The biggest heat wave of the year has arrived in Southern California and is expected to roast the region with triple-digit temperatures in some areas, prompting heat advisories and health concerns for vulnerable populations.

Red flag warnings issued Wednesday are in effect through the weekend for Los Angeles, Ventura, Santa Barbara and San Luis Obispo countys’ mountain and foothills, and much of the region is under an extreme heat warning starting Thursday into the weekend as forecasters project temperatures to steadily climb, possibly reaching up to 110 degrees far inland.

Extreme heat can result in heat-related illnesses and, if left untreated, can lead to death.

A 2021 investigation into heat-related deaths by The Times found that between 2010 and 2019 California’s official data

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