Strong winds and fresh flurries will build reactive deposits around ridges and lee features.
If more than 20 cm of new snow accumulates, expect a more widespread slab avalanche problem.
Strong winds will impact new flurries and loose snow, building deeper and more reactive slabs in lee features. Be mindful of snowfall accumlating through Sunday, a more widespread storm slab problem may come into play by day's end.
A crust/facet layer formed in mid-November exists deep in the snowpack. This layer may remain reactive at higher elevations, where an overlying, supportive crust is absent or weaker compared to lower elevations.
No new avalanches were reported in the region since Monday.
On Friday, in the adjacent Sea to Sky forecast region, explosives triggered size 1-2 storm slab avalanches, failing either within the storm snow or on a crust. The few size 2 avalanches were triggered in steep, wind-loaded lee features.
Last Monday, several large (size 2.5 to 3) natural avalanches occurred along the Duffey corridor. These all failed on the mid-November crust and facet layer.
Strong southerly winds are impacting flurries and modifying snow surfaces.
Over the last week, 30 to 50 cm of storm snow accumulated, accompanied by strong alpine winds. This covers a melt-freeze crust that becomes increasingly supportive above 1700 m.
A deeper crust with associated facets, formed in mid-November, exists 50 to 150 cm below the surface and has been responsible for recent large avalanche activity.
Saturday night
Mostly cloudy. Trace to 5 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.
Sunday
Mostly cloudy. 15 to 20 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -4 °C.
Monday
Cloudy. 15 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -6 °C.
Tuesday
Mostly cloudy. 10 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -6 °C.
More details can be found in the Mountain Weather Forecast.
