Avalanche Forecast
Issued: Nov 27th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Persistent Slabs, Wind Slabs and Loose Dry.
AB,
Avalanche Canada
Uncertainty remains with how the new snow will contribute to the likelihood of triggering persistent slabs, that were already overlying a weak base.
Summary
Confidence
Avalanche Summary
Lake Louise ski area triggered a size 1.5 wind slab with explosives in a high alpine lee pocket. Otherwise no avalanches were observed or reported.
Snowpack Summary
Up to 20cm of new snow has accumulated in the last 3 days, less so in valley bottoms. Windy conditions has promoted wind slab development in the alpine. The snowpack below these slabs is a mix of facets, spotty surface hoar, and sun crust on steep south aspects. 40-80 cm of total snow exists at treeline throughout the region, with up to 120 cm in loaded alpine features.
Weather Summary
Dropping temperatures and clearing skies into Monday. -20 at the ridge and -15 in valley are expected. The wind will also decrease into the light range from the North.
https://www.avalanche.ca/weather/forecast
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
Problems
Persistent Slabs
Slabs overly weak facets (and even some depth hoar) in most areas, as well as suncrusts and surface hoar in isolated locations.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Wind Slabs
Up to 20cm of new snow distributed by strong winds has created thin soft slabs. Many of these sit on older wind pressed surfaces.
Aspects: North, North East, East, South East, South, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
New snow and wind input on Sunday will promote loose dry avalanches. This is mainly a problem for ice climbers and skiers in steep, gullied terrain.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Nov 28th, 2022 4:00PM
