Australia's worst ever cyclone 'Yasi' on Wednesday hit the country's flood-ravaged northern Queensland province wrecking havoc and damaging houses. Yasi of category five was travelling at 29 km per hour and was estimated to be 150 km east north-east of Innisfail and 175 km east of Cairns. It was moving in a west-south-west direction. Innisfail Mayor Bill Shannon said, he had already seen the roof torn from a building near the council chambers where 500 people are sheltering. Damaging winds with gusts of 90 km per hour are currently affecting the coast and islands, and are forecast to spread into the tropical interior overnight and west to Julia Creek on Thursday.