Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
You can trigger avalanches in recently drifted snow that are resting on buried weak layers. Look for and avoid smooth, rounded pillows of snow just below ridgelines and in cross-loaded terrain features like gullies. Easterly-facing slopes are the most dangerous but cross-loaded slopes that face north or south are also suspect. As the slabs above these weak layers continue to grow and connect they could be triggered from below or a distance. Cracking in the new snow and audible collapses are obvious signs of instability, avoid steep slopes where you see these signs. You can find safer travel on lower-angle slopes and in areas sheltered from the wind.