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Archived

Avalanche Forecast

Dec 24th, 2020–Dec 25th, 2020
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
Below Threshold
The avalanche danger rating in the alpine will be below threshold
Treeline
Below Threshold
The avalanche danger rating at treeline will be below threshold
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Kananaskis.

Merry Christmas! Winds were strong on Thursday and we saw widespread new windslabs develop and in some places fail, triggering the deeper basal layers. These upper snowpack instabilities are definitely skier triggerable. Be conservative in your choices! 

Confidence

High -

Weather Forecast

Well the winds were howling on Thursday but they are forecast to begin to back off a bit on Friday. Winds on Friday will be more moderate out of the SW with day time highs in the -6C range. No new precipitation is expected as we will be under the influence of a high pressure ridge until the 26th when we are expecting to get some new snow. 

Avalanche Summary

A few large avalanches were observed over the past 24hrs failing down up to as much as 2m on the November crust. One of these large slides was likely triggered by a cornice collapse. In addition to these large events, there were numerous windslabs up to sz 2 failing in steeper alpine features mainly on N and E aspects.

Snowpack Summary

Strong winds is the main thing to talk about with regards to the snowpack. Winds over the past 24hrs have been strong out of the SW and most alpine areas have been highly affected. In some areas we are seeing windslabs overloading the basal November crust triggering large avalanches that are running to the valley floor. Expect to encounter windslabs at open areas at treeline and expect the windslabs to fail in steep or crossloaded areas down 40-60cm at the Dec 8th interface.  

Terrain and Travel

  • Avoid steep convex slopes.
  • Back off steep and aggressive lines, stick to simple terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

Avalanche Problems

Wind Slabs

Windslabs are widespread in alpine areas and in open areas down into treeline. Be aware of the potential for a upper snowpack instability to step down to the basal crusts. 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely - Very Likely

Expected Size: 1.5 - 2.5

Deep Persistent Slabs

We did see this as a failure recently, both natural and with explosives. This suggests we are in the hard, but not impossible to trigger phase. 

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5

Cornices

Cornices have been growing of late and failing triggerring avalanches on the underlying slopes 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5