Yosemite Conservancy

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These Tuesday, July 18, 2017, webcam photos provided by the Yosemite Conservancy show the monolith known as Half Dome as smoke from the Ditwiler fire swirls into Yosemite Valley, from late morning to early afternoon, in Yosemite National Park, Calif. The Northern California blaze is also threatening powerlines that provide electricity to the park, officials said. The park remained open Wednesday but several roads frequented by tourists were closed. (Webcam by Yosemite Conservancy at yosemiteconservancy.org via AP)