| 41. | A sprawling Arctic air mass will seep into the Northeast while it surges southward into the Plains and upper Mississippi Valley.
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| 42. | Moist Pacific air loses its precipitation over several mountain ranges before moving over the region, while Arctic air masses are uninterrupted.
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| 43. | As the arctic air masses move south, they are modified, taking on some of the characteristics of the territory they traverse.
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| 44. | A notable exception is near the Great Lakes, where arctic air masses are warmed and moistened as they travel across the water.
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| 45. | February is typically the driest month of the year in Marquette as arctic air masses deflect moisture-laden storms far to the south.
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| 46. | The Arctic air mass started moving into the United States on the evening of January 19 and the morning of January 20.
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| 47. | The boundary between warm air and an advancing Arctic air mass will be active from the central Mississippi Valley to the eastern Rockies.
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| 48. | The record-breaking arctic air mass that chilled the eastern United States the past few days, has done its number on South Florida, too.
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| 49. | The Arctic air mass that gripped the northern Rockies and northern Plains on Thursday will push into the western Great Lakes region Friday.
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| 50. | The latest blow is the arctic air mass that is expected to give the region a wintry feel overnight, further stalling an already-delayed crop.
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