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Snowmobile triggered wind slab in the Old Ski Bowl
SS-AM-R4-D1-S (soft slab, artificially triggered by a snowmobile, large relative to the avalanche path, relatively harmless destructive force, bed surface within new snow)
A snowmobile triggered wind slab avalanche occurred today on an east-facing slope above treeline at 8,400ft in the Old Ski Bowl. The avalanche broke 1-3ft deep, 250ft wide, and ran 10-20ft downslope. The avalanche failed on a density break within new snow. No one was caught, buried or injured. Westerly winds were actively loading leeward slopes and terrain features near and above treeline. Although this was a relatively harmless avalanche, the propagation was very impressive.
Strong westerly winds were steady throughout the day. In the afternoon, a brief rain event occurred up to 8,000ft. Skies were mostly obscured with short periods of sunshine.