Prior to severe thunderstorms in Cumberland and Sampson counties Sunday evening, some of you saw a unique cloud formation.

Have you ever seen a ceiling of clouds with bumpy, pouch-like formations hanging down? Those are called "mammatus clouds." FOX Weather Meteorologist Ari Sarsalari explains how they form and whether ...

Mammatus clouds are associated with thunderstorm activity and are often found on the underside of cumulonimbus clouds Caitlin Kaiser graduated from the Georgia Institute of Technology with both an ...

Artist Statement: Mammatus clousds boil over the Oklahoma countryside as a spring thunderstorm rolls in. As the clouds flow like waves in the ocean, a bold of lightening illuminates the sky above the ...

Prior to severe thunderstorms in Cumberland and Sampson counties Sunday evening, some of you saw a unique cloud formation. Mammatus clouds will sometimes form within the anvil of a thunderstorm.