Avalanche Forecast
Issued: Apr 15th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
jsmith,
Avalanche Canada
Lingering wind slabs may remain reactive to human triggers on lee aspects in the alpine.
Avoid steep, rocky, and wind affected areas where triggering slabs are more likely.
Summary
Confidence
Moderate
Avalanche Summary
No avalanches were reported on Friday.
A size 3 persistent slab avalanche was reported on a southeast aspect in the alpine west of Kelsall lake on Thursday. It was suspected to have been triggered by solar radiation.
Observations are limited at this time of year, please consider sharing any information or photos you have on the Mountain Information Network to help guide our forecasts.
Snowpack Summary
20-30 cm of recent snow and light to moderate south wind may have formed wind slabs in isolated lee features in the alpine.
The recent snow sits over previously wind-affected snow surfaces on northerly aspects and sun crust on other aspects.
A weak layer of surface hoar/crust/facets buried in early January is now around 100 cm down in most areas. Operators continue to monitor this layer. A significant warming event or a large trigger (like a falling cornice) are the most likely things to activate this layer.
Weather Summary
Saturday Night
Partly cloudy with isolated flurries; 0-10 cm / 20 km/h south ridgetop wind / Temperature at treeline around -8 C / Freezing level valley bottom
Sunday
Mix of sun and cloud with isolated flurries; 0-10 cm / 10 km/h east ridgetop wind / Temperature at treeline around -4 C / Freezing level 900 m
Monday
Mix of sun and cloud / 10 km/h northwest ridgetop wind / Temperature at treeline around -4 C / Freezing level 800 m
Tuesday
Snow; 10-15 cm / 20 km/h northeast ridgetop wind / Temperature at treeline around -2 C / Freezing level 1100 m
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid freshly wind loaded terrain features.
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Cornice failure may trigger large avalanches.
Problems
Wind Slabs
Lingering wind slabs may remain reactive to human triggers on lee aspects in the alpine.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Persistent Slabs
A weak layer of surface hoar/crust/facets buried in early January is now around 100 cm down in most areas.
Operators continue to monitor this layer. A significant warming event or a large trigger (like a falling cornice) are the most likely things to activate this layer.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 16th, 2023 4:00PM
