Avalanche Forecast

Up to 3 ft or more of recent low-density storm snow is sitting on a hard crust layer. In some areas, buried surface hoar or faceted crystals above the crust are making for very poor bonding. Expected new storm snow falling with increasing winds and warming temperatures should be enough to tip the balance in some areas, especially steep terrain being loaded with wind transported snow. This is a time to dial back and choose conservative terrain. Storm slabs can be avoided by sticking to low angle supported slopes. Cracking or whumphing of the snow is a valuable warning sign that anticipated problems are in your terrain.

Release of a soft cohesive layer (a slab) of new snow that breaks within the storm snow or on the old snow surface. Storm-slab problems typically last between a few hours and few days. Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

You can reduce your risk from Storm Slabs by waiting a day or two after a storm before venturing into steep terrain. Storm slabs are most dangerous on slopes with terrain traps, such as timber, gullies, over cliffs, or terrain features that make it difficult for a rider to escape off the side.

Storm slabs usually stabilize within a few days, and release at or below the trigger point. They exist throughout the terrain, and can be avoided by waiting for the storm snow to stabilize.