Purcells

Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.

Moderate

• Uncertainty is due to the limited number of field observations.

On Friday, an explosive triggered size 1.5 persistent slab avalanche was reported on a northerly aspect at treeline. The slab failed on a crust down 80 to 110 cm.

Several skier triggered wind slab avalanches up to size 1.5 were also reported on northerly aspects at treeline.

30-50 cm of recent snow and strong southwest winds have formed slabs that will be most reactive in wind affected terrain. This recent snow overlies a 3 to 5 cm thick crust below 2200 m.

90 to 140 cm down is a weak layer of faceted snow at higher elevations or surface hoar in sheltered terrain.

100 to 180 cm down is a prominent crust which may have facets above or below.

Depth hoar(large facets) can be found at the bottom of the snowpack.

Saturday Night
Mostly cloudy with isolated flurries. 3 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level valley bottom.

Sunday
Mostly cloudy. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level valley bottom.
Monday
Mix of sun and clouds. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level valley bottom.

Tuesday
Mix of sun and clouds. 35 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

• Make conservative terrain choices and avoid overhead hazard.
• Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
• Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.
• If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.