The mayor of Glen Innes, where two people died, said residents were traumatised and still coming to terms with their losses.
One blaze cut a destructive path through this community near Taree.
"Not only will they be worse, they will be concentrated much further than just the north-eastern area of NSW".
"I was the last one to speak to her". That victim died in a fire hundreds of miles from Glen Innes. "She was in absolute panic", Chrystal Harwood said.
"We will be wanting as many firefighters available and on stand-by tomorrow".
At one point on Friday, 17 emergency-level fires were burning simultaneously across NSW.
Firefighters had described the conditions yesterday as "difficult" and "dangerous".
Mr Fitzsimmons said along with the 1300 firefighters on the ground right now from across Australia and New Zealand, they were in contact with colleagues from Canada and the U.S. for possible help in light of Tuesday's predicted forecast.
"Widespread areas of severe and extreme fire danger".
In Queensland, more than 1,200 firefighters were battling 51 active fires across the state on Sunday, with 39 aircraft deployed to assist for the first time ever in the state.
Thousands of residents in the state's north were forced to flee for their lives, and multiple buildings, including a school at Bobin, in the northwest, are believed to have been destroyed. "Firefighters are unable to prevent the fire advancing". The fires were visible from space by NASA's satellites.
The view down Crown St in Harrington, looking down towards Murray St, where there is a serious threat to property.
RFS Comissioner Shane Fitzsimmons says every resource and pair of boots on the ground will be needed to deal with Tuesday's catastrophic conditions.
Pyrocumulous clouds can produce dry lightning.
An inferno consumes a home near Taree on the NSW mid-north coast.
Chilling video posted on social media shows homes on fire and scenes of orange and smoke engulfing front yards.
Last year, a United Nations report said Australia was falling short in efforts to cut its Carbon dioxide emissions.
Mr Annetts said his neighbour was distraught at his home being razed but was relieved his beloved chickens and their coop had somehow managed to avoid being annihilated. "We can not overstate the flammability of the fuel given the current drought", he said. Local radio stopped normal programming and provided instructions about how to try to survive fires if trapped at home or in a vehicle.
"No matter where you are ... everybody has to assume the worst and we can not allow complacency to creep in".
"There is no rain, there is no forecast of rain, there is no prospect of any meaningful rain so we could be in this fight now for a number of weeks".
Temperatures are cooler than yesterday, with Port Macquarie forecast to reach 24C.
"We have 90 fires across New South Wales".
Population estimates for koalas, native to Australia, vary widely, from as few as 50,000 to little more than 100,000.