Lawinenlagebericht

Cariboos

Mar 1 – 2, 2012Avalanche Canada
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Archiviert · abgelaufen 15 years ago

Lawinengefahr

Sat
Sun
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–6
    Old and new wind slabs exist on a variety of slopes. Persistent weak layers are buried beneath these slabs, meaning they could step down and create very large avalanches. Large cornices also threaten many slopes.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–7
    Several weaknesses in the upper snowpack have become less likely to be triggered, but consequences remain high. In some locations, large, destructive avalanches could be triggered by a light load, even from a distance.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–3
    New storm slab weaknesses are likely to develop as snow falls with rising temperatures. Be alert for the development of these once it starts really snowing.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Friday: Light snowfall (2-5cm through the day), becoming more intense on Friday night. Freezing level near valley floor, rising at night. Saturday: Moderate snow, perhaps 20cm. Freezing level gradually rising to around 1000m. Strong westerly winds.Sunday: Freezing level continuing to rise, peaking at 2000m. Moderate precipitation. Strong westerly winds. A cold front arrives on Sunday night.

Avalanche Summary

Avalanche activity has slowed down over the last two days, with only sporadic reports of avalanches. On Thursday, a cornice fall triggered a size 2 slab on a north aspect, which failed on the Feb 16. weakness. On Wednesday, numerous size 2-3 avalanches ran naturally, or with a remote trigger, on a variety of slopes. Most failed on an upper snowpack persistent weak layer. Natural avalanche activity is likely to increase again with this weekend's incoming weather.

Snowpack Summary

Down-flowing winds have created localized new wind slabs. Recent storm snow has become generally less reactive above the Feb 16. surface hoar layer and the early Feb. interface, however these layers are still exhibiting sudden planar ("pops") results in snowpack tests. The early Feb. interface consists of surface hoar (observed into the alpine, but most commonly found at and below treeline) and/or a crust (found on solar aspects, and on all aspects below about 1600m). These weaknesses are tricky to manage, as they are still touchy in certain locations, but the distribution of them is variable, so it's hard to know exactly which slopes are concealing these layers. Large cornices loom in some areas. Shallow snowpack areas may still harbour basal facets. The current snow surface is developing spotty surface hoar, surface faceting and sun crusts, which may bond poorly with incoming snow this weekend.

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