 The extreme heat in the west, a big problem for crews battling numerous wildfires. Again today, new wildfires here are causing firefighters to scramble. On the 4th of July, the firefight calmed down thanks to lighter wind. And then on Thursday night, new fires blew up, including one in Mariposa County near Yosemite. Flames moving quickly, evacuation warnings posted. Firefighters say extremely hot weather is making fighting the flames even tougher. Cal Fire Captain...