Persistent Slabs
- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Possible - Likely
- Dimensione
- 1.5–3
At 60 to 100 cm deep, a weak layer of surface hoar is at prime depth for rider triggers to produce large avalanches. It can be most likely triggered on steep roll-overs in wind-sheltered terrain around treeline.