| 41. | Storms in the atmosphere mix air masses to eliminate temperature differences.
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| 42. | The juxtaposition of contrasting air masses provides the fuel for storms.
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| 43. | Thunderstorms with downpours will develop in the sultry air mass across the Southeast.
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| 44. | The leading edge of an Arctic air mass will seep into northern Montana.
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| 45. | They traced those air masses backwards to find the source of the pollution.
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| 46. | A dry air mass will soothe the northeast quadrant of the nation Saturday.
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| 47. | Several patches of thunderstorms will erupt in the steamy air mass.
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| 48. | Continental air masses bring significant amounts of snowfall during winter.
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| 49. | A warm, moist air mass covered most of the southeast.
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| 50. | Tornadoes form underneath severe thunderclouds in which warm and cold air masses are colliding.
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