Avalanche forecast

Northwest Coastal

Feb 5 – 6, 2012Avalanche Canada
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Avalanche danger

Tue
Wed
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Avalanche danger will peak during the heat of the day.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–6
    Hard wind slabs exist behind ridges and terrain breaks in some areas. Large cornices also exist, which could trigger an avalanche on the slope below if they fall.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    3–8
    A weak layer of buried facets has produced a few avalanches this week. Chances of triggering an avalanche on this layer have gone down, but could still occur with a large trigger like a cornice fall or airborne sled.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–5
    Warm temperatures and direct sun can trigger loose wet avalanches, particularly in steep south-facing terrain. This problem will spike during the heat of the day, so manage the timing of your exposure to sunny slopes.

Confidence

Good - -1

Weather Forecast

Monday-Wednesday: Dry weather. Freezing level dropping to valley floor at nights and rising to around 1000m during the day. An above freezing layer is forecast for Tuesday between 1500m and 2500m. This means alpine temperatures could be above 0C. Light winds.

Avalanche Summary

Numerous solar-triggered avalanches to size 2.5 were observed on Saturday on slopes facing the sun. A few isolated slabs to size 2 were also reported from steep wind-loaded features near ridge top.

Snowpack Summary

Temperatures have been unseasonably warm, leading to moist or wet weak surface snow conditions. Where a re-freeze has occurred, a breakable crust now exists. Recent storm snow appears to be gaining strength. A facet layer buried on Jan 20th still exhibits hard, sudden planar results in isolated snowpack tests. It's about 120-150cm deep in the snowpack. At high elevations, large cornices and some wind slabs are causing concern. Cornices will be weakest during the heat of the day and have the potential to act as a trigger for deep avalanches on the slope below.

Regions covered