Avalanche forecast

South Rockies

Dec 1, 2017Avalanche Canada
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Archived · expired 9 years ago

Avalanche danger

Sat
Sun
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
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Highlights

The snowpack remains highly variable with few reports from the region. Reactive wind slabs may exist at upper elevations, as well as several deeper weak layers buried in the snowpack. Use a conservative approach and terrain selection.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2
    Stiff wind slabs could be reactive to rider triggers at treeline and above on lee and cross-loaded slopes.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–3
    There are several crusts now buried within the snowpack. Be extra caution in thin snowpack areas where it may be possible to trigger a deeper layer and assume that a release near the surface may also have the potential to step-down to a deeper layer.

Confidence

Low - Due to the number and quality of field observations

Weather Forecast

Friday: Mainly cloudy with isolated flurries. Moderate to strong ridgetop winds from the West. Alpine temperatures near -10 and freezing levels near 1000 m. Saturday: Mostly cloudy with isolated flurries. Moderate ridgetop winds from the South West. Alpine temperatures near -8 and freezing levels 1100 m.Sunday: Cloudy with 3-7 cm of new snow. Light ridgetop winds from the North West. Local snow fall amounts may be enhanced in the southern part of the region. Check out the Mountain Weather Forecast.

Avalanche Summary

No recent avalanches have been reported from the region. On November 29th a slab avalanche was reported from Kananaskis Country from Mt. Lawson and was possibly triggered by cornice fall. Please post your observations to the Mountain Information Network

Snowpack Summary

There remains to be very little information regarding snowpack structure within the region. I suspect that the upper snowpack consists of 10-50 cm of recent storm snow above a series of crusts, the most recent being the November 26 crust which is likely to be found up to 2550m elevation and approximately 2-5 cm thick. Below this is a thin layer of low density snow then the November 23 crust which also suspected to exist near 2450 m elevation. A third crust from late October (October 31) can likely be found down approximately 40-60 cm. This October 31 "crust/facet combo" (sugary snow) has been identified as a failure layer in recent avalanche reports from the Kananaskis area to the north will likely remain a concern for northern regions of the South Rockies. Finally the early season early October rain crust lies near the base of the snowpack bringing the average snowpack depths at upper elevations 60-110 cm. Take into account that the snowpack is highly variable in regards to aspect and elevation.

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