Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Very Likely
- Size
- 2
The past few days of field work confirmed our suspicions... we've got a buried and preserved layer of weak, faceted snow and it's reactive to our snowpit tests and more importantly, to our additional weight. And that was all before Thursday's storm! So, here's the setup. The current snowpack structure mirrors an upside-down cake... think, stronger snow on weaker snow. This type of layering leads to tricky avalanche conditions, where we can trigger slides from a distance or from adjacent slopes, and where we can pull the entire log pile down on top of us. And once triggered, today's avalanches may break wider and deeper than you might expect.
But you don't have to ride blind... so, look for and listen to signs of unstable snow like whoomping sounds and sudden collapses of the snowpack or shooting cracks in front of your skis, board, or sled. And of course the biggest clue of all... recent avalanches, especially on the same types of slopes you wanna ride on.