 Again today, new wildfires here 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 Robert Foxworthy. These hot temperatures that we're experiencing obviously compound things. Alex Stone, ABC News, Los Angeles.