Lenticular (lens-shaped) cloud

Just after 3:00 yesterday afternoon, a lenticular cloud appeared in the sky above.
This single cloud had a disk-like shape that somehow gave it an eerie appearance.
Lenticular clouds form on the leeward side of an area of rough topography when a strong wind blows from the south.
It is said that they often appear when a low-pressure system or warm front is approaching.
Photo: Lenticular cloud At the bottom of the photo is Mt. Niseikaushuppe. Nov. 6