“Extreme fire behavior” caused a blaze south of Eagle to double in size Sunday, just hours after it ignited.

Evacuations were ordered Sunday afternoon for Sylvan Lake State Park, Yeoman Park, Lede Reservoir and Crooked Creek Pass in Western Colorado as 60 firefighters, four single-engine air tankers and a light helicopter worked the blaze, reported around 3:15 p.m. two miles southwest of Sylvan Lake in Eagle County.

The fire was estimated at 90 acres around 6 p.m. and had grown to 180 by nightfall, according to a U.S. Forest Service news release.

The cause of the fire is currently unknown, the service stated.

Ground and aerial crews from Greater Eagle Fire Protection District, Eagle River Fire Protection District, the U.S. Forest Service, Vail Fire and Pitkin County responded. The Eagle County Emergency Operations Center was activated at 4:45 p.m. Sunday.

Residents are asked to avoid the area to allow evacuation traffic to exit and emergency vehicles to enter. Sylvan Lake Road and Brush Creek Road have been closed.

The fire comes as Eagle County was placed under a red flag warning from noon to 9 p.m. on Saturday and Sunday due to high winds and dry conditions. During the red flag warning, stage two fire restrictions are in place.

Temperatures in the area reached around 90 degrees Sunday with 8% humidity and up to 37 mph wind gusts, according to AccuWeather.

On Saturday, a news release from the Eagle River Fire Protection District said fire danger was “extreme” in the county and an additional severity engine would be staffed over the weekend.