More than 100 personnel had been deployed during a break from northeasterly winds on Sunday evening which had hampered efforts to control the blaze.

As of 11am on Monday, more than 3000 hectares had been burnt in the Curembenya area of the Goobang National Park.

VIDEO: NSW Rural Fire Service’s aerial footage of the blaze ...

Canobolas Zone RFS Inspector Brett Bowden said crews were acting quickly to undertake backburning efforts, with a hope of having the blaze under control by Monday afternoon.

“Now that the wind has dropped we are in the window where we can get the work done,” he said.

With lightning on Saturday the likely cause of the fire, Mr Bowden said the crews were hoping predictions of thunderstorms on Monday evening wouldn’t eventuate.

MAP: where is the fire burning ...

“If they do that will hamper our operations,” Mr Bowden said.

Five aircraft performed aerial drops on the flames in the top valley of the National Park on Monday and the western side of the area around Curembenya in efforts to extinguish the flames.

Mr Bowden said – weather permitting – crews hoped to have the fire under control by Monday afternoon or lunchtime Tuesday.

Canobolas Zone RFS has worked alongside Mid Lachlan Valley RFS and NSW National Parks and Wildlife Service since Saturday morning to extinguish the fire, which does not present any threat to property.

There were two other small fires in the northern section of Goobang National Park on Saturday afternoon, both of which were quickly contained.