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the falling to earth of any form of water (rain or snow or hail or sleet or mist)

Dew point

the temperature at which the water vapor in the air becomes saturated and condensation begins


(meteorology) the atmospheric phenomenon created at the boundary between two different air masses

Latent Heat

heat absorbed or radiated during a change of phase at a constant temperature and pressure


a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer


column of air rising in lower altitudes of Earth's atmosphere


the process of extracting moisture

Dry adiabatic rate

the rate of adiabatic cooling or warming in unsaturated air; the rate of temperature change is 1°C per 100 meters

Stable air

air that resists vertical displacement; if it is lifted, adiabatic cooling will cause its temperature to be lower than the surrounding environment; if it is allowed, it will sink to its original position


the act of increasing the density of something

Wet adiabatic rate

the rate of adiabatic temperature change in saturated air; the rate of temperature change is variable, but it is always less than the dry adiabatic rate

Unstable air

air that does not resist verticle displacement; if it is lifted, its temperature will not cool as rapidly as the surrounding environment, and so it will continue to rise on its own


the act of putting something somewhere

Orographic lifting

cloud formation that occurs when warm moist air is forced to rise up the side of a mountain

Temperature inversion

atmospheric condition in which warm air traps cooler air near the earth's surface


wetness in the atmosphere

Frontal wedging

lifting of air resulting when cool air acts as a barrier over which warmer, lighter air will rise

Condensation nuclei

Microscopic particles on which water vapor condenses to form cloud droplets.


being the most concentrated solution possible at a given temperature


the occurrence of two or more things coming together

Relative humidity

the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature

Convective lifting

weather process where the sun heats the land surface, which heats the adjacent air, and then the heated air rises.

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