Bulletin d’avalanche

Northwest Inland

Apr 4 – 5, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible

Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Thin new wind slabs could form in exposed lee terrain and cross-loaded features. Triggering may be possible in steep terrain.
  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–6

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: A series of frontal systems will move through the province over the next few days bringing cloud and light snow to the Northwest. Friday: Light snow – 5-10 cm. The freezing level is around 800-1000 m and winds are moderate from the south-southeast. Saturday: Light snow continues. The freezing level remains around 1000 m. Winds are moderate from the south. Sunday: A mix of sun and cloud with a chance of flurries. Temperatures are pretty steady with daytime freezing levels around 1000-1200 m.

Avalanche Summary

Solar induced avalanche activity tapered off over the past couple days as temperatures cooled slightly. Previous activity included loose wet sluffs up to size 2 on steep sun-exposed slopes. Cornices and glide cracks continue to fail with some regularity.

Snowpack Summary

Light new snow will bury a variety or old snow surfaces including a melt-freeze crust, moist snow, sugary facets, and wind affected snow. Pockets of wind slab could develop in exposed lee terrain over the next several days. 30 - 60 cm of snow overlies a crust, old wind slabs or surface hoar layer buried on March 9th. The distribution of the surface hoar is also highly variable and it does not exist in every drainage. I would still remain cautious and continue to dig and test before diving into my line. Deeper in the snowpack, basal facets may resurface as a concern with continued mild temperatures.Cornices have become well-developed and could easily become unstable during periods of warm weather or direct solar radiation.

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