Bulletin d’avalanche

Banff Yoho Kootenay

Dec 14 – 15, 2012Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Great skiing can be found in wind sheltered terrain, especially below between 1750-2500 metres. (LP)

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    The wind slabs from earlier this week seem to be isolated to ridge lee features and high, open alpine terrain. In the Yoho area soft slabs were only found at ridge-top. Likely there was more wind on the Wapta & along Hwy 93 North.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Large planar faces or steeper, convex features that have been recently wind-loaded should still be given a miss due to this lingering problem.

Weather Forecast

For the next few days leading into the weekend, expect seasonal temperatures (-8 to -13)  and the occasional snow flurry bringing light amounts of snow.  Moderate West to North West winds will add to the chill and may add to the alpine surface windslab issue.

Snowpack Summary

Variable surface wind slabs have been found in immediate lee ridge features, as well as open terrain above 2800m. In sheltered locations, very good skiing can be found from 2500m to as low as 1750m. Lower than that and things get a bit thin . A well-settled mid-pack sits atop the Nov 6 rain crust, which is starting to break down in some locations.

Avalanche Summary

A couple of cornice triggered size 1-1.5 slab avalanches, 20-40 cm thick, in the last 24 hours above the Bourgeau left ice climb (SE asp) near Sunshiine.  They ran quite far for their mass, but stopped about 150 m above the climb.  No other new avalanches reported today.

Confidence

Régions couvertes