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A long duration ice storm is impacting the Southern Plains and mid-South

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Expected to last until Wednesday

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Tree damage, power outages, and hazardous road conditions are all possibilities

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As of Monday night, 3.3 million under ice storm warning, 14.5 million under winter storm warning

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Frigid air from Upper Midwest and Great Plains meets moisture, causing icy precipitation

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Several rounds of wintry precipitation forecasted, including light freezing rain and sleet

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Ice accumulations may be over a quarter of an inch

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In certain regions, travel may be almost impossible

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Over 5,100 flights delayed, 1,100 cancelled as of Monday night

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Southwest and American Airlines issued rebooking waivers