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Archived

Avalanche Forecast

Feb 18th, 2021–Feb 21st, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
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

Regions: Waterton Lakes.

Increasing SW wind continues to build wind slabs with variable reactivity. Use caution as you transition in to wind effected terrain.

Weather Forecast

Friday: Cloudy with sunny periods and isolated flurries. Alpine high -2. Moderate SW wind with strong gusts.

Saturday: Mainly cloudy with isolated flurries. Alpine high of -4. Moderate to strong SW wind.

Sunday: 15-30cm of snow with freezing levels rising to 1600m through the storm. Moderate SW wind with gusts up to 120km/h.

Snowpack Summary

Southwest winds have returned building wind slabs which sit over a layer of facets. Facet layer has developed over a variety of hard surfaces including old wind slab and a deteriorating melt freeze crust below 1900m. Mid snowpack has become faceted, especially in shallow areas east of Cameron Lake.

Avalanche Summary

Ski cut's produced size 1 loose dry avalanches in steep sheltered terrain and size 1 wind slabs in on lee slopes.

No new natural avalanche activity observed.

Confidence

Avalanche Problems

Wind Slabs

Wind slabs may propagate farther then expected due to underlying facet layer and will remain the primary concern until the warm storm arrives on Sunday.

  • Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.
  • Use caution in lee areas. Recent wind loading has created slabs over weaker snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2