Avalanche Forecast
Avalanche Bulletin - 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.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
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.
Travel and Terrain Advice
- Avoid open slopes and convex rolls at treeline where buried surface hoar may be preserved.
Avalanche Summary
No new avalanche activity reported in this forecast region.
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.
Weather Forecast
A few cm expected Sunday with increasing SW winds. Highs will be -5 to -8C at valley bottom and -12C at 3000m.
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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.