Fire fighters are battling some of the most severe fire conditions we have seen on the Mid-North Coast for 20 years.

The "dynamic situation" was a combination of extremely dry conditions, the number of bushfires - particularly to the west and north-west - and prevailing weather conditions.

RFS district officer Stuart Robb said there were concerns about fires spotting well ahead of the fire front.

"That is an issue when the conditions are so dry," he said.

Fire fighters are desperately hoping for a reprieve with a southerly change expected later on Friday night.

Mr Robb said the RFS is asking residents to shelter in place - at home.

"We are not asking people to evacuate," he said.

"There are fire crews on the ground and we have aircraft in place (to battle the bushfires.

"The Pacific Highway is closed in the vicinity of Frogs Road (just south of Expressway Spares) as there is a fire near that industrial area, east of the highway.

"Crews are currently working on that area.

"Again we are warning residents about the potential of ember fires," he said.

"We also urge residents to stay up do date with the current fire situation at all times.

"The Thrumster fire jumped the (Pacific) highway - it is a fairly dynamic situation at the moment," he added.

Mr Robb said residents across the Port Macquarie-Hastings will likely to be impacted by smoke over the coming days.

He said there was some good fortunate with some fires burning into the wind which is good as far as its intensity is concerned.

This will mean that there is a significant amount of smoke and the chance of ember fires though.

The RFS was also monitoring a fairly significant fire at Stockyard Flat - west of Wauchope - which is around the Forbes River area.

"The concern with that fire is that it is moving - under the current winds - in an easterly direction."

As fire fighters continue to battle bushfires on numerous fronts, there is a southerly change forecast for later in the evening on Friday.

"We are hoping that that wind change may ease some of the conditions," Mr Robb said.

"We are expecting cooler conditions, so we will get some relief from that change.

"This is also a time when people without a bushfire survival plan should get one done now.

"We also advise people to stay up to date with the current situation and to have the conversation with family members about what they will do in the event of fire impacting their property," he said.

Meteorologist with weatherzone Tom Hough said daytime maximum temperatures will drop by some 10 degrees for Saturday and Sunday, with a southerly change expected on Friday night.

Minimum temperatures for the weekend are expected to be about nine degrees - five to six degrees below the average.

Weekend maximums are likely to be around the average at 25 degrees.

Winds are expected to be around 25km/h.

Mr Hough said the forecast included smoke haze for the weekend.

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