| 31. | The result is the polar air forms a coherent rotating air mass : the polar vortex.
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| 32. | The leading edge of a new polar air mass will stretch from upper Michigan to Montana.
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| 33. | The strongest winds are in the mid-latitudes where cold polar air meets warm air from the tropics.
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| 34. | High pressure in the central Plains will be associated with a mixture of Pacific and polar air.
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| 35. | Polar air will flow back into the Northeast on Saturday as low pressure strengthens near Nova Scotia.
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| 36. | A push of polar air into the Plains will produce scattered snow showers in the Missouri Valley.
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| 37. | A fresh surge of polar air will sweep across the Northeast on brisk winds from the Northwest.
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| 38. | In winter, due to the action of masses of polar air the temperature can reach 6 �C.
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| 39. | Snow showers will dust the western Great Lakes as polar air returns to the region on gusty winds.
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| 40. | A : Conditions that spawn tropical storms and hurricanes involve sea and air temperatures and polar air flows.
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