| 11. | Without arctic air, Chicago clouds flourished within the moist confines of Pacific air.
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| 12. | Arctic air will surge into New England on brisk winds from the northwest.
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| 13. | Sunday, daytime readings will edge above zero degrees as Arctic air slowly erodes.
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| 14. | It also blocks frigid arctic air that otherwise would spill southward.
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| 15. | At Portland, Arctic air arrived after draining west through the Columbia River Valley.
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| 16. | The stronger jet stream is also shouldering frigid Arctic air to the north.
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| 17. | Meanwhile, Arctic air will slowly retreat from the upper Middle West.
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| 18. | The Arctic air has settled in a wide section of the nation's heartland.
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| 19. | That's when the idea of a dome of arctic air seems most useful.
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| 20. | The blast of arctic air responsible for the white-out conditions will continue Saturday.
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