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2
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An ever-changing boundary in the middle latitudes between the colder air masses toward the poles and the warmer air masses toward the equator
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4
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Comes from the Latin word for “curl”. These clouds appear thin and wispy and are located at high altitudes
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5
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The ratio of the amount of water vapor in the air (absolute humidity) to the maximum amount it can hold (its moisture capacity)
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6
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Any form of moisture that falls from a cloud to the ground. For example, rain, snow, sleet or hail
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9
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The boundary between two nonmoving air masses
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10
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The boundary of opposing wedges of cold air masses formed when a cold front overtakes a warm front, lifting the warm air mass off the ground
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11
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Bands of easterly moving air at the top of the troposphere
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12
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A tropical storm with sustained winds of at least 120 km/h
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13
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The boundary of an advancing cold air mass and a warmer air mass, where the underlying cold air pushes forward like a wedge
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15
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When a warm, less dense air mass overtakes a cold, dense air mass
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