A tropical cyclone is likely for Western Australia’s northern coast this weekend, with possible 100km/h winds to hit the Kimberley.

The Bureau of Meteorology (BoM) issued a cyclone warning for coastal areas from Kuri Bay to Broome on Friday, and also a cyclone watch alert from Broome to De Grey.

The BoM said a tropical low to the north of Broome was expected to form into a tropical cyclone on Saturday.

The system is expected to intensify over the weekend as it tracks southwest towards the Pilbara coast on Monday.

The Port Hedland Port Authority said the Pilbara iron ore export hub was expected to be hit by gales from late Sunday night, so port evacuations should start from Saturday afternoon.