Dubbed the Canyon Fire, the blaze broke out for unknown reasons around 1 p.m. local time (4 p.m. EDT) alongside the eastbound Riverside Freeway, just west of Green River Road in West Corona.
The fire swiftly grew to more than 3 square miles after starting just after midday Monday in canyons about 50 miles southeast of Los Angeles. We still have fire on the ridge.
An estimated 300 homes in west Corona were under a mandatory evacuation, with between 1,000 and 1,200 residents affected, Anaheim Fire & Rescue officials said.
It is burning in the foothills of the Santa Ana Mountains. There were no reports of injuries in the fire, which damaged one home and destroyed the trailer of a semi-truck, according to the Orange County Fire Authority.More news: Star Trek: Discovery is out and it looks glorious
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Five helicopters with night-vision capabilities and three planes, including a DC-10, were involved in the firefight, Concialdi said, although the big air tanker and some helicopters were grounded as night fell Monday, with shifting Santa Ana winds a cause for concern.
Crews were setting backfires, in order to keep the wildfire from crossing the freeway. Dominguez Ranch Road in Corona was closed to incoming traffic at Green River Road.
Two lanes of the eastbound 91 freeway near Coal Canyon Road remained closed Tuesday, according to the California Highway Patrol.
Temperatures near the Canyon fire in the Santa Ana Mountains will hover around 90 degrees with winds moving at about 5 miles per hour over the ridge tops with the occasional 15-mph gust, said Miguel Miller, a forecaster with the National Weather Service in San Diego.
As a result of the wildfire, numerous schools announced closures for Tuesday.