ROUGH CUT, NO REPORTER NARRATION<br/> <br />A tropical cyclone hit Australia's west coast on Saturday, packing winds of more than 250 kms (155 miles) per hour.<br/> <br />Tropical Cyclone Lua has been upgraded to a Category 4, the second most severe on the Australian scale.<br/> <br />It crossed the West Australian coast in a sparsely populated area north of Port Hedland in the early afternoon, the Bureau of Meteorology said. Heavy rainfall and a very dangerous storm tide with damaging waves and flooding are also expected.