At danger level 2-moderate: Keep distance to each other and to release areas. NB, remote triggering is possible.
At danger level 3-considerable: Avoid steep terrain (more than 30 degrees) and in runout zones. NB, remote triggering is likely.
Make very conservative route choices, especially in unknown terrain, after snowfall and if temperatures rise.
Identifying areas where the weak layer is present might be difficult and requires experience.
Danger signs are whoumpf-sounds, cracking and recent avalanches. However, absence of signs does not mean it is safe.
The avalanche problem is related to the presence of persistent weak layers in the old snowpack.
These weak layers form in cold weather and typically include buried surface hoar, depth hoar or faceted crystals
Mostly human triggered avalanches; natural avalanches are rare, mainly in combination with other avalanche problems
Avalanches can become very large
Avalanche releases when loading exceeds the strength of the weak layer. This can happen due to:
The weak layer can be found anywhere in the old snowpack, often deep inside the snowpack. When deeply buried, however, triggering becomes less likely, but the avalanches will become bigger.
Possible weak layers: