Persistent Slabs
- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Possible
- Dimensione
- 3
There are two buried persistent weak layers (PWL) in the snowpack:
1. The upper layer buried down 12-24 inches formed during cold, clear weather in late January and has been buried by recent storms and wind-drifted snow.
2. The lower layer, near the ground, formed in December and has caused large avalanches, including two fatalities during the Holiday Avalanche Cycle.. This layer is most problematic in steep rocky terrain or on repeater slopes that previously avalanched this winter (see recent avalanche activity photo).