Persistent Slabs
- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Possible
- Tamaño
- 2–3
The weak layers in our snowpack have started to gain strength and adjust to the new snow load in many locations. Unfortunately, the process of the Dec. 11 persistent weak layer improving and gaining strength is not the same at all locations. While some areas are pointing to improving stability, others are showing active whumpfing and unstable snowpack test results. 2 large natural avalanches were reported that are thought to have occurred during the storm on Monday and potentially failed on the Dec. 11 PWL. Many areas throughout the forecast region at mid to high elevations are developing deeper and stronger snowpacks. Locations at lower elevations and in some parts of the southern forecast area have shallower and weaker snowpacks. These areas that are still shallow with a well developed Dec. 11 weak layer remain the greatest concern. This will make it more important to collect snowpack information from your specific area and to look for signs of instabilities.
Could a large persistent slab avalanche still occur? Yes. Are conditions going to continue to improve over the days ahead? Yes. Conservative terrain choices are still recommended while traveling in the backcountry until this weak layer becomes unreactive. Due to the large size, potential remote triggering, and unpredictable nature of persistent slabs, limiting exposure to this avalanche problem is warranted.
