Avalanche Forecast
Issued: Apr 21st, 2024 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs.
jsmith,
Avalanche Canada
Large persistent slab avalanches may remain possible to human trigger in the alpine.
Avoid steep or convex slopes where triggering slabs is more likely.
Summary
Confidence
Moderate
Avalanche Summary
Numerous recent wet loose and slab avalanches up to size 2.5 were reported on a variety of aspects in the alpine on Saturday.
The slab avalanches likely failed on either a crust or a weak layer of surface hoar, depending on the aspect of the slope. Strong solar radiation often increases the likelihood of triggering both loose and slab avalanches. See MIN 1 and 2.
Snowpack Summary
A mix of wind affected and soft snow can be found in the alpine. Sunny aspects have a crust on the surface that may soften with daytime heating.
A few large slab avalanches were recently reported on a variety of aspects on steep alpine slopes. They likely failed on either a crust or a weak layer of surface hoar down 30 to 70 cm.
Cornices are large and looming at this time of year.
Weather Summary
Sunday night
Mostly cloudy with isolated flurries, 0 to 5 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 500 m.
Monday
Mostly cloudy with isolated flurries, 0 to 3 cm snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.
Tuesday
Mostly cloudy. 10 to 20 km/h southeast ridgetop wind. Treeline temperature +1 °C. Freezing level 1400 m.
Wednesday
Mix of sun and cloud. 10 to 20 km/h north ridgetop wind. Treeline temperature +1 °C. Freezing level 1400 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
- Avoid steep convex slopes.
- Be alert to conditions that change with elevation and sun exposure.
- Cornice failures could trigger very large and destructive avalanches.
- When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.
Problems
Persistent Slabs
A few large slab avalanches were recently reported on a variety of aspects on steep alpine slopes. They likely failed on either a crust or a weak layer of surface hoar down 30 to 70 cm.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 22nd, 2024 4:00PM
