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Archived

Avalanche Forecast

Dec 21st, 2020–Dec 22nd, 2020
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
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.

Avoid Avalanche terrain. An avalanche cycle will be on going.

Confidence

Moderate -

Weather Forecast

Snow will increase throughout Monday evening right in to Tuesday could bring 20-40cm all with moderate winds switching from the South to the north.  

Avalanche Summary

A few natural slab avalanche up to size 2 on all aspects except for west aspects from yesterday. Limited observation due to visibility today but no sluffing from steep terrain observed

Snowpack Summary

Up to 5cm of new snow over night, 30-80cm overlying the Dec 8th surface hoar, facet, crust interface. Widespread wind affect in Alpine in to tree line features. Caution for reverse loading with the strong North winds. Settlement in the upper snow pack might make it more sensitive to skier traffic around tree line features.

Terrain and Travel

  • Avoid all avalanche terrain during periods of heavy loading from new snow and wind.
  • Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.

Avalanche Problems

Storm Slabs

20-40 of new snow over the past day and 20-40cm of snow expected from this new wave would bring the new snow to 40-80cm. Storm slabs will be widespread and sensitive to triggering. 

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

Elevations: Alpine, Treeline.

Likelihood: Very Likely - Almost Certain

Expected Size: 1.5 - 2.5

Wind Slabs

Previously buried wind slabs will become more reactive with load.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Very Likely

Expected Size: 1.5 - 2.5

Deep Persistent Slabs

Might become reactive with larger loads and larger triggers like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2.5 - 3.5