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Archived

Avalanche Forecast

Dec 20th, 2021–Dec 21st, 2021
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
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: Northwest Coastal.

Use extra caution near ridge crests and steep roll overs. New storm and wind slab will form throughout the day as a result of the incoming weather.

Confidence

Moderate -

Weather Forecast

Monday night: No new snow expected. Low of -19 at 900m. Moderate to strong Northwest winds.

Tuesday: 15cm of new snow with strong Southwest winds. High of -12 at 900m.

Wednesday: some flurries with light North winds. High of -10 at 900m.

Thursday: no new snow expected. Light to moderate North wind and a high of -14 at 900m.

Avalanche Summary

Several Loose dry avalanches to size 2 were observed on Westerly aspects.

Explosives triggered several size 2.5 avalanches on lee and cross loaded features on Southerly aspects at 1700m.

Snowpack Summary

Variable winds over the last week mean wind slab could be found on all aspects in exposed terrain. 

The December 18th surface hoar/facet layer is down 15cm.

The December 7 persistent weak layer is now typically down 50-70 cm, though some professional operations are saying that it is getting harder to find. This interface may include a crust, facets, or surface hoar.

Snowpack depths vary greatly across the region, expect to find anywhere from 100-300 cm of snow around treeline.

Terrain and Travel

  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Watch for fresh storm slabs building throughout the day.

Avalanche Problems

Storm Slabs

New storm and wind slab will form as a result of the incoming weather. Sensitivity to triggering will be greatest where wind effect is evident.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 2