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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)

Cirrus

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)

Cumulus

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)

Stratus

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)

Front

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)

Thunderstorm

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)

Tornado

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

Cumulonimbus

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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