Avalanches are possible at upper elevations where wind slabs are forming.
Recent snow is stabilizing quickly in most areas, however cold windy weather will likely leave unstable wind slabs at upper elevations, especially along ridgetops.
TUESDAY NIGHT: Clear skies, light wind from the west, treeline temperatures around -18 C.
WEDNESDAY: Increasing cloud with some light snow starting in the evening, moderate to strong wind from the southwest, treeline temperatures warming to -10 C.
THURSDAY: Moderate snowfall with 20-30 cm around Pine Pass and Torpy, 10-15 cm around McBride and Kakwa, and 5-10 cm along the eastern slopes, strong wind from the southwest, treeline temperatures warming to -3 with freezing level reaching 1300 m.
FRIDAY: Mostly cloudy, strong wind from the west, treeline temperatures around -2 C with freezing level reaching 1400 m.
Monday's storm resulted in a natural avalanche cycle. There were numerous reports of size 1-2 storm slabs in the top 20-50 cm of new snow above 1500 m and some large size 2-3 wet loose avalanches below 1500 m.
Cold windy weather will blow snow into unstable slabs in lee terrain. Above 1500 m you can find 20-40 cm of settling storm snow while lower elevations will likely have crusts on the surface. The storm snow has been rapidly settling, but could potentially be slower to bond to isolated surface hoar layers in some sheltered areas, and/or thin breakable crusts below 1700 m.
A layer of faceted snow can likely be found down around 60-120 cm from the cold period at the end of December, but it has not been reactive recently and does not seem to be creating an avalanche problem in most of the region.
The early-December crust/facet interface can typically be found down around 1 m, but has been dormant and is no longer expected to be creating an avalanche problem in the region. The base of the snowpack is composed of crusts and weak faceted grains, particularly in thin snowpack areas east of the divide.
