Roger's SkyPix

Okie Winters

Snow Ripples as Mini-Dunes

Snow Ripples as Mini-Dunes

Dune formation isn't just a larger-scale effect of sand over many square miles; it can happen on scales of inches under the right conditions. Wind-blown snow works too! Here, miniature transverse dunes, with minor barchanoid tendencies, remained atop the snow on the morning after a blizzard. Howling NW winds of 40-60 mph blasted along this curvy hillside, and generally across the direction of these little ridges in the snow. Without something for scale, such as the small sticks poking from the snow at upper left, this easiy could pass for an earial shot of a desert of white sand from a plane, or perhaps a glacial surface rippled by structural stresses.

Norman, OK (25 Dec 9), looking NNE