A bushfire that was threatening lives and homes and the Pearce Royal Australian Air Force base in Bullsbrook, north-east of Perth, has been downgraded to a watch and act.
The alert applies to people in an area bounded by Chittering, Morrissey, Neaves, Rutland and Stock roads, which includes RAAF Base Pearce, about 45 kilometres north-east of Perth.
People in the area are being advised to leave now if the way is clear if they are not prepared to defend their homes.
The bushfire is moving in a north-easterly direction after starting near Almeria Parade and was reported to authorities at 12:30pm.
Motorists are asked to avoid the area as a lot of smoke is causing a hazard for driving.
The fire remains out of control and unpredictable, and embers are being blown ahead of the fire front.
The RAAF Base Pearce is the only RAAF airfield of its kind on the west coast of Australia and is being used as the WA base for the large air tanker firefighting aircraft during the bushfire season.
It is also used by the Republic of Singapore Air Force, which has a squadron based there.