RFS Namoi-Gwydir takes control of Bobbiwaa Creek fire burning near Mount Kaputar between Narrabri and Bingara

The Bobbiwaa Creek fire has now burnt out more than 4100 hectares including part of the Mount Kaputar National Park.

The fire has been raging since February 12 when it broke out in sweltering conditions and quickly spread, fanned by hot winds and temperatures that nudged 40 degrees.

The Rural Fire Service Commissioner declared the fire a Section 44 blaze allowing for out-of-area crews from across the state to be deployed to back-up exhausted firefighters.

Namoi-Gwydir RFS Inspector Angela Daley told Fairfax Media the relative humidity and drop in temperatures had helped crews.

“The relative humidity and the bits and pieces of rain over the weekend and Monday, that's definitely helped to slow the fire down,” she said.

“We do have a handful of hot spots still burning.

“We're now using the water bombing helicopters to focus on those spots.”

The fire was brought under control earlier this week, after crews worked through total fire bans and sweltering conditions to build containment lines.

On Wednesday, local firefighters were rested and National Parks crews took to the fireground. The visiting RFS volunteers were also sent home, Inspector Daley said.

“We have predominantly National Parks officers out in the field [on Wednesday],” she said.

“While the fire is under control, we'll have crews out there to continue patrolling it.

“They’re putting in some strategic burns in the Mount Kaputar corner so we’lll wait and see but the forecast conditions should assist us.”