RIO Tinto is closing its Cape Lambert and Dampier ports in Western Australia's Pilbara region to prepare for a low-pressure weather system that could become a tropical cyclone on Wednesday.
The miner said harbour masters were expected to close the Cape Lambert facility at Port Walcott and Dampier port later on Tuesday afternoon to allow ships to move outside the affected area.
"Operations are continuing at this stage, but preparations are commencing to secure port and associated coastal infrastructure ahead of expected deteriorating conditions this evening," the company said in a statement.
The Port Hedland harbour, Australia's highest-tonnage port, is also being evacuated for closure.
The last vessel will set sail from its inner harbour at 3.30pm on Tuesday.
The low-pressure system brought heavy rain overnight and on Tuesday across the region and is expected to continue into Wednesday.
The Bureau of Meteorology (BoM) estimated at 2pm (WST) on Tuesday that the tropical low was 130km northeast of Port Hedland and 305km east-northeast of Karratha, and moving west-southwest at 11km/h.
The low may develop into a tropical cyclone on Wednesday as it moves to the west just off the Pilbara coastline.
If the system reaches cyclone intensity, gales with wind gusts to 100km/h could develop between De Grey and Dampier during Wednesday and possibly extend west to Onslow on Thursday, the bureau said.
Squally thunderstorms are also expected with locally heavy rainfall.
The Department of Fire and Emergency Services has issued a blue alert - warning people to take precautions - for communities between De Grey and Mardie including Port Hedland, South Hedland, Whim Creek, Roebourne, Wickham, Point Samson, Karratha and Dampier.
A cyclone watch is also current for people in or near coastal communities from Mardie to Onslow, while the all-clear has been given to the communities of Pardoo and De Grey.
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