 Mandatory evacuation orders are already underway. Brutal extreme heat conditions for crews battling a California wildfire just southwest of Yosemite National Park. It's burned over 1,000 acres. The dangerous conditions from Mariposa County, California, Incident Commander Chief Justin Maycomb. It's well above 100 degrees. The RHs, the relative humidity is very low. They call it the French Fire. It broke out July 4th.