Cyclones look like huge disks of clouds. They are between 10 and 15 kilometres thick. ... They are made of bands of storm clouds rolled into a spiral around a zone of very low pressure called the eye of the cyclone. Winds are drawn in toward the eye of the cyclone.
Tropical cyclones form near the equator and gain their energy from the heat that is released when water vapour condenses into rain. They are about 500 km across and may have a central region with relatively little cloud and light winds called the eye.