VERNON, Ariz. (AP) — A wind-whipped wildfire is burning in northeastern Arizona about halfway between Springerville and Show Low and has grown to more than 1.5 square miles.

The San Juan Fire was reported about noon Thursday southeast of the small community of Vernon.

Apache County officials say the wildfire had charred about 100 acres by 2 p.m. and grew quickly, fanned by wind gusts of 33 mph.

Authorities say the cause of the fire is under investigation.

Bureau of Indian Affairs Forestry and Wildland Fire Management officials say the wildfire is moving in a north-easterly direction into the Apache Sitgreaves National Forest, where thinning projects could slow the blaze.

County officials say residents in the areas of Red Cabin Ranch, Whiting Homestead and Green Peaks Hideaway are on a non-mandatory pre-evacuation notice.