Firefighters and emergency crews are continuing to battle multiple bushfires ignited by more than 300,000 lightning strikes across southern Western Australia.
An emergency warning remains in place for people north of Preston National Park, in WA's South West.
The emergency warning also applies to people in parts of Glen Mervyn, Mumballup, Noggerup, and Yabberup.
A watch and act warning is in place for Noggerup, Mumballup, and other areas nearby.
The nearby blaze in parts of Beelerup, Brookhampton, and Charley Creek, on the outskirts of Donnybrook, was downgraded to a watch and act early on Wednesday.
A fire in Wellington National Park, to the north of the Donnybrook and Noggerup fires, has been downgraded.
Evacuation centres have been opened at Donnybrook and Boyup Brook for residents impacted by the fires.
Around 20 fires continue to burn at advice level in the southern half of WA after a lightning storm on Monday night sparked dozens of blazes.
Fire fight near Donnybrook
The fight against the Preston fire is expected to continue well into Wednesday night.
Around 119 firefighters and local volunteers are battling the blaze, with significant aerial support.
DFES South West Superintendent Peter Norman said crews were battling difficult conditions in tough terrain.
"A lot of fires and a lot of firefighting effort," he said.
"We're expecting a strong sea breeze and bad fire weather conditions up until about 10 o'clock tonight.
"They'll ease overnight when we will work really hard to try to contain these further."
Mr Norman said there had not been any reports of damage to infrastructure, but some cattle had died.
"We're not aware of any power outages … [but] we've had reports of some minor cattle loss, potentially 150 sheep," he said.
"We seem to be holding it quite well with air assets, but if that should impact the Donnybrook-Boyup Road, there would be significant power infrastructure there that then would affect both towns."
Sue Gray lives in Thomson Brook — between the Preston and Beelerup blazes — and said she had seen aerial support redirected to fight the Preston National Park fire.
"I can see quite a bit of smoke and the amount of planes and helicopters that went in that direction pretty much confirmed [it had worsened]," she said.
"Since yesterday, [we've] been pretty anxious. We stood on the hill and watched fires coming both ways and thought: Do we go or don't we?"
Pam Foster runs a winery in the area, and said fire came close to her property earlier on Tuesday.
"The wind changed and it just kept spreading further closer to us," she said.
"You just see the flames coming up over the trees and … it was a bit frightening.
"Fortunately there is an area that is just sand, so I think that's the reason why at this very point in time it's just smoke."
Further south, a bushfire at Bridgetown was brought under control.
Sunnyside resident Noel Holdsworth said he first spotted smoke while driving this morning.
"We spotted a lady out running around a paddock with her vehicle trying to get the cows away from the fire," he said.
"So we stayed and helped her."
Mr Holdsworth said firefighters had hit the bushfire hard.
"A couple of helicopters turned up to put water on it where the blue gums were burning, to try to keep it away," he said.
The fire started near the corner of Gommes Lane and Kingston Road in Sunnyside.
Fires close major parks, trails
The Preston National Park fire has forced the closure of the Bibbulmun Track between Marwick Road and Towers Road and the Grimwade and Noggerup campsites.
The Munda Biddi Trail is also closed.
Bibbulmun Track lead guide Steve Sertis said it was a "dangerous" time to be out on the trails and said he hoped walkers had chosen to stay away.
"We're hoping there is no-one out there, of course. Parks and Wildlife will be looking into that," he said.
"It really is the wrong time of the year to be out on the track, especially in these conditions.
"The heat and the bushfire risk … is just too great.
"At the moment the track is closed and walkers shouldn't go anywhere near it."
He said if the trail was damaged, it could remain closed for some time.
The Department of Biodiversity Conservation and Attractions' Ed Hatherley said there were 25 fires on state-managed reserves and forest alone.
He said all firefighting resources were "fully committed", though conditions were easing.
"The wind strength is still there, so we have quite a battle ahead of us," he said.
'Dry' storms spark fires
A downgraded blaze near Yarloop, which was devastated by bushfires in late 2015, started near the intersection of Meredith Road and Alexander Road.
DFES said residents who were not prepared or who were planning to leave should exit the area by heading east onto the South Western Highway.
The fires have been sparked by a broad front of electrical storms, which passed through the region overnight.
Waroona Shire President Mike Walmsley said firefighters had been out since late last night.
"A dry lightning storm like that is the worst thing you can have at this time of year,” he said.
“It's not so bad if you get a shower to follow up afterwards, but it was just a dry lightning storm which is not good."
In Donnybrook, Pam Foster said the sky was lit up by lightning.
"We think it was immediately above the house because there was no time between lightning and thunder; it was just one, one, one," she said.
"It just kept going and going and then the rain came."
