 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.

Régions couvertes