| 41. | Arctic air will slide south into the northern Plains.
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| 42. | An Arctic air mass resembles a wedge of cheese.
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| 43. | The arctic air in the Midwest and Northeast is responsible for some of the increases.
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| 44. | But the deep nocturnal chill was not the result of a frigid Arctic air mass.
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| 45. | Arctic air will continue its slow but inexorable progress toward the East Coast on Wednesday.
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| 46. | Near its leading edge, Arctic air is very shallow.
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| 47. | Scattered snow flurries will occur in the Arctic air over the eastern Dakotas and Minnesota.
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| 48. | A pool of Arctic air will ooze south into Montana and the Northern Plains on Wednesday.
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| 49. | This week, arctic air has retreated into Canada.
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| 50. | Arctic air will be driven south through the Gulf States on gusty winds from the northwest.
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