The Department of Emergency Services issued a warning on Saturday at 10.45am (local time) for people in parts of Hope Valley and Naval Base in the City of Kwinana and City of Cockburn.
The warning covers people in an area bounded by Sutton Road to the north, Rockingham Road to the east, Lionel Road to the south and the coast to the west.
“You are in danger and need to act immediately to survive,” the warning said.
“There is a threat to lives and homes.”
The fire started near the intersection of Rockingham Road and Lussky Road in Hope Valley.
“If the way is clear, leave now for a safer place,” DFES said.
“Do not wait and see, leaving at the last minute is deadly.
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”Close all doors and windows and turn off evaporative air conditioners, but keep water running through the system if possible.
”If you cannot leave, you need to get ready to shelter in your home.
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“Go to a room in your home away from the fire front and make sure you can easily escape.
”Choose a room with two exits and water such as a kitchen or laundry.
“If you are not at home, it’s too dangerous to return.”