Persistent Slabs
- Hochgebirge
- Waldgrenze
- Unterhalb der Waldgrenze
- Wahrscheinlichkeit
- Likely
- Größe
- 3
There are numerous indications why the persistent weak layer down near the ground remains a significant avalanche concern. This includes continued reports of collapsing as well as yesterday's remotely-triggered slide on Patsy Marley in upper Little Cottonwood.
This weak snow is down near the ground, buried underneath 2-3' of a strong slab of snow from the Thanksgiving storm cycle. This poor snow structure can be found at the mid and upper elevations, on aspects facing northwest, through north, and east. Although there are numerous reports of this structure in the Salt Lake mountains, a very similar structure can be expected on these same aspects at the mid and upper elevations in the Provo mountains.
The photo below (C. Hughes) depicts this dangerous structure of strong snow over weak snow:
The video below (link) further illustrates our primary avalanche problem.
It will take patience while allowing time for this layer to heal, and this layer may become increasingly active later this weekend with an additional load of snow and wind. Remember, existing tracks on a slope are zero indication of stability. For now, I am avoiding all steep northerly aspects.