Avalanche Forecast

On Thursday the fresh snow was reactive to skiers, with sluffing, natural storm slab avalanches to size 2.5, and wind slabs to size 1.5 reactive to skiers. With more snow in the forecast, expect the snowpack to continue to be reactive to skier- and rider-traffic.

On Wednesday, skiers triggered a large, size 2 avalanche near Ningunsaw. The Deep Persistent avalanche was triggered on an east aspect near ridgetop in a thin, rocky start zone and failed on basal facets.

On Wednesday and Thursday morning, avalanche control operators reported natural and explosive-triggered wind and storm slab avalanches up to size 3, likely occurring with the recent heavy snowfall.

Evidence of a widespread natural avalanche cycle was observed throughout the region on Monday and Tuesday, with storm slabs and wind slabs observed to an impressive size 3 (very large). Many slabs started off dry but finished running as wet loose slides at the bottom of their runouts.

40-70 cm recent storm snow covered older wind-affected surfaces and a supportive melt-freeze crust up to 1800 m and steep solar slopes. South-southwesterly winds have been creating wind-affected surfaces and wind slabs of varying age and reactivity on an ongoing basis.

Recent and forecast storm snow will form only the uppermost portion of 100-150 cm of February storm snow settling over a layer of facets, crust, and previous wind-affected surfaces in alpine terrain. We're continuing to track this layer given recent avalanches on this interface under the patterns of continuous loading and successive natural avalanche cycles.

The mid and lower snowpack continues to bond and stabilize while a number of buried weak layers are still being tracked by professionals in the region, having produced a few large avalanches in the not-too-distant past.

Friday night

Light flurries, 5 cm overnight. Southwest winds increasing to 30-40 km/hr. Treeline low temperature -9 C with freezing level dropping to valley bottom.

Saturday

Mostly cloudy with isolated flurries, 5-10 cm. Southwest winds gusting 50-70 km/hr. Treeline high temperature -5 C.

Heavy snow starting late Saturday, 15-30 cm by Sunday afternoon. Southwest wind gusting to 80 km/hr with the storm. Treeline high temperature -2 C. Freezing level rising above 1000 m.

Snow tapering early morning, 25-50 cm storm totals forecast. Southwest winds 40-60 km/hr. Treeline high temperature -5 C./hr. Treeline high temperature -2 C.

More details can be found in the Mountain Weather Forecast.

• Don't let the desire for deep powder pull you into high consequence terrain.
• Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
• Use conservative route selection. Choose simple, low-angle, well-supported terrain with no overhead hazard.