Weather Dangers - Grand Canyon National Park (U.S. National Park Service) Information On This Page Navigation. Be especially careful hiking the Grand Canyon, Marble Canyon, and Glen Canyon regions. The slot canyons in these areas are beautiful, but can be extremely dangerous when it rains. Hikers have been killed in flash floods generated by thunderstorms as far as 25 miles away.
Weather Dangers Weather Dangers|flash floods|thunderstorms
Weather Dangers Weather Dangers|flash floods|thunderstorms