Avalanche forecast

Kananaskis

Dec 29 – 30, 2017Alberta Parks
View on map
Archived · expired 9 years ago

Avalanche danger

Sun
Mon
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
2 · Moderate
Open full map

Highlights

Our weak snowpack just had 20-30cm of snow put on top of it and another 10 is forecast for tonight.  Time to rein yourself in and allow the snowpack to settle to this new load.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    Recently buried wind slabs are present in the Alpine on all aspects, and in isolated spots at Treeline. Steep and unsupported terrain are areas where triggering is more likely.

  • Loose Dry

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    1–2
    Occurring in steeper terrain but running into skiable lines. Ice climbers should be aware of this problem.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2
    New storm slabs are building in Alpine terrain with the northern winds.  These slabs are overlying weak facets and windslabs in some areas.  Use caution as you transition into more alpine terrain.  Avoid steep and unsupported terrain.

Confidence

High -

Weather Forecast

Cold temps are expected to continue for a few more days until conditions begin to warm up late in the day on Sunday. Overnight on Friday we can expect another 5-10cm of snow to fall with winds pushing into the moderate range out of the north before they calm down during the day on Saturday. 

Avalanche Summary

A few slabs were observed failing with the recent snow on steeper unsupported terrain up to sz 1.5. These mainly occurred on southerly aspects. Of note some of the loose dry avalanches of late have gone very far and are sluffing fast entraining lots of snow as they travel down the slope. Ice climbers should pay particular attention.

Snowpack Summary

21cm storm snow overnight at Burstall with 30cm overnight at Aster lake. Storm snow tapers to 15cm at lower elevations. This new snow fell with light winds out of the north and as a result we are seeing some reverse loading in a few areas in the Alpine. Watch for new windslabs and storm slabs 20-30cm deep in alpine areas and at treeline in steeper terrain. These slabs will be slow to settle out with the cooler temps. Down 40-50cm in the snowpack is the December 15th surface hoar layer being found up to 2250m. A lack of a cohesive slab overlying this layer has prevented it being a problem but we can expect it to develop over the next few days as the snow settles. Pay attention where this layer is and isnt as you travel.

Regions covered