Persistent Slabs
- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Possible
- Tamaño
- 2
Last week's heavy snow created a cohesive and harder slab on widespread preexisting layers of very weak faceted snow. In some areas, the overload of heavy new snow was just enough to activate these layers and cause dangerous slab avalanches. More snow fell and drifting occurred earlier this week, which continued to load slopes with poor snow structure. On slopes facing the north half of the compass in some areas, people could trigger soft slab avalanches failing on a buried persistent weak layer. Although becoming less frequent, observers in the Logan Zone this week reported signs of instability in some areas, including audible collapsing and cracking.
- Avalanches could be triggered remotely or from a distance.
Very weak faceted snow is buried and preserved in many areas. Poor snow structure exists where a slab of harder snow sits above these buried layers of loose faceted snow, and in some areas, stability tests show unstable conditions.