Lawinenlagebericht

Kootenay Boundary

Mar 31 – Apr 1, 2012Avalanche Canada
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Lawinengefahr

Mon
Tue
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
3 · Erheblich
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Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–6
    The increased wind and new snow have formed windslabs in lee zones at ridgecrest. These overlie a slick melt freeze crust in most locations and surface hoar on North aspects. A small windslab event could step down to the deep, persistent weakness.

  • Cornices

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–7
    Cornices continue to grow. There is potential for triggering deep persistent slabs on underlying slopes.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    2–4
    Up to 70cm of new snow has fallen recently. At lower elevations, expect moist sluffing, while higher up (drier snow) the storm slab is more cohesive. A small storm slab event (or sluff) could step down to the deep weaknesses.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Sunday: Expect more unsettled skies and lingering flurries, with westerly winds and freezing levels reaching 1500m. 15cm is possible. Monday: Expect the day to begin fairly clear, with a chance of sun poking out in the morning. Clouds should build in the afternoon, with a chance of flurries late in the day. Light southwesterly winds and freezing levels climbing to 1500m. Tuesday: Expect clouds and precip to build, with locally heavy accumulations. Winds continue light to moderate southwesterly with freezing levels around 1500m.

Avalanche Summary

The region has been very active with avalanches the past couple of days. Natural, explosive and human triggered avalanches have been reported up to size 2.5 failing in the storm snow or on the March 26 interface. Reports come from all aspects, with a bias to north facing slopes. At lower elevations (where the surface is moist) these are running as loose events and at higher elevations the new snow is propagating as a slab. Remote triggering has also been observed. There was one sympathetic triggered avalanche that released on the early February weakness 150cm deep. Also, several large avalanches (up to size 4.0) were explosive controlled recently. These failed from northeast to northwest aspects at ridgecrest and ran full path to valley bottom, ending as deep moist deposits.

Snowpack Summary

Up to 70cm of new snow has fallen since March 26. Shears within the upper storm snow are tightening with the persistent warm temperatures, although a reactive graupel layer down 25-40 is remains. The March 26 interface is a melt freeze a crust on all aspects except true north treeline and alpine, where small surface hoar (5mm) is present in sheltered places. The bond at this interface is gaining strength, with lingering concerns on true south aspects where the crust is thickest and where the surface hoar lurks. At lower elevations, the consistent high freezing levels have kept the new snow heavy and moist. The deep, persistent early February surface hoar lingers in the snowpack giving sudden results in testing. Concern remains with heavy triggers (cornice), step down avalanches and rapid loading from intense precipitation, strong winds or sun.

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