More than 100 Blue Mountains residents have fled to an information centre at Penrith as severe bushfire conditions worsen in the area.
Police, the Red Cross, Anglicare, The Salvation Army and staff from various government department are at the Panthers leagues club in Penrith, where on Wednesday morning about 120 people had fled townships across the Blue Mountains to register as evacuees.
Disaster welfare service planning officer Murray Nott said the team at Penrith was prepared "for the worst case scenario."
"We're hoping like all hell that we're not required," he told AAP.
Authorities have been advising people who have left their threatened properties to stay with family and friends and Mr Nott reckons that most will do so.
"Probably 80 per cent, I believe, will do that," he said.
"But if you don't have that ability to help yourself come here and we will sort something out."
He stressed that the club was being used as an information centre, not an evacuation centre.
Those arriving and needing a place to stay will be directed or taken to appropriate lodgings, Mr Nott said.
People with "greater needs" will be put up in motels and "large accommodation centres" will be used if necessary, he added.
"Red Cross will provide personal care and support," Mr Nott said.
"Anglicare help those people but they're also looking at some personal care packages for people that come out without their toothbrush or whatever and the Salvation Army are looking after catering."
Despite some rain falling on Tuesday, several communities in the Blue Mountains may come under threat on Wednesday with authorities fearing high temperatures and strong winds could cause large fires in the area to flare up.