Avalanche Forecast
Issued: Feb 12th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Loose Wet and Wind Slabs.
zryan,
Avalanche Canada
A widespread surface crust will create safe avalanche conditions but poor riding quality.
If this crust breaks down at lower elevations loose wet avalanches will be possible in steep terrain.
Summary
Confidence
Moderate - Uncertainty is due to the limited number of field observations.
Weather Forecast
The ridge of high pressure will start to break down with increasing cloud cover and the potential for light precipitation.
Saturday Overnight: Mainly cloudy with the potential for light precipitation. Freezing level dropping to around 500 m. Moderate northwest winds at ridgetop.
Sunday: Mainly cloudy with light precipitation. Freezing level rising to around 1500 m in the afternoon. Light southwest winds at ridgetop.
Monday: Cloudy with snowfall. Freezing level around 1000 m. Light to moderate southwest winds at ridgetop.
Tuesday: Mainly cloudy with light snowfall. Freezing level around 500 m. Strong to extreme northwest winds at ridgetop.Â
Avalanche Summary
During the rain event on Wednesday, a natural avalanche cycle occurred. Numerous wet loose avalanches were observed on all aspects and elevations. A few notable large slab avalanches were observed in the south of the region, which we suspect occurred during this rain event. Examples of these avalanches can be seen in this MIN report.Â
The last persistent avalanches associated with the late January surface hoar layer occurred on February 7th in the south of the region. These natural avalanches occurred on a shaded aspect below treeline.
Snowpack Summary
Recent rain and high freezing levels created a widespread curst on the snow surface of variable thickness that extends all the way to mountain top. Where this crust is thick and supportive, avalanches are unlikely. Warm temperatures, rain or strong solar radiation could cause this crust to break down.
Below the crust, last week's 30-50 cm of storm snow buried a weak layer of surface hoar crystals. The last reported avalanche on this layer was on February 7th in the southeast of the region and it is becoming increasingly hard to find in the snowpack with no recent reactivity in tests.Â
The lower snowpack is generally strong and well-bonded. The base of the snowpack is expected to be weak and faceted in shallow, rocky slopes east of the divide.
Terrain and Travel
- A crust on the surface will help bind the snow together, but may make for tough travel conditions.
- When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.
- As surface loses cohesion due to melting, loose wet avalanches become common in steeper terrain.
- Watch for areas of hard wind slab on alpine features.
Problems
Loose Wet
Warm temperatures and light rain may cause the surface crust to break down throughout the day. If the crust does break down, loose wet avalanches will be possible in steeper terrain
Aspects: All aspects.
Elevations: Treeline, Below Treeline.
Likelihood
Expected Size
Wind Slabs
This is only a concern in the southern part of the region. If the snow surface remains dry in the high alpine, strong westerly winds may have redistributed available snow into wind slabs in lee areas. Be aware as you transition above the rain crust and avoid any wind-loaded areas.
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Feb 13th, 2022 4:00PM
