Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 3
The snowpack is complex, with weak, sugary faceted snow from January sitting underneath multiple feet of denser snow from the past few weeks. Strong snow over weak snow is a classic setup for avalanches. Obvious red flags like collapsing and cracking may be absent, and you may even get a few sets of tracks on the slope before finding the right trigger spot, often a shallower part of the slab near rocks or bushes. These avalanches have the potential to be large and destructive.
While not widespread, this problem is impossible to navigate. The only way to deal with a persistent weak layer is to avoid it - steep and rocky slopes with shallow snow on the north half of the compass are off limits for now.
The slide on Duchesne Ridge produced SUV-size chunks of debris, which stacked up deep in the runout and in the trees below. Getting caught in a dangerous slide like this could be game over -- Trees turn into baseball bats, and debris chunks are like boulders coming down on you.