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How to Change or Cancel Your Trip Due to Bad Weather

National Geographic Logo By Eric Rosen of National Geographic | Slide 1 of 13: A supercell thunderstorm strikes in South Dakota. Among the most severe storms, supercells can bring strong winds, hail, and even tornadoes. (See more extreme weather pictures.)

A supercell thunderstorm strikes in South Dakota. Among the most severe storms, supercells can bring strong winds, hail, and even tornadoes. (See more extreme weather pictures.)

© Photograph by Jim Reed, National Geographic

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