Avalanche Forecast
Issued: Dec 11th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Deep Persistent Slabs and Wind Slabs.
MF,
Avalanche Canada
The natural avalanche cycle over but human triggered avalanches are still likely. Continue to practice conservative decision making.
Summary
Confidence
Moderate
Avalanche Summary
On Saturday a size 2 skier triggered avalanche failed as a deep persistent slab at treeline and ran 600m scrubbing to ground. One skier was caught and sustained injuries that required an overnight rescue.
Numerous Na slab avalanches up to size 2 have occurred in the alpine over the past few days.
Snowpack Summary
Last week's storm snow has settled to 20-50cm over the Dec 2 weak layer which consists of the basal facets and surface hoar. A rain crust (1 to 7cm thick) exists within the storm snow up to 2300m on all aspects. The thickness of the rain crust tapers with increasing elevation.
Weather Summary
Tuesday will be mainly sunny with light southwest ridgetop winds and a temperature inversion, alpine highs of -6°C to -3°C. Wednesday will be much the same with increased winds and slightly higher freezing level. The next potential for snow is Thursday.
For more information, click Mountain Weather Forecast.
Terrain and Travel Advice
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
- Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.
Problems
Deep Persistent Slabs
A buried crust has bridged this problem at lower elevations but pay attention to where it disappears, where there is no crust there will be a higher likelihood of triggering the persistent weak layer.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
Previous strong winds have created reactive windslabs in the alpine and treeline.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 12th, 2023 4:00PM
