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| The boundary between two adjoining air masses having contrasting characteristics. |
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| A large body of air that is characterized by similar temperatures and amounts of moisture at any given altitude. |
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| changes in physical, chemical, and structural characteristics that matter undergoes when subjected to high pressure |
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| Upward flowing air lowers the air pressure of the area. |
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| A low-pressure center characterized by a counterclockwise flow of air in the northern hemisphere. |
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| A high-pressure centered characterized by a cloclwise nflowe of air in the northern hemisphere. |
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is the flow of gases on a large scale. On the surface of the Earth, wind
consists of the bulk movement of air. |
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| A measure of the average kinetic energy of individual atoms or molecules in a substance. |
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A process that takes place without a transfer of heat between
the system (such as an air parcel) and its surroundings. |
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A device that measures temperature or a temperature gradient
using a variety of different principles. |
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A device used for measuring wind speed, and is
a common weather station instrument. |
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A visible collection of particles of water or ice suspended in the
air, usually at an elevation above the earth's surface. |
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The height of anything above a given planetary reference plane
, especially above sea level on earth. |
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| Any form of water, such as rain, snow, sleet, or hail, that falls to the earth's surface. |
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| Pressure caused by the weight of the atmosphere. At sea level it has a mean value of one atmosphere but reduces with increasing altitude. |
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| Is defined as the amount of wetness or water vapor in the air. |
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| The leading portion of a cold atmospheric air mass moving against and eventually replacing a warm air mass. |
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| A front along which an advancing mass of warm air rises over a mass of cold air. |
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| A type of cold, dry air mass originating at high latitudes over land areas |
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| Is known for its very frigid and dry air. The most common place in the United States to find this air mass is in Alaska. |
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| May be considered the cool, moist air mass which affects the United States. The source region for these air masses are the northern Pacific and the north-western Atlantic. Because they carry an abundance of moisture, they usually produce clouds and precipitation as they move inland and are forced upward by the rising land. |
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| Is formed during the process of cyclogenesis when a cold front overtakes a warm front. |
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| Is a boundary between two different air masses, neither of which is strong enough to replace the other. |
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| Is most often felt in the Southeast U.S. with respect to the United States. In the winter this air mass is shoved toward the equator but in summer it can cover much of the U.S. east of the Rockies. |
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| Is found over the UnitedStates only in the summer. Its source region is therelatively small area over the northern portion of Mexico, western Texas, New Mexico,and easternArizona. High surface temperatures and very lowhumidities are the main air mass characteristics. |
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