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63 Cards in this Set
- Front
- Back
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Air pressure |
The force, or weight, of the air pushing down on a area of surface |
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Air-Mass |
A large body of air in the troposhpere having similar pressure, moisture, wind, and temp characteristics throughout |
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Barometer |
A instrument used to measure air pressure |
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Calorie |
A unit of heat energy |
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Clouds |
Collection of tiny water droplets or ice crystals suspended in the atmosphere |
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Cold front |
Leading edge of a cold air mass |
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Condensation |
Change in phase from gas to liquid |
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Conduction |
The transfer of heat from molecule to molecule |
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Continental |
Air masses that develop over land |
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Convection |
The transfer of heat energy by currents |
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Currents |
Vertical movement of air or movements of the ocean due to differences in density |
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Cycles |
Wavelengths |
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Cyclone |
A low-pressure system in which the winds circle around the center in a counterclockwise direction in the northern hemisphere |
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Dew point |
The temp at which condensation occurs |
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Doppler effect |
The apart change in wave frequency as an energy source moves toward or away from the observer |
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Drizzle |
Fine drops of water which gently float to earths surface |
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Dynamic equilibrium |
A condition in which opposing processes are balanced |
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Electromagnetic spectrum |
The entire range of electromagnetic wavelengths |
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Energy source |
An object which gives off energy |
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Evaporation |
The process of changing from liquid to gas |
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Fog |
A cloud resting on the earths surface |
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Freezing |
Liquid to solid phase change requiring the removal of heat |
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Front |
The interface between two different air masses |
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Hail |
Ice pellets which may be repeatedly forced up into colder air and allowed to fall into warmer air having an onion like appearance of layers of ice |
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Heat energy |
Energy that is transferred from one body to another because of a difference in temp between the two bodies |
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Hurricanes |
A doughnut shaped ring of strong counterclockwise winds over 115 km per hour surrounding an extremely low pressure at the center |
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Isolation |
To be alone |
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Isobar |
An isoline that connects lines of equal atmospheric pressure on a weather map |
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Isobar |
An isoline that connects lines of equal atmospheric pressure on a weather map |
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Jetstream |
A narrow band of very fast moving westerly winds at high levels in the middle latitudes |
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Maritime air mass |
Air masses that develop over water |
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Melting |
Changing a solid to a liquid |
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Meteorology |
The study of weather |
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Occluded front |
A weather front that forms when a cold front moves into a warm front, forcing the warm air to rise |
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Planetary wind system |
The belts of prevailing winds found between earths pressure zones |
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Polar |
Air masses that develop over higher latitudes tend to be cool |
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Polar jet stream |
Mid latitude jet stream |
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Precipritation |
(1) the falling of liquids or solid water from clouds (2) the process by which dissolved substances come out of solution to form solids |
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Predict |
An inference based on based on observations that indicate what will happen in the future |
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Pressure gradient |
The rate of change in air pressure over a specific distance |
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Psychrometer |
An instrument used to measure the amount of moisture in the atmosphere |
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Radiation |
The emission of energy in the form of electromagnetic waves |
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Radioactive decay |
The breakdown of the nuclei of unstable atoms into more stable atoms of the same or other elements |
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Rain |
Large drops of water which fall to earths surface |
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Red shift |
As the source of visible light moves away from the observers, the wavelengths increase, creating a shift toward the red end of the visible spectrum |
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Relative humidity |
The ratio of the amount of water vapor in the air to the maximum amount of water vapor the air could hold at the given conditions of temp and pressure |
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Saturated |
The condition of being filled to capacity |
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Sleet |
Rain which freezes as it falls |
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Smog |
A combination of aerosols and water vapor in stagment air |
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Snow |
Ice crystals that form as a result of sublimation and grow large enough to fall to earths surface |
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Solar energy |
Energy from the sun |
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Specific heat |
The quantity of heat, the calories, needed to raise the temp of 1 gram of a 1° C |
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Station model |
Weather observation for a particular location are recorded |
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Stationary front |
A weather condition in which the boundary between two different air masses remains the same position |
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Temperature |
A measure of the average kinetic energy of the particles of a substance |
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Thermometer |
A instrument used to measure temp |
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Tornado |
Violent windstorms that take the form of rotating funnel of air that extends downward from a cumulonimbus cloud |
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Transpiration |
The process by which plants release water vapor into the atmosphere |
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Tropical |
Air masses that develop over lower altitudes, tend to be warm |
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Warm front |
When warm air mass overtakes a colder air mass |
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Wavelength |
The distance between two successive crests or troughs, or between corresponding points on successive cycles of a wave |
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Weather |
The condition of the atmosphere at a given time and place |
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Winds |
The horizontal movement of air |
