Yosemite officials say Chow, who was backpacking alone, was spotted from a helicopter above Wapama Fall in the Hetch Hetchy area on Friday. Chow was able to stay hydrated, had plenty of food, and had been staying in his tent.
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Officials said his preparedness and ability to make good decisions were key to his rescue and good health.
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A post on the Yosemite National Park Facebook page said Alan Chow had last been seen at the Hetch Hetchy entrance on February 17th.