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| A large body of air in the troposphere with similar characteristics of pressure, moisture and temperature |
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| The rate of change from place to place within a field; also known as slope |
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| The temperature at which the air becomes saturated with water vapor and the relative humidity is 100%; at temperature below the dew point , condensation and sublimation occurs |
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| The greatest amount of water vapor the air can hold at the time |
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| An isoline used on weather and climate maps that connect points of equal air pressure |
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| a concentrated curving band of high speed, easterly moving winds usually at the top of the earth's troposphere |
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| An instrument that is used to indirectly measure the amount of water vapor in air, such as a sling psychrometer; with the use of data tables, temperature readings from a psychrometer can be used to determine relative humidity and dew point |
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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 from the Earth's surface, forming mid latitude cyclones (low) |
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| A weather instrument used to measure wind speed |
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| Atmospheric/Air/Barometric Pressure |
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| the weight of overlying atmosphere pushing down on a given mount of area; affected be changes in temperature, humidity and altitude |
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| An instrument used to measure air pressure |
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| The percent/fraction of the sky that that is covered by clouds |
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| The boundary of an advancing cold air mass and warmer air mass, where underlying cold air pushes forward like a wedge; characterized by a steep slope, rapid changes in weather, thunder storms and sometimes hail or tornadoes |
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| A low-pressure system that has air moving towards its center, rotates counterclockwise in the Northern Hemisphere, usually cause bad weather includes hurricanes and tornadoes |
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| an isoline used on weather and climatic maps to connect points of equal air temperature |
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| Falling liquid or solid water water falling from clouds toward Earth's surface |
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| The ratio of the amount of water vapor in the air to the maximum amount it can cold hold: often expressed as a percent |
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| A weather condition in which the boundary between two air masses remains the same |
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| Cities and other weather station sites on weather maps represented by circles, with symbols in and around each circle that indicate the many weather variables |
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| The farthest distance at which one can see a prominent object at Earth's Surface with the naked eye; decreased by by fog, air pollution, and precipitation |
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| Gaseous water in the atmosphere |
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