Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely - Possible
- Size
- 1–1.5
Old hard wind slabs over weak sugary facets on a hard crust could still be human-triggerable in isolated locations, mainly in rocky, steep alpine terrain.
Keep using safe travel strategies even when the hazard is low. Avalanches remain possible in steep alpine terrain.
Old hard wind slabs over weak sugary facets on a hard crust could still be human-triggerable in isolated locations, mainly in rocky, steep alpine terrain.
On Saturday a skier accidentally triggered a large avalanche near Hudson Bay Mountain. It is suspected that this avalanche failed on the facet/crust combination described in our snowpack summary. Check this MIN post for full details.
In general, up to 10 cm of soft, faceted snow overlies hard, wind-affected snow in alpine terrain. Wind-exposed terrain may be scoured down to hard surfaces, while a sun crust exists on south-facing slopes.
In steep, exposed alpine terrain, old, hard wind slabs may sit atop weak faceted crystals and a crust, down roughly 20 to 30 cm from the surface.
The mid and lower snowpack is generally well-bonded and strong.
Wednesday Night
Clear skies. 10 to 30 km/h northwest ridgetop wind. Treeline temperature -1 °C.
Thursday
Sunny. 20 to 40 northwest ridgetop wind. Treeline temperature -1 °C.
Friday
Mostly cloudy with 0 to 3 cm of snow. 60 to 80 km/h west ridgetop wind. Treeline temperature -3 °C.
Saturday
Cloudy with 0 to 5 cm of snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature -5 °C.
More details can be found in the Mountain Weather Forecast.