Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
The most problematic slopes are northerly and easterly facing, steeper than about 35 degrees, and have a stiff slab over weak snow layers in the top meter of the snowpack. Previously drifted terrain features that feel stiff or have a pillow-like appearance indicate where slabs are thicker. You are more likely to impact a weak layer and trigger and avalanche near shallow trigger points, like exposed rocks or trees, on convex rollovers, and below ridges and cliffs. Adjust your terrain selection if you see cracking in the snow, and remember, a small, isolated avalanche can lead to an unfortunate outcome in the wrong terrain.
Wet loose avalanche activity remains a possibility with warm daytime temperatures and mild overnight freezes. These avalanches are more likely later in the day. Upper-elevation slopes that received the most new snow recently could produce a larger slide. Limit travel on or below steeper slopes if you see rollerballs, pinwheels, or sink past boot tops into wet, cohesionless snow.