January 7, 2008

The "Extended Column Test"

The promotion of this "test" as something useful in decision making in the field has bothered me for quite a while. I will have to find time to write more about it again later, but here is the short version of my concerns, as well as a suggestion for what to ask anyone promoting this.

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April 13, 2007

Slabs Vs Loose Snow

Slabs of snow are continuous bodies, and are subject to deformation and the development of internal stresses for that reason. Loose snow without any cohesion does not form a continuous body and its behavior is that of a collection of unconnected grains. Comments in at least one public advisory show a lack of understanding of the fundamental differences.

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February 27, 2007

The "Critical Temperature Gradient" Myth

For years the figure of 1 C per 10 cm of depth has been called a "critical temperature gradient" and considered the gradient in the snowpack at which faceting of the grains begins. In a recent forum topic the original question was what is most important for facetting and of course this number was presented right away.

What is actually important is the vapor pressure gradient. Depending on the temperature the gradient may need to be much larger than this "critical value" before faceting actually begins to occur.

... Read more ...

January 26, 2007

Alpha (Runout) Angles and Climate Regimes

This has been moved the the Avalanche-Center.org Education and Science Blog:


This blog site is in the process of being dismantled and most of the content will be moved to avalanche-center.org

April 20, 2006

Welcome / About this Blog

Welcome to my blog on snow avalanches. Over time I've found various issues, comments and claims that I'd like to comment on. This blog will allow me to do that. The comment feature allows a certain amount of feedback, pro and con. More extensive discussion is always welcome in the forums at http://www.avalanche-center.org/phpBB2/

Titles of the most recent posts can also be found on the newsfeeds page at http://www.avalanche-center.org/News/newsfeeds/

While I encourage the use of avalanche-center.org for discussions (as well as for general reference and education) this blog has no formal or official affiliation with that site. Nor any other. Nor is it affiliated with any other individual(s). Everything written here is by me, and I'm responsible for it, unless it is a comment or otherwise attributed to somebody else in particular.

Comments need to be approved, otherwise there is an overwhelming amount of spam. I generally don't believe in approval or editing based on content so disagreements and opposing points of view are welcome as long as they are civil and intelligent. So if you don't see your comment for a little while it's just a matter of me approving it.

I'm also open to guest and invited blog entries, feel free to request a topic or a person to invite by emailing me at snowman@csac.org