WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of a lenticular cloud, remaining stationary as the wind blows through it. The cloud forms downwind of mountains, at the crest of a standing wave of air set up as the air is forced to rise over the mountains. The unusual appearance of lenticular clouds has led to them being mistaken for UFOs. Filmed in Colorado, USA, in autumn.
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