Persistent Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1.5–2.5
You can trigger a large avalanche that breaks on crusts and weak layers buried up to four feet deep. The most dangerous slopes are easterly-facing. Avoid these slopes, especially below steep ridgelines, convex rollovers, and gully features. You may not get any signs of unstable snow before you trigger a large and dangerous avalanche. If you notice weak layers within the upper snowpack, you should move to terrain less than about 30 degrees as a safer option.