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RegisterNov 10th, 2021–Nov 11th, 2021
Banff Yoho Kootenay.
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.
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.
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.
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.