Southern California is bracing for an unprecedented heat wave, with record-breaking temperatures projected over the coming days. Weather officials warn that highs could reach near 100°F, impacting areas from Downtown Los Angeles to Pasadena and Orange County. Several heat advisories are in effect, particularly for Thursday and Friday, with warnings issued for the Santa Ynez Mountains and Central Coast. Despite a brief cooldown earlier in the week, temperatures are expected to surge again, with the Pasadena area potentially seeing highs in the upper 90s. Residents are advised to take precautions as the heat is anticipated to last for about a week.