Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely
- Size
- 3
In isolated areas, it may still be possible to trigger an avalanche failing on a buried persistent weak layer of sugary faceted grains. Steep, rocky terrain and paths that have avalanched previously this season are most suspect. Low likelihood does not mean impossible, but there are some things to consider: you'll probably see no hints of instability (no cracking, no collapsing) before the avalanche is triggered. And, sad to say, you may dig a snowpit here, but then find it very different three to four turns down the slope.
This uncertainty requires strict travel protocols and choosing terrain that does not amplify your overall risk (ie-getting swept into trees or over a cliff).