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Archived

Avalanche Forecast

Jan 20th, 2018–Jan 21st, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

There is still lots of uncertainty on how the surface hoar at treeline will react. Make conservative terrain choices at this elevation and take the time to look in the snowpack for this problem.

Weather Forecast

A few cm expected Sunday with increasing SW winds. Highs will be -5 to -8C at valley bottom and -12C at 3000m.

Snowpack Summary

Recent winds have developed windslabs on alpine and treeline lee slopes. In sheltered areas the upper snowpack has 20-30cm of soft slab over the Jan 6 surface hoar, and this layer has been reactive in test results. The Dec. 15 surface hoar layer is still a concern in the region, in many areas this layer is 50-80 cm down with a settled slab above.

Avalanche Summary

No new avalanche activity reported in this forecast region.

Confidence

Avalanche Problems

Wind Slabs

Recent snow and wind are have created new windslabs on lee slopes at alpine and treeline elevations. The winds have been from many different directions over the past few days and have formed these slabs on numerous aspects. 

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Dec 15 layer is a concern mainly at treeline around Field, Emerald Lake and Little Yoho - this is a very specific band, although avalanches initiated could run into areas below treeline.
Avoid open slopes and convex rolls at treeline where buried surface hoar may be preserved.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5