Fire officials are working to contain and prevent the spread of the Jack and Tenderfoot fires in northern Arizona.
Fire officials say the Jack Fire, now estimated at 33,700 acres, remains active near Clint Wells.
The lightning-caused fire that started on May 29 is expected to give off moderate smoke on Wednesday thanks to windy conditions and low relative humidity.
Crews are fighting the fire in rugged terrain, working to control the perimeter and remove fuel.
At this point, the fire is 30 percent contained.
Crews say the Tenderfoot Fire has a low growth potential over the next few days as they work on the perimeters and areas not yet contained.
Eighty percent of the 4,000-acre fire is contained and no smoke was reported over the fire on Tuesday. Crews are working on managing perimeters and fire lines. They are also performing patrols for other hazards ahead of winds and high temperatures forecast for the rest of the week.
The cause of the fire is believed to be human-caused, but is still under investigation.