Jon Gellings of the Chugach National Forest Avalanche Information Center conducts a compression test and an extended column test at 1900ft on a northwest aspect on Tincan in Turnagain Pass, AK. Immediately after this film was shot, a large whumph was heard as he collapsed the pit wall in. CTM12Q1 and ECTH21Q2 were both observed on a buried layer of surface hoar 65cm from the top of the snowpack.
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