Persistent Slabs
- Alta quota
- Limite del bosco
- Sotto il limite del bosco
- Probabilità
- Likely
- Dimensione
- 2
The November snow in upper elevation avalanche starting zones before the weekend storm is extremely weak and sugary due to its shallowness and sustained cold temperatures. Heavy snow and drifting from last weekend’s storm overloaded this weak faceted snow (now a persistent weak layer), and several large avalanches up to 3 feet deep and 150 feet wide occurred in the last few days.
- Avalanches failing on a persistent weak layer could be triggered remotely, from a distance, or below.
- Cracking and collapsing (or whumpfs) are definite signs of instability.