Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
You can trigger an avalanche where you find recently wind-drifted snow near and above treeline. Slopes that face northwest to north through east are the most dangerous. Watch for slopes that have a lens-shaped or pillowy appearance. These conditions can be found just below treelines and in cross-loaded gullies. If you find more than 10 inches of new snow forming a stiff slab or experiencing cracking or collapsing in the new snow, retreat to lower-angled and wind-sheltered slopes.