Avalanche Forecast

We think that it’s still possible to trigger a 1-3 ft storm slab on steep slopes above treeline, but it is becoming unlikely near treeline where temperatures were warmer during the storm. The storm snow is gaining strength, but this major recent storm event should give us pause before giving bigger terrain the green light: If you do trigger an avalanche, it’s unlikely to be small. Steer around large, steep, unsupported, rocky, slopes at upper elevations. When in doubt, default to lower-angled terrain. Avalanches are unlikely below treeline where recent wet heavy snow has become firm and frozen with cooling temperatures.

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.