Reactive wind slabs exist on all aspects at treeline and above.
Whumpfing, shooting cracks and avalanches are indicators of unstable conditions.
Gusty winds are impacting any loose snow, variable winds may have reverse-loaded features. Watch for reactive deposits around ridges or lee features.
Some helpful MIN reports from the Shames area describe numerous natural and skier triggered slab avalanches up to size 2. These were on southwest slopes at treeline. The early December crust buried 20 to 50 cm down is a suspect weak interface.
Reactive wind slabs may persist through Sunday.
Recent strong winds have varied in direction, building reactive wind slabs on all aspects at upper elevations. In some areas surface hoar and/or facets are buried 10 to 20 cm below the surface snow. 30 to 50 cm of wind-affected snow rests on a thick rain crust. Reports from the Shames area have noted cracking and whumpfing in the upper snowpack which indicates that they layers require further investigation.
Treeline snow depth range from 200-280 cm. The lower snowpack has no layers of concern.
Saturday night
Cloudy, with flurries 5 to 10 cm. 25 to 55 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing levels 1000 m.
Sunday
Snow 5 to 15 cm. 35 to 70 km/h southeast ridgetop wind. Treeline temperature -3 °C. Freezing levels 700 m.
Monday
Snow 5 to 10 cm. 15 gusting to 65 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.
Tuesday
Snow 10 to 20 cm. 10 gusting to 80 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 800 m.
More details can be found in the Mountain Weather Forecast.
