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FCSDGeo-Weather
Weather Systems vocabulary (8)
| Term | Definition |
|---|---|
| air mass | large body of air that has relatively uniform conditions of temperature and pressure |
| anticyclone | high-pressure system that often brings cool, clear weather as its winds rotate clockwise and away from the center |
| artic air mass | extremely cold air mass that originated in the far north |
| calorie | a common measuring unit of heat energy |
| cold front | boundary between a mass of cold air and the warmer air it is replacing |
| continental air mass | body of dry air that is low in humidity because it formed over a land area |
| convergence | coming together of winds as they blow into a cyclone (low-pressure system) |
| cyclone | low-pressure system in which the winds rotate counterclockwise in the Northern Hemiphere and converge to the center |
| divergence | outward movement of winds from a high-pressure zone (anticyclone) |
| electromagnetic energy | energy, such as heat waves, visible light, and x-rays, that can radiate through empty space |
| electromagnetic spectrum | range of electromagnetic energy from long-wave radio waves to short-wave gamma rays |
| evaporation | change in phase from a liquid to a gas (vapor); AKA vaporization |
| front | boundary, or interface, between different air masses |
| heat energy | total potential and kinetic energy that an object can release as heat |
| high-pressure system | anticyclone; a dense mass of air in which the atmospheric pressure is the highest at the center |
| low-pressure system | cyclone; weather system in which the atmospheric pressure is lower than in surrounding areas |
| maritime air mass | body of air that is relatively moist because it formed over an ocean |
| occluded front | type of weather front produced when a cold air mass overtakes a warm air mass, isolating the warm air above the ground |
| phase | physical state of matter, solid, liquid, or gas |
| polar air mass | mass of cool air |
| stationary front | interface, or boundary, between two air masses that are not moving |
| station model | standardized form in which weather information in presented at a preset position next to the circle that indicates the geographic location of the reporting station |
| source region | place where an air mass originates |
| synoptic weather map | map showing a variety of field quantities, such as temperature, pressure, and sky conditions, at a particular time and over a large geographic area |
| tropical air mass | warm air mass |
| warm front | boundary between a mass of warm air and the colder air it is replacing |
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