When a tropical low intensifies into a tropical cyclone between 10 Â S and 40 Â S and between 90 Â E - 160 Â E , then it will be named by one of three Australian national weather service offices in Perth , Darwin , or Brisbane . When a tropical low intensifies into a tropical cyclone between 10 Â S and 40 Â S and between 90 Â E - 160 Â E , then it will be named by one of the Tropical Cyclone Warning Centers in Perth , Darwin , or Brisbane .