http://earthobservatory.nasa.gov/Features/Hurricanes/hurricanes_2.php
During hurricane development, certain characteristics become more
prominent as the storm strengthens. At the center of the hurricane is
the eye, a cloud-free area of sinking air and light winds that is
usually from 10 to 65 kilometers in diameter. As air rises in the
thunderstorms surrounding the eye, some of it is forced towards the
center, where it converges and sinks. As this air sinks, it compresses
and warms to create an environment (mostly) free of clouds and
precipitation. The eye is the calmest part of the storm because the
strong surface winds converging towards the center never actually reach
the exact center of the storm, but instead form a cylinder of relatively
calm air.
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