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Mammatus clouds after storm over North Sperrins in Londonderry, Ireland

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On September 10, 2025, in Londonderry, Ireland, @cassidy_rachel shared a video of dramatic cloud formation at North Sperrins. In the video, the sky is filled with thick, layered gray clouds as mammatus clouds briefly form after a storm cell passed, hanging above the mountain range and creating a striking atmospheric view.

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