Avalanche Forecast
Issued: Feb 15th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs and Deep Persistent Slabs.
llarson,
Avalanche Canada
As snowpack totals increase through the day, expect to find reactive storm slabs at all elevations and touchy wind slabs at treeline and alpine elevations. Conservative terrain travel is recommended.
Summary
Confidence
Moderate
Avalanche Summary
No new avalanches reported in the region.
Looking forward, storm and wind slabs will likely be reactive as the new snow settles and possibly touchy where this new snow is affected by wind like in lee (north to east) terrain features at all elevations.
The basal snowpack remains questionable and should still figure into terrain selection around steep features with shallow or variable snowpack areas where these layers may be more easily triggered by a person or machine as well as large wind slab or cornice releases.
Snowpack Summary
Snow starting overnight and continuing through the day will bring total snowfall between 20 and 30 cm to the area. This new snow coupled with moderate to strong southwest winds will be building storm slabs and wind slabs at all elevations. Cornices will also continue to grow over the next few days.
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
Wednesday night
Cloudy with snowfall, accumulation 5 to 10 cm, 30 to 40 km/h southwest winds, treeline temperatures -6 °C.
Thursday
Cloudy with snowfall, accumulation 10 to 20 cm, 20 to 30 km/h southwest winds, treeline temperatures -4 °C.
Friday
Cloudy with flurries, accumulation 2 to 5 cm, 20 to 30 km/h southwest winds, treeline temperatures -5 °C
Saturday
Cloudy with flurries, accumulation 2 to 5 cm, 30 to 40 km/h southwest winds, treeline temperatures -3 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Storm slab size and sensitivity to triggering will likely increase through the day.
- Storm slabs in motion may step down to deeply buried weak layers resulting in very large avalanches.
- In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
- Avoid exposure to slopes that have cornices overhead.
Problems
Storm Slabs
Roughly 15 to 30 cm of new snow over the next 36 hours will develop into storm slabs at all elevations. This storm is associated with moderate to strong southwest winds so wind slabs are possible and may be touchy as the snow starts to accumulate.
Aspects: All aspects.
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 16th, 2023 4:00PM
