Rare Temperature Inversion Fills Grand Canyon with Fog

For more photos from Friday’s fog, explore the #grandcanyon hashtag.

On Friday, 29 November, visitors to the Grand Canyon in Arizona, USA, were greeted with an unlikely surprise as dense, low-hanging fog filled the canyon’s gorges in a rare atmospheric event.

The phenomenon is known as a temperature inversion, where a layer of hot air at higher altitude prevents colder air and fog underneath from rising. Inversions of this magnitude are thought to occur only about once per decade at the Grand Canyon, and visiting Instagrammers documented the event in force.