large body of air with the same temperature and humidity
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front
where two different air masses meet normally causing precipitation
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humidity
amount of moisture in the air
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jet stream
fast moving stream of wind where cold, polar air meets warm air from the equator
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drought
a long period of unusually dry weather
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anemometer
tool that measures wind speed
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barometer
tool that measures air pressure
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wind vane
tool that measures wind direction
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air pressure
the pressure caused by the weight of a column of air pushing down on an area
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altitude
elevation above sea level
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atmosphere
the layer of gases that surrounds Earth
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condensation
the process by which molecules of water vapor in the air become liquid water
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Coriolis effect
the change that Earth's rotation causes in the motion of objects and that explains how winds curve
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evaporation
the process by which water molecules in liquid water escape into the air as water vapor
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precipitation
any form of water that falls from clouds and reaches Earth's surface
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Pressure
the amount of force pushing on an area
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water cycle
the continual movement of water among Earth's atmosphere, oceans, and land surface through evaporation, condensation, and precipitation
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dew point
the temperature at which the water vapor in the air becomes saturated and condensation begins
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cold front
A front where cold air moves in under a warm air mass.
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warm front
Forms when warm air slides up and over a cold air mass; it brings gentle rain or light snow followed by warmer weather.
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High pressure
A mass of sinking cool air that usually bring fair weather.
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Low pressure
A mass of rising warm air air that usually bring stormy weather.
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High to Low pressure
How winds move related to pressure
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Westerlies
The dominant winds that move across the USA
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Land breeze
Movement of air from land to sea at night, created when cooler, denser air from the land forces up warmer air over the sea
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Sea Breeze
movement of air from sea to land during the day when cooler air from above the water moves over the land, forcing the heated, less dense air above the land to rise
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