Crews battle 15-acre grass fire near Highway 4 in Concord

Crews have stopped forward progress on a 10 to 12-acre vegetation fire on the side of eastbound state Highway 4 in Concord on Thursday afternoon, according to the Contra Costa County Fire Protection District.

The blaze was reported at 1:09 p.m. alongside Highway 4 just east of Willow Pass Road.

The forward progress had been stopped as of an hour later, but fire crews remain at the scene.

County fire officials wrote on Twitter that the blaze is the largest of the season to date and "an early indicator of what is to come with Red Flag conditions this weekend."