Los Angeles County firefighters responded to a brush fire in Valencia burning near Magic Mountain Tuesday.

A brush fire that began Tuesday near Magic Mountain spread to 25 acres in 40 minutes because of gusty winds, according to Los Angeles County firefighters.

The blaze began before 11:30 a.m. with gusts carrying embers away from the origin and igniting more fuel. Two Los Angeles County water-dropping helicopters were fighting the flames and a fixed-wing craft from the Los Angeles Fire Department was en route, officials said.

More than 190 firefighters were at the scene and no structures were threatened, officials said. Magic Mountain was open for park visitors, according to its website.

The National Weather Service issued a wind advisory for the area through Thursday, with gusts forecast up to 30 mph.

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Joseph.serna@latimes.com

@josephserna