Lawinenlagebericht

Northwest Coastal

Feb 21 – 22, 2012Avalanche Canada
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Archiviert · abgelaufen 15 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
3 · Erheblich
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Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–5
    Moderate to strong winds combined with new snowfall will create new and reactive wind slabs on lee terrain. Expect wind slab development to occur throughout the forecast period.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–5
    This new snow may create touchy storm slabs that sit on a variety of buried weak layers. The slab that sits on these layers is up to 40cm thick, and growing.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Moderate-heavy amounts of snowfall are expected Tuesday night into Wednesday morning. Accumulations 15-25cm tonight, 15-20cm on Wednesday. Ridgetop winds from the West near 75km/hr overnight, tapering off to 40km/hr from the NW on Wednesday. Thursday may bring some flurries, but mainly dry, cooler conditions with the associated ridge. Freezing levels will remain at valley bottom. Friday brings light snowfall, and changing moderate outflow winds from the East.

Avalanche Summary

One natural size 2.5-3 was reported from Mt. Rainy occurred in the evening with additional precipitation and warming. One size 1 skier triggered avalanche occurred on a SW aspect @ 1400m. Crown depth was 5-10cm, the width 20m, running 20m.This ran in the current storm snow. Reports of natural sluffing on steep terrain features. With forecast wind and snow, avalanche activity may increase.

Snowpack Summary

Generally, up to 35 cm of new snow sits over a strong melt freeze crust that exists below 1000m on all aspects, and over wind-pressed powder on shaded alpine features. Facets and surface hoar have been found sandwiched between the newer snow and the old surfaces at treeline and below. This surface hoar seems to be more predominant in inland areas. Where it exists, this layer has started to become reactive under the new load and slab development. I suspect this will continue as the forecast snow and wind continues. Check out our Forecaster's Blog for some insight on incremental loading. The mid and lower snowpack is generally well settled and strong.

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