Bulletin d’avalanche

Cariboos

Jan 27 – 28, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Sun
Mon
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–7
    Wind slabs continue to build behind ridges and terrain breaks. Areas that avalanched earlier this week may re-load as the storm continues. Cornices are looming above many slopes, which could act as a trigger for deep avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    Storm slabs continue to build above buried weak layers. Warming and snowfall this weekend will increase the storm slab problem.

Confidence

Fair - Timing of incoming weather is uncertain on Saturday

Weather Forecast

Saturday: Moderate to heavy precipitation. Freezing level rising through the day to around 1300m. Strong to gale south-westerly winds at ridge top. Sunday: Light to moderate snow continues. Freezing level staying near 1200m. Strong westerly winds.Monday: A break from heavy snow, although light snow is possible, especially on western slopes. Freezing level falling back to valley floor.

Avalanche Summary

On Thursday, a skier remotely triggered a size 1.5 slab on a convex feature. It failed on facets beneath the storm snow. On Wednesday, three size 3.5 natural avalanches ran full path. A few other natural avalanches, up to size 2, were observed in steep lee (wind-loaded) terrain. Whumphing was observed below treeline.

Snowpack Summary

Up to 1m of snow has fallen since Monday. Strong winds have created hard slabs, soft slabs and fragile cornices. Snowpack tests give easy to moderate results on several layers in the upper snowpack. Key concerns as further snow builds this weekend include a weak facet layer that was created during the brutal cold snap in mid-January and a buried crust which is found below treeline.

Régions couvertes