Avalanche Forecast
Issued: Mar 20th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Loose Wet.
astclair,
Avalanche Canada
Clouds may temper day-time warming. Minimize exposure to cornices and steep slopes that face the sun during the warmest part of the day.
Summary
Confidence
Weather Forecast
Friday night: Clear, light to moderate west wind, alpine temperature -12 C, freezing level valley bottom.
Saturday: Increasing cloud, light to moderate west wind, alpine temperature -8 C, freezing level 1200 m.
Sunday: Cloudy, isolated flurries with trace accumulations, light to moderate southwest wind, alpine temperature -4 C, freezing level 1200 m.
Monday: Mostly cloudy, 5-10 cm of snow, light southwest wind, alpine temperature -5 C, freezing level 1200 m.
Avalanche Summary
Over the past several days, avalanche activity has been reported as natural loose wet and dry avalanches to size 1.5 and 2 running on steep, sun exposed slopes in the alpine. There have also been reports of cornices failing in the alpine on northerly aspects to size 2.5.
There are currently no professional operations reporting in the region. If you decide to travel in the backcountry, consider sharing your observations via the Mountain Information Network (MIN) to supplement our data stream as operators are shutting down. Even just a photo of what the day looked like would be helpful.
Snowpack Summary
Surface conditions are highly variable with a mix of sun crusts, moist snow, hard wind slabs, and soft faceted snow. Reports indicate that surface hoar may be developing on the surface on sheltered, shady slopes. Cornices are large, looming, and weakening with warm temperatures and strong solar radiation.
A weak layer of surface hoar buried at the end of February may be found 50-100 cm deep, except in the northern tip of the region. Sheltered north, northeast, and east facing slopes near treeline are the most likely locations to find this layer. Avalanche activity on this layer was last reported March 6th. There is a low likelihood of triggering an avalanche on this layer, but the consequences of doing so would be high.
Terrain and Travel
- Back off slopes as the surface becomes moist or wet with rising temperatures.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
- Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
- Make observations and assess conditions continually as you travel.
Problems
Loose Wet
Small loose dry or wet avalanches are possible in steep terrain facing the sun during the heat of the day. Cornices may also warm and weaken and could act as triggers for large slab avalanches..
Aspects: South East, South, South West, West.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Mar 21st, 2020 5:00PM
