Mammatus Clouds Swirl Over Colorado on Fourth of July

Impressive mammantus clouds formed over Berthoud, Colorado, on July 4 as the metro Denver area expected severe storms.

Meagan Schrecengost was enjoying Fourth of July celebrations with her children when she noticed the clouds and took out her phone to record them. The video shows the clouds, which appear to look like puffy cotton balls lining the Colorado sky. Credit: Meagan Schrecengost via Storyful