Bulletin d’avalanche

Kootenay Boundary

Dec 10 – 11, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    The buried surface hoar layer from late November may become reactive from the additional load of new snow and wind transported snow.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    There is a soft slab on the surface that may stiffen with wind transport over night. These slabs may be triggered by light additional loads like a skier or rider.

Confidence

Fair - Intensity of incoming weather is uncertain on Tuesday

Weather Forecast

Overnight and Tuesday: A warm front is moving across the region tonight and a trailing cold front should move through the region in the morning. The North of the region should get 5-10 mm starting in the early morning. The South may be quite a bit drier (4-6 mm). Strong NW winds overnight should become moderate to strong Westerly during the storm. Alpine temperatures should be -9.0 and the freezing level may rise to 700 metres during the storm.Wednesday: There is a weak ridge between systems that should bring very light precipitation, light Northerly winds and temperatures down to -10.0 in the alpine.Thursday: The next frontal system is looking weak at this time. Expect light precipitation and SW winds. Check back tomorrow for an update.

Avalanche Summary

Some very soft slab avalanches up to size 1.5 were reported near Nelson from explosives control.

Snowpack Summary

There has been a lot of unconsolidated surface snow that has been producing heavy sluffing in steeper terrain. It sounds like the wind is starting to transport some of this light surface snow into wind slabs. If the wind has not affected the snow yet, it probably will by morning. There is still concern in this region for the late November surface hoar that is buried about 100-125 cms. New wind slabs and the recent storm snow may be enough of a load to make this weakness reactive to light additional loads. There was some discussion about a thin variable crust that formed around the 5th of December. We have not heard any concern about this lately, do you see it in your local area?

Régions couvertes