South Columbia

Fair - Intensity of incoming weather systems is uncertain on Sunday

Saturday:Mainly dry with broken skies, winds moderate to strong from the northwest and alpine temperatures -7.Sunday:Another series of weather systems starts to affect the interior. Light snowfall, alpine temperatures -9, winds light to moderate from the northwest.Monday: Light snowfall, alpine temperatures -8, winds light west.

A few avalanches to size 1.5 have been reported in the last 2 days. These are isolated to the most recent storm snow.

Moderate to strong west and southwesterly winds have built new wind slabs in alpine and treeline lees. 20-40 cm of new snow sits on a weak layer consisting of surface hoar crystals, stellar crystals and/or crust. Around 60-80 cm below the snow surface, the early December surface hoar, facetted snow, and/or a crust interface sits and has been reportedly more stubborn to rider triggers. The late-November persistent weak layer consists of a sun crust on steep south facing slopes and surface hoar in sheltered areas. It is now buried 70-90cm below the surface. Snowpack tests vary on this interface with some results producing "sudden" shears and others producing no results. This interface is generally considered to be dormant. However, professional operators are keeping a close eye on it.A weak layer of facets sitting on a crust that formed in October, sits near the base of the snowpack. This layer is predominantly found on north-facing alpine slopes with smooth ground cover. Triggering this weakness is unlikely, however if triggered the resulting avalanche would potentially be a large event with high consequences.