JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY JIM REED PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Tornado. Storm chasers' research van in front of a tornado in Kansas, USA. A tornado is a violent rotating column of air that forms within thunderstorms. It is characterised by a funnel-shaped cloud measuring up to 100 metres in diameter and powerful winds that move at over 500 kilometres an hour, causing widespread devastation.
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