Wind Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 1–2
Snow and winds have built slabs 2-3 feet thick on all aspects at upper elevations, and west through north through southeast aspects at middle elevations. Watch for signs of wind-affected snow such as pillows, drifting, and textured surfaces. You are most likely to encounter wind slabs around ridgelines, rocky areas, and cross-loaded terrain (gullies and roadcuts). Cracking and collapsing are sure signs of unstable snow. Traveling in sheltered terrain will help you stay away from this problem.
As clouds clear in the afternoon allowing the sun to come out, watch for signs of warming snow. Roller balls, pinwheels, and changing surface conditions are all good indicators that the snow surface is heating up. Small wet loose avalanches on steep southerly aspects may be possible if the sun comes out long enough. Heating snow will also increase the sensitivity of other avalanche problems. Sticking to higher elevations and shadier aspects will help you find cold snow.
(3/6/2024)
Small cornice triggered windslab at 10,000 feet
Photo: Travis Baldwin