Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely
- Size
- 3
The chance of triggering an avalanche breaking into old faceted snow is quite low, but not impossible. The snowpack has a memory, and if we think back to a couple of months ago, the weather and snowpack was abnormal. It was thin, faceted, and trapdoor. Since then, conditions have dramatically improved. But, weak, faceted snow might still exist in areas where the snowpack may be a little thinner and more reminiscent of January and February. In those months we were still worried about large, dangerous avalanches.
To fully steer clear of this problem, avoid very steep, sustained, north facing terrain that could have thin areas underneath the surface. If it looks big, bad, and gnarly that is where a lingering chance of triggering a big, persistent weak layer avalanche still exists.