Avalanche Forecast
Issued: Apr 20th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Cornices.
JSmith,
Avalanche Canada
Moderate southerly winds have formed wind slabs that may remain reactive to human triggers on lee features at treeline and above.
Use ridges or ribs to avoid areas of wind loaded snow.
Summary
Confidence
Moderate - Uncertainty is due to the limited number of field observations.
Weather Forecast
Wednesday night: Cloudy with flurries; 5-15 cm (rain below around 800 m) / Moderate southeast wind / Low of -3 / Freezing level 1100 m.
Thursday: Cloudy with flurries; 3-10 cm (rain below around 1300 m) / Light south wind / High of 2 / Freezing level 1600 m.
Friday: Mix of sun and cloud / Light west wind / High of 3 / Freezing level 1800 m.
Saturday: Mix of sun and cloud / Light west wind / High of 4 / Freezing level 1900 m.
Avalanche Summary
Skier and snowmobiler triggered storm slab avalanches up to size 2 were reported on Tuesday. North and easterly aspects that had been loaded by the wind at treeline and above were the most reactive. See MINs Here and Here.
We currently have very limited avalanche observation data from this region.
Please consider posting your observations to the Mountain Information Network (MIN). Photos of current conditions and avalanches are the most helpful.Â
Snowpack Summary
5-15 cm of new snow Wednesday night will add to the 35-55 cm of recent snow. Moderate southerly winds have formed wind slabs that may remain reactive to human triggers on lee features at treeline and above.
The recent snow is sitting on a variety of hard snow surfaces, including crusts and wind scoured snow. Below this, there are several crusts in the upper snowpack, but they are unlikely to be a concern in most areas until the next significant warming event.
Terrain and Travel
- Be especially cautious as you transition into wind affected terrain.
- Use ridges or ribs to avoid areas of wind loaded snow.
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Avoid exposure to slopes that have cornices overhead.
Problems
Wind Slabs
Moderate southerly winds have formed wind slabs that may remain reactive to human triggers on lee features at treeline and above.
Use ridges or ribs to avoid areas of wind loaded snow.
Aspects: North, North East, East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Cornices may be weak and reactive to human triggers. They create a significant falling hazard, and may produce large slab avalanches as they fall onto the slope below.
Cornice failures are more likely during hot and sunny weather.
Aspects: North, North East, East, West, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 21st, 2022 4:00PM
