Updated: 5:58 p.m. July 31

First discovered: 4 hours ago, 1:40 p.m. July 31

Initial location: San Diego County, Calif.

Fire type: Wildfire

Fire name: Grade

Grade Fire initially started today at 1:40 p.m. in San Diego County, California.

After being active for four hours, it has burned 170 acres of private land, an increase of 91 acres since the last update. There is currently no information on the containment of the fire and its cause remains unknown.

Source: National Interagency Fire Center