Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible
- Size
- 1–2
Weak snow in the lower half of the snowpack exists in the majority of mid and upper elevation terrain. Slabs up to 3 feet thick rest on that weak snow and can be triggered in areas that developed wind slabs several days ago. Slabs 1-2 feet thick in the mid elevations also sit on weak snow and can be triggered primarily in terrain on the north half of the compass. In the lower elevations avalanches are unlikely except in isolated pockets that harbor old weak snow below the surface.
Recent avalanches, cracking and collapsing are obvious signs of unstable snow. These signs may or may not present themselves prior to triggering an avalanche today. Remote triggers continue to be observed. Hard slabs in the upper elevations could support significant weight prior to releasing. These slabs can break above a person, making escape difficult.
Warm overnight temperatures that will continue to rise throughout the day will increase the likelihood of triggering, especially in terrain receiving direct sunlight. Small wet loose avalanches are possible today and will generally not be large enough to result in injury or burial.
The best approach today is to be vigilant with safe travel practices. Travel one at a time, avoid steep rollovers, and utilize islands of safety when stopping.