Wind Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Likely
- Size
- 2
Fresh snow and strong winds blowing from the west-northwest are creating sensitive, soft slabs at mid and upper-elevations. Slopes facing NE-E-S will be the most likely places to trigger fresh drifts, but look for and avoid any cross-loaded terrain features. Yesterday, strong winds blowing from the south created stiff drifts that are now buried and hidden beneath today's fresh snow. These booby-trap slabs are most likely to exist on upper elevation slopes facing NW-N-E and may be triggered further down slope and break above you.
Backcountry observers noted surface hoar and near-surface facets formed above a crust on north-facing aspects. This may lead to sensitive conditions, with avalanches that break wider-than-expected, and the potential to be triggered from a distance.
Any avalanche triggered on mid and upper elevation terrain has the potential to step down to a persistent weak layer, resulting in a very large, deadly, hard-slab avalanche.
Strong ridgetop winds yesterday in the upper White Pine drainage. Photo: Kelly