Dramatic images are emerging on social media -- some taken by local residents -- showing the size and destructive power of a forest fire that has been burning for days n and around Yosemite National Park.
The fire has burned more than 125,000 acres, destroyed nine structures and is threatening the power supply of San Francisco. Officials say 4,500 additional structures remain in its path. Residents say they were stunned by the fire's power.
The photo above shows the towering smoke near the town of Groveland, which is in the fire's path.