Authorities in eastern Australia have warned of "catastrophic fire danger" in the coming days, as firefighters attempt to bring major bush fires under control.
At least three people have been killed in the fires in recent days, with several other people remaining unaccounted for.
More than 70 blazes are still burning across New South Wales and more than 150 homes have been destroyed.
Evacuation orders have also been issued in parts of Queensland.
Officials are expecting the fires to spread quickly and more lives could be in danger.
A major warning has been issued for the Greater Sydney and Hunter areas on Tuesday due to "worsening weather conditions" including high temperatures and strong winds.
Sydney and Hunter regions to experience Catastrophic fire danger on Tuesday. Many areas will face dangerous bush fire conditions. Based on latest forecasts, this is the expected fire danger ratings for Tuesday. Plan now. #nswrfs #nswfires #catastrophic pic.twitter.com/KC1oW72n2k
— NSW RFS (@NSWRFS) November 10, 2019
Officials said it's the highest level of bush fire danger, noting that lives and homes will be at risk.
'Extreme' and 'severe' warnings have been issued for other parts of the state.
The New South Wales rural fire service said: "These fires will not be contained in time and will threaten lives and properties.
"This is the first time since new Fire Danger Ratings were introduced in 2009 that Catastrophic fire danger has been forecast for Sydney."
Meanwhile, efforts are continuing to bring the existing blazes under control.
This shows the dangerous conditions that have confronted firefighters and residents today. This is the crew from Warringah HQ at the Hillville fire near Taree. #nswrfs #nswfires pic.twitter.com/lIhnF8P1Qf
— NSW RFS (@NSWRFS) November 8, 2019
Speaking yesterday, Australian Prime Minister Scott Morrison said the wildfires are "simply terrifying".
He is appealing to people in New South Wales and Queensland to listen to emergency services and 'stay safe'.
Mr Morrison says conditions are likely to remain the same for some time.
However, speaking at an evacuation centre yesterday, he added: "I've got to tell you as a prime minister I'm never more proud of Australians than in moments like this.
"They just show incredible spirit, incredible heart, incredible generosity."