Two people have been injured and two homes have been destroyed by a fire at Chepstowe west of Ballarat in central Victoria.
Firefighters have now contained the blaze, which broke out late this afternoon and burned through 1,100 hectares.
Fire Services Commissioner Craig Lapsley says two people have been taken to the Ballarat hospital with burns to their arms and face.
"They were in a car trying to get away and in the end they tried to seek refuge at a local dam," he said.
"Serious injuries, but not life-threatening."
Mr Lapsley say people are being encouraged to leave the Lake Burrumbeet Caravan Park.
"It's not an evacuation as such, but obviously in caravans and tents it's a very uncomfortable position to be in with the smoke," he said.
"There's no direct threat of fire, but we're very conscious that we don't want any spot fires to be near the caravan park, so that's a focal point for Victoria Police."
The Country Fire Authority's (CFA) regional controller Don Kelly says firefighters are still trying to work out how many houses have been destroyed.
"Certainly there are a number of houses which have been burnt, however we are yet to validate the numbers and locations of those, that's something we are just getting ourselves organised for now, but there will be a number of houses and buildings that have been lost," he said.
Incident controller Jon Rofe says firefighters do not expect the fire to get much bigger tonight.
"There's quite a cool south-westerly breeze blowing through now, we've actually even had a few spots of very light rain," he said.
"Those weather conditions have helped the fire behaviour abate quite dramatically, to the extent where firefighters have been able to be very aggressive in the last hour or so in their attack on the fire."
The Western Freeway is closed between Ballarat and Ararat.
The CFA has also issued a watch and act message for Cardigan, Cardigan Village, Windermere and Bo Peep.
There is also a watch and act message in place for the area south-east of Goroke in the state's west.
A 900 hectare bushfire is out of control and spotting into grassland.
The CFA says people in the Gymbowen, Mitre, Tooan areas need to stay vigilant overnight.
A relief centre has been set up at the Horsham Town Hall.
Firefighters have also contained a grass fire that threatened properties in part of Sunbury, north-west of Melbourne.
Elsewhere, a large bushfire is still burning out-of-control in the state's south-west.
The Kentbruck fire west of Portland has burned 9,000 hectares near Drik Drik and a watch and act message remains in place.
Roads are closed and about 500 firefighters are working on the blaze.
The Country Fire Authority's (CFA) chief fire officer Euan Ferguson says freshening south-westerly winds of up to 40kph are a concern.
"That's going to put smoke over the Princes Highway, Dartmoor, Digby and Heywood," he said.
"Obviously we'll jump on any outbreaks as they occur."
He says firefighters are working in difficult conditions.
"There are both pine and blue gum plantations, grazing land, national park, some areas of public land which are difficult to get access to," he said.
"Much of the area down there is very swampy.
"They've had trouble bogging both bulldozers and vehicles."
Elsewhere, the CFA has issued a watch and act message for the area south-east of Goroke in the state's west.
The authority says the 75 hectare bushfire is out of control and creating spot fires.
The fire is expected to affect Goroke, Gymbowen and Tooan within the next four hours.
The CFA has contained a grass fire that threatened properties in part of Sunbury, north-west of Melbourne.
Firefighters were worried it could affect the back of houses between Baggy Green Street and Vineyard Road near the Calder Freeway.
Northern fire threat
The other focus of the fire threat in Victoria is in the state's north, where there are total fire bans in the Mallee, Wimmera, Northern Country and North-East districts.
Temperatures north of the divide are still around 40C and there are fears lightning in New South Wales will move across the border and start new fires in Victoria, around Corryong.
Extra trucks have been sent up the Hume Highway to the Bendigo, Wangaratta and Corryong areas.
The Elvis sky crane has been sent to Wangaratta and another firefighting helicopter will be based at Benalla.
Mr Ferguson says Victorian crews plan to support New South Wales firefighters all the way to Canberra.
"We'll be moving some of our heavy aircraft resources more northward in case we need to support new fires in Victoria or even supporting our counterparts in New South Wales," he said.
"The rule we use is to hit it hard and hit it fast, particularly hitting those fires with a combined ground and aircraft resource."
In residents are being warned to prepare for one of the most serious fire threats in history with conditions rated as catastrophic.