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Dew Point

The temperature that which the air has to be cooled to reach saturation

Reletive Humidity

The ration of the air's water-vapor content to its water-vapor capacity

Condesation Nuclei

Tiny bits of particulate matter that serve as surfaces on which water vapor condenses


One of three basic cloud forms; one of the three cloud types; thin delicate ice crystal clouds.


One of three basic could forms; billowy individual cloud masses that often have flat bases


One of three basic cloud forms; sheets or layers that couver much or all of the sky

Air Mass

A large body of air that is characterized by similar temperatures and amounts of moisture at any given altitude


The boundary between two adjoining air masses having constrasting characteristics

Warm Front

A front along which a warm air mass overrides a retreating mass of cooler air.

Cold Front

a front along a cold air mass thrusts beneath a warmer air mass

Stationary Front

a situation in which the surface posisiton of a front does not move

Occluded Front

a front formed when a cold front overtakes a warm fornt; it marks the beginning of the end of a middle-latitude cyclone


a strom produced by a cumulonimbus cloud and always accompanied by ligtining and thunder. Short but strong


Small, very intense cyclonic storm with exeedingly high winds, most ofter produced alond cold fronts and severe thunderstorms.


a dark cloud of great vertical extent charged with electricity

Supercell Thunderstorm

large, rotating single-cell thunderstorm, can cause tornadoes, large hail, frequent lightning, heavy rain, strong winds

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