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9 scary images of shelf clouds

By: Russell McLendon on Oct. 5, 2011, 9:02 a.m.
Shelf cloud over Saskatchewan, Canada

Photo: Jeff Kerr/NASA

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Saskatchewan, Canada

Shelf clouds don't only glow blue, or from within. This one shone red, for example, as it was struck by the rising sun over the prairies of Saskatchewan, Canada, in August 2001.

This photo shows a similar effect on a roll cloud.