Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
Weak snow is buried 1-2 feet below the surface. Triggering an avalanche large enough to bury a person is likely in very steep, shaded terrain above 9,000’. Recent snow is stressing weak layers and increasing the likelihood of a rider triggering a large avalanche. Steep, sheltered, northerly-facing slopes harbor the weakest snow and are the most dangerous. Other aspects could also produce avalanches and should not be ruled out. You may not see signs of instability like recent avalanches or hear collapsing before triggering a large avalanche. Remotely triggering a large avalanche above you from gentler terrain below is a real possibility. Give yourself a margin of safety around steep slopes today.
These slabs were triggered by snowmobilers near Grouse Mountain last week. Expect similar, but deeper, avalanche activity today with additional snowfall in the past 24 hours.
2/12/2026