Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 2
Faceted weak layers continue to persist in the snowpack from faceted crusts to basal facets closer to the ground. In shallower snowpacks (less than 2 m) these weak layers have been slow to heal and strengthen. Wind drifted and loaded slopes near and above treeline on North through East will be most suspect and where avalanches will be bigger. Below treeline, the snowpack continues to be weak and shallow with settling stiffening slabs resting over facets and depth hoar. Triggering an avalanche at this elevation band would still have high consequences if it swept you over a cliff or into a terrain trap.
Avoid likely trigger points, near rock outcrops, steep convex rolls and on the margins of the slab. Obvious signs of instability like shooting cracks and loud audible collapses may not be present in travels and lure you into steeper terrain. Using a probe pole to feel for strong over weak layering or taking the time to dig down into the snowpack is a great way to assess if this poor snowpack structure exists. Any persistent slab avalanche would be large and dangerous potentially taking with it most of the season's snowpack. Giving avalanche paths wide berths and avoiding be on or connected to slopes over 35 degrees is a great way to stay safe.
Stronger slabs from previous storms rest on top of faceted weak layers that continue to persist deeper down in the snowpack.