The Rural Fire Service has conceded it is likely to face horrific conditions on Tuesday, with soaring temperatures and winds fanning bushfires burning across the Mid-North Coast.

Crews were expected to use Sunday and Monday's relatively benign conditions to shore up fire grounds in front of the deteriorating conditions.

Across the state, the fire has claimed the lives of at least three people with some 100 homes confirmed destroyed.

On Sunday, Prime Minister Scott Morrison and NSW Premier Gladys Berejiklian joined with relevant ministers and local MPs on a visit of the RFS headquarters at Wauchope.

The RFS has identified what resources are required - and these are arriving from around NSW - to be used on a number of fires that are causing concern.

There is still a lot of work to be done, said one RFS spokesperson.

Fires have been spotting up to four kilometres ahead of some fires.

The RFS is advising residents to shelter in place or to leave now, which is their best option.

RFS public liaison officer Stuart Robb says a number of fires progressed overnight Saturday, despite the efforts of numerous crews.

"The Stockyard Creek fire, Hillville Road and Crowdy Bay fires all progressed throughout the night," he said.

"However, it was minimum distance, which is a positive.

"Today (Sunday) we are focusing on areas that may come under attack on Tuesday and try to get ahead of the fires progress.

"We will also ensure the communities are kept up to date with what is happening so they can be warned and can make decisions about defending or leaving their properties.

"Ideally, we want people to leave early, find a safe refuge with friends or relatives rather than potentially face severe fire conditions.

"We are very concerned about the fire conditions that are predicted for Tuesday and we are continually looking to protecting infrastructure, assets and communications that we need to ensure that we can continue to function operationally."

Mr Robb reiterated the need to have a discussion with the family about a bushfire survival plan, to make the decision to leave early and to have a pathway out of their property.

Residents should also stay up to date via the Fires With Me app, listening to the ABC radio - the emergency broadcaster and to monitor the RFS website.

"When we put out an emergency warning we need people to adhere to those warnings and enact their bushfire survival plan," he said.

Port Macquarie MP Leslie Williams said it is important for people to be prepared for any emergency.

"Even if you live in an area that is not impacted by fire, I can't reinforce strongly enough the need to be prepared," she said.

"From the information provided to me, the RFS is pretty well prepared and is bracing for the worsening conditions early next week.

"Tuesday will be at its worst," she said.

Mrs Williams was at the Rural Fire Service headquarters at Wauchope on Sunday for the visit by the Prime Minister Scott Morrison, NSW Premier Gladys Berejiklian, deputy premier John Barilaro, minister for emergency services David Elliott, federal MPs David Gillespie and Pat Conaghan and mayor Peta Pinson.

More on the bushfire situation:

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