Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
You could trigger an avalanche where cohesive slabs of snow sit over weaker snow on slopes steeper than about 35 degrees. Avoid common trigger points, such as convex rollovers, rocky outcrops, or the edges of slopes where the margins of a slab are the thinnest.
Modest snowfall with wind will not be enough to increase the avalanche danger but will drift snow onto northwest to north through south slopes. You can trigger a small avalanche on slopes with shallow wind-drifted slabs. Wind-drifted snow often feels stiff or has a wave or pillow-like appearance. New snow may also increase the size or reactivity of loose avalanches below treeline.