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AvCan Northwest , Tuesday 4th January, 2022 3:15PM
Today we went to Sterling and snowmobiled at tree line. We saw evidence of natural wind slab activity on shady (N facing) slopes in the alpine. These size 2 avalanches appeared to have happened over the weekend after the storm cycle. We could see moderate NE winds transporting snow in the alpine, and previous wind affect (from W winds) extended down into the trees. In the trees at 1000m, boot penetration was up to 60cm. We found 50cm new snow overlying a layer of facets (sugary, weak grains). In snowpack tests, this layer failed during hard hits (ECT N, CT H RP) but did not propagate on an Extended Column Test (ECT). Below this we found several older melt-freeze crusts interspersed between more layers of facets all of which had 1 Finger, Pencil, or Knife hard density (quite good strength).
Snow conditions were: Powder, Wind affected. Weather conditions were: Cold, Sunny. We rode: Mellow slopes, Open trees. We avoided: Alpine slopes, Convex slopes. Riding quality was good.
Avalache Conditions: Slab avalanches today or yesterday. 30cm + of new snow, or significant drifitng, or rain in the last 48 hours.