Avalanche Forecast
Issued: Nov 29th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
ahanna,
Avalanche Canada
Uncertainty around conditions is best managed through a conservative approach. Avoid recently wind loaded areas in the alpine and upper treeline.
Summary
Confidence
Weather Forecast
Monday night: Increasing cloud. Southwest wind becoming strong. Freezing level 1900 m.
Tuesday: Flurries, up to 5 cm. Strong southwest wind. Freezing level 2000 m.
Wednesday: 10-20 cm new snow, rain below 2000 m. Strong southwest wind. Freezing level 2400 m.
Thursday: 5-10 cm overnight then clearing. Moderate westerly wind. Freezing level dropping 2000 to 1700 m.
Avalanche Summary
Neighboring Kananaskis Country reported a widespread natural avalanche cycle up to size 3 running full path on Sunday as well as a few naturals up to size 2 on Monday. Several of these large avalanches stepped down to a buried crust.
Reports in the region remain limited. If you go out in the mountains, please share your observations and/or photos on the Mountain Information Network!
Snowpack Summary
With large gaps in field data, uncertainty exists around current conditions. We suspect wind pressed surfaces in the alpine and moist to wet snow treeline and below.
Two crusts are found in the snowpack: the mid-November rain crust buried 20-30 cm and reported up to 2100 m, and a crust from early November found at the bottom of the snowpack up to 2300 m, this crust is being to break down and facet. The heavy storm this week test the potential for failure on this layer.
Snowpack depths range from 40-150 cm at treeline elevations. Higher elevations may hold a deeper snowpack, but also be more heavily impacted from recent winds. Snowpack depths decrease rapidly below 1900 m.
Early season hazards are very real right now, be wary of thin/shallow snowpacks, rocks, stumps, creeks, and other sharks hidden under fresh snow.
Terrain and Travel
- In times of uncertainty conservative terrain choices are our best defense.
- Stay off recently wind loaded slopes until they have had a chance to stabilize.
- Be alert to conditions that change with elevation and wind exposure.
- Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
Problems
Wind Slabs
Wind slabs may be reactive, especially to human triggers. There may be potential for wind slab avalanches to step down to a buried crust, producing very large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Nov 30th, 2021 4:00PM
