Also: Avalanche Class
In the US the five level scale is:
These categories are in relation to path size, so a size or class number is not so meaningful without information on, or familiarity with, the path.
A reporting system used in Canada has the following size classifications:
Other systems have been proposed by Japanese and Swiss researchers, but have never come into use.
There is an international system which is based on morphological classification. It does not have categories that could lead to a term such as 'Class 3'. (Int Comm on Snow and Ice. 1981. 'Avalanche Atlas. Illustrated International Avalanche Classification.' Paris:UNESCO 265pp.)
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