Avalanche Forecast
Issued: Feb 16th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
llarson,
Avalanche Canada
New snow and moderate to strong winds are building touchy wind slabs at treeline and alpine elevations. Conservative terrain travel is recommended.
Summary
Confidence
Moderate
Avalanche Summary
Natural and human-triggered size 1 to 1.5 wind slabs were reported in the Pine Pass area.
Looking forward, new wind slabs are likely to form directly lee of ridges and ribs. These new wind slabs are forming over old wind slabs that are generally bonding to previous surfaces but may be triggered by large loads like a cornice.
The lower snowpack is slowly gaining strength, continue to manage this problem by avoiding terrain that is steep, rocky, and shallow.
Snowpack Summary
Roughly 20 to 30 cm of new snow with the greatest amounts near Pine Pass is being redistributed by moderate southwest winds. New wind slabs in open terrain at all elevations will remain reactive for the near future. Cornices are becoming overhanging and reactive, and new snow and wind will further develop their growth.
The mid-pack is gaining strength and consists of rounding facets and melt-freeze crusts that are starting to degrade.
Near the base of the snowpack, a persistent weak layer composed of large and weak facets formed in November is strengthening slowly. This layer is most likely to be triggered in thin, rocky alpine and upper treeline terrain.
Weather Summary
Thursday night
Cloudy with snowfall tapering overnight, trace accumulation, 40 to 50 km/h southwest winds, treeline temperatures -12 °C.
Friday
Cloudy with flurries, increasing snowfall overnight accumulation 10 to 15 cm, 30 to 40 km/h southwest winds, treeline temperatures -10 °C.
Saturday
Cloudy with flurries easing in the afternoon, accumulation 5 to 10 cm, 30 to 40 km/h southwest winds, treeline temperatures -10 °C.
Sunday
Cloudy with snowfall, accumulations of 10 to 15 cm, southwest winds 40 to 50 km/h, treeline temperatures -10 °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.
- Avoid exposure to slopes that have cornices overhead.
- In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
Problems
Wind Slabs
Roughly 20 to 30 cm of new snow with moderate to strong winds have developed wind slabs in open terrain at all elevations.
Aspects: North, North East, East, South East, North West.
Elevations: All elevations.
Likelihood
Expected Size
Deep Persistent Slabs
A layer of large, weak facets sits near the base of the snowpack. This layer is most prominent in upper treeline and lower alpine elevations. Riders are most likely to trigger an avalanche on this layer in steep, shallow terrain.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 17th, 2023 4:00PM
