Avalanche Forecast
Kootenay Boundary
Special Avalanche Warning in effect for the interior ranges. Copy this address to view details: http://bit.ly/2nSOUyX
Avalanche Problem 1: Storm Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
- Travel in avalanche terrain is not recommend. Choose conservative, simple terrain.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
The snowpack is complex and continues to produce very large avalanches on several weak layers buried below the surface.
Travel and Terrain Advice
- Be mindful that deep instabilities are still present and have produced recent large avalanches.
Avalanche Summary
On Thursday, avalanche control using explosives triggered numerous loose wet avalanches up to size 2 and a significant size 3 storm slab avalanche. These were reported from SE-SW slopes above 1900 m. The snowpack is complex, it requires patience and discipline. Natural avalanche activity may spike with the first hit of sun then start to taper off through the weekend, slopes will remain primed for human triggers.
Snowpack Summary
Recent snow accumulations vary showing 10-30 cm across the region adding more load and stress to the upper snowpack. This now brings 90-140 cm of settled snow over two surface hoar/ crust layers that were formed early to mid-January. Digging deeper 160-200 cm sits the mid-December surface hoar layer and near the base of the snowpack exists a crust/ facet interface which could be triggered by a large load like a step down avalanche or cornice failure.
These persistent weak layers lurk within the snowpack and continue to be reactive, producing large and destructive avalanches. The snowpack is extremely complex and requires respect and diligence at this time.
Weather Forecast
Friday: Cloudy with sunny periods. Alpine temperatures near -11 and freezing levels dropping to valley bottom. Ridgetop winds light from the northeast.
Saturday: Sunny. Alpine temperatures near -10 and freezing levels valley bottom. Light winds from the west.
Sunday: A mix of sun and cloud. Alpine temperatures -7 and freezing levels rising to 800 m.
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Storm slabs remain reactive on Friday. The first hit of sun will likely trigger loose dry avalanches which could step down to deeper layers initiating large and destructive avalanches.