Air Masses

Front

air mass Noun

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[air mas]

Back

air mass

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A huge body of air that has similar temperature, humidity, and air pressure at any given height.

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Example: The map shows different air masses over North America, each labeled with its temperature and humidity traits.

Front

jet stream Noun

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[jet streem]

Back

jet stream

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A band of high-speed winds high in the atmosphere that pushes large air masses from west to east.

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Example: The image shows jet streams as bands of fast winds circling the Earth, moving air masses from west to east.

Front

front Noun

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[frunt]

Back

front

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The boundary where two different air masses meet but do not easily mix, often resulting in changeable weather.

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Example: The image shows a cold front where two air masses meet, causing rain and thunderstorms.

Front

cyclone Noun

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[sy-klohn]

Back

cyclone

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A swirling center of low air pressure where winds spiral inward, often causing clouds, wind, and precipitation.

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Example: The image shows a cyclone's structure with labels for the eye, eyewall, and air movements, illustrating how winds spiral inward.

Front

anticyclone Noun

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[an-tee-sy-klohn]

Back

anticyclone

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A high-pressure center of dry air where winds spiral outward, often resulting in clear and dry weather conditions.

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Example: Arrows show air spiraling outward from a high-pressure center, illustrating an anticyclone.

Front

prevailing Adjective

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[pri-vey-ling]

Back

prevailing

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Describes something that is most common, frequent, or widespread in a particular area or at a particular time.

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Example: The image shows prevailing winds, which are the most common wind patterns in specific areas.

Front

stationary Adjective

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[stey-shuh-ner-ee]

Back

stationary

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Describes something that is not moving or is not intended to be moved from its fixed position.

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Example: Parked cars on a road demonstrate 'stationary' as they are not moving.

Front

cold front Noun

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[kohld frunt]

Back

cold front

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A front that forms when a dense, cold air mass runs into and slides under a less dense warm air mass.

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Example: A cold air mass moves under a warm air mass, causing clouds and rain.

Front

warm front Noun

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[wawrm frunt]

Back

warm front

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A front that forms when a warm air mass overtakes and rises over a slower-moving, denser cold air mass.

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Example: Warm air rises over cold air, forming clouds and precipitation.

Front

stationary front Noun

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[stey-shuh-ner-ee frunt]

Back

stationary front

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A boundary between two air masses where neither is strong enough to replace the other, causing it to remain still.

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Example: Warm and cold air masses meet but do not move, forming a stationary front.