| 31. | Moisture levels in Arctic air are extremely low, given very low rates of evaporation.
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| 32. | When the current is strong, arctic air tends to remain bottled up far north.
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| 33. | The Northwest is normally protected from arctic air by the Rockies to the east.
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| 34. | It can also be defined as the southern boundary of the Arctic air mass.
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| 35. | Then Arctic air blasted New England, not one but two weekends in a row.
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| 36. | In the Northeast, another surge of arctic air will be accompanied by gusty winds.
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| 37. | Arctic air will surge mainly eastward from the upper Plains.
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| 38. | A new surge of arctic air will sweep into the Upper Midwest on Monday.
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| 39. | Frigid arctic air masses are shallow pools of dense air that have great weight.
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| 40. | The entire Northeast shivered as a mound of arctic air plunged directly south from Quebec.
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