Bulletin d’avalanche

South Columbia

Nov 21 – 22, 2015Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Given the very limited information on hand for this bulletin, I would tread cautiously this weekend and take the time to gather snowpack information as I go. As always, we would love for you to submit any observations from your day to the MIN

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Westerly wind will have redistributed the low density storm snow from earlier in the week, forming soft windslabs. I suspect that the snow in lee features will be quite reactive. Look for shooting cracks as a sign you are entering a wind loaded area.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–4
    A variety of buried persistent weak layers have been reported from across the region including surface hoar, crusts and facets. Although it is starting to look like winter at upper elevations we're still dealing with a young snowpack.

Confidence

Good - Due to the number and quality of field observations

Weather Forecast

High pressure will persist over the region through Sunday before an advancing cold front the North brings moderate snowfall Monday and Tuesday. Sunday: Mainly clear, freezing levels rising up to 1100m with a temperature inversion extending to 2000m, light precipitation starting late in the day. Monday: 5 to15 cm of snow, southwesterly wind, a high of -10C in the alpine. Tuesday: 5 to 10 cm of snow, northerly wind, a high of -15C in the alpine.

Avalanche Summary

I'm working with limited observations but there haven't been any reports of avalanche activity. However, the avalanche cycle that occurred during and immediately after the storm earlier in the week produced some large deep avalanches.

Snowpack Summary

Up to 50cm of low density snow fell in the storm earlier this week. Over the last couple of days moderate westerly winds are likely to have moved this around and formed pockets of wind slab on east and northeast aspects. Below this were dealing with a complex snowpack. A couple of layers of surface hoar were formed earlier in the month. Where they exist, they are likely to be found buried down 65 to 120 cm. Depending on where you dig, you might also find one or more crusts. It would be wise to test these layers before committing to a slope. Facets can be found at the bottom of the snowpack at higher elevations in the alpine, especially on northerly aspects. Remember that its still a young snowpack. Rocks and stumps may be lurking unseen just below the surface. Ride with care!

Régions couvertes