Visitor Safety Visitor Experience Visitor Access Glacier National Park Death Valley National Park Safety Precautions Park Features Fees and Passes United States Adventure Tourism Recreational Water Use Visitor Incidents Visitor Information Glen Canyon National Recreation Area Hiking Trails Visitor Services Lake Powell Bryce Canyon National Park Zion National Park Safety Tips California National Parks Camping Arizona Canada Cape Point West MacDonnell National Park State Parks Cherokee National Forest Recreation Yosemite National Park Hiking Wildlife Viewing Joshua Tree National Park Popular Parks Grand Canyon
Park officials say hot, windless afternoons can make long, horizontal branches on older black oaks break without warning and urged visitors to steer clear of large limbs.