Natural phenomena are very often perceived by ignorant citizens, as a miracle, something beyond the natural and so, man is limited by their senses and can make mistakes, but look at how this phenomenon perfectly.
What are lenticular clouds?
This special kind of clouds which are often mistaken for UFOs. These clouds, known as "lenticular clouds" that appear over the mountain when the wind creates a number of standing waves on the leeward side of the mountain. If kept to a certain temperature, the moisture will condense and there is a cloud in the shape of a lens or saucer. These clouds can be dangerous for pilots of large planes who avoid flying over these planes due to turbulence.