Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1.5–2.5
Persistent slab avalanches can be very large and potentially break widely across terrain features. While avalanches may be harder to trigger on Tuesday, given the high-consequence nature of this problem, it's best to avoid large, open, steep terrain. Wind-loaded slopes with stiff, textured drifts remain the most likely location for this problem. But it's worth treating most steep slopes with suspicion. Keep your distance from these features and stay well clear of cornices, which could fail, potentially triggering large avalanches on the slopes below.
Many of these avalanches occurred on southern aspects, and warming could have contributed to the increased avalanche activity. We expect cloud cover to help reduce activity on steep, sunny aspects, but light rain or wet snow could produce avalanches in more sheltered terrain. Given the high consequences, it's worth staying diligently conservative and choosing smaller terrain with lower slope angles.
(2/28/2026)
A widely propagating natural avalanche below Cutthroat Peak. This avalanche is suspected to have failed on weak snow over the 2/7 crust. 7000ft, S-SW aspectN-R4-D2.5-O
Photo: NCH