Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1.5–2.5
Recent snow and strong winds have built cohesive slabs on top of a variety of weak facet layers and depth hoar that formed during multiple long drought periods. These slabs are at least a foot deep in many places especially near and above treeline. The most likely weak layer these avalanches will fail on formed during the february dry period before Valentines Day and are 1 to 2 feet below the surface. With a shallow and weak snowpack, even a peristent slab avalanche has the possibility of stepping down into deeper weak layers close to the ground. It's possible to trigger an avalanche from the flats below or a distance away.
Stiffer slabs have formed on top of weak faceted layers and depth hoar. The most concerning layer formed during the dry period to start February. Depth hoar and other faceted layers exist closer the ground.
(2/18/2026) Photo: Andy Bond