Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2
There is a slab of cohesive snow about 15-20 inches thick that can produce avalanches fracturing on a persistent weak layer of old, faceted snow from November. This situation is here to stay for some time. Several groups on Saturday experienced collapses and audible whumpfs which are clear warning signs. Craig describes the set up in his video from Wolf Creek Pass below: