Tropical cyclones are named for historical reasons and so as to avoid confusion when communicating with the public, as more than one tropical cyclone can exist at a time. Names are drawn in order from predetermined lists. They are usually assigned to tropical cyclones with one-, three- or ten-minute windspeeds of at least 65 km/h (40 mph). However, standards vary from basin to basin, with some tropical depressions named in the Western Pacific whilst tropical cyclones have to have gale-force winds occurring more than halfway around the center within the Australian and Southern Pacific regions.