Yosemite Valley Campgrounds Closed as High Wind Warning for Friday, December 2, 2016 is Announced Details Last Updated: Friday, 02 December 2016 04:25 Published: Friday, 02 December 2016 04:24 View Comments December 2, 2016 - A High Wind Warning is in effect for the Yosemite area through Friday, December 2. Tree failures are possible and may affect roads, campgrounds, and other areas. Upper Pines and Camp 4 campgrounds are closed.Source: NPS View the discussion thread. back to top