Avalanche Forecast
Issued: Jan 20th, 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
Wind slabs in exposed terrain are the main concern. In some areas these slabs may be sitting on a weak layer of surface hoar leading to increased reactivity.
Summary
Confidence
High
Avalanche Summary
Avalanche activity over the past few days has been reported as several wind slabs both natural and rider triggered size 1-2 in the alpine. At least one of these was reported to run on a layer of surface hoar buried in early January on a southwest aspect in the alpine. As well there were several reports of dry loose avalanches running to size 1 and 1.5 in steep terrain.
Snowpack Summary
The snow surface is likely wind affected in open areas at all elevations.
10 to 40 cm of snow since early January has been slowly settling on a layer of weak surface hoar crystals that exists into the alpine. 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
Monday Night
Mainly cloudy with scattered flurries, accumulation 1 to 3 cm. 20 to 40 km/h west and northwest ridgetop wind. Treeline high temperature -13 °C.
Tuesday
Mainly cloudy with scattered flurries, accumulation 1 to 4 cm. 25 to 55 km/h northwest ridgetop wind. Treeline high temperature -9 °C.
Wednesday
Mainly cloudy. 20 to 40 km/h northwest ridgetop wind. Treeline high temperature -8 °C.
Thursday
Mainly cloudy with flurries.15 to 35 km/h northwest ridgetop wind. Treeline high temperature -7 °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.
- Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
Problems
Wind Slabs
Human-triggerable wind slabs exist 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.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 21st, 2025 4:00PM
