Regions
Northwest Inland.
Watch for wind slabs forming on the downwind side of ridges and terrain breaks in exposed areas.
Confidence
Moderate - Due to the number of field observations
Weather Forecast
Friday: Dry and sunny. Winds moderate from the northeast. Treeline temperatures around -20C.Saturday: Dry and sunny. Winds moderate from the east. Treeline temperatures around -22C.Sunday: Dry with some sun and cloud. Winds moderate from the southeast. Treeline temperatures around -23C.
Avalanche Summary
No recent avalanches observed. If you're out in the mountains and see recent avalanches please snap a photo and submit your information to the Mountain Information Network.
Snowpack Summary
Relatively light recent snow amounts have been accompanied by westerly and northwesterly winds. 20-ish cm below the surface, a highly variable weak layer exists. It comprises of facets in cold areas, crusts on solar aspects, and in protected areas below 1500m, feathery surface hoar. In most places, insufficient snow has fallen above this layer for it to be reactive, but it should be considered in deep snow areas, or where the wind has blown additional snow over the top of it.Two crusts, which formed near the end of November, are found approximately 30 to 50cm below the surface. These crusts are widespread and extend into the alpine. Previous snowpack tests produced hard results on these crusts, but we have not seen any recent information about their sensitivity to triggering. Below these crusts, a well settled mid-pack overlies the late October crust which is down near the ground. The October crust is widespread and has not been reactive to human triggering since the end of November. Average snowpack depths in the region are between 80 and 140cm at treeline.
Problems
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.