KITTITAS COUNTY, Wash. -- The Manastash Ridge fire is burning high-elevation forests near Shoestring Lake, about 12 miles southwest of Cle Elum.
Fire managers say no homes are threatened by the fire. It grew to 1,000 acres late Thursday - nearly doubling in size.
Firefighters said erratic winds produced by thunderstorms are fanning the flames.
The fire is moving slowly to the east along the top of Manastash Ridge. Crews say there are few roads in the rocky area which is making it more difficult to contain.
About 100 personnel are fighting the fire from the ground and the air. Officials say they plan on allowing the fire to burn to their strengthened fire lines.
Lightning started the fire along with 30 others earlier this month. All of the other fires were contained except this one and the Conrad Lake Fire.
There is no estimated containment.
The Conrad Lake Fire is holding at 1,000 acres. Fire managers say some crews are being released Saturday. It's now considered part of the Manastash Ridge Fire Complex.