Observation Guidelines and Recording Standards for Weather, Snowpack and Avalanches (OGRS) describes the terminology, techniques and encoding recommended by the Canadian Avalanche Association for taking and recording observations of the weather, snowpack and avalanches.
OGRS 2007 Errata Appendix D Grain Classification
downloadOGRS 2007 Addendum Section 3.4.3 Avalanche Starting Zone
downloadOGRS 2007 Erratum Section 1.4 Sky Cover
downloadOGRS 2007 Addendum Appendix B.4 Avalanche Involvement Definitions
downloadOGRS 2007 Proposed Guidelines for Extended Column Tests
downloadOGRS 2007 Proposed Guidelines for Propagation Saw Tests
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