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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.
A more visual method for rating avalanche size on the D-scale
A video to start discussion about whether visualization will help us rate avalanche size on the D-scale. By Bruce Jamieson, Montse Bacardit, Ethan Greene and Ian Tomm. May 2020. Catalan and Spanish subtitles by Montse Bacardit. German subtitles by Thomas Exner. CC BY-ND.
Why does snow cool when melted with salt, and what does that have to do with avalanches?
When salt is added to snow, the snow cools because heat from the snow flows into concentrated salt water around the salt grains. The surprisingly large amount of heat required for melting (i.e. latent heat) contributes to avalanche formation in at least two ways.
Ski Cutting in the Backcountry: 9 Ways to Reduce the Obvious Risk
Powder Cloud is honored to have Bruce Jamieson present 9 ways to reduce the obvious risk when ski cutting in the backcountry. Jamieson is clear that these 9 essentials are for those backcountry users who choose to ski cut for the purpose of slope testing or controlling small slopes, and are willing to accept the obvious risk. Powder Cloud and Jamieson encourage learning from a very experienced mentor and—if you are going to do it—select a combination of predictable conditions and terrain that present less surprise and less risk.
Avalanche decision aids - the good, the bad and the disruptive
This video outlines some general advantages and disadvantages of avalanche decision aids. The advantages and disadvantages are general enough that – I hope – both backcountry recreationists and avalanche practitioners find something useful in this video. This video does not explain how to use any decision aids but does show four decision aids and identify where to find more information on them.