This is what the Grand Canyon looks like filled with clouds

(Image credit: AP/National Park Service)

The Grand Canyon fills up with rolling fog normally only once every few years. But on Wednesday, clouds filled the famous canyon for the second time in six weeks. The phenomenon is called a total cloud inversion, and it happens when cold, moist air gets trapped beneath a layer of warmer air. You can watch The Weather Channel explain cloud inversions here, or just enjoy nature's winter treat in this video from The Associated Press and National Park Service below. —Peter Weber

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Peter Weber, The Week US

Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.