Rare Lenticular Clouds That Look Like UFO
April 04, 2013
Lenticular clouds (Altocumulus lenticularis) are stationary lens-shaped clouds that form at high altitudes, normally in perpendicular alignment to the wind direction. Due to their shape, they have been offered as an explanation for some Unidentified Flying Object (UFO) sightings.
Image credits: Brian Middleton