Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2
A persistent weak layer of sugary, faceted snow sits beneath a slab 1'-2' thick. This problem is most pronounced on slopes facing NW-N-NE-E near treeline and below and the weak layer is easy to locate with your shovel. At the middle and lower elevation bands, backcountry observers continue to report failures in stability tests, collapsing, and shooting cracks. Above treeline the weak layer distribution is much more variable and it is hard to track. Attempting to outsmart this avalanche problem in the alpine is a dangerous proposition. By mid March skiers and riders start to think about big objectives and skiing the high peaks, but now is not the time. There is a reason we call this type of weak layer persistent, and patience is the name of the game for now. Low angle slopes remain your best bet for skiing today.