Bulletin d’avalanche

South Rockies

Dec 18 – 19, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Shifting winds have set up wind slabs on a variety of aspects, particularly north through southeast. Cross-loading is also possible on open slopes generally oriented parallel to the wind, which contain features and gullies to catch wind-drifted snow.

Confidence

Good - -1

Weather Forecast

Monday: Dry and bright. Treeline temps around -8C. An inversion will push alpine temps to around -2C. Moderate northwesterly winds. Tuesday: Light snow – around 3cm with strong northwesterly winds. Alpine temps falling to -12C by the end of the day. Wednesday: Flurries. Light to moderate northerly winds. Alpine temps around -18C.

Avalanche Summary

Small point releases to size 1 were noted from an area east of Hwy 43 in steep terrain. Recent reports of riders triggering small wind slabs on NE aspects around 2100 m are now a few days old, but still valid, given the recent wind event.

Snowpack Summary

A significant wind event on Saturday redistributed snow, scouring west-facing slopes and depositing highly variable wind slabs on east-facing slopes. A buried layer of surface hoar lies approximately 20 cm below the snow surface. Reports indicate this layer was blown around before it was buried and can only be found in isolated, sheltered locations. A well settled mid pack bridges over the basal weaknesses at the ground. The crust/facet combo still exists at the ground. This layer was responsible for some large releases earlier on in the season. However, there hasn't been any activity on this layer since early December and confidence is growing that it is gaining strength.

Régions couvertes