Persistent Slabs
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Unlikely
- Taille
- 4
A persistent weak layer of of sugary, faceted snow exists at the base of the snow pack and a dense slab 3'-6' thick is sitting on top. Time, warmer temperatures, and compression from the load are helping to heal this weak layer, and snow pits and stability tests performed by myself and local observers indicate that it has either gained strength, or has moved into a state of dormancy. Generally speaking, the deeper the snowpack, the stronger it is. This weak layer still remains a concern in areas where the snowpack is thin, and therefore much more easily affected by the weight of a skier or rider.
Photo illustrates strong slab over weak, October facets. Extended column tests produced no results and it's becoming harder for the weight of a skier or rider to affect this basal weak layer. Shallower snowpack areas are likely trigger points.