Avalanche Forecast
Issued: Dec 27th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
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Avalanche Canada
Cold dry weather continues. Wind slab avalanches will be possible to trigger on steep open slopes.
Summary
Confidence
Weather Forecast
Cold arctic air sits over the region with little change in weather conditions over the next few days.
MONDAY NIGHT: Partly cloudy with a trace of snow, light wind from the northwest, treeline temperatures around -15 C.
TUESDAY: Mix of sun and cloud, no precipitation, light wind from the north, treeline temperatures around -15 C.
WEDNESDAY: Mix of sun and cloud, no precipitation, light wind from the north, treeline temperatures around -12 C.
THURSDAY: Cloudy, light flurries with 5 cm of low density snow, moderate wind from the west, treeline temperatures around -10 C.
Avalanche Summary
Some small avalanches were reported on the North Shore mountains over the weekend. These include a few size 1 skier triggered slabs on convex rolls in the Seymour backcountry (see photos in the MIN reports here and here) and some loose dry avalanches in the top 10 cm of low density snow.
Similar avalanche activity can be expected in the upcoming days, although there will be potential for larger slabs at upper elevations if the wind increases and begins to transport snow.
Snowpack Summary
Cold weather has left 20-40 cm of low density snow on the surface. There is potential for northerly winds to begin transporting this snow into wind slabs, perhaps in unusual cross-loading or reverse-loading patterns. This low density snow sits above a mostly settled and bonded snowpack with a few crusts in the top 100 cm.
In the north of the region, a concerning layer of facets (sugary snow) can be found down 100-200 cm over a crust that formed in early December. This layer is transitioning from stubborn to unreactive as the settling snow above makes it harder to trigger. This problem is particularly hard to predict and tricky to manage. Get more details and photos in our forecaster blog.
For a more detailed description of snowpack layers, watch the snowpack summary video produced by North Shore Rescue on Dec 24.
Terrain and Travel
- Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
- Make observations and assess conditions continually as you travel.
Problems
Wind Slabs
Winds have shifted from south to north with an ample supply of light, cold snow to drift into slabs. Watch for unusual cross-loading or reverse-loading patterns in wind-exposed areas.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 28th, 2021 4:00PM
