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Archived

Avalanche Forecast

Dec 30th, 2021–Jan 2nd, 2022
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Waterton Lakes.

The presence of breakable windslabs makes ski quality variable. Look for sheltered terrain to preserve your knees.

Weather Forecast

Friday: Sunny with cloudy periods. Light NE winds. Alpine high -21.

Saturday: Cloudy with sunny periods. Mod-strog west winds. Alpine High -15 Low -22.

Sunday: Mix of sun and cloud. Strong west winds. Alpine High -8 Low -15.

Snowpack Summary

Strong to extreme SW winds have formed 10 cm firm wind slab on top of christmas storm snow. Beneath this lies a series of right side up wind slabs. Facets are found above Dec 4 crust down 80-120 cm. A 20-60 cm thick Nov crust complex completes the snowpack to ground. No results on compression test from pits dug on Forum Ridge on Dec 30.

Avalanche Summary

Evidence of natural avalanche cycle, size 1- 2, with overnight extreme winds. A natural 2.5 was observed on Mount Custer, likely wind triggered. Thanks to everyone posting on the Mountain Information Network, keep up the great work.

Confidence

Wind effect is extremely variable

Avalanche Problems

Wind Slabs

Strong to extreme SW winds have formed windslabs in lees at all elevations

  • Breakable crust makes for tough ski conditions.

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

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2.5

Persistent Slabs

No avalanches observed on this layer this week, however with a large enough trigger this layer could produce results.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3.5