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'Polar Vortex' Dumps Arctic Air on 187 Million Americans


'Polar Vortex' Dumps Arctic Air on 187 Million Americans
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A powerful arctic blast of air has swept across much of the United States, causing temperatures to plummet so low that thousands of schools had to shut down and millions were forced to stay indoors. As VOA's Brian Allen explains, a weather pattern called "polar vortex" is causing the dramatic drop in temperatures.

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