Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
Dangerous avalanche conditions exist near and above treeline where you find a cohesive slab resting on old, weak snow. You are most likely to encounter this dangerous combination on northwest through north to east facing slopes at higher elevations. If you see cracking or experience collapsing in the snowpack you should stay on slopes less than about 30 degrees steep. Safer travel options exist on wind-sheltered slopes below treeline and on south-facing slopes.