Inland areas with big population booms will experience the most high heat days. The combination puts more people at risk — and cities are unprepared.

CalMatters identified the California communities most at risk — the top 1% of the state’s more than 8,000 census tracts that have grown by more than 500 people in recent years and are expected to experience the most intensifying heat under climate change projections.

The results: Lancaster and Palmdale in Los Angeles County; Apple Valley, Victorville and Hesperia in San Bernardino County; Lake Elsinore and Murrieta in Riverside County; and the Central Valley cities of Visalia, Fresno, Clovis and Tulare.