MONO COUNTY, Calif. — A fast-moving wildfire in a picturesque California county along the Nevada state border has damaged 15 structures, prompted evacuations and forced the closure of part of a highway on Thursday as firefighters worked to contain it in the face of strong winds.

The Pack Fire in Mono County, about 140 miles southeast of Sacramento, had grown to about 5.3 square miles by Thursday night and was burning without any containment, according to the California Department of Forestry and Fire Protection, or Cal Fire.

The blaze had been whipped up by gusts as strong as 50 miles per hour that temporarily grounded emergency aircraft, according to Cal Fire. But by Thursday evening, the department said in a statement, “Fire activity has decreased due to precipitation in the area.”

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