The structure of a tropical cyclone Contains the spiral arms of clouds accumulator Lo Nimbus cloud formation, which is vertical to become cloud thunderstorm. Rotate counterclockwise around the center.To Causing the rain (Rainbands) at the center of the storm is called a "storm" (Eye), a low pressure cell which cloudless sky. Wall eye of the storm (Eyewall) is a large circular cloud lifted vertically and has spread out through the thick clouds which surround Russell (Dense Cirrus Overcast), covered ring cell thunderstorm clouds below.