A dangerous heat wave is expected to grip California and parts of the southwest Friday and into the weekend, threatening millions of people and likely fueling existing wildfires. More than 25 million people are under excessive heat watches, warnings or advisories, including in Los Angeles, San Diego, Las Vegas, and Phoenix metro areas. The scorching heat will bring triple-digit temperatures to Los Angeles, where the mercury is forecast to reach 105 degrees on Friday and 100 on Saturday, CNN meteorologist Haley Brink said. Over a dozen record highs are forecast to be broken Friday afternoon across California.