A wildfire raging in the northwest part of Yosemite National Park is expected to advance farther into the park on Tuesday and continues to threaten a reservoir that supplies most of San Francisco's water.
The Rim Fire has burned more than 160,000 acres, most of that in the Stanislaus National Forest west of Yosemite. The fire is dangerously close to the Hetch Hetchy Reservoir that supplies water to San Francisco and its surrounding areas.
"In an effort to control the blaze, 12 helicopters and half-dozen fixed wing tankers are dropping water and retardant from the air," says Dr. Thomas Girnius, senior scientist at AIR Worldwide. "Additionally, 2,800 firefighters are fighting the blaze on the ground."
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