polar vortex
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NASA Satellite Image Shows Polar Vortex Spreading Frigid Air Over United States
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Your Phone's Battery Might Not Survive Extreme Temperatures: How To Prevent It From Shutting Down
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Alaska readies for storm that will send cold blast to East Coast
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Polar vortex linked to global warming: Study
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Climate change means fewer extreme winters in the U.S. and Europe
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Warming Arctic spells less extreme cold for U.S., Europe
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Melting of the polar vortex could mean a vicious allergy season
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