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Severe Tornado Outbreak in the Southern United States
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Published April 29, 2011
This animation shows powerful thunderstorms moving over the southern United States on April 27, 2011.
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Two Low Pressure Systems, Northeastern Pacific
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Published April 4, 2011
In these astronaut photographs from the ISS cupola, two distinct cyclonic vortices whirl within an area of low pressure that spanned the Pacific coast from southern California to Vancouver Island.
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