Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 2
The January dry spell left a widespread persistent weak layer (PWL) of faceted snow northerly-facing slopes at the mid and upper elevations, including upper-elevation slopes facing west and east, and this layer is now buried underneath the 6-14 inches of snow from this past Wednesday. This PWL is evident in the gray stripe shown in the photo below from Kaufman near Monte Cristo on Friday . Watch UAC Director Paige Pagnucco's video under Additional Info (below) on how this PWL has developed.
Wind-loaded slopes are the most likely to avalanche on this PWL where the wind has created a stronger slab above this buried PWL.
This PWL structure will create dangerous avalanche conditions with heavy snowfall and strong winds beginning later today and lasting through much of this week.