Overnight wind changes are expected to hamper efforts to contain the fire, Incident Controller David Gill warned.
“That’ll put some pressure on the western end of the fire edge and may push the fire closer to the coast later this evening,” he told 9News.
Emergency crews spent most of Friday battling the blaze, which started around 8.30am near Rockingham, deploying a large waterbomber Hercules to drop retardant in an attempt to stop the spread of the fire.
The Department of Emergency Services initially issued a warning around 10.45am local time (1.45pm AEDT) and that remains in place at 9.50pm local time (12.50am AEST).
An evacuation centre at Success Regional Sports Centre has closed but some Kwinana residents are being told to leave now if the way is clear.
“You are in danger and need to act immediately to survive,” the latest Emergency WA warning says.
Sydney skies darkened, a warning of the sudden storm to come
It covers the area for people bounded by Wattleup Road to the south, Cockburn Road and the coast to the west, Gemma Road and Caratti Road to the north and Moylan Road to the east in parts of Henderson and Wattleup.
Several road blocks are in place and smoke may impact driving conditions.
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