Australia iron ore hub braces for strongest cyclone in a decade

The storm is expected to make landfall late on Thursday or early on Friday with winds of up to 315 km per hour (196 mph) at its core, the Bureau of Meteorology said.

"They've got a lot of strength in them, the ability to not only destroy trees and knock down power lines but lift up those loose items in the yard, including trailers and caravans," meteorologist Miriam Bradbury told ABC television.

The weather bureau said in its latest update that Ilsa could impact a 600 km sparsely populated stretch from just north of Port Hedland eastwards to just south of tourist town Broome.

Port Hedland's port, the world's biggest iron ore export point, closed on Thursday morning after the port authority began clearing berths a day earlier.

The port is used by BHP Group (BHP.AX), Fortescue (FMG.AX) and billionaire Gina Rinehart's Hancock Prospecting. Rio Tinto (RIO.AX) exports out of the Port of Dampier, to the west of Port Hedland.

The weather bureau issued a Red Alert for Port Hedland on Thursday afternoon, where wind gusts up to 155 kph are expected.

Its 15,000 residents, most of whom are mining company employees, were advised to seek shelter indoors away from doors and windows.

It will be the strongest system to hit the country's far northwest region since Cyclone Christine crossed the coast in December 2013, weather bureau forecaster Jessica Lingard said.

BHP said it was closely tracking the cyclone but its mining and rail operations were continuing.