Bulletin d’avalanche

Northwest Coastal

Dec 29 – 30, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Pockets of windslab were formed by recent SE winds on lee side of ridges.  Some older windslabs formed by the strong NE outflow winds may also be hard to observe as they could be buried by the new snow in sheltered areas.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Loose dry avalanches may still be easily triggered on steep terrain.

Confidence

Good

Weather Forecast

Saturday night and Sunday: An upper ridge remains over the coast bringing dryer conditions and light to moderate NW winds until a front reaches the coast in the evening Sunday. Monday: The weak front is expected to bring light precipitation and possibly moderate amounts in the Northern part of the region with moderate to strong winds from the S. Freezing levels are expected to rise to 400 m. and temperatures to warm up slightly with the arrival of the front. Tuesday: Temperatures around -4 C, no precipitation, light SE winds. 

Avalanche Summary

A few small storm slabs were triggered on lee aspects (NW) in the Bear pass area. Also, there has been report of multiple small loose natural avalanches in steep rocky terrain around Terrace.

Snowpack Summary

A few cm of snow fell since yesterday's 20-30 cm of recent storm snow. The storm snow which fell with light to moderate winds from the SE formed new windslabs on lee side of ridges in the alpine and at treeline. The mid-pack is generally well settled. Note that a layer of surface hoar buried in the upper meter of the pack has been observed in the Shames backcountry.  In sheltered areas and below treeline, 40 cm of low density snow overlies a stiffer base. Near the base of the snowpack, a crust/facet layer continues to give hard, sudden results to no results in snowpack tests. This weakness is unlikely to be triggered by a single person, but it remains possible with a very heavy load (e.g. cornice fall) or from a thin-spot trigger point.

Régions couvertes