Avalanche Forecast
Regions: Badshot-Battle, Central Selkirk, Goat, Gold, Jordan, Kokanee, North Columbia, North Selkirk, Retallack, South Columbia, Valhalla, West Purcell, Whatshan.
Stick to conservative terrain, as riders can trigger dangerous avalanches on all aspects and elevations.
Confidence
High
Avalanche Summary
On Wednesday reports of human trigger and natural avalanche activity continued and released on weak layers described in the Snowpack Summary. They ranged from 40 to 100 cm deep, occurring on all aspects and elevations.
On Tuesday, multiple wind slab and persistent slab avalanches were reported, some remotely triggered.
It remains possible for humans to trigger similar avalanches going forward. Read more about this problem here.
Snowpack Summary
Around 40 to 60 cm of snow accumulated last week and is beginning to facet and develop surface hoar in protected areas. Recent easterly wind in the alpine and northerly wind near valley bottom redistributed this snow in wind-exposed terrain. The snow remains soft in wind-sheltered terrain with a lack of slab properties. The snow overlies various layers that it may not bond well to, including faceted grains, surface hoar crystals and a hard melt-freeze crust on sun-exposed slopes.
The middle portion of the snowpack between approximately 50 and 100 cm deep is faceted with numerous other layers of surface hoar and/or crusts that formed over the month of January.
The lower snowpack is well settled and strong.
Weather Summary
Thursday Night
Clear skies. 10 to 15 km/h east ridgetop wind. Treeline temperature -18 °C.
Friday
Sunny. 10 to 20 km/h west ridgetop wind. Treeline temperature -16 °C.
Saturday
Partly cloudy isolated flurries. 1 to 3 cm. 30 to 40 km/h northwest ridgetop wind. Treeline temperature -14 °C.
Sunday
Partly cloudy. 30 to 40 km/h northwest ridgetop wind. Treeline temperature -18 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- It's a good day to make conservative terrain choices.
- Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
- Remote triggering is a big concern, be aware of the potential for wide propagations and large, destructive avalanches at all elevations.
Avalanche Problems
Persistent Slabs
40 to 60 cm of snow rests on a weak layer. Humans could trigger large avalanches anywhere the overlying snow has formed a cohesive slab on these layers. Recent reactivity has been specific to areas that are south aspect and steep.
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Possible - Likely
Expected Size: 1.5 - 2.5
Wind Slabs
Wind has shifted directions, meaning you may find wind slabs on any aspect in wind-exposed terrain. Wind slabs could step down to buried weak layers and run surprisingly far.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood: Possible
Expected Size: 1 - 2.5