Videos for avalanche practitioners
The videos posted to this channel since ~2015 are by Bruce Jamieson (snowline.ca) and colleagues. Some of the earlier videos on this channel are links to videos made by Bruce Jamieson and ASARC colleagues (UCalgary.ca/asarc). The links to all these videos can be shared freely and the videos used for any purpose, including commercially, provided the content and authorship are not altered.
Videos for avalanche practitioners
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.
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.
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.
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.
Field observations vs snowpack tests: Which is best when?
In this study in recent winters, simple field observations correlated with the local avalanche danger better than snowpack tests. However, when Persistent Slabs dominate the Public Bulletin, snowpack tests may be helpful to supplement the field observations (they are better indicators of instability than stability). In spite of their limitations for selecting low risk terrain on the current day, snowpack tests may - over time - help recreationists become better at interpreting the bulletin and making low risk decisions.
Common snowpack tests
A brief how-to for common snowpack tests to locate and assess instabilities within the snowpack, presented by Mike Conlan. Start times of tests in this video are as follows: 1:32 Compression Test 5:06 Deep Tap Test 7:28 Extended Column Test 10:54 Rutschblock Test 14:48 Propagation Saw Test 18:48 Shovel Shear Test 20:49 Hand Shear Test 22:11 Concluding remarks on initiation, propagation, and limitations. Fracture character video: http://vimeo.com/30996756