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Chapter 21 Vocabulay

Lucas Vieira and Sean Howard
Across
An instrument used to determine the direction of the wind
An instrument used to measure wind speed.
An area of low pressure that is characterized by rotating wind that moves toward the rising air of the central low-pressure region
A destructive, rotating column of air that has very high wind speeds and that may be visible as a funnel-shaped cloud.
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.
A pattern of meteorological symbols that represents the weather at a particular observing station and that is recorded on a weather map.
The front edge of an advancing warm air mass that replaces colder air with warmer air.
Down
An instrument that measures atmospheric pressure.
A severe storm that develops over tropical oceans and whose strong winds of more than 120km/h spiral in toward the intensity low-pressure storm center.
A package of instruments that is carried aloft by a balloon to measure upper atmospheric conditions, including temperature, dew point, and wind velocity.
A usually brief, heavy storm that consists of rain, strong winds, lightnings, and thunder.
A front of air masses that moves either very slowly or not at all.
The front edge of a moving mass of cold air that pushes beneath a warmer air mass like a wedge.
A system that uses reflected radio waves to determine the velocity and location of objects.
An instrument that measures and indicates temperature.
A large body of air throughout which temperature and moisture content are similar.