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chapter 21 vocab
Term | Definition |
---|---|
air mass | a large body of air throughout which temperature and moisture content are similar |
anemometer | an instrument used to measure wind speed |
barometer | an instrument that measures atmospheric pressure |
cold front | the front edge of a moving mass of a cold air that pushes beneath a warmer air mass like a wedge |
hurricane | a severe storm that develops over tropical oceans and whose strong winds of more than 120 km/h spiral in toward the intensely low-pressure storm center |
mid-latitude cyclone | an area of low pressure that is characterized by rotating wind that moves toward the rising air of the central low-pressure region |
occluded front | a front that forms when a cold air mass overtakes a warm air mass and lifts |
radiosonde | a package of instruments that is carried aloft by a balloon to measure upper atmospheric conditions, including temperature, dew point, and wind velocity |
radar | a system that uses reflected radio waves to determine the velocity and location of objects |
stationary front | a front of air masses that moves either very slow or not at all |
station model | a pattern of meteorological symbols that represents the weather at a particular observing station and that is recorded on a weather map |
thermometer | an instrument that measures and indicates temperature |
thunderstorm | a usually brief heavy storm that consists of rain strong winds lightning and thunder |
tornado | a destructive rotating column of air that has very high wind speeds and that may be visible as a funnel-shaped cloud |
warm front | the front edge of an advancing warm air mass that replaces colder air with warmer air |
wind vaned | an instrument used to determine the direction of the wind |