Reactive Wind slab

Banff Yoho & Kootenay National Park

Moneypenny_MakesMINS , Thursday 23rd December, 2021 1:50PM

Skied the front side chutes on Tumbling Outlier after skiing the same feature yesterday. Dramatic change in conditions. Reverse loading has affected open terrain. Skin track had be blown in overnight and breaking trail along the upper treeline shooting cracks and very reactive wind slab was propagating around convexities. Ski cutting cornices/wind slabs into the upper decent produced reactive but isolated propagation. Hopeful it was going to be limited to the top 30m we were surprised to find it continued well down into the midway part of the decent. Turn by turn produced extremely reactive slabs up to 30cm thick moving fast on potential burried surface hoar and older denser snow. Unfortunately no pictures or pits but just a heads up for that isolated popular zone I'd have rated it High, High, Con today. Careful over the next few days.

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

Avalache Conditions: Slab avalanches today or yesterday. 30cm + of new snow, or significant drifitng, or rain in the last 48 hours. Whumpfing or drum-like sounds or shooting cracks.

Weather

Reverse loading up slope S/SE winds.