The ongoing heat wave is affecting millions of residents across Southern California, including those in typically cooler coastal areas. Prolonged exposure to high temperatures can lead to heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. The lack of cooling overnight exacerbates the risk, as it prevents the body from recovering from daytime heat. Additionally, the heat may strain energy resources as residents increase air conditioning use, potentially leading to power outages.