Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely
- Size
- 1.5–2.5
Weak snow that formed in November is buried 2-5 feet below the surface in most shady terrain above 8,000’. It is unlikely you will impact these deep layers in most terrain, but it is not out of the question. Watch for thin spots in the snowpack where you are more likely to trigger an avalanche. Thin spots often hide around slope convexities, rocky areas, and the margins of wind affected terrain. Avalanches involving old snow from November will be large and show no warning signs before triggering. Travel one at a time, keep an eye on each other, and avoid very steep, shady slopes.