A blaze flared on Wednesday night with fire threatening homes in Carboor after breaking containment lines created near power lines which separate pine plantations and forested areas in the Buffalo River region.

An emergency warning was issued for residents in the Bobinawarrah, Carboor, Kneebones Gap, Whorouly, Whorouly East, Whorouly South areas with residents in Whorouly South told they could be impacted by fire before being downgraded to watch and act around 8am on Thursday.

Thick smoke again blanketed Whorouly with cafe owner Jennifer Garrett revealing she has opted to wear a mask on her daily mail run and has masks available for locals who require them.

"Some of the elderly have already evacuated, but smoke is the biggest problem," she said.

"Any visitors to the area have gone, but Whorouly is not a big tourist town.

"But the elderly, who haven't got access to the internet or whatever, come in and want to know what is going on."

A CFA volunteer from Whorouly South, who got called out on Wednesday night, said the fire jumped containment lines when the wind sprung up.

"It got into the hardwood with ember attack," he said.

"There is pine plantation on the other side and that is where it sparked into on Sunday.

"They were very erratic winds and quite strong.

"They were forecasting a little bit of wind and it didn't come from one constant direction.

"It can be calm here, but right up in the head of the valley it can come from different directions."

CFA senior station officer Craig Houlahan confirmed the fire reached the edge of Carboor.

"Crews worked through all night on active fire to prevent any outbreaks," he said.

"It's virtually burnt right up to the homes."

The blaze flared up about 10.20pm and burnt through 150 hectares before being contained.

Temperatures in the Ovens Valley are forecast to hit 40 degrees today before a late change.