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Archived

Avalanche Forecast

Jan 31st, 2017–Feb 1st, 2017
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
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Fragile new cornices hanging over wind slabs can surprise you; try to minimize exposure to this hazard. Don't underestimate the effects of the sun on the snowpack, even with the current cold temperatures.

Weather Forecast

  Looks like it will be a beautiful day, although a cold Arctic air mass has moved in with alpine highs of -16C. Winds are forecast to be north 10km/h and no snow. Even with these cold temperatures, the sun will make it seam much warmer than it is and can affect the surface snow on steep solar aspects.

Snowpack Summary

Sustained strong winds have caused extensive wind effect in the alpine and exposed tree line areas. Conditions will be highly variable from wind scoured ridges, wind slabs, hard slabs and deep wind drifts. Any freshly wind loaded slopes are suspect for human triggering of slabs.

Avalanche Summary

A natural avalanche cycle occurred in the highway corridor yesterday, initiated by strong south winds. Eight were size 2.5 wind slabs, one was a size 3.0 triggered by a cornice fall.

Confidence

Avalanche Problems

Wind Slabs

Newly formed wind slabs from the recent strong wind event have had minimal time to start bonding. Below ridge crests, cross-loaded features and any wind loaded area are suspect for human triggering.
Avoid steep convexities or areas with a thin or variable snowpack.Avoid unsupported slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3