Avalanche forecast

South Rockies

Dec 6, 2017Avalanche Canada
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Avalanche danger

Thu
Fri
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Change is in the air with strong solar effect and the beginning of a warming trend in the forecast. These two factors will begin to undermine stability on Wednesday.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    Stiff wind slabs could be reactive to rider triggers at treeline and in the alpine on leeward and cross-loaded slopes. Be especially cautious of cross-loaded slopes that see sun exposure on Wednesday.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    2–3
    There are several crusts now buried within the snowpack. Use extra caution in thin snowpack areas where it may be possible to trigger a deeper layer. Triggering a wind slab may also have the potential to step-down to a deeper layer.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

Wednesday: A mix of sun and cloud. Light northwest winds. Alpine temperatures around -3 and rising in the afternoon and evening with the onset of an alpine temperature inversion.Thursday: Mainly sunny with some valley cloud. Freezing level rising from 2700 to 3300 metres over the day with a strong temperature inversion. Alpine temperatures to about +5 with cooler temperatures at lower elevations.Friday: Sunny. Light west winds. Freezing level remaining around 3300 metres with alpine temperatures to about +7. Cooler at lower elevations under the lingering temperature inversion.

Avalanche Summary

No new avalanches have been reported from this region. There is potential for triggering wind slabs on leeward slopes and dry loose avalanches from steeper terrain features. Smaller avalanches may also step down and trigger larger avalanches on buried weak layers deeper in the snowpack. Please submit your observations to the Mountain Information Network.

Snowpack Summary

Average snowpack depths at upper elevations in the region range from 60-110 cm. Snow surfaces have been scoured on southwesterly slopes and deeper pockets of wind slab likely exist on northeasterly slopes. Below the surface, the two crusts that were buried near the end of November can now be found approximately 40 cm and 70 cm down. Deeper in the snowpack a third crust from the end of October exists as a "facet/crust" combo and has been identified as a potential sliding interface. Snowpack testing in the adjacent Kananaskis Country forecast region has yielded hard but sudden results on this layer.

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