| 11. | It's expected to be followed by a mass of polar air within four days.
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| 12. | GE is also a partner in Polar Air Cargo, which has 12 Boeing 747s.
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| 13. | Cold polar air from the south can bring cooler temperatures.
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| 14. | In the winter the arrival of polar air masses that drop and cause frost.
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| 15. | Another push of polar air will reach Texas on gusty winds from the north.
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| 16. | Advancing polar air will reach the Dakotas later Monday, preceded by clouds and flurries.
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| 17. | Two other American cargo carriers, Polar Air Cargo and UPS, would also gain such rights.
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| 18. | Polar air will be confined to the northern Plains on the final day of 2004.
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| 19. | A surge of polar air into the Plains will keep temperatures far below seasonal levels.
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| 20. | Polar air will surge southward into the Middle Atlantic region and through the Ohio Valley.
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