ABC News segments detailing the approach of cyclone Yasi to the far north Queensland coast. Includes reports from journalists at the scene and meteorological information.
A tropical cyclone is a low-pressure system which develops in the tropics and is sufficiently intense to produce sustained gale force winds of at least 63km/h. If the sustained wind reaches hurricane force of at least 118km/h the system is defined as a severe tropical cyclone. In other parts of the world they are called hurricanes or typhoons.