Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
You can trigger an avalanche on steep slopes where you find either new snow or wind-drifted snow forming a cohesive slab. The most dangerous slopes face north through east, near and above treeline. If you see cracking or collapsing as you travel over the new snow, avoid slopes steeper than about 30 degrees. Watch for snow blowing onto leeward slopes and avoid areas of drifted snow below ridges and on convex rollovers. You should prepare for avalanche danger to increase throughout the day on Wednesday.