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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

Cirrus

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

Cumulus

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

Stratus

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

Front

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

Thunderstorm

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

Tornado

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

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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