Edited to add that the NPS has extended the closure through at least Sunday, August 5, no time specified. In addition there are other closures. From the NPS website: "Mariposa Grove, and South Entrance are closed indefinitely. Tioga Road, Tuolumne Meadows, Big Oak Flat Entrance, and Tioga Pass Entrance are open. Hetch Hetchy is also closed."
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The LA Times is reporting that the Valley will be closed at least until 4pm on Friday, August 3.
Ferguson fire will keep popular parts of Yosemite closed through Aug. 3