Bulletin d’avalanche

Banff Yoho Kootenay

Feb 19 – 20, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

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

While avalanche activity is tapering, give wide margin to steep, open and planar features.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Hard wind slabs exist in the alpine lees, however recent cold temps will likely induce a sluggish/slow behavior if triggered.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3.5
    A 100-125cm dense slab of January storm snow overlies three weak layers in the mid snowpack: Jan 16, Jan 6, and Dec 15. All are a mix of sun crust, surface hoar and facets depending on the aspect and elevation.

Weather Forecast

Cold temperatures will persist in the forecast region for another few days. Expect lows in the -20 range. Very light precip is expected over the next 3 days, 2-5cm, which is not enough to effect the danger ratings. Wind velocity will be reasonable, generally light to moderate from the N-NW.

Snowpack Summary

Windslabs are common in open areas in the alpine, however the cold temps are making them considerably less touchy. A deep slab overlies midpack weaknesses of surface hoar, crusts, and facets. The depth of these slabs varies from 75 cm to 150 cm. These layers have been producing very large avalanches over the past week.

Avalanche Summary

No new avalanches were reported or observed today. Natural activity has been tapering off, but potential still exists.

Confidence

Due to the number of field observations on Sunday

Régions couvertes