Avalanche Forecast
Issued: Mar 19th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs, Cornices and Persistent Slabs.
TRettie,
Avalanche Canada
Carefully assess the wind slab hazard as you gain elevation. Rider triggerable wind slab will likely be found in exposed terrain.
Summary
Confidence
Weather Forecast
Saturday night: flurries bringing up to 5 cm of new snow with moderate southwest ridgetop winds. Low of -8 at 1500 m.
Sunday: cloudy with light flurries bringing up to 5 cm of new snow. High of -2 at 1500 m. Moderate to strong southwest winds.
Monday: cloudy with around 5cm of new snow expected. Moderate to strong southwest winds and freezing levels rising to 1600 m.
Tuesday: cloudy with 5 cm of new snow expected with strong southwest winds. Freezing levels rising to 2100 m.
Avalanche Summary
Over the past few days skiers have triggered wind and storm slab avalanches up to size 1.5. Most of this avalanche activity has been on north aspects and at or above treeline. We suspect more of this type of avalanche activity will be reported on Saturday.
Snowpack Summary
Wind slabs can be found on north and east aspects at treeline and above. 20 to 40 cm overlies surface hoar in shady, wind-sheltered areas and a hard melt-freeze crust on all aspects below 1500 m and on sun-exposed slopes into the alpine.
Around 50-80 cm deep, a weak layer of facets may be found above a melt-freeze crust that formed in February. This layer had been most reactive on north and northeast aspects between 1600 and 2100 m. While this layer is now likely dormant in most areas, it still remains a concern for professionals in the region and could still be capable of producing isolated large avalanches if triggered. Check out this forecaster blog for more info.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
- Be aware of the potential for large avalanches due to the presence of buried persistent weak layers.
Problems
Wind Slabs
New wind slabs can be found on North and East aspects in exposed treeline and alpine terrain. Strong winds mean that wind slab could be found further down slope than expected.
Aspects: North, North East, East, South East, West, North West.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
Fragile new cornices have been reported recently. Give cornices a wide berth when traveling on or below ridges.
Aspects: North, North East, East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Persistent Slabs
A weak layer of facets above a hard melt-freeze crust may be found around 50-80 cm deep. Last week this layer produced large avalanches. The problem was most prevalent on north to northeast aspects between 1600 and 2100 m.
Aspects: North, North East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Mar 20th, 2022 4:00PM
