The circular eye or centre of a tropical cyclone is an area characterised by light winds, fine weather and often clear skies. The eye is the region of lowest surface pressure

The size of the eye varies from one cyclone to the next ranging from 10 km to over 100 km. The eye diameter of severe cyclones off the northwest coast tends to be about 20 to 40 km, and are typically smaller than those in some other parts of the world such as the north Pacific. The eye size of Tracy (Darwin, 1974) was just 12 km across. Rosita (Broome, 2000) only had an eye diameter of 20 km.