sound of skiing through the snow (ref)
When the fracture of a weak snow layer causes an upper layer to collapse, making a whumpfing sound.
Whumpf has been adopted as a technical avalanche term to describe the sound of a collapsing snowpack when you cross the snow. For instance, "we got a lot of whumpfing today", or "the snowpack whumpfed like rolling thunder just before it released and caught us." Avalanche Encyclopedia
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