sixpenceee: Lenticular “UFO” clouds generally form over mountains although in rare
sixpenceee: Lenticular “UFO” clouds generally form over mountains although in rare instances they can be caused by shear winds. The clouds generally form when stable air flows over the top of a mountain. The moisture droplets are pushed up a steep slope, condensing into cloud on their way, and forming in a spiral formation over the top. (Source) -- source link