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Archived

Avalanche Forecast

Dec 7th, 2021–Dec 8th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
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

Regions: Glacier.

Stormy weather, strong winds, and new snow have increased the hazard to Considerable at higher elevations.

Weather Forecast

~15cm of new snow and strong SW winds are forecasted for Tuesday evening, with cool temperatures. Another 10cm is likely to fall throughout the day on Wednesday with similar strong winds and cool temperatures again. Continued light precipitation is forecasted for the remainder of the week.

Snowpack Summary

At tree line and below, the Dec 1 crust is buried by 10-40cm of snow. In the alpine, 35-50cm of snow has been redistributed by moderate Westerly winds and either lies on previous wind effect or icy bed surfaces from last weeks avalanche cycle. The mid and lower snowpack is rounded and well bonded. Travel conditions at lower elevations is rugged.

Avalanche Summary

No new avalanches were observed in the Highway Corridor, or reported from the Backcountry yesterday. Unreactive wind slabs were noted in a MIN report from Young's Peak, ~10cm deep with no propagation. On Sunday a field team skier triggered a size 1 soft slab in steep, unsupported terrain where the new snow sat on the Dec 1 crust.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Strong wind and new snow tonight, will form slabs in the Alp and exposed features at TL. Avalanches will be most prominent on lee slopes and in cross-loaded terrain features; however, local topography will dictate where the slabs ultimately lie.

  • Use caution in lee areas. Recent wind loading has created wind slabs.
  • Use caution above cliffs and terrain traps where small slab avalanches may have severe consequences.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3