Avalanche Forecast
Issued: Dec 26th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
wlewis,
Avalanche Canada
Carefully assess conditions as you gain elevation. In wind exposed terrain above the freezing line, wind slabs are likely.
Summary
Confidence
Moderate
Avalanche Summary
No avalanches have been reported in this region, however operators are limited at this point in the season.
We expect natural and human triggered avalanches to have occurred during the storm, in wind loaded terrain features.
Please help out your backcountry community by submitting a MIN report if you head out to the backcountry.
Snowpack Summary
Storm totals of 20-40 cm of heavy (wet) snow has fallen above 1800 m and formed dense wind slabs from strong southerly winds. This sits over a variety of surfaces - wind affected in exposed areas, and surface hoar in sheltered areas.
A melt-freeze crust can be found down 30-60 cm in alpine terrain. This layer has been reactive to explosive testing and in thinner areas may be reactive to human triggering.
At treeline and above a crust that tapers at higher elevations, and surface hoar in sheltered areas is buried around 70 cm deep.
Overall, the snow depth remains shallow, with average treeline snowpack depths between 70 and 100 cm.
Weather Summary
Tuesday Night
Increasing cloud, with freezing levels around 1000 m. Possible flurries overnight. Southerly winds remain strong at ridgeline, 30-50 km/h.
Wednesday
Mostly cloudy with freezing levels falling from 2000-1500 m. 5 cm of snow may fall above. Treeline temperature around 0 °C. Southerly winds 40-60 km/h.
Thursday
Cloudy with afternoon sunny breaks possible. Freezing level 1800 m. Treeline temperature around 0 °C. 5-10 cm of snow possible. Southerly winds 40-60 km/h.
Friday
Cloudy with freezing levels rising to 2000 m. Treeline temperature around 0 °C. No snowfall is expected. Southerly winds 20-40 km/h.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
- Wind slabs may be poorly bonded to the underlying crust.
Problems
Wind Slabs
Wind slabs will be most reactive where they sit over a layer of surface hoar or a hard crust.
Aspects: North, North East, East, South East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 27th, 2023 4:00PM
