Bulletin d’avalanche

Kootenay Boundary

Jan 13, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Wind slabs may be reactive to rider triggering. The safest, best riding may be in lower elevation terrain sheltered from the wind.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Recently formed wind slabs may still be reactive to human triggering in immediate leeward terrain features Wind direction has changed recently and wind slabs may exist on all aspects.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

The dominating arctic ridge is slowly breaking down as we transition to a more zonal (westerly) flow. Cloudy with some sunny periods, westerly winds and slightly warmer alpine temperatures will persist through the weekend. A more significant change to come early next week. Friday/ Saturday/ Sunday: Mix of sun and cloud with mostly cloudy skies on Saturday. Ridetop winds will be light from the SW-W and alpine temperatures near -9.

Avalanche Summary

On Wednesday, numerous natural loose dry and wind slab avalanches up to size 2 were reported. Most of these failed on solar aspects, or wind slabs that were triggered by people. With the winds recently switching directions, wind slabs should be expected on a variety of aspects.

Snowpack Summary

Up to 20 cm of recent snow has buried a plethora of old snow surface. This interface consists of wind scoured surfaces and old wind slabs, widespread near surface faceting (sugary snow), surface hoar in sheltered locations, and/or a breakable sun crust on steep solar aspects. Recent moderate to strong winds from all directions has redistributed some of this new snow into reactive wind slabs on a variety of aspects. Below this exists a couple of old freezing rain crusts from late-December, depending on your location. The mid-December surface hoar/ facet layer typically sits down 40-70 cm. This layer is still reactive to some snowpack tests in some areas but is currently considered to be dormant or inactive. Below this layer, the snowpack is generally well settled and stable.

Régions couvertes