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Archived

Avalanche Forecast

Dec 28th, 2021–Dec 31st, 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
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
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.

Cold temps will persist this week. Be prepared with lots of layers and warm drinks. Plan to be out of the backcountry early as the days are still short.

Weather Forecast

Wednesday: Clear with west winds increasing after lunchtime to 80km at ridge top. Cold temps with a high of -20.

Thursday: Overcast and flurries, wind decreasing through the day. High -18.

Friday: Clearing light wind High -22.

Snowpack Summary

Moderate to strong winds have built windslabs up to 30 cm deep on top of 60-90 cm of unconsolidated storm snow. This overlies old windslabs 40-60 cm thick and facets above the Dec 4 crust. A 20-60 cm thick Nov MFcr complex completes the snowpack to ground. HS at TL is 130 - 180cm

Avalanche Summary

No new avalanches observed or reported this week. Thanks to everyone posting on the Mountain Information Network, keep up the great work.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

Moderate to Strong winds have formed windslabs in lees at all elevations

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

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

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

  • If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5

Loose Dry

Steep sheltered locations

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2