NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Low pressure weather system from space. Image taken from the International Space Station (ISS) of a low pressure weather system over the eastern North Pacific Ocean. Low pressure systems (cyclones) are characterised by a central region of rising air that draws air into it from the surrounding area. The rotation of the Earth causes such systems to develop a spiral shape. This system has started to occlude, that is a body of cold air is undercutting a mass of warmer air, forcing it to rise.
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