Bulletin d’avalanche

South Columbia

Jan 21 – 22, 2016Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
4 · Fort
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Points saillants

A warm and windy storm is driving danger up on Friday.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–5
    Numerous large persistent slabs have been triggered over the last few days. New storm loading will only accentuate this problem.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–3
    New snow, rising temps and strong southerly winds are expected to create a storm slab problem. At low elevations, rain on snow may lead to loose wet/ wet slab avalanche activity that could run surprisingly far.

Weather Forecast

Friday brings another 10-20 cm snow, moderate to strong SW winds and freezing levels around 1500 m. A few more cm are expected on Saturday, before a change to light winds, cool temperatures, cloudy skies and a few flurries by Sunday. For more details check out https://avalanche.ca/weather.

Confidence

Moderate - Freezing levels are uncertain

Avalanche Summary

Numerous size 1-2 slabs were triggered naturally and by skiers over the last few days. Many of these failed at and below treeline, on buried surface hoar, about 20-40 cm deep. Many of these were triggered remotely, highlighting the volatility of the persistent slab. An increasing number of wind slabs have also been failing at alpine/ treeline elevations, and also running on surface hoar. Forecast rain at low elevations on Friday may lead to wet loose/ wet slab activity, while higher up the mountain, continued storm slab and persistent slab activity is likely.

Snowpack Summary

New snow, rising temperatures and strong winds are likely to create storm slabs in many places and wind slabs on features lee to the south. This will also add load and stress to the already volatile persistent slab. This 30-60 cm persistent slab overlies a variety of surfaces including large surface hoar, sun crusts, and facets. The persistent slab is ripe for human and natural triggers and is especially touchy at and below treeline. The mid and lower snowpack are generally well settled and strong.

Régions couvertes