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Archived

Avalanche Forecast

Dec 20th, 2021–Dec 21st, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Kananaskis.

Great skiing right now, but it's still worth taking the time to evaluate steeper terrain in the Alpine. On-going wind loading in the Alpine could lead to an increased likelihood of human-triggering.

Confidence

High -

Weather Forecast

Tuesday should be mainly sunny with a cold start that will warm to -12. Winds will be moderate from the west. Wednesday will bring light flurries with heavier snow beginning early Thursday.

Avalanche Summary

Nothing new today, but there is a report on the MIN of a skier triggered size 2 wind slab in the Hero's Knob area on Sunday.

Snowpack Summary

With the very cold temperatures last night the surface snow is staying low density and there has been minimal recent wind effect up to at least 2500m. Moderate wind transport today at mountaintop is scouring some high alpine slopes while creating fresh wind slabs in the immediate lee of ridge features. However, so far these wind slabs do not extend far down-slope. The mid-pack and basal layers remain strong with a number of frozen crusts. Forecasters are monitoring the Dec 1st crust (down 70cm on average) as faceting has been observed around the crust, but so far this layer has been inactive.

Terrain and Travel

  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.

Avalanche Problems

Wind Slabs

These wind slabs are now buried, are specific to lee and cross loaded features, and are generally being found above 2300m.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5