People on islands or at sea off parts of Western Australia's northwest coast have been ordered to evacuate, as two tropical cyclones bear down

Emergency services told residents in the Exmouth Gulf coast and parts of the Gascoyne Coast to prepare for severe weather expected to arrive this afternoon and evening.

Tropical Cyclone Odette is expected to approach the far northwest of the state today.

Tropical Cyclone Seroja is expected to make landfall late tomorrow or early Monday between Carnarvon and Jurien Bay.