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From 3 to 30. How many levels should a rating have?
Having found little published guidance on the optimal number of levels in a rating system, Bruce Jamieson and colleagues use examples, mostly from avalanche and weather forecasting, to identify a basic guideline and several other considerations. 03:40 Matthew MacDonald on AQHI ratings 09:52 Matthew MacDonald on precipitation likelihood ratings 12:11 Pascal Haegeli on the avalanche danger rating 18:53 Jesse Percival on rating skier compaction 21:25 James Floyer on avalanche size ratings in public bulletins
It's convex. Should I avoid it?
Views on the roles of convexities in human triggered avalanches vary widely. In this educational video intended for intermediate and advanced winter backcountry recreationists, Ron Simenhois and Bruce Jamieson present various perspectives and research on human triggering near convex slopes. CC BY-ND.
Communicating avalanche likelihood and probability
Starting with the likelihood definition and terms in the Conceptual Model of Avalanche Hazard (Statham et al., 2018), Scott Thumlert, Grant Statham and Bruce Jamieson present some ideas for improving avalanche likelihood and how it can be communicated. Presented at the Virtual Snow Science Workshop, October 2020. CC BY-ND.
Near crust faceting and slab avalanching
A technical video for avalanche practitioners and recreationists interested in avalanche science. The video outlines the formation of faceted layers near melt-freeze crusts, the persistence of these layers as potential failure layers for slab avalanches and some ideas on anticipating the resulting slab avalanches. Bruce Jamieson and Scott Savage, May 2020.