Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpin
- Limite forestière
- Sous la limite forestière
- Probabilité
- Possible
- Taille
- 1–2
You could trigger avalanches on slopes with one to four feet thick slabs that rest over old, weak snow. The most dangerous slopes face northerly and easterly near and above treeline. A relatively small avalanche could break on one of the multiple weak layers in the middle of the snowpack, but avalanches could become larger and more dangerous if slides step down into the weak layers near the ground. Shooting cracks and collapsing are signs of instability, but they may not be present before you trigger a large avalanche.