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Spark R&D
P.O. Box 3284, Bozeman, MT 59772 USA
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When a layer in a slab collapses it can create a whomfing noise - this is the air compressing out of a weak layer. From the National Avalanche Center, "This is the sound of nature screaming in your ear that the snowpack is very unstable". Cracks are sometimes seen shooting through the snow away from a skin track or the path you are making while riding down a slope. This is another sign of unstable snow.
Snow is easily transported by the wind and when it is deposited it can form wind slabs. These slabs add weight to a snowpack and can make it easier to cause a weak layer in the snow to fail. Pay close attention to wind direction, especially where it is coming off of ridges.