Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely
- Size
- 2
Poor snowpack structure remains, comprised of a dense slab over weak, faceted snow. In specific areas above treeline, the slab is cohesive enough to produce avalanches. The problem with basal facets is that even though it has been a long time since our last avalanche, you can still get surprised. All you need to do is find a trigger point. This is why we have a hard time trusting this setup. While the likelihood is decreasing, the bottom line is human-triggered avalanches remain possible. If triggered, these D2 avalanches will break to the ground, entraining the full depth of the snowpack. Likely trigger points include rocky, radical terrain, steep convexities, cliff bands, and shallow slope margins.
On some near treeline slopes, and many slopes below treeline, the slab has faceted through and has lost all cohesion. This is my strategy for quality turns, and to avoid today's avalanche problem.