Mammatus clouds. These clouds typically form in association with cumulonimbus clouds, which can bring thunderstorms, heavy rain and hail.

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Photo credit: © IAN GOWLAND/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, cloud, cloudlets, clouds, cloudy, evening, formation, gray, grey, mammatus, meteorological, meteorology, overcast, silhouette, sky, stormy, tree, weather