Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2
Slab avalanches fracturing on a persistent weak layer of old, faceted snow are likely today. The old snow that sat on the ground through much of November exists on west, north, and east-facing slopes where these avalanches can be triggered. In terms of elevation, this problem exists mostly near and above treeline, but I suspect there may be a few places below treeline harboring this problem.
The layers of weak, faceted old snow are evident in the bottom third of the snowpit wall in this photo from Wolf Creek Pass (Photo - Hoffman)