Fog fills Grand Canyon

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ARIZONA - A rare spectacle has occurred in the skies over the Grand Canyon.

Visitors to the site were treated to a sea of thick clouds just below the canyon's rim. Fog pooled around the region, as a result of recent rains around northern Arizona.

The thick fog gathered around the canyons due to warm air being forced down by clouds and being unable to rise.

The National Weather Service says the event happens once every several years, although the latest occurrence was just a year ago.