Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 2
A persistent weak layer (PWL) of faceted snow exists on northerly-facing slopes at the mid and upper-level elevations where it is possible to trigger an avalanche up to 1-2 feet deep and over 100 feet wide. Avalanche activity and field work this week has informed us that the slopes that are most prone to slide are recently wind-loaded and/or have a slab of stronger snow on top of the buried PWL. Even though the video below is from Big Cottonwood, it demonstrates the setup where you would most likely trigger an avalanche (see video).
Video: Greg Gagne