The fire closed backcountry hiking in the park, but was not threatening the popular Yosemite Valley region.
The fire grew from 255 sq. Km to more than 430 sq. Km overnight yesterday and was only 2 per cent contained. Smoke blowing across the Sierra into Nevada forced officials in several counties to cancel outdoor school activities and issue health advisories, especially for people with respiratory problems.
The fire was threatening about 4,500 residences, according to the US Forest Service. Officials issued voluntary evacuation advisories for two new towns yesterday, spokesman Jerry Snyder said.
A mandatory evacuation order remained in effect for part of Pine Mountain Lake, a summer gated community that's a few miles from the fire line.
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Already, the blaze has destroyed four homes and 12 outbuildings in several different areas, Snyder said. One firefighter also sustained a heat-related injury.
Within the park, the blaze was burning on about 44 sq. Km in a remote area around Lake Eleanor, about 4 miles northwest of Hetch Hetchy reservoir, Yosemite spokeswoman Kari Cobb said.
The fire was more than 32 km from Yosemite Valley and skies there were "crystal clear," Cobb said.
The spectacular valley carved by glaciers offers visitors such iconic sights as the Half Dome and El Capitan rock formations and Bridalveil and Yosemite falls.