Oklahoma City firefighters battled three fires across the city Saturday afternoon.
A grass fire at 7533 Embassy Terrace threatened nearby structures. The fire was put out shortly after it was reported about 4 p.m.
Firefighters also were at grass fires Saturday at 14912 Jefferson Lane and 11600 S Luther Road.
The Luther Road fire was in a heavily wooded area and took several hours to extinguish because crews had difficulty getting to the flames.
Grass fires also were reported Saturday in northeastern Oklahoma.
The Oklahoma Highway Patrol shut down State Highway 20, west of Skiatook, for about an hour and 45 minutes because of smoke blowing across the roadway. It was reopened shortly before 6 p.m.
Because of low humidity, warm temperatures and strong winds, the National Weather Service in Norman issued a red flag fire warning across the northwest half of Oklahoma, remaining in effect until 6 p.m. Sunday.
The fire danger warning also extends into east-central areas of the state.
Four counties also have issued burn bans — Canadian, Cotton, Pittsburg and Stephens — because of the conditions.