Lawinenlagebericht

South Columbia

Feb 1 – 2, 2015Avalanche Canada
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Lawinengefahr

Tue
Wed
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Avalanche danger will rise as a soft slab forms above a widespread layer of surface hoar and a crust. Danger may be lower than forecast in areas that that receive less snow.

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–5
    A layer of surface hoar buried in the upper meter of the snowpack remains a concern, especially at treeline and above. A large trigger, like an avalanche in motion could trigger deeper persistent weaknesses.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–3
    A thin soft slab will form as the snow accumulates.  A layer of recently buried surface hoar above a crust could make for touchy avalanche conditions.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

A frontal system will bring another 10 to 15cm of new snowfall to the region overnight on Monday with 5 to 10cm expected for Tuesday. A ridge of high pressure building over the province Wednesday will bring dry conditions. Winds will belight to moderate from the west to southwest. Freezing levels will remain at valley bottom until at least Tuesday.

Avalanche Summary

There was a widespread avalanche cycle earlier in the week that produced numerous large to very large avalanches. Natural activity has now eased, but the present of persistent layers in snow pack suggest that it may be possible for humans to trigger an avalanche. Forecast snow above a crust and SH means a reactive soft slab is likely to form.

Snowpack Summary

Up to 25 cm of new snow overlies a variety of old surfaces. A crust formed last week at most elevations. In some places it was breakable in others it was supportive. A thin widespread layer of surface hoar lies above this crust. At the highest elevations the old surface was widely wind-affected. Deeper in the snowpack the mid-January surface hoar remains a concern. It can be found down between 40 and 100 cm. In some locations it has reportedly gained quite a bit of strength, but elsewhere it is still producing sudden (popping) failures in snowpack tests. This spatial variability means we'll have to keep an eye on it for a while yet. The mid-December surface hoar layer is now 80 to 140cm below the surface and has become unlikely to fail.

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