A rare phenomenon in Crete - why pilots avoid these clouds - 12 January, 2018
A unique moment at the Cretan sky immortalized with his camera, by Yiannis Ghikas.
These are lenticular clouds. Lenticular clouds (Altocumulus lenticularis in Latin) are stationary clouds that form in the troposphere, typically in perpendicular alignment to the wind direction. They are often comparable in appearance to a lens or saucer.
Pilots of aircraft tend to avoid these clouds because of the turbulence that accompanies them.
In Rethymnon, however, in the past we have seen them before, due to the southern winds that often blow there.
From: http://flashnews.gr/post/339031/ena-spa ... ta-synnefa
In the past, these clouds have also appeared south of Sfakia. Forum member Mike in those days had made a photo of them: