Firefighters note favorable weather conditions to contain the corral fire

The fire was 15% contained as of this morning, Cal Fire Santa Clara said in a Facebook post, with strong winds and dry grass “making it difficult for firefighters to contain it.”

Chief Baraka Carter said two firefighters were injured, the San Francisco Chronicle reported.

Interstate 580, which connects the San Francisco Bay Area to San Joaquin County in central California, was closed from the Alameda County line to the Stanislaus County line. SR 132 was also closed from I-580 to SR 33 due to the wildfire, the California Department of Transportation said in a statement.

The San Joaquin County Office of Emergency Services has issued an evacuation order for areas west of the California Aqueduct, south of Corral Hollow Creek, west of Alameda County and south of Stanislaus County. A temporary evacuation point has been established at the Larch Clover Community Center in Tracy.

Today's high temperature in Tracy is expected to reach 85 degrees Fahrenheit (29 degrees Celsius), with no rain expected, but warmer conditions are ahead.

The National Weather Service said “dangerously hot conditions” with highs of 103 F to 108 F (39.4 C to 42.2 C) were expected later in the week for the San Joaquin Valley, an area which includes the town of Tracy. Wind gusts of up to 45 mph hit the area Saturday evening, according to meteorologist Idamis Shoemaker of NWS Sacramento.

The wildfire occurred near Lawrence Livermore Laboratory Site 300, southwest of Tracy, Cal Fire said in a social media post Saturday evening.

Lawrence Livermore is a research and development institution that focuses primarily on the U.S. nuclear weapons stockpile. Site 300, 15 miles east of the lab's main facility, supports “explosive materials development and hydrodynamic testing and diagnostics,” according to the Lawrence Livermore National Laboratory website.

“Here, our researchers can safely formulate, manufacture and test high-explosive assemblies to evaluate the performance of non-nuclear weapon prototypes and components,” the Site 300 website states.

The wildfire posed no threat to laboratory facilities or operations and the fire had moved away from the site, Lawrence Livermore spokesman Paul Rhien said in a statement to The Associated Press early Sunday.

“We worked closely with Cal Fire, the Alameda County Fire Department and other emergency service partners throughout the evening,” Rhien said. “As a precautionary measure, we have activated our emergency operations center to monitor the situation throughout the weekend.”

The Associated Press and KQED's Katherine Monahan contributed reporting to this story.