Avalanche Forecast
Issued: Feb 24th, 2025 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs and Deep Persistent Slabs.
Parks Canada,
Avalanche Canada
The snowpack is gradually adjusting to the new load from the recent storm. While minimal natural avalanche activity has been observed since the storm, several human-triggered avalanches have been reported over the past two days. Conservative terrain choices will be the best risk mitigation strategy over the next few days.
Summary
Confidence
Moderate
Avalanche Summary
The local ski hills reported triggering several avalanches today using explosives and ski cuts, up to size two. One notable observation was a ski cut that initiated a size 2 deep persistent slab, 1 meter deep.
A skier accidental size 2 wind slab that likely propagated on the facets under the storm snow was observed on Twin Cairns Sunday, with one person going for a rocky ride but ending up relatively unscathed.
Snowpack Summary
10-30 cm of new snow has fallen with mild temps and strong S-SW winds helping to form new wind and storm slabs. This new snow sits over a layer of weak facets, surface hoar or sun crust from the cold snap.
The mid-pack is generally weak facets, while depth hoar and crusts form an even weaker base. The snowpack is the weakest in eastern areas where snow depths are low. In these areas, the basal weaknesses should be carefully considered.
Weather Summary
A southwest flow may bring light flurries to the forecast region on Tuesday, with snow accumulation ranging from 0 to 5 centimeters by Wednesday. Ridgetop winds are expected to be moderate, coming from the W-SW. Daytime high temperatures will be around +5°C at the valley bottom on Tuesday.
Terrain and Travel Advice
- Make conservative terrain choices and avoid overhead hazard.
- Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
- Loose avalanches may step down to deeper layers, resulting in larger avalanches.
Problems
Persistent Slabs
10-30 cm of new snow and strong S-SW winds have loaded lee areas at treeline and above with new slabs up to 60 cm deep. This is sitting on a weak layer of facets, surface hoar or sun crust. Human triggering will remain likely in steep or wind loaded terrain for the next few days.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
The recent storm has added load to an already shallow and weak snowpack. With this additional weight, we suspect there may be a reawakening of this problem in isolated areas. Areas of concern include thin, shallow, and rocky slopes.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 25th, 2025 4:00PM
