Residents in the path of a major blaze northwest of Sydney have been told it's too late to leave as the fire pushes closer to homes and NSW prepares for heatwave conditions in the coming week.
An emergency warning was issued on Sunday afternoon for the Gospers Mountain blaze, which is more than 378,000 hectares in size, with reports of houses being burnt.
The NSW Rural Fire Service said the fire was impacting Mount Wilson, Mount Irvine, Mount Tomah and Berambing
Embers were also falling in the Bilpin area and could start new fires ahead of the main fire front.
The RFS on Sunday advised residents in these areas that fire activity was increasing.
"It is too late to leave. Seek shelter as the fire approaches. Protect yourself from the heat of the fire," the RFS said in a statement on Sunday evening.
RFS deputy commissioner Rob Rogers said there were reports of properties being impacted and some being alight.
"Firefighters are trying to protect as many properties as they can but people in that area would see that that fire's behaviour is really tough, it's going to be a long afternoon and a long evening for people in that area," Mr Rogers told ABC TV on Sunday night.
"We're doing everything we can to protect people, but people obviously need to avoid the area."
The Bureau of Meteorology has forecast severe heatwave conditions will hit most of NSW by the end of the coming week.
Places such as Cobar, Broken Hill and Griffith will see temperatures above 40C in the coming week, the bureau has said.
With 110 fires burning in NSW, and many burning since August, the RFS is quite concerned about conditions from Wednesday onwards, Mr Rogers said.
Fire is on both sides of Bells Line of Road with concern about fires burning towards the Blue Mountains, he said.
"There's going to be a lot of work going on over the next 24 hours to try and just see what we can do to protect as many properties as we can, but people should be under no illusions - we're not going to get this fire put out - and we're going to have to get through this next week of really hot weather with these fires being very active," he told the ABC.
Watch and act alerts were also issued on Sunday for the Carrot Farm Road blaze in Deepwater, in the state's northeast, and the Green Wattle Creek fire, south of the Warragamba Dam wall in the Blue Mountains National Park.
An earlier watch and act for the Bakers Creek Road blaze in Bundarra was later downgraded to advice level.
Total fire bans are in place for Monday for the far North Coast, central ranges, New England, northern slopes and north western fire regions, with the latter four under severe fire danger.
Some 724 homes, 49 facilities and 1582 outbuildings had been destroyed so far this fire season. Six people have died and 2.7 million hectares have been scorched.
Australian Associated Press