Mike Christy / Arizona Daily Star

An onlooker takes a picture of the Buster Mountain Fire as it burns in the Pusch Ridge Wilderness south of Catalina State Park. Photo taken Monday, July 13, 2015, near Oro Valley, Ariz. extra info for cutline: A lightning strike sparked a fire in rough terrain in the Santa Catalinas Monday afternoon.

The fire, which began at 3:30 p.m. in Buster Mountain, burned about 10 acres on the western end of the range, above Catalina State Park, said Heidi Schewel, a Coronado National Forest spokeswoman.

“It is in the Pusch Ridge wilderness and it is burning on the top third of the mountain in rocky terrain in a remote area,” Schewel said.

The blaze is burning in short grass with a moderate rate of spread. “We will monitor the fire through the night,” Schewel said. “The ignition was natural, and the fire is doing what it is intended to do.”

“There is rain all around the fire. It may burn out, or be put out by the rain,” Schewel said.

“We will reassess (Tuesday), and if we need to take action we will take action,” said Schewel.

Monday’s rain brought spotty rain to the area. Afternoon and evening thunderstorms were expected through the week with additional moisture from Hurricane Dolores, states the National Weather Service.

The wildfire burning in the Pusch Ridge Wilderness area of the Catalina Mountains has grown to about 200 acres, officials said Tuesday.

The fire is burning in rugged terrain and is being allowed to burn to benefit the landscape, officials with the Coronado National Forest said.

The Buster Mountain Fire was ignited by lightning Monday afternoon on Buster Mountain. It's burning grass in steep, rocky terrain that is inaccessible.

Forest officials said while the fire can be seen from homes in Oro Valley and the northwest side, no structures are threatened.

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Officials said an incident commander has been assigned to the fire and the fire and weather are being monitored closely.

Also, a smaller blaze is burning in a remote area of Redington Pass east of Tucson. It had burned about 60 acres of grass and brush. No structures are threatened and rain was expected Tuesday evening in the area.