Bulletin d’avalanche

Northwest Coastal

Apr 1 – 2, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

A weak surface hoar layer is creating touchy conditions in some areas. If you have field observations to share, please consider using the Mountain Information Network. Click here for more info.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    A weak surface hoar layer has recently produced large remotely triggered avalanches, and is now buried by up to 75cm of snow. We're still getting a handle on the distribution of this layer. Until we do, I'd assume it's in most parts of the region.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Recently formed storm slabs should gradually gain strength over the next few days. That said, large avalanches are still possible in in higher elevation, wind-exposed terrain.

Confidence

Good

Weather Forecast

5-15cm of snow falling under moderate southeasterly winds is expected throughout the day Thursday with an additional 5-15 cm by Friday morning. Unsettled conditions are expected for Friday and Saturday with 5-10 cm possible each day. Daytime high freezing levels should hover around 1300 m for the forecast period.

Avalanche Summary

Reports from Tuesday include several explosive-controlled wind slab avalanches up to Size 2. In the northern part of the region numerous skier-triggered slabs up to Size 2, including wide propagations and remote triggers, have been associated with a surface hoar weak layer buried on March 25th.

Snowpack Summary

Another 10-20 cm brings recent settled storm snow totals up to 50 cm overlying a variety of old snow surfaces including surface hoar. There is some uncertainty regarding the distribution of this buried surface hoar layer, although touchy conditions are being reported in the north of the region. Strong winds have significantly redistributed the storm snow into deep wind slabs on northwest through northeast aspects.

Régions couvertes