LOS ANGELES — A wildfire burning near the Los Angeles-San Bernardino county line grew to more than 2,600 acres Saturday, spurring evacuation orders in Llano amid searing heat and approaching monsoonal weather conditions across Southern California.

The Summit fire ignited shortly before 1 p.m. Friday afternoon in Llano near Jesus Canyon Road and East Avenue Z and quickly spread to more than 600 acres, L.A. County Fire Department spokesperson Kaitlyn Aldana told The Times.

By 8 a.m. on Saturday, the fire had grown to 2,679 acres and was 0% contained, according to the California Department of Forestry and Fire Protection.

Multiple structures are threatened by the fire, but there are protection measures in place. No injuries had been reported so far, Aldana said.

Evacuation orders have been issued for an area roughly bordered by Highway 138 on the north, 263rd Street on the east, Largo Vista Road on the west and Big Pine Highway on the southern end.

An evacuation shelter has been set up at the Antelope Valley Family YMCA, 43001 10th St. West in Lancaster. An evacuation center for animals and livestock is available at the L.A. County Animal Care Center at 38550 Sierra Highway in Palmdale.

A smoke advisory is in effect in northern portions of L.A. and Riverside counties until 5 p.m. Saturday, as smoke from the incident is being pushed south over portions of the San Gabriel Mountains, according to the South Coast Air Quality Management District. Residents are advised to monitor AQMD’s map for air quality conditions in their area and to remain indoors if they see or smell smoke.

The fire is burning as approaching monsoonal moisture will bring a 10% to 20% chance of lightning in Los Angeles, Ventura, Santa Barbara and San Luis Obispo counties, primarily in mountain areas, starting Sunday and lasting through Thursday, said Spencer Fielding, meteorologist with the National Weather Service in Oxnard. This could raise wildfire risk, as dry lightning and gusty outflow winds are typically associated with these storm systems.

In Lucerne Valley, multiple homes and outbuildings were ablaze after another brush fire quickly spread, fire officials said.

Firefighters with the San Bernardino County Fire Protection District were called about the Allen fire just before noon, said Capt. Eric Sherwin, but southern winds quickly moved the flames toward nearby homes.

“We do have structures that are involved,” Sherwin said.

The initial call described a one-quarter-acre fire near Sunset Road and Allen Way, Sherwin said.

Power lines came down in the area because of the flames, he said, and one of the homes that was burning appeared to have ammunition inside.

Sherwin said firefighters could hear ammunition discharging in the distance as they continued to fight the flames.

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(Times staff writers Alex Wigglesworth and Clara Harter contributed to this report.)

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