Bulletin d’avalanche

Northwest Inland

Mar 1 – 2, 2016Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

A recent deep slab avalanche near Kispiox is a good reminder that this is a low snow year and there are lingering weaknesses at the base of the snowpack.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Given the recent variable winds I suspect that you can find wind slabs on all aspects in the alpine and at treeline.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–5
    A layer of facets close to the ground remains a low probability high consequence concern. Large avalanches could be triggered from thin spots or by heavy loads such as a cornice release or smaller avalanche.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

WEDNESDAY: flurries, moderate southerly winds, 1000m freezing level. THURSDAY: flurries, light to moderate westerly winds, 800m freezing level 1000m. FRIDAY: flurries, moderate southerly winds, 1200m freezing level.

Avalanche Summary

A very large avalanche was triggered remotely by a skier on Monday north of the Kispiox. It released on basal facets in a steep unsupported wind loaded feature.

Snowpack Summary

Recent moderate winds have created fresh pockets of wind slab in both traditional and reverse loaded lee features in the alpine and at treeline. A couple of crusts buried in early and late February can be found in the upper meter of the snowpack. Below this a layer of surface hoar from early January can be found in isolated locations between 60 and 140cm down. We havent heard of any activity on this layer for a couple of weeks now and it is becoming less of a concern. The snowpack in shallower areas sits on a weak base layer of facetted snow. This has active layer recently, responsible for several large avalanches in unsupported alpine features over the last couple of weeks.

Régions couvertes