Avalanche Forecast
Issued: Dec 7th, 2019 8:06AM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Persistent Slabs.
percy woods,
Parks Canada
The storm slab will be sensitive to human triggering given the right location. Take time to evaluate the snowpack both on the way up and the way down.
Summary
Weather Forecast
Light snowfall today with another 5cm expected tonight with a passing cold front. Cool and clear weather comes in behind the front for Sunday and the start of next week.
Snowpack Summary
30cm of snowfall in the last 30hrs rests on top of 70cm of settling storm snow from this past week. The previous storm created slabs on lee alpine features which are now concealed. The November 23rd surface hoar/crust layer is buried +100cm and remains reactive in stability tests. Tree wells are deep and deserve extra caution, buddy up.
Avalanche Summary
Avalanche control yesterday produced numerous size 3 and several size 3.5 avalanches in the highway corridor.
Confidence
Problems
Storm Slabs
30cm of storm snow has formed a storm slab. The new snow sits atop a previous storm slab that is still poorly bonded to faceted snow and Dec 5th surface hoar layer.
- Dig down to find and test weak layers before committing to a line.
- The new snow will require several days to settle and stabilize.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Storm slabs have the potential to step down to a buried weak layer (Nov 23 Surface Hoar/ Crust) now down +100cm. It consists of surface hoar at treeline and below, and a crust on steep solar aspects into the alpine.
- If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 8th, 2019 8:00AM
