Avalanche Forecast
Issued: Apr 19th, 2023 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
swerner,
Avalanche Canada
Watch for newly formed and reactive wind slabs in the alpine as you transition into wind-affected terrain.
Summary
Confidence
Low
Avalanche Summary
There have been no new reports as of Wednesday.
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
In the alpine, 20-30 cm of recent snow accompanied by moderate south wind has formed wind slabs in isolated lee features and scoured wind-facing slopes. A robust crust exists on all aspects up to 1400 m and to ridgetop on south 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
Wednesday Night
New snow 5-10 cm. Ridgetop winds 20-30 km/h from the southeast. Temperature at treeline around -5 C and freezing level valley bottom.
Thursday
Mostly cloudy. Ridgetop wind 15-25 km/h from the southeast. Temperature at treeline around -5 C freezing level 1000 m.
Friday
Mix of sun and cloud. Ridgetop wind 15-20 km/h from the southeast. Temperature at treeline around -4C with freezing level 1100 m.
Saturday
Mix of sun and cloud. Ridgteop wind 20-30 Km/h from the east. Temperature at treeline around -4 C with freezing level near 1300 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
- Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
- Be alert to conditions that change with elevation and sun exposure.
- Cornice failure may trigger large avalanches.
Problems
Wind Slabs
New snow up to 15 cm accompanied by moderate southeast wind may form fresh wind slabs on leeward slopes and terrain features.
Aspects: North, North East, East, West, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 20th, 2023 4:00PM
