Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
The mindset for today should be "Do I have slab on the surface?" These slabs would be found at upper elevations on the leeward side of ridgelines and cross-loaded terrain features. These newly formed slabs rest on top of a very weak and shallow snowpack that will make a great weak layer to fail on. Watch for wind-drifted pillows or a stiffening of the snow underfoot, paying attention to obvious signs of instability like shooting cracks and loud audible collapses. If you do trigger an avalanche, it's possible that it could fail on or near the ground, leading to a nasty ride or potentially being buried.
New snow and wind yesterday on Thursday were creating sensitive slabs on the surface on the leeward sides of ridgelines. Winds are expected to pick up today and should easily drift low-density snow into more cohesive slabs.
Pay attention to obvious signs of instability like shooting cracks and loud audible collapses as these are indications you've found unstable snow.
Photo: Andy Bond 1/4/24