Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2–2.5
New snow and strong winds will continue to build slabs that rest on top of a variety of weak facet layers and depth hoar that formed during multiple long drought periods. The added stress of more weight may be enough to tip the scales on some slopes that are loading rapidly from strong winds. These slabs could be 2 to 3 feet thick at upper elevations on northerly and east aspects. The most likely weak layer these avalanches will fail on formed during the February dry period before Valentines Day. 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