New rules

27th February 2010

(Above) Avalanche in Coire Ardair with debris running across the main path into the corrie. Crownwall at 800m with debris running down to the 500m contour line. It ran on a SSE aspect and the slab was crossloaded into the shallow burn line (click on the photo and you’ll see evidence of wind direction along the glen). There is a ‘sister’ avalanche path a kilometre east of this one that runs through mature woodland and can produce much bigger avalanches. No activity there today but the start zone is fully loaded.
(Above) Here are the culprits. We have at least two very weak layers underneath all the recent slab and this stuff fails really easily even on low-angled ground.

The current snowpack is remarkably un-Scottish. The sort of weak layers we have at the moment tend to persist, so new rules apply for a while when assessing stability. Think Alpine.

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