| 21. | Warm, maritime air can bring springlike conditions while strong Arctic air masses can push lows to between.
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| 22. | Usually, said Kousky, El Nino tends to generate strong west-to-east winds that break up large Arctic air masses.
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| 23. | Deeper in the Arctic air mass, the upper Middle West will be variably cloudy, breezy and very cold.
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| 24. | The Arctic air mass that gripped much of the contiguous states Sunday felled scores of records for chill.
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| 25. | Early on Friday, the mercury fell to one degree as the coldest part of the arctic air mass arrived.
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| 26. | Such a vertical variance indicates the shallowness of the Arctic air mass that invaded the Deep South this week.
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| 27. | A big snowstorm blanketed President Kennedy's inauguration in 1961, and an Arctic air mass forced Reagan's 1985 swearing-in inside.
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| 28. | An arctic air mass has been trapped across interior Alaska by a blocking high-pressure system over the Bering Sea.
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| 29. | And things promised to get worse, with an Arctic air mass squatting over the Northeast with no sign of moving.
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| 30. | A wavering front will separate an expanding arctic air mass over the Northeast from increasingly humid air over the Southeast.
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