Avalanche Forecast
Issued: Dec 24th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
rbuhler,
Avalanche Canada
Newly formed wind slabs are expected to be touchy on Sunday. These wind slabs likely sit over a weak layer which may increase their size and reactivity. Extra caution and conservative terrain selection are recommended at higher elevations.
Summary
Confidence
Avalanche Summary
On Friday afternoon, the Avalanche Canada field team reported ski-cutting a few size 1 avalanches on a north aspect convex roll feature at 1600 m elevation in the Hankin-Evelyn area. These failed on the old, hard surfaces and encompassed up to 25 cm of the recent storm snow. In the far south of the region, ski-cutting at below-treeline elevation was also triggering 10-15 cm thick slabs which were failing on a weak layer of facets.
Snowpack Summary
The new snow has buried a highly variable surface from the recent period of cold temperatures and outflow winds. The old wind-affected surface was generally very hard and in many places, the snow had been stripped to the ground. In sheltered areas around treeline, faceting had been observed and the snow surface was becoming unconsolidated.
Prior to the new storm snow, a layer of surface hoar could be found down 20 to 30 cm at treeline but had not been an active layer of concern.
Generally, the snowpack is shallow and highly variable in terms of depth, with the mid and lower snowpack presenting as settled and dense.
Weather Summary
A series of Pacific storm systems continue to impact the coast but only limited amounts are forecast to push into the inland regions.
Saturday night
Snowfall 5-10 cm, moderate to strong SW wind, treeline low around -12 °C.
Sunday
Snowfall 5-10 cm in the afternoon, moderate to strong SW wind, treeline high around -6 °C.
Monday
Snowfall around 5 cm, moderate to strong S-SW wind, treeline high around -6 °C.
Tuesday
Mainly cloudy with a chance of sunny breaks, moderate E wind, treeline high around -8 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
- The best and safest riding will be on slopes that have soft snow without any slab properties.
Problems
Wind Slabs
New wind slabs have formed as new snowfall continues to be redistributed by ongoing strong southwest winds. Where these new wind slabs overlay a weak layer of sugary facets, increased reactivity should be expected and the slabs may propagate wider than normally expected.
Older hard wind slabs from last week's northeast outflow wind event may still be reactive, but this is likely becoming an isolated problem. However, it is safest to assume wind slabs could exist on all aspects in wind-exposed terrain.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 25th, 2022 4:00PM
