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RegisterMar 1st, 2022–Mar 2nd, 2022
Purcells.
Human triggering of storm slabs should remain on your radar, especially in the southwestern part of the region where we have seen the greatest snowfall amounts.
Steep wind loaded lee features at upper elevations pose the greatest risk.
Tuesday night: Light snowfall 0-5 cm, moderate to strong southwest wind, freezing levels dropping to valley bottoms for most of the region with treeline lows of -3.
Wednesday: Light flurries, 0-5 cm, light to moderate southwest wind, treeline high around +2.
Wednesday night into Thursday: 5-10 cm, variable wind, treeline highs around zero.
Friday: Partly cloudy, no new snow, light northeast wind, treeline highs around -3.
On Tuesday a natural avalanche cycle in the size 2 range was observed in the southwest of the region. Also on Tuesday there were some small (size 1) skier-controlled wind and storm slabs reported. On Monday in the northern Purcells there was a skier controlled size 1.5 wind slab on a north-facing cross-loaded feature. There were also some small rider controlled wind and storm slabs reported elsewhere in the region.
Snowfall amounts have varied substantially throughout the region with the southwest side of the Purcells getting the greatest snowfall amounts. Recent storm snow (10-40 cm) overlies a variety of old surfaces such as firm wind-pressed snow, sun crust on solar aspects, surface hoar, and potential cold weak crystals on shaded aspects.
An interface from mid-February is likely now down 40-60 cm. This layer was previously only reactive in wind-loaded terrain where a slab had formed but may become more problematic if covered with a more widespread cohesive slab.
Below that on sheltered north aspects, there is still a surface hoar layer being tracked that was formed in late January. Though there haven't been reports of recent avalanches on this layer in this region, it is still on the radar of many operations.