The so-called "Rim" fire near Yosemite National Park has grown to be the largest fire in California. It is well over 100,000 acres. While the exact cause is not known, it is believed to have been started by lightning strikes.
Containment figures are decreasing as the fire expands, standing at 1%. The general area of the fire is east of the town of Groveland, one of the major gateways to the park. Inciweb reports that the fire is moving both northwest and east. Inciweb is the inter-agency system that tracks fire-related incidents, specifically forest fires. They also report that it has crossed the western boundary of Yosemite.
Camp Mather is a recreational setting mostly for youth. It is in direct line of the fire path. Overall, about 4500 buildings could be affected in the region of the fire. It is entering steep mountain areas in the Tuolumne River Canyon and Hetch Hetchy. The Hetch Hetchy reservoir is maintained by the City of San Francisco. The dam there was built after the 1906 earthquake to provide the SF Bay area with water. It is fed by the Tuolumne which originates in Yosemite.
Highway 120 is the main western route into the park. It is closed four miles west of the Groveland Ranger Station and four miles east of Buck Meadows. Ferretti Road near the Pine Mountain gated home complex has been ordered evacuated. Fire teams there are focused on buildings. The small airport at Pine Mountain is also in jeopardy. C-130, helicopters and the monster DC-10 are dropping water and fire retardant non-stop. Cost for the fire suppression efforts are into the millions.
Evacuations are happening. Groveland businesses are open but seeing few customers. Local winds are blowing from the east which is helping to push the fire closer to Yosemite. The winds are varying up to 12 mph. The area remains dry with humidity in the 40% range. Trees are literally exploding from the heat.