Southern California remains under an extreme heat warning as residents brace for the hottest day of the week on Wednesday.

“It will be roasty toasty in the valleys, lower mountain elevations and far interior, with highs ranging from 100 to 110 degrees,” the National Weather Service said. The warmest conditions are expected in the western San Fernando Valley.

An extreme heat warning remains in effect for much of Southern California until 8 p.m. Thursday. Forecasters say there is a high risk of heat-related illness for anyone outdoors for extended periods. Heat advisories are also in place for areas along the coast.

“Highs for today: 98 in Ojai, 100 in Ontario. Temecula, good morning to you, 100 degrees expected there. 112 in Palm Springs. Unbelievably hot,” KTLA’s Kirk Hawkins said Wednesday morning.

Residents are urged to adjust their afternoon plans to limit strenuous outdoor activities during the heat of the day, stay hydrated and check in on elderly neighbors and loved ones.

The Weather Service said record highs are slightly warmer than those forecast for Wednesday. As a result, despite the extremely hot conditions, few, if any, temperature records are expected to be broken.

A few degrees of cooling are expected Thursday, but a more significant cooldown will arrive Friday as onshore winds increase.

Afternoon highs are expected to cool even more over the weekend, with below-average temperatures possible in some areas.

A Chino Hills man was arrested on suspicion of attempted murder following a violent incident at a local liquor store, authorities announced Tuesday.

The July 13 incident occurred around 5 p.m. in the 4000 block of Descanso Avenue, according to the San Bernardino Sheriff’s Department, which responded to reports of a stabbing at the location.

Arriving deputies found a stabbing victim inside the store and rendered medical aid until personnel with the Chino Valley Fire District arrived. The victim was transported to Pomona Valley Hospital Medical Center, where he remains in stable condition.

While being treated at the scene, investigators said the victim repeatedly stated that someone named Alex was responsible for the attack.

The suspect, now identified as Hayden Alexander Marquez, 30, was located not far from the liquor store and taken into custody, sheriff’s officials said.

Investigators did not provide a motive for the stabbing or detail the relationship between the two men.

Marquez was booked into the West Valley Detention Center on suspicion of attempted murder.

Anyone with information about the investigation is urged to contact the Chino Hills Police Station at 909-364-2000. Those wishing to remain anonymous can call the We-Tip hotline at 800-78-CRIME or submit tips online at www.wetip.com.