Persistent Slabs
- Hochgebirge
- Waldgrenze
- Unterhalb der Waldgrenze
- Wahrscheinlichkeit
- Unlikely
- Größe
- 1
Although unlikely, above treeline you may find isolated pockets of slab that rests on top of weak faceted snow. These avalanches would be small but could have serious consequences in steep exposed terrain as they may break close to the ground. Obvious signs of instability most likely will not be present, but it's always a good idea to dig a quick pit which is easy right now. If an ECT or PST is part of your repertoire, try doing longer tests 2m+ PSTs and 1.5m+ ECTs. We've had results in your standard lengths, with slab fractures in longer tests. It will be difficult to get wide propagating avalanches, but you could find pockets out there in the more exposed wind effected terrain.
This is the crown from an avalanche we triggered on 1/9 during the storm. It shows the faceted weak layers that the avalanche failed on beneath the slab. These weak layers will become a concern again when we do get more snow and loading.
(1/9/2026) Photo: Charlie Harrison