Wind effect is still driving the avalanche danger in many areas. The safest, and best, riding may be in lower elevation terrain sheltered from the wind.
Weather Forecast
Friday: Dry and mostly sunny. Treeline temperatures around -20C. Ridgetop winds 20-30 km/h from the southwest.Saturday: Dry with cloud building in the afternoon. Temperatures around -15 C. Winds 30-40 km/h from the south.Sunday: Flurries. Temperatures around -8C. Winds 30-40 from the southwest.
Avalanche Summary
On Wednesday, a snowmobiler triggered a wind slab avalanche on a southeast aspect at around 2100 m. Several naturally triggered wind slabs to size 2 were noted in exposed terrain on Monday, Tuesday and Wednesday. I anticipate ongoing wind slab problems for the rest of this week and into the weekend. In shallow areas like Clemina Creek, it could be possible to trigger a layer of facets buried around 60 cm below the surface.
Snowpack Summary
Recent new snow has been shifted first by southwesterly winds and then by northerly winds. As a result, wind slabs exist on a variety of aspects at upper elevations. These accumulations have covered old, thicker wind slabs from previous wind events. A layer of faceted "sugar snow" and spotty surface hoar which formed during December's cold snap now lies roughly 1 metre below the surface. This layer is now dormant in many areas, but may still be a concern in shallow snowpack parts of the region, particularly around Clemina Creek. I'd continue to investigate this layer before committing to any large, unsupported features. The lower snowpack seems to be generally strong and well settled.
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.