An unusual October heat wave has put more than 35 million Californians under heat alerts, with temperatures up to 20 degrees above normal from the Bay Area to the Mexico border. Extreme heat warnings in Southern California run through 8 p.m. Thursday, October 8, after a string of daily temperature records fell over the weekend. Key Takeaways Extreme heat warnings cover the coasts and valleys of Los Angeles, Ventura, Orange, Riverside, San Bernardino and San