A hard-charging brush fire erupted in northern Los Angeles County on Wednesday, hustling through 5,054 acres of terrain so far, aided by heavy, dry brush and pushed by gusting Santa Ana winds, Cal Fire officials said.

Amid an extended red flag warning, a new fire exploded north of Castaic. Evacuations were ordered after 11 a.m. Wind gusts reached 31 mph Wednesday afternoon in the area and are expected to increase over the next several hours.

A large brush fire that erupted near Interstate 5 in Castaic has burned more than 9,000 acres, causing several evacuation orders and warnings Wednesday morning.