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Cornice triggers slab avalanche

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Uploaded by on Mar 7, 2010

This cornice was cut with The BackcountryBomb Tool. The layer of concern here was approx. 16" down and giving clean shears in stability tests. We also performed a Cornice test on this north/northeast facing slope. This three cubic meter cornice released a large slab.

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Uploader Comments (BackcountryBomb)

  • What aspect was this slope? You mention you tried it on both North and Northestern slopes, same layer persiting in all of them?

  • The first cornice we dropped was approximately the same size and was facing due north. This video shows the second cornice test which dropped onto the slope as it gently wraps around to face more to the northeast.  The layer did exist on both aspects.

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  • Great video! Thanks for letting us know about this. Pretty sure that is the surface hoar that formed in late January. Still a concern though it is strengthening. We're seeing it all over Western MT on shaded aspects. Worth looking for before committing to anything. Nicely done. Are you using RB cable or small diameter rope to cut the cornice?

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