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Avalanche Forecast

Nov 27th, 2022–Nov 28th, 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
1: Low
The avalanche danger rating at treeline will be low
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

Assess conditions as you travel - snow may hide reactive slabs or, more likely, early-season hazards.

Confidence

Low

Avalanche Summary

On Sunday, explosives triggered size 1-2 storm slabs and a size 1.5 natural storm slab avalanche was reported.

Snowpack Summary

10-30 cm snow accumulated by Sunday morning at upper elevations, and strong southwest winds quickly impacted any loose snow in open and exposed terrain.

Recent snow covered a crust at upper elevations and to moist snow lower down. Where the snowpack is growing, a weak drought layer is down 20-50 cm. This layer consists of hard, wind-affected snow in the alpine, surface hoar or facetted snow in sheltered areas, and a crust on solar aspects and on all aspects below 2200 m. Below this layer, several other facet-crust interfaces exist in the snowpack.

Terrain features poke through a building snowpack that ranges from 80-150 cm in the alpine and 50-70 cm at treeline. Below treeline is below the threshold for avalanches.

Weather Summary

Sunday night

Cloudy with isolated flurries, trace accumulation and clearing overnight. Light to moderate north wind, treeline low temperatures -20 C, and freezing level valley bottom.

Monday

Sunny and cold. Light to moderate northeast wind, treeline high temperatures -9 C.

Tuesday

Cold with a mix of sun and cloud and isolated flurries. Light northeast wind, treeline temperature -12 C.

Wednesday

Incoming precipitation and wind, 20-30 mm, strong southwest wind, treeline temperatures rising to -4 C, freezing level rising above valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for areas of hard wind slab on alpine features.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.

Avalanche Problems

Wind Slabs

Strong to extreme winds have polished open terrain and left stubborn wind slabs. Be mindful that winds are shifting more northerly, this could change where wind slabs lurk.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5