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© vk.com
Lenticular clouds (Altocumulus lenticularis) are stationary lens-shaped clouds that form in the troposphere, normally in perpendicular alignment to the wind direction.
Typically they form when strong winds drive moisture droplets up the steep slope of mountain formations or other topographic barriers. These droplets then condense into clouds, creating these fascinating UFO-like shapes in the sky.
Bright colours (called iridescence) are sometimes seen along the edge of lenticular clouds.
© vk.com
© vk.com
Comment: Increasingly unstable weather patterns may be assisting the formation of bizarre cloud patterns observed around the world recently. Factors which may contribute to these 'strange skies' are possible comet dust loading and changes in the layers of the atmosphere. See also: