26.0 MB (2.3 MB compressed)
2466 x 3688 pixels
20.8 x 31.2 cm ⏐ 8.2 x 12.3 in (300dpi)
PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY
Cumulonimbus storm cloud. A dark cumulonimbus storm cloud seen from below. Cumulonimbus clouds are the biggest and most powerful clouds known. They form when droplets of water condense out of rising columns of moist air - conditions often associated with cold fronts. The clouds can grow into towering masses up to 15 kilometres tall, with spreading anvil-shaped tops called thunder- heads. Their interiors are highly turbulent, with violent draughts rushing up and down. The energy and water that build up in cumulonimbus clouds are released during a storm, when the clouds produce heavy downpours of rain and brilliant flashes of lightning.
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