| 31. | A gelid air mass over southern Canada will push south into the Plains.
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| 32. | The cold air mass will extend east to the Appalachian mountains.
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| 33. | Scattered thunder will develop in the unstable air mass in the Deep South.
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| 34. | Isolated afternoon thunder is possible where the two starkly contrasting air masses intersect.
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| 35. | High pressure near Chicago represents the center of a pleasant midsummer air mass.
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| 36. | This could be partly due to two air masses coming together.
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| 37. | Clouds and spotty showers will accompany a cool air mass across the Northwest.
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| 38. | Scenes at his open-air Mass suggested that was a tall order.
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| 39. | That collision of conflicting air masses usually causes particularly rambunctious storms in California.
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| 40. | In between lay the boundary between to starkly different air masses.
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