WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of the complex motions of mammatus clouds in the anvil of a thunderstorm. The mammatus clouds appear as pendulous pouches of cloud, formed from regions of sinking precipitation-laden air in the storm's vast anvil. They are indicative of a particularly severe storm. Filmed in Colorado, USA, in summer.
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