Cornice ridge - Surface hoar problem

Kootenay Boundary

alexandrehetu1 , Sunday 7th February, 2021 6:10AM

We went up cornice ridge, lots of wind up on the ridge (30-40 km/h and more). A lot of snow transportation on the North and East slopes. Dug a profile below the east ridge and found the 25th surface hoar (size 6 to 18 mm) down 80 cm. We had ECTN 8 down 30cm and ECTP 24 down 80cm on that SH layer, on a 33 deg. slope. We saw numerous size 1-2 slab avalanches around cornice and buzz ridge. visibility was poor so we stayed in more sheltered area and mellow slopes. Main concern was the 30cm windslab stepping down to that SH layer, which could produce large avalanches

Snow conditions were: Powder. Weather conditions were: Stormy. We rode: Mellow slopes, Dense trees. We avoided: Alpine slopes, Steep slopes, Open trees. Riding quality was good.

Avalache Conditions: Slab avalanches today or yesterday. Whumpfing or drum-like sounds or shooting cracks.

Source: Avalanche Canada MIN