Facts about cyclones
● CYCLONeS are intense, violent storms characterised by high-speed winds rotating clockwise around a tropical low-pressure system, producing torrential rain, that often leads to flooding.
● Tropical cyclone intensity is defined by the maximum average wind speed over open flat land or water. The severity of a cyclone is described in categories from 1 to 5, which are determined by the maximum wind speed.
● In order to be identified as a cyclone, it must be travelling over 119km per hour and it must have been formed over the ocean in a tropical region.
● According to the Bureau of Meteorology, Australia has, on average, 13 cyclones a year.
● Tropical cyclones in the Southern Hemisphere spin clockwise.
● The average life of a cyclone is three to seven days.
● Cyclones are assigned names, which are chosen from a list.
● Cyclone Tracy (1974) has been Australia’s most destructive cyclone to date.