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Dew Point

The tempeture to which air has to be cooled in order to reach saturation(p.508)

Relative Humidity

The ratio of the air's water-vapor content to its water-vapor capacity(p.506)

Condensation Nuclei

Tiny bits of particulate matter that serve as surface on which water vapor condenses(p.516)


one of three basic cloud forms; also one of the three high cloud types; They are thin, delicate ice-crystal clouds often appearing as veillike patchers or thin, wispy fibers(p.517)


one of three basic cloud forms; also the name given to one of the clouds of vertical development; They are billowy individual cloud masses that often have flat bases.(p.517)


one of three basic cloud forms; They are sheets or layers that cover much or all of the sky(p.518)

Air Mass

a large body of air that is characterized by similar temperatures and amounts of moisture at any given altitude(p.559)


the boundary between two adjoining air masses having contrasting characteristics(p.512)

Warm Front

a front along which a warm air mass overrides a reteating mass of cooler air(p.565)

Cold Front

a front along which a cold air mass thrusts beneath a warmer air mass(p.565)

Stationary Front

a situation in which the surface position of a front does not move; The flow on either side of such a boundary is nearly parallel to the position of th efront.(p.565)

Occluded Front

a front formed when a cold front overtakes a warm front; it marks the beginning of the end of a middle-latitude cyclone(p.567)


a storm produced by a cumulonimbus cloud and always accompanied by lightning and thunder; it is of relativley short duration and usually accompanied by strong winds gusts, heavy rain, and sometimes hail(p.571)


a small, very intense cyclonic storm with exveedingly high winds, most offten produced along cold fronts in conjunction with severe thunderstorms(p.573)


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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