Avalanche Forecast
Issued: Apr 18th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Cornices.
dsaly,
Avalanche Canada
Be mindful of reactive slabs forming with new snow, the deepest deposits will be in areas loaded by wind. Bump the hazard to Considerable if you find more than 20 cm fresh snow in your riding area.
Summary
Confidence
Moderate - Uncertainty is due to the track & intensity of the incoming weather system.
Weather Forecast
MONDAY NIGHT: Cloudy with flurries, 5-15 cm. Treeline low -6 C. Increasing southeast-southwest wind, 15-30 km/h.
TUESDAY: Wet flurries and snow, another 5-10 cm through the day with rain below 1400 m. Treeline temperatures rising to -2 C. Wind 15-30 km/h from the west.Â
WEDNESDAY: Partially cloudy. Treeline temperatures rising to +1 C, freezing level reaching 1700 m. Light wind from the south.Â
THURSDAY: Mix of sun and clouds. Treeline temperatures rising to +2 C. Light winds from the southeast.
Avalanche Summary
Avalanche activity the last week has primarily been large cornice failures on north and east-facing slopes. For the most part, these have not triggered avalanches on the slopes below.
Snowpack Summary
At treeline and higher, fresh snow will cover old wind slab and wind press, and up to 20 cm of old snow. This sits on a melt-freeze crust all aspects to 2000 m and mountain tops on solar aspects. Another prominent crust layer is found 30-70 cm deep.Â
Cornices are very large and exposure to slopes beneath them should be minimized, especially if the weather is sunny, warm, or windy. The snowpack deteriorates rapidly at lower elevations.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Closely monitor how the new snow is bonding to the crust.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
Problems
Wind Slabs
Upwards of 15 cm flurries is forecast to accumulate by the end of Tuesday, with localized areas getting up to 25 cm. New snow is not expected to bond well with the old surfaces, particularly on the old crust. Expect slab reactivity to increase through the day, especially in wind-loaded terrain.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Cornices may be weak and reactive to human triggers. Give them a wide berth when travelling on ridges. They are a significant hazard alone and may produce large slab avalanches as they fall onto the slope below. Cornice falls are more likely when the weather is sunny, warm, or windy.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 19th, 2022 4:00PM
