 For CBS News, Austin. Meantime, millions of Americans are under health threats amid a record-breaking heat wave. Dangerously hot weather is prompting concerns across the country for the most vulnerable, and it's fueling wildfires out west. Our Elise Preston is in Los Angeles. Blistering temperatures, high winds, and dry brush are all fueling the lake fire near Santa Barbara. It's one of more than 100 wildfires that erupted in California. The fast-moving flames have already burned about 12,000 acres.