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9 scary images of shelf clouds

Oct. 5, 2011, 9:02 a.m.
Shelf cloud over Oland, Sweden

Photo: Arnold Paul/Wikimedia Commons

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Öland, Sweden

This thunderstorm may have spoiled a day at the beach, but it also provided an unforgettable sight for beach-goers as it drifted toward the island of Öland, Sweden, on July 18, 2005.

Heavy rainfall can be seen gushing into the Baltic Sea from the storm's underside, while cool air spills unevenly from the top, helping give this shelf cloud its bizarre swooping shape.