Southern California is bracing for an intense heat wave as a dangerous heat dome builds over the region, bringing double-peaked triple-digit temperatures and elevated humidity through the weekend. With the heat advisory in effect for various areas, forecasters warn that the conditions could make summer heat even more unbearable. Lifeguards are seeing increased activity due to high surf, and public health officials are urging employers to protect outdoor workers amid the extreme temperatures. Despite a brief midweek cooldown, residents can expect no relief throughout the week as humidity persists and heat warnings remain in place for multiple counties, including San Bernardino and Riverside. Experts suggest residents stay cool and safe during this challenging weather situation.