Avalanche forecast

Kananaskis

Mar 7 – 8, 2014Alberta Parks
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Archived · expired 13 years ago

Avalanche danger

Sun
Mon
Alpine
4 · High
Treeline
4 · High
Below
3 · Considerable
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Highlights

A natural, heat induced cycle is just around the corner. Conditions will change very quickly with the warm weather forecast and current snow conditions. Even light loads, solar pin wheeling for example, may be a trigger for a large avalanche.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–5
    Today proved that large avalanches are likely given the weather pattern. Avoid large features and overhead terrain. Choose mellow terrain and give the conditions lots of respect right now.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    These slabs are still growing and are a problem in themselves, and as a trigger for deeper layers. With the warm snowpack, and rapid settlement these slabs could become reactive to human triggering very quickly.

Confidence

Good

Weather Forecast

The warm weather is here. Today saw a major swing in the air temperature and considerable solar effect. We can expect the same for tomorrow and Sunday. We are at the time of year when things change extremely fast. Our forecasts for tomorrow are saying temps of around zero on the Spray Rd and just below zero in the alpine. The thin cloud will amplify the solar effect tomorrow. The alpine winds will continue in the strong range for most of forecast area. As for snow, we will see some flurries, but no significant accumulations. For Sunday, we are expecting another pulse of snow. Up to 20cm's.

Avalanche Summary

The clear skies today revealed a number of avalanches that had released during the storm. It appeared the failure layer was within the storm snow. All observed avalanches were in the alpine and ranged from N-E-S aspects. Of more importance today was the very touchy Feb 10th layer. Forecasters worked their way up a treed ridge and remotely released 2 large avalanches from 30m and 100m away. The specifics are: 2 avalanches, both Sz2, skier remote(30 & 100m), NE-E aspect, 35-45 degrees, the terrain was crossloaded and upper treeline. The furthest avalanche was triggered from the opposite side of the ridge. Both slides ran to mid path. Other observations today included another natural size 2 on an E aspect that originated out a variable depth alpine feature. Again, the Feb 10th layer is taking the blame.

Snowpack Summary

A few cm's of new snow overnight. The main story today was the drastic settling of the upper snowpack. The temperature rose dramatically today with an almost immediate settling of the snowpack. Up to 2300m the upper 10cm is now moist snow. All aspects have this problem to a certain extent. Obviously moist snow on the south aspects is more pronounced. In the alpine there was still some transport helping to build the current windslabs. The Feb 10th layer is down a meter in lee areas at treeline, and very reactive. Lots of whumphing and cracking in the PM. On south aspects, there is an old sun crust that is at the base of the storm snow, down 20-30. This may become a problem as it continues to warm.

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