Mammatus clouds forming at sunset, as captured by photographer and storm chaser Jason Weingart. ​ "Mammatus" comes from the Latin "mamma" which translates to "udder" or "breast". They generally form in unstable cumulonimbus clouds, and are associated with a chance of hail. Their distinctive appearance is most noticeable at sunset, like here, when their pouches are framed by the sunlight. ​ ​Video credit: Jason Weingart. Check out his page for more awesome storm photos and video: https://www.face

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