Crews contained a brush fire northeast of Lakewood Estates in Amado on Wednesday that one agency put at about eight acres and another at 41.
Meanwhile, a quarter-acre brush fire broke out in Sahuarita along Interstate 19 north of Sahuarita Road that also was contained.
Crews got the upper hand on the Amado fire about 5 p.m., five hours after it broke out. No structures were damaged and there were no injuries in what was called the "Airstrip Fire," according to the Green Valley Fire District.
Crews from GVFD, Elephant Head, Arivaca Fire, Tubac, Rio Rico and the U.S. Forest Service were on the fire west of I-19 at one point. A GVFD spokesman said wind was a concern, and crews were mopping up Wednesday evening.
Thursday will bring a red flag warning, which means specific heat, humidity, wind and dry conditions combine to make conditions ripe for a fire.
The slow-moving fire burned dry grass and mesquite trees and eventually headed away from structures. Crews had launched burnout operations around structures to increase defensible space around them, according to GVFD.
The cause of the fire has not been determined, but may have resulted from a controlled burn or an illegal burn that grew out of control, the spokesman said. There were no evacuations, though homes north of the fire's path were put on notice.
Air assets were utilized to set a hard perimeter around the fire and put the size at eight acres, according to GVFD. Arizona Department of Forestry and Fire Management put the size at 41 acres after an official walked the perimeter.
About three hours after the Airstrip Fire, a quarter-acre brush fire broke out along I-19 just north of Sahuarita Road. The southbound off-ramp to Sahuarita Road was closed for about an hour while firefighters fought the blaze, which was out about 3:45 p.m. No cause was pinpointed, but a Rural/Metro Fire spokesman said it was a reminder to drivers to make sure they don't drag chains or do anything that could spark dry grass.
DPS and Sahuarita police helped with traffic control.