A small wildfire that started last Wednesday in the Catalina Mountains has flared up again and grown to about 150 acres, officials said.

The Finger Rock Fire is in an inaccessible location near Pontatoc Canyon, said Heidi Schewel, a Coronado National Forest spokeswoman. 

The fire was started July 29 by lightning but was dampened by storms. The fire smoldered but erupted as the vegetation dried out.

Smoke is expected to go into the low-lying areas Wednesday night into Thursday, and Schewel warned that "people should stay indoors."

Rain is predicted Friday afternoon and evening, which "should help control the fire," Schewel said. She said officials are monitoring the blaze, but are ready to fight the fire if needed. 

The fire is burning brush and grass and is not threatening any structures, according to authorities.

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Officials have closed Finger Rock Trail No. 42 to the public because of the increase in fire activity.

Get the latest updates on the fire from social media below:

#FingerRockFire is visible this afternoon on the Catalina Mountains near Pontatoc Canyon at about 5000 feet in...

Posted by US National Weather Service Tucson Arizona on Wednesday, August 5, 2015

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Carmen started at the Star in 1981 and covers the aging population. She wrote “Mama’s Santos: An Arizona Life”, a book about the Mexican and Mexican-American experience in the Southwest through stories about her family. It won 11 awards.