Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 2
A persistent weak layer - or 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 inform us that the slopes that are most prone to slide are recently wind-loaded and have a slab of stronger snow on top of the buried PWL.
I am unsure if today's increase in southwest wind will be able to drift snow onto lee slopes. Therefore, be on the lookout for new wind drifting today. Any slope loaded by the wind will be more susceptible to an avalanche.