The furrows and rows. Where is the snow? Like between the rows or in the valleys? Or is it on one side of alternating rows? Also why is there no snow in alternate locations? Just an enquiring mind here .... No test! I can reason two different answers. The answer just adds some insight into the conditions is all. 3rd probably no one else does this but I always ask myself in large landscapes like this, in what direction am I facing. Maybe I'm a re-incarnation of an old scout or something.