One of the worst storms ever to hit Australia is hitting the north eastern state of Queensland.
Cyclone Yasi has been branded as a category five storm, which is the most severe level there is.
Winds of up to 190mph and seven-metre-high waves are expected to slam into the coast between the northern city of Cairns and the rural town of Innisfail, 60 miles south.
Thousands of people have left their homes and headed to temporary evacuation centres that have been set up in shopping malls and town halls.
State Premier Anna Bligh warned residents that Yasi could be "the most catastrophic storm to ever hit our coast".
Residents and business owners have been taping up windows and using sandbags to try to protect their properties.
The cyclone comes just weeks after the worst floods in Queensland's history, which were triggered by a series of tropical storms.