Avalanche Forecast
Issued: Nov 10th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
Grant Statham,
Thursday looks like an excellent day before the weather changes on Friday and there is potential for big snow over the weekend. Climbers watch for spindrift and pockets of windslab in exposed areas and between pitches at higher elevations.
Summary
Weather Forecast
Thursday looks like a beautiful day with mostly clear skies, light winds and temperatures ranging from 0 to -10. Starting Friday a strong frontal system will cross the region bringing snow, wind and warming temperatures. Some optimistic weather models are calling for 80-90 cm between Friday and Tuesday, but we expect less.
Snowpack Summary
5-10cm last 24 hours with previously strong winds forming windslabs in alpine areas. Up to 30cm of snow over the last 5 days in the alpine, sitting over a melt freeze crust that may be present to ~2500 m. Below the crust is 10-30cm of facetted snow , increasing to 60-70cm in the alpine. Below threshold for avalanches at treeline and below.
Avalanche Summary
We have very limited observations. Yesterday, Lake Louise ski patrol triggered several windslab avalanches up to size 1.5, on average 40 cm deep. Also yesterday at Bow Summit there was a third hand report of someone going for a ride in a small windlslab. Conditions have changed with the wind over the past 36-hours.
Confidence
Problems
Wind Slabs
Recent windslabs will be easily triggered in many alpine areas, and although small, these avalanches could give someone a rough ride through the rocks.
- Use caution in lee areas in the alpine. Recent storm snow has formed wind slabs.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Nov 11th, 2021 4:00PM
