Lawinenlagebericht

Sea To Sky

Nov 24 – 25, 2012Avalanche Canada
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Lawinengefahr

Mon
Tue
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
    Possible
    Größe
    1–3
    Fresh wind slabs below ridgecrests, behind terrain features, and in cross-loaded gullies may remain sensitive to human triggers, particularly where they are sitting on a previously exposed or lightly buried crust from early November.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    2–5
    Large avalanches running on a crust near the base of the snowpack are possible, particularly on slopes with smooth ground cover. Remote triggering and step-down avalanches might be a concern with this weakness.

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: The weather pattern is changing as a ridge of high pressure builds in from the southwest resulting in drier conditions and slightly cooler temperatures for the next few days. Sunday: A mix of sun and cloud. The freezing level is around 800-1000m. Winds are generally light. Monday: A mix of sun and cloud. The freezing level is around 1000m. Tuesday: Most likely another dry day, but we should see a frontal system arrive Tuesday night or Wednesday morning.

Avalanche Summary

Avalanche control on Whistler Mountain on Saturday produced one Size 2 avalanche on a northeast aspect that appeared to release on the early November facet/crust weakness. The arrival of cooler and drier weather will reduce the likelihood of natural avalanches, but human triggered avalanches are still possible.

Snowpack Summary

New wind slabs have likely formed in exposed northwest to northeast aspects at treeline and in the alpine. The main snowpack feature worth noting is a rain crust buried in early November and now down around 80cm at treeline as as deep as 1.5m in alpine areas. A weak layer of facets on top of and within this crust is worth remaining suspicious about (sudden collapse fracture character with propagation potential with snowprofile/ snowpack tests). Widespread whumpfing and cracking on this layer has also been reported from the Whistler area. Because this weakness is so close to the ground in most areas, associated avalanche activity will likely be limited to slopes with smooth ground cover (e.g. scree slopes, rock slabs, summer firn, glaciers, etc.). The total snowpack depth at treeline is around a metre. Alpine areas are deeper but more variable. Most slopes below treeline are still below threshold depths for avalanches. For more information check out the telemarktips.com forum , the Mountain Conditions Report, and Wayne Flann's Avalanche Blog.

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