In California, a forest fire rages in Corral, hotter weather forecast

The National Weather Service warned that extreme heat is expected across much of California this week, including the San Joaquin Valley.


Hundreds of emergency workers continued to battle a 5,700-acre wildfire east of San Francisco on Monday, injuring two firefighters and prompting evacuations as high temperatures are forecast later this week.

The Corral Fire broke out Saturday afternoon near the city of Tracy in San Joaquin County, according to the California Department of Forestry and Fire Protection. Strong winds caused the fire to spread quickly across hundreds of acres of tall grass, prompting authorities to order evacuations and send hundreds of firefighters and other emergency personnel to the remote area.

As of Monday morning, the fire is 75% contained and has burned about 22 square miles, CalFire said. The cause of the fire is currently under investigation.

Officials said the fire broke out near the Lawrence Livermore National Laboratory, a government lab about 40 miles southeast of downtown Oakland that conducts experiments on nuclear reactions, lasers, atomic structure and molecular biology. The lab's proximity to the fire did not pose an immediate threat, authorities said.

On Sunday, authorities downgraded the evacuation orders to evacuation warnings and urged residents to “remain vigilant and prepared for possible changes.”

Fire affects water supply system, authorities issue warning

Meanwhile, some areas have closed roads to non-residents, while others have been asked to boil their tap water.

Citing a water outage, the State Water Resources Control Board, Division of Drinking Water and San Joaquin County Health Department on Sunday urged residents of the CSA 16 Par Country Estates Water System – which serves over 50 properties – to “use boiled tap water or bottled water for drinking and cooking as a safety precaution.”

“DO NOT DRINK THE WATER WITHOUT BOILING IT FIRST,” the warning said. “Failure to follow this recommendation may result in stomach or intestinal disorders.”

A heat warning is issued for the San Joaquin Valley

More than 475 emergency personnel are involved in the emergency response, which includes more than 40 fire trucks, 16 bulldozers and dozens of hand crews. Firefighting aircraft from across the country are flying firefighting missions as conditions permit, CalFire said.

On Sunday evening, authorities said that favorable weather conditions had allowed firefighters to make progress in constructing and maintaining control lines. However, the favorable weather may not last long.

The National Weather Service warned that extreme heat will affect much of Central California this week, including the San Joaquin Valley. The advisory, in effect from 11 a.m. Tuesday to 8 p.m. Thursday, warns of “dangerous heat conditions” with possible temperatures of 95 to 108 degrees Fahrenheit (35 to 42 degrees Celsius).

“This level of heat risk means there is likely to be little to no relief overnight for those who cannot be adequately cooled and/or hydrated,” the weather service said, adding: “Heat-related illnesses increase significantly during extreme heat, particularly among people who work or spend time outdoors.”

Contributors: Jorge L. Ortiz, Trevor Hughes