SYDNEY — Firefighters battled scores of wildfires raging across southeast Australia on Tuesday with officials evacuating national parks and warning that blistering temperatures and high winds had led to "catastrophic" fire conditions in some areas.

Thousands of firefighters were on standby across the nation's most populous state of New South Wales, where fire authorities said wildfire conditions were at catastrophic threat levels – the most severe rating available – in parts of the state. All state forests and national parks were closed as a precaution and total fire bans were in place with temperatures expected to reach 45 degrees Celsius (113 Fahrenheit) in some areas.

"We are shaping up for one of the worst fire danger days on record," New South Wales Rural Fire Service Commissioner Shane Fitzsimmons said. "You don't get conditions worse than this. We are at the catastrophic level and clearly in those areas leaving early is your safest option."

No deaths had been reported, although officials in Tasmania were still trying to find around 100 residents who have been missing since a fire tore through the small town of Dunalley, east of the state capital of Hobart, last week, destroying around 90 homes. On Tuesday, police said no bodies were found during preliminary checks of the ruined houses.

Wildfires have razed 20,000 hectares (50,000 acres) of forests and farmland across southern Tasmania since Friday.

More than 100 fires were blazing across New South Wales on Tuesday, though only a handful of homes were under threat as of early afternoon. Officials were bracing for winds up to 80 kilometers per hour (50 miles per hour) later in the day that could fan the flames in unpredictable directions.

One volunteer firefighter suffered severe burns to his hands and face while fighting a grass fire near Gundaroo village, about 220 kilometers (138 miles) southwest of Sydney, the New South Wales Rural Fire Service said Monday. He was flown to a hospital in Sydney for treatment.

Wildfires are common during the Australian summer. In February 2009, hundreds of fires across Victoria state killed 173 people and destroyed more than 2,000 homes.

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  • In this photo provided by the New South Wales Rural Fire Service a wildfire near Deans Gap, Australia, crosses the Princes Highway Tuesday, Jan. 8, 2013. (AP Photo/NSW Rural Fire Service, James Morris)

  • In this Jan. 4, 2013, photo provided by the Holmes family, Tammy Holmes, second from left, and her grandchildren, two-year-old Charlotte Walker, left, four-year-old Esther Walker, third from left, nine-year-old Liam Walker, eleven-year-old Matilda, second from right, and six-year-old Caleb Walker, right, take refuge under a jetty as a wildfire rages near-by in the Tasmanian town of Dunalley, east of the state capital of Hobart, Australia. (AP Photo/Holmes Family, Tim Holmes)

  • In this Jan. 4, 2013, photo provided by the Holmes family the Walker siblings six-year-old Caleb, left, four-year-old Esther, second from left, eleven-year-old Matilda, holding two-year-old Charlotte, second from right, and nine-year-old Liam, right, prepare to enter the water to take refuge with their grandparents under a jetty as a wildfire rages nearby in the Tasmanian town of Dunalley, east of the state capital of Hobart, Australia. (AP Photo/Holmes Family, Tim Holmes)

  • In this Jan. 4, 2013, photo provided by the Holmes family, a building burns near a jetty where Tim and Tammy Holmes attempt to shelter their five grandchildren as a wildfire rages nearby in the Tasmanian town of Dunalley, east of the state capital of Hobart, Australia. The family credits God with their survival from the fire that destroyed around 90 homes in Dunalley. (AP Photo/Holmes Family, Tim Holmes)

  • In this Jan. 4, 2013, photo provided by the Holmes family, the Walker siblings six-year-old Caleb, left, four-year-old Esther, second from left, nine-year-old Liam, and eleven-year-old Matilda, right, holding two-year-old Charlotte, prepare to enter the water to take refuge with their grandparents under a jetty as a wildfire rages nearby in the Tasmanian town of Dunalley, east of the state capital of Hobart, Australia. (AP Photo/The Holms Family, Tim Holmes)

  • Burnt trees from the Deans Gap fire are shown near Nowra on the south coast of Australia's New South Wales state on January 9, 2013. Cooler conditions helped firefighters battling blazes across Australia on January 9 but up to 30 were still out of control. (GREG WOOD/AFP/Getty Images)

  • A firefighter douses smouldering trees from the Deans Gap fire near Nowra on the south coast of Australia's New South Wales state on January 9, 2013. Cooler conditions helped firefighters battling blazes across Australia on January 9 but up to 30 fires were still out of control. (GREG WOOD/AFP/Getty Images)

  • Firefighters douse burning logs from the Deans Gap fire near Nowra on the south coast of Australia's New South Wales state on January 9, 2013. Cooler conditions helped firefighters battling blazes across Australia on January 9 but up to 30 were still out of control. (GREG WOOD/AFP/Getty Images)

  • John O'Reilly takes refuge in the cool water behind a waterfall of a fountain in central Sydney, Australia, Tuesday, Jan. 8, 2013, as the temperature reaches 42 degrees Celsius (107.6. degrees Fahrenheit). Temperatures across much of New South Wales state are expected to reach 45 degrees Celsius (113 degrees Fahrenheit) creating severe wildfire conditions. (AP Photo/Rick Rycroft)

  • This aerial photograph taken on January 5, 2013 shows the devastated town of Dunalley after bush fires swept through the area. (Chris Kidd/AFP/Getty Images)

  • This aerial photograph taken on January 5, 2013 shows the devastated town of Dunalley after bush fires swept through the area. (Chris Kidd/AFP/Getty Images)

  • This aerial photograph taken on January 5, 2013 shows the devastated town of Dunalley after bush fires swept through the area. (Chris Kidd/AFP/Getty Images)

  • This aerial photograph taken on January 5, 2013 shows the devastated area Boomer Bay after bush fires swept through the area. (Chris Kidd/AFP/Getty Images)

  • This aerial photograph taken on January 5, 2013 shows Westpac Police Rescue Helicopter crewman Sgt. Matthew Drumm surveying the devastated town of Dunalley after bush fires swept through the area. (Chris Kidd/AFP/Getty Images)