Avalanche Forecast
Issued: Jan 22nd, 2025 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
Avalanche Canada,
Avalanche Canada
The main concern is wind slabs in exposed terrain, which may rest on a weak surface hoar layer in some areas, increasing their reactivity.
Summary
Confidence
Moderate
Avalanche Summary
Numerous avalanches were reported across the region in the alpine and treeline on Tuesday. Most were small wind slabs and loose dry slides, size 1 to 1.5, with a few larger size 2 reported. Several were triggered by riders, with naturally triggered avalanches also observed.
Avalanche activity over preceding days also involved wind slabs. At least one ran on a surface hoar layer buried in early January on a southwest alpine aspect.
Snowpack Summary
Up to 15 cm of low-density new snow has fallen over the last few days, with another 0 to 5 cm expected by 4 pm Thursday. This snow has buried a variety of surfaces including sun crust, surface hoar and facets.
The snow surface is likely wind-affected in most open areas at all elevations.
A secondary layer of weak surface hoar from early January is buried 25 to 50 cm. This layer has most recently only been reactive where wind slabs have formed above it.
A crust/facet/surface hoar layer from early December may be found 90 to 160 cm deep. Avalanche activity on this layer has tapered in recent weeks.
Weather Summary
Wednesday Night
Mainly cloudy with isolated flurries, accumulation 0 to 4 cm. 10 to 30 km/h variable ridgetop wind. Treeline high temperature -15 °C.
Thursday
Increasing cloud, with scattered flurries, accumulation 2 to 6 cm. 25 to 35 km/h westerly ridgetop wind. Treeline high temperature -9 °C.
Friday
A mix of sun and cloud. 30 to 45 km/h northwest ridgetop wind. Treeline high temperature -12 °C.
Saturday
Sunny. 15 km/h northwest ridgetop wind. Treeline high temperature -12 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Seek out sheltered terrain where new snow hasn't been affected by wind.
- Avoid areas where the snow feels stiff and/or slabby.
- Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
- Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
Problems
Wind Slabs
Wind slabs have built below ridges and in cross-loaded terrain on a variety of aspects. A layer of surface hoar buried in early January has kept slabs surprisingly reactive, sometimes propagating well above the trigger point.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 23rd, 2025 4:00PM
