File - In this Jan. 3, 1997, file photo, the Merced River appears to form a lake in Yosemite Valley from heavy rains which melted the snow pack in Yosemite National Park, Calif. A massive storm approaching Central California could overflow rivers, trigger rockslides and send trees falling onto powerlines, putting visitors on alert in Yosemite National Park, which flooded from a 1997 storm that temporarily closed the park. (Mark Crosse/The Fresno Bee via AP, File)
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