Bulletin d’avalanche

South Rockies

Mar 21 – 22, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Watch the temperature and solar warming this weekend, heat and/or direct sun could quickly initiate cornice fall and natural slab avalanche activity.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Cornices in the region are now very large and fragile. A cornice fall could be destructive by itself, and could trigger a large avalanche on the slope below.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Significant snowfall and steady southwest winds have created a punchy new storm slab at all elevations.  Storm slabs are likely most susceptible to human triggering on solar aspects and on wind loaded terrain features.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–6
    The deep weak layers that formed in early February may be more likely to trigger in the north of the region. Possible triggers at this point include a large cornice fall, a large force in a thin snowpack area or solar warming.

Confidence

Fair

Weather Forecast

Synopsis: A ridge builds into the interior this weekend making for a fairly unexciting weather weekend. Look for high cloud, moderate freezing levels and no significant precipitation.Saturday: Freezing Level: 500m - 900m; Precipitation: Nil; Treeline Wind: Light, S | Ridgetop Wind: Moderate, WSunday: Freezing Level: 900m - 1400m; Precipitation: Trace; Treeline Wind: Light, NW | Ridgetop Wind: Moderate, NWMonday: Freezing Level: 1500m; Precipitation: Nil; Treeline Wind: Calm | Ridgetop Wind: Light, W

Avalanche Summary

On Thursday explosive control work in the region produced avalanches to size 2. A very soft slab was reportedly very sensitive to human triggering on steeper south aspects below 1800m, running on the March 19 crust.On Wednesday a size 2 wind slab was accidentally triggered by a skier in the southeast corner of the region. The avalanche occurred on a northeast aspect at about 2600m.

Snowpack Summary

15 - 50 cm of new snow has fallen in the last 48 hours accompanied by strong southwest winds which has created fresh windslabs in lee terrain. Below the new snow is a well settled storm slab which overlies a hard rain crusts. This crust exists on all aspects below 2000m and on solar aspects in the high alpine. North of Sparwood and in the Crow's Nest Pass area the buried crust seems more specific to previously sun-exposed slopes. The deep facet/crust persistent weakness buried at the beginning of February (now down up to 150cm) seems unlikely to trigger in areas where the hard, supportive near-surface crust exists. No matter where you are in the region, this weakness should stay on your radar as any activity at this interface would be large and destructive. Possible triggers include a large cornice fall, a large input in a thin snowpack area or solar warming.Cornices have also become large and unstable.

Régions couvertes