WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY WEATHERVIDEOHD.TV / SCIENCE PHOTO LIBRARY
Timelapse footage of a line of cumulus clouds developing into cumulonimbus clouds. The cumulus clouds increase in height due to strong convection, producing cumulus congestus clouds, taller than they are wide. With suitable instability in the atmosphere, these develop rapidly into cumulonumbus clouds, bringing thunder and heavy rain. Filmed in the USA on a spring afternoon.
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