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title
Persistent to Deep Persistent – Why the Switch?
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DateThursday, December 15, 2022AuthorGrant Statham, Parks CanadaIn the December 10, 2022 public avalanche forecast for Banff, Yoho, and Kootenay National Parks, the primary avalanche problem changed from a persistent slab to a deep persistent slab problem. Why did it change and what does this mean?A persistent slab is a cohesive slab of snow overlying a persistent weak layer (PWL) such as surface hoar, facets, or a crust. The bond between this slab and the weak layer is poor and slow to strengthen, creating a snowpack structure that is prone to failure for long periods of time. Persistent slabs are nasty, but eventually the weak layer strengthens, bonds to the snow above and the problem goes away. This cycle generally lasts four to eight weeks. Persistent slabs can form at any time of the winter, usually following a clear period where a weak layer has formed on the surface of the snow and is then buried by subsequent snowfalls. Usually, the problem starts out as a storm or wind slab un...
author
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2025-11-09 15:39:34
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