Great idea!
Or greyscale “snow-coverage texture” could be interesting, both for 3d objects and aerial textures…
Where brightness value is used as threshold for what should be covered in snow. “Everything brighter than X will get snow”. Could give some interesting possibilites with wheel-tracks exposing asphalt and plowed snow in the edges of aprons / rwy / twy / roads.
(I’ve sometimes used metal-channel for standing water puddles in ground materials, therefore proposing leaving the metal alone 
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