WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of the anvil of a distant thunderstorm. The anvil appears bright white. The spreading anvil forms as rising moist air reaches the tropopause, at which level it can no longer rise, so it spreads out, typically extending forwards downwind of the body of the storm. Filmed in Colorado, USA, in summer.
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