The structure of a cyclone Contains the spiral arms of clouds accumulator Nimbus cloud formation, which is vertical to become thunderstorm Clouds. It rotate counterclockwise around the center to causing the rain (Rainbands) at the center of the cyclone which is called a "Eye" where it have low pressure and cloudless sky. 3.Wall of the eye (Eyewall) is a large circular cloud lifted vertically and has spread out to the side.