CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Formation of a hurricane. Computer artwork showing how a hurricane forms (from top). Warm moist air rises from the ocean surface. As it rises it cools and its water vapour condenses to form clouds (white). The rising air is replaced by more warm moist air from below, a cycle that creates winds (arrows) circulating around a central point. Cooled dry air at the top of the system is sucked downwards through the centre, forming a positive feedback loop that intensifies the strength of the winds.
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