Persistent Slabs
- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Possible
- Dimensione
- 2–3
This zone sits in the "sweet spot" for hosting a lingering persistent slab avalanche problem. Here, the weak layer of snow near the ground is well-developed and exists in many locations. The slab overlying this weak layer is thinner than in the zones to the north and west, which makes it easier for you to trigger. In addition, the thin snowpack creates strong temperature gradients that don't allow for the weak snow to heal quickly. For these reasons, triggering an avalanche that fails on this weak snow remains a possibility today. Watch the video at right/above for a little more detail about this situation.
The weak snow responsible for this problem exists on shaded middle elevation slopes and most slopes at upper elevations. You are most likely to trigger an avalanche that fails on this snow in very steep, rocky, wind-affected terrain (see photo here). Here, the overlying slab is variably thick which makes it easier for your weight to impact the weak snow underneath. Any slide you trigger involving this weak snow is likely to be large and destructive.