https://sciengsustainability.blogspot.com/2017/09/tropical-storms-hurricanes-typhoon.html
Moist over the warm tropical ocean rises causes a low pressure area. Surrounding air pushes into this lower pressure area; thus, this air warms and rises. As this warm air rises, it cools forming clouds and rain. Because of the Coriolis force this whole system of air, cloud, rain and wind begin spinning and growing.
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