Reuters: Fires whipped up by hot, gusty and erratic winds darkened Los Angeles skies on Saturday, scorching thousands of acres and hundreds of homes in the second-largest U.S. city. More than 10,000 people were ordered to evacuate as a fire that exploded overnight on the edge of the Angeles National Forest, north of Los Angeles, barreled into the San Fernando Valley and burned more than 8,000 acres. Los Angeles County Fire Department officials said one-fifth of the fire had been …