With over 70 fires already burning across the state, the New South Wales Rural Fire Service warned that it would not be able to contain them all before the weather worsened.
The fire at Glen Innes saw 164 inmates evacuated from Glen Innes Correctional Centre to Grafton Correctional Centre on Saturday morning due to bushfire risk to the prison, Corrective Services said.
Fires would be extremely hard to control if they spark in parts of regional WA, where the mercury is forecast to climb to about 40C.
He said dozens of fires are still at risk of affecting properties on Saturday.
One man was found inside a burned-out auto on Saturday morning while a woman died in hospital after fire fighters found her suffering severe burns overnight.
The blazes were so intense and unsafe the NSW Rural Fire Service yesterday issued a warning to the public to avoid being caught in the open because the bushfires were creating their own weather system.
"The devastating and horrific fires that we have seen, particularly in New South Wales but also in Queensland, have been absolutely chilling", Morrison said.
"Tomorrow's hot conditions could make it hard for firefighters to supress a fire should one start, therefore we are asking people to take heed of the Total Fire Ban conditions", said Country Fire Authority State Duty Officer John Katakouzinos.More news: Statistics Canada: B.C. unemployment rate best in country
Unprecedented bushfires in NSW have claimed the lives of two people, amid fears there could be more fatalities as blazes rage across the state's north and mid-north regions.
Mr Clark said that around the Sydney area, they were "really concerned" about the urban fringe.
"It was pretty scary", Mr Stewart said.
"We've just heard that a member of the community who was treated on scene last night for several hours, found badly burned, the reports were of 40 to 50 per cent of her body".
They were also in discussions with the Australian Defence Force.
A woman who was found on Friday unconscious and with serious burns near Glen Innes has died in hospital.
The annual Australian fire season which peaks during the Southern Hemisphere summer has started early after an unusually warm and dry winter.
A vast bushfire that's claimed almost 20 homes in central Queensland is now bearing down on more.More news: See the Transit of Mercury
Authorities in eastern Australia have warned of "catastrophic fire danger" in the coming days, as firefighters attempt to bring major bush fires under control.
Sixteen structures, including homes and sheds, have been damaged or destroyed by the Cobraball fire but there has been no loss of life.
Nineteen schools on the mid-north and north coast were forced to close yesterday, and motorists were stranded as the Pacific Highway was shut down in both directions between Taree and Bulahdelah and at Port Macquarie.
Acting Fire Commissioner Mike Wassing said their focus on Sunday was on Cobraball near Yeppoon.
Five people were listed by authorities as missing on Saturday afternoon, but local media said Sunday they had now been accounted for.
Some firefighters have suffered heat exhaustion, one broke a leg and another had an ankle injury.
As of 12:30 a.m. local time, 74 brush fires are burning across NSW, from Brisbane to Sydney, with 43 out of control, according to the NSW Rural Fire Service. "We've got winds blowing, they're circling, it's like a cyclone".More news: Lions QB Stafford's status vs. Bears in doubt