Hurricanes are large tropical storms with sustained windspeeds of 74 mph or more. The parts of the hurricane are shown in the diagram.

Warm moist air rises. A low pressure center forms as the warm air rushes upward.

An eyewall forms around the eye (a calm center).

Rainbands or feeder bands form outside the eyewall.

Notice the counterclockwise movement of air around the primary vortex.  This is the type of flow associated with low pressure. 

Warm moist air rises creating the eyewall updraft.  The water condenses into the thick cirrus overcast, the swirl of clouds typical of a hurricane. 

The cooler air releases water in the form of precipitation in the rainbands.  Notice that the hurricane is both very wide and high in altitude.