Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 3
The most recent storm dropped 8 inches of snow and 1.2” of water on Sunday and Monday. We refer to this as incremental loading of our snowpack. It is not a big sudden load that will bring the house down, but it is enough of a load to keep the danger elevated. Backcountry observers continue to experience cracking and collapsing on Northerly aspects. The suspect weak layer is buried about 2 feet below the snow surface, and is easily observed in snow pits.
This instability is not limited to Northerly aspects. Southerly aspects have poor snowpack structure, and we are still seeing poor results in stability tests. You may not experience collapsing on these slopes, but it remains possible for riders to trigger avalanches up to two feet deep.
The strategic mind-set for now, is entrenchment. We are dealing with a well-established persistent weak layer and it simply needs more time to stabilize. Dealing with a weakness like this requires patience and the strategy remains avoiding slopes that are steeper than 30 degrees.
The weak layer is easily observed roughly 2 feet down.