Deep Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 2–3
The recent new snow has increased the load on deeply buried weak layers of faceted snow. These weak layers will be struggling to adjust to that load and snow creep that will be occurring on steep slopes as temperatures increase. Deep hard slab avalanches with depths to five feet could still be triggered by humans. These low probability/high consequence avalanches are more likely to be triggered where faceted snow from December resides less than three feet below the snow surface. Large triggers, such as snowmobiles or cornice failures, are more likely to trigger one of these dangerous hard slab avalanches.