Avalanche Forecast
Issued: Apr 10th, 2021 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
New snow and strong winds continue to form fresh wind slabs at treeline and above. Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
Summary
Confidence
Weather Forecast
SATURDAY NIGHT: Partly cloudy / Light, northwest ridgetop wind / alpine low temperature -10 / Freezing level valley bottom.
SUNDAY: Mostly cloudy with isolated flurries; 0-3 cm. / Light, south ridgetop wind / alpine high temperature -3 / Freezing level 1500 m.
MONDAY: Mix of sun and cloud / Moderate, northeast ridgetop wind / alpine high temperature -4 / Freezing level 1400 m.
TUESDAY: Mix of sun and cloud / Moderate, northeast ridgetop wind / alpine high temperature -4 / Freezing level 1400 m.
Avalanche Summary
Small loose dry and wind slabs up to size 1.5 were reported in this region on Friday.
Snowpack Summary
5-10 cm of convective new snow and strong southwesterly winds are forming fresh wind slabs on lee features at treeline and above. This brings recent snow totals to 20-30 cm. The recent snow is sitting on hard crusts on solar aspects and a mix of wind affected or soft surfaces on shady aspects.
Cornices are large, looming, and capable of triggering large avalanches when they fail.
The mid-pack is firm and well settled. Some faceted snow and a decomposing melt-freeze crust can be found near the base of the snowpack that may become a concern when the next big warm-up arrives.
The snow line is slowly creeping up to higher elevations. Check out this MIN report for more details on the access from common staging areas.
Glide cracks releasing as full depth glide slab avalanches become more common in the spring and are extremely difficult to predict. Best practice is to avoid slopes with glide cracks.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Avoid lee and cross-loaded terrain.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
Problems
Wind Slabs
5-10 cm of convective new snow and strong southwesterly winds are forming fresh wind slabs on lee features at treeline and above.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Cornices
Cornices are large and looming along many ridgelines and have likely grown with the recent wind.
Strong solar radiation and warming are common triggers for cornice failures which could trigger large avalanches.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 11th, 2021 4:00PM
