WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of a cloud formed by wind over mountains. As moist air passes over mountains (along bottom) it is forced upwards and moisture condenses into clouds. On the downslope the air sinks again, but the passage over the mountains sets up a standing wave in the air, and where the air rises again past its dew point, a stationary cloud forms at its peak. Filmed in the USA in winter.
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