People watching the skies above Allegheny County and surrounding areas Thursday evening for signs of potential thunderstorms instead were treated to vistas of clouds resembling fluffy cotton balls.

It was not a bird, a plane, popcorn, cotton balls or giant cow udders in the skies above Bucks County on Sunday evening. So what was it? A unique weather phenomenon. Called mammatus clouds, these ...

Another round of storms battered some Ohio communities Wednesday evening with heavy but brief rainfalls, 60 mph gusts and a confirmed tornado while producing picturesque bubble-like clouds at sunset.

Strong to severe storms tracked through the Tennessee Valley Wednesday morning. These storms led to strong winds, heavy rain, and large hail but once the storms passed many quickly saw these storm ...

In the summer months, the skies can fill up with a variety of interesting and unusual cloud formations, especially during stormy weather. Clouds are more than just picturesque features of the sky; ...

The rounded, sack-like protrusions hanging from the underside of a cloud, usually a thunderstorm anvil, are scientifically known as mammatus clouds, according to the National Weather Service (NWS).

SPOKANE, Wash. — Fast-moving showers brought rain, graupel and small hail to the Inland Northwest on Tuesday. The storms that created them also provided some exciting sights. The pouch-like structures ...

Mammatus clouds are some of the most visually striking and unusual cloud formations in the sky. They appear as rounded, pouchlike lobes that hang down from the base of a cloud, usually under ...

If you looked up at the Wichita sky Tuesday night around sunset, dramatic cloud formations probably caught your eye. For those who missed the evening cloud cover, chances are good you can catch a ...

CEDAR RAPIDS, Iowa (KCRG) - As storms moved out of eastern Iowa on Sunday evening, some unusual cloud formations developed on the clouds that were left over. Mammatus clouds are the billowy clouds ...

A couple from Indiana were treated to a magical display of nature after a rare cloud formation filled the sky during a photo shoot for their 25th anniversary. Photographer Stephanie Pinkerton of ...