Avalanche forecast

Northwest Inland

Apr 1 – 2, 2012Avalanche Canada
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Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
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Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–4
    Forecast strong winds and new snow will form fresh wind slabs. Watch for triggering in gullies, behind ridge crests and over rolls in terrain.

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–5
    Large cornices exist in alpine terrain. A failure could be destructive by itself, and could also trigger an avalanche on the slope below. Use extra caution if the sun shines through.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Monday: light to moderate snowfall - strong southeast winds - freezing level at 1200m Tuesday: light to moderate snowfall - moderate southerly winds - freezing level at 700m Wednesday: light snowfall - strong southwest winds - freezing level at 850m

Avalanche Summary

Natural icefall initiated a small slab avalanche on Saturday. In the north of the region, sluffing was observed in steep terrain in the alpine and at treeline. No other avalanches were reported. We should see an increase in wind slab avalanche activity with forecast weather on Monday.

Snowpack Summary

Light amounts of recently fallen snow overlie previously formed wind slabs. In general, north aspects at higher elevations hold dryer, low density snow while melt/freeze conditions exist on solar aspects in the alpine and all aspects at treeline and below. Solar aspects are becoming moist and unstable under sunny skies. The mid-pack is generally well consolidated; however, the mid February persistent weak layer, comprised of spotty surface hoar, facets and crusts, is buried 80-120 cm below the surface. No recent activity has been reported on this interface. It most likely needs a large trigger on a specific spot. If an avalanche occurs on this weak interface it will be very large and destructive. Below this the snowpack is well settled and strong. Cornices in the area are reported to be very large. Cornice failure could trigger an avalanche on the slope below. On a side note, surface hoar growth has been noted in recent days and should be something to watch as new snow falls.

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