Avalanche Forecast
Issued: Nov 23rd, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Deep Persistent Slabs.
Timothy Johnson,
After a brief lull in the the weather on Wednesday, strong winds and precipitation will return on Thursday increasing the avalanche hazard.
Summary
Weather Forecast
Tonight: Clear periods.
Alpine temperature: Low -13 C.
Ridge wind west: 10-30 km/h.
Wednesday: Cloudy with sunny periods and isolated flurries.
Precipitation: Trace.
Alpine temperature: High -11 C.
Ridge wind southwest: 20-40 km/h.
Thursday: Flurries.
Accumulation: 8 cm.
Alpine temperature: Low -12 C, High -7 C.
Ridge wind southwest: 20 km/h.
Snowpack Summary
Previous strong SW winds stripped all aspects in the alpine. New snow with warm temperatures and moderate winds have likely create new wind slabs. Above freezing temperature to 2000m will likely result in a future crust. A 1-2cm thick crust 80cm down is found up to 2500m. Below this crust are more crusts or facets depending on elevation.
Avalanche Summary
No new avalanches were observed on Monday.
Confidence
Due to the number and quality of field observations
Problems
Wind Slabs
Even though the winds have died down there are lurking windslabs from previous winds in lee and cross loaded features.
- Use caution in lee areas. Recent wind loading have created wind slabs.
- Avoid steep lee and cross-loaded slopes
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Deep Persistent Slabs
60-80cm of storm snow from Nov 13-15th has settled over a series of crusts and weak snow crystals at the base of the snowpack.
- Avoid thin rocky or unsupported terrain features.
- Use caution on open slopes and convex rolls
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Nov 24th, 2021 4:00PM
