Lawinenlagebericht

Northwest Coastal

Nov 22 – 23, 2012Avalanche Canada
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Lawinengefahr

Sat
Sun
Hochgebirge
Keine Stufe
Waldgrenze
Keine Stufe
Unterhalb
Keine Stufe
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Kernpunkte

This bulletin is based on limited data. Local variations in conditions are likely to exist. Check out the forecaster's blog for further details on interpreting early season bulletins.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–4
    Recent northerly and easterly winds have deposited weak slabs on unusual aspects. Natural avalanche activity is expected in response to heavy wind-loading, and fresh wind slabs will likely be sensitive to human triggering.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–5
    Facet/crust combinations can propagate over large areas, are often prone to remote triggering and step down avalanches, and typical trigger points include thin rocky areas.

Confidence

Poor - Due to limited field observations for the entire period

Weather Forecast

Friday: Moderate to heavy snowfall starting Thursday afternoon is expected to bring 30-50cm of new snow, with the highest amounts concentrated in immediate coastal areas, before tapering off by the evening. Freezing levels around 600-800m and mountaintop winds are expected to be extreme southwesterlies during the height of the storm, but ease throughout the day. Saturday: Continued moderate snowfall with 15-25cm possible, again heaviest for immediate coastal areas. Freezing levels remaining in the 600-800m range and strong southwesterly mountaintop winds. Sunday: A mix of sun and clouds with isolated flurries and cooling as winds shift to northwesterlies.

Avalanche Summary

Explosives control last weekend produced a couple of 30cm deep size 1.5-2 storm slab avalanches. Natural avalanche activity followed by human-triggered activity generally occurs with every intense weather period, such as what's forecast for Thursday night and Friday.

Snowpack Summary

Total snowpack depth is probably at least a metre in most treeline areas and deeper but more variable in the alpine, while below treeline areas are probably still below threshold depths for avalanches. A recent profile at 1200m in the Shames area showed a predominately "right-side-up" 120cm deep snowpack with a thin layer of facets sitting on a crust 35cm off the ground. An Extended Column Test produced easy (10 taps)  results on this persistent weak layer , but the resistant fracture didn't propagate across the entire column. Check out the Skeena/Babine discussion forum for more information from the area.

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