Avalanche forecast

Kananaskis

Nov 20 – 21, 2020Avalanche Canada
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Avalanche danger

Sun
Mon
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low

Highlights

Light snow and strong north winds have created pockets of reverse loaded windslabs. Recognizing the variable depth snowpack is critical right now. Both of our avalanche problems will be worse in thin areas. 

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1.5–2.5

    Watch for windslabs in alpine areas in the upper snowpack. Gullies and ridgelines are common areas to find these issues. 

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–3

    This is becoming an issue in variable depth areas, especially in the rocky alpine areas.

Confidence

Moderate -

Weather Forecast

A few scattered flurries tonight won't offer much for new snow. A bit of morning cloud will break up by 11am and hopefully offer some blue skies. Temperatures will be consistent at about -7. Alpine winds will be around 40-50km/hr from the west.

Avalanche Summary

One size 2 on an east facing, high alpine slope near Mt Lawson. It was about a meter deep and ran a couple hundred meters. 

Snowpack Summary

We continue to get small, but continuous new snow fall. At the moment there is about 10cm of new snow from the last few days. The north winds today have redistributed it into a more variable pattern. We are seeing anywhere from 20-50cm on top of the crust. With that, snow depth also varies dramatically. Rolls in the terrain are very thin, while concave areas are 90cm deep. The crust is very apparent, down 50 in today's profile. In some areas there is a slippery facet layer above it and in others it is well bonded with surface layers. Ground cover seems to be the link here. Rocky/gravel areas have a more pronounced facet layer. And it wouldn't be a snow pack structure summary without the mention of our ever-present wind slabs. These are concerning near ridges and immediate lee areas.

Terrain and Travel

  • Avoid areas with a thin or variable snowpack.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Regions covered