WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of a shelf cloud marking the outflow boundary or gust front of cold air from thunderstorm. The outflow boundary is the region in which cold, sinking air from the thunderstorm runs into the air around it. A dense column of rain follows the outflow boundary here. Filmed in Colorado, USA, in autumn.
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