WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of the passage of a cold weather front, marked by a band of rain. A cold front is the leading boundary of a cool mass of air. Cold air is denser than warmer air, so the front typically displaces the air it encounters, lifting it and cooling it and causing the formation of clouds and rain. Filmed in Colorado, USA, in spring.
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