A large body of air throughout which temperature and moisture content are similar.

The front edge of a moving cold air that plunges beneath a warmer air mass like a wedge.

The front edge of advancing warm air mass that replaces colder air with warmer air.

A front of air masses that moves either very slowly or not at all.

A front that forms when a cold air mass overtakes a warm air mass and lifts the warm air mass off the ground and over another air mass.

An area of low pressure that is characterized by rotating wind that moves toward the rising air of the central low-pressure region.

A usually brief, heavy, storm that consists of rain, strong winds, lightning, and thunder.

A severe storm that develops over tropical oceans and whose strong winds of more then 120 km/h spiral in toward the intensely low-pressure storm center.

A destructive, rotating column of air that has very high wind speeds and that maybe visible as a funnel-shaped cloud.

An instrument that measure and indicates temperature.

An instrument that measures atmospheric pressure.

An instrument used to measure wind speed.

An instrument used to determine the direction of the wind.

A package of instruments that is carried aloft by balloons to measure upper atmospheric conditions, including temperature, dew point, and wind velocity.

Radio and detection and ranging, a system that uses reflected radio waves to determine the velocity and location of objects.

A pattern of meteorological symbols that represents the weather at a particular observing station and that is recorded on a weather map.