Out-of-control bushfires continue to put lives and homes at risk as fire rages in bushland south-east of Perth.
Parts of Serpentine, Jarrahdale and Keysbrook have been upgraded to a Bushfire Emergency Warning with residents warned to "act immediately to survive".
The emergency warning is in place for people bound by Scarp Road and Day Road to the north, Kingsbury Drive to the east, Scarp Road to the west and Karnet Prison Farm to the south, excluding the Jarrahdale townsite.
Homes within the emergency warning area are under threat.
If the way is clear residents are being advised to leave now for a safer place. If they cannot leave, they should get ready to shelter in their homes.
A watch and act warning is also in place for residents bound by Kingsbury Drive to the west, Jarrahdale Road to the north, Albany Highway to the east and the southern point of the Serpentine Reservoir to the south, including the Jarrahdale townsite and Mount Cooke.
The Serpentine blaze started during lightning storms near the Serpentine Dam on Saturday, about 55km south-southeast of Perth, and as of Sunday is estimated to cover 2000 to 3000 hectares of land.
Emergency WA says unpredictable conditions on fire grounds across the state mean there is a risk to lives and homes.
"It is particularly difficult terrain, and there is a large amount of fire on the ground, so we do have concerns over the next two or three days," Department of Fire and Emergency Services WA commissioner Darren Klemm told reporters.
There were reports of property damage and rapid assessment crews had been deployed to confirm, he said.
"At the moment, we haven't had any reports of homes being lost totally or even damaged, most of the reports we've had is about outbuildings like sheds and those sorts of things," he said.
Hundreds of firefighters are positioned across WA with crews hoping cooler conditions will bring relief in coming days.
"We've got a good four-to-five days now of more stable, milder weather conditions which is going to give us a great opportunity to get around these fires and make them safe," Mr Klemm said.
The Parks and Wildlife Service closed Serpentine National Park due to fire and people already in the area were told to leave for a safer place.
The WA government has called in a C-130 Hercules Water Bomber from NSW to help control multiple fire fronts.
A Bushfire Emergency Warning in place for parts of North Dandalup, Myara and Whittaker in the Shire of Murray where 80 hectares have been burnt, has been downgraded to watch and act.
More than 50 firefighters from the Bush Fire Service, Parks and Wildlife Service, and Volunteer Fire and Rescue Service have been working to bring that fire, also started by lightning, under control.
Evacuation centres have been set up at Murray Aquatic Centre and Serpentine Jarrahdale Community Recreation Centre.
A community meeting at the Serpentine evacuation centre took place on Sunday afternoon to update residents about when they would be able to return to their homes.
An evacuation at Mandurah Aquatic and Recreation Centre has since been closed.
Temperatures in Perth peaked at 35C on Saturday and reached a high of 26C on Sunday.
High fire danger ratings will remain in place for 21 districts across WA on Monday.
