Most of you have probably noticed how the wind is capable to shape and polish snow surfaces, make fascinating structures, often similar to ripples and sand dunes. Fascinating to look at, but a hustle to ski on. I guess many of you are also very capable to point out the latest wind-direction based on the shape of the structures. However, some of these structures are very complex and it can be difficult. Examples are sastrugi versus regular snow waves, they are very different features formed by wind blowing on top of snow. In this blog post we will touch a little bit into this, how they form in relation to wind direction, and how they are different from each other’s, and from ripples and dunes in sand.