Yosemite Valley will close to the public Friday ahead of a powerful storm that could bring flooding to the area, officials said.

Visitors were asked to leave by 5 p.m. and all overnight reservations were canceled through Saturday night, according to Yosemite National Park officials who say the storm may cause “significant impacts.”

After the storm passes, authorities will assess road and facility conditions to determine when Yosemite Valley, home to many of the park’s picturesque waterfalls and cliffs, can reopen.