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Summary
Confidence
Fair - Due to the number of field observations
Weather Forecast
A ridge of high pressure is strengthening a predominant northwesterly flow which will invade the Interior regions. This will bring relatively dry cool air. Ridgetop winds will blow light-moderate from the northwest and alpine temperatures will hover near -15. Skies will likely remain cloudy with some sunny periods Friday and Sunday. Light precipitation is expected Saturday.
Avalanche Summary
On Thursday, explosive controlled size 2.5 occurred and stepped down to the deep persistent early November rain crust. The mid-December buried surface hoar layer remains touchy to skier and rider triggers with several avalanches up to size 1.5 on Wednesday. I don't expect things to improve over the holiday period and suspect this layer is primed for human triggers. Remote triggering up to 100 m is still a concern.
Snowpack Summary
New snow 10-20 cm fell Tuesday night, with southern locations seeing the higher amounts. This brings storm snow totals 30-70 cm above a very touchy surface hoar layer that was buried mid-December. Below 2100 m this slab sits on a thick, solid crust that has been acting as a perfect sliding layer. This persistent slab remains touchy to the weight of a skier and rider, especially in wind effected areas. A hard rain crust with facets from early November is buried over 1 m down and is currently unreactive, however; triggering from shallow rocky and unsupported terrain remains a concern and should be kept on your radar.
swerner,
Avalanche Canada
