Worsening weather conditions mean locals should be wary of fires reigniting in the Mount Kaputar National Park, the NSW Rural Fire Service (RFS) says.
RFS Superintendent Michael Brooks said the weather started to deteriorate on Thursday morning which caused "a couple of trees to start to smoke up".
But Superintendent Brooks said the fire ground was still being monitored by NSW National Parks and Wildlife crews to ensure the smoking trees did not worsen.
"The parks guys have been monitoring it all day but they are experiencing quite a few trees starting to reignite, but we don't expect any problems from them because they're well contained," he said.
"Conditions aren't favourable but hopefully they'll ease over the weekend."
The superintendent said lately fires had been "very hard to extinguish".
"We take them down with water and they reignite quite quickly," he said.
"Extreme dry conditions across the area means people have to be very aware."
Gunnedah, Tamworth and the Liverpool Plains area have an extreme fire danger rating and a total fire ban for Friday, while Narrabri has a high fire danger rating.
More information on fire danger ratings can be found on the RFS website.