Bulletin d’avalanche

Banff Yoho Kootenay

Apr 7 – 8, 2014Parks Canada
Voir sur la carte
Archivé · expiré 12 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

The first major warm up of the spring season is occurring right now accompanied by strong winds.  This is a time to travel cautiously as we expect avalanche activity to increase and we may start to see failures on our deep persistent weak layers.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Several cornice failures have occurred in the region over the last couple days. These can act as large triggers and cause failures on the basal facets. Warm temperatures and strong winds will cause this hazard to increase over the next few days.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    Moist surface sluffing and small wet slabs are likely on all aspects and elevations as freezing levels climb on Tuesday.  Stick to mellow terrain as even a small wet slide can be very powerful.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    With warming temperatures we expect to see an increase in avalanche activity on our deep facet layers especially in thinner snowpack areas or in places where a cornice fall could act as a large trigger. Minimize exposure to large slopes.

Weather Forecast

Strong SW winds, 5-15cms of snow, and rising freezing levels up to 2500m are forecast for Tuesday. Wednesday should see freezing levels drop back down to valley bottom with continued strong winds, cloudy weather and snow flurries. Thursday is a mix of sun and cloud and daytime freezing levels up to 2100m.

Snowpack Summary

Moist snow to 2000m on all aspects and to ridge top on solar aspects. Thin wind slabs in open areas. Western areas such as Emerald and Field have a deep and stable snowpack. The Lake Louise, Hwy 93 N, & Sunshine areas have a weaker snowpack and we are still getting easy to moderate sudden collapse results on the basal depth hoar in some areas.

Avalanche Summary

Loose wet sluffs observed in steep terrain on all aspects below 2000m and on solar aspects to ridge tops. Natural cornice failures have occurred in the last 48hrs creating slab avalanches to size 2. Kananaskis had a skier accidental yesterday in a thin snowpack area failing on the basal facets. We expect avalanche activity to increase tomorrow.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Régions couvertes