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Weather and Climate

CMS 17-18

TermDefinition
Weather The short term state of the atmosphere, including, temperature, humidity, precipitation, wind, and visibility.
Relative Humidity The ratio of the amount of water vapor in the air to the amount of water vapor needed to reach saturation at a given temperature.
Precipitation Any form of water that falls to Earth's surface from the clouds, includes rain, snow, sleet, and hail.
Wind The movement of air caused by differences in air pressure.
Humidity The amount of water vapor in the air
Dew Point The temperature at which the rate of condensation equals the rate of evaporation. (at constant pressure and water vapor content)
Air Pressure The measure of force with which air molecules push on a surface.
Visibility The distance at which a given standard object can be seen and identified by the unaided eye.
Air Mass A large volume of air that has nearly the same temperature and humidity
Jet Stream A narrow band of strong winds that blow in the upper troposphere
Warm Front Transition zone where a warm air mass is replacing a cold air mass.
Cold Front Transition zone where a cold air mass is replacing a warmer air mass.
Front The boundary between air masses of different densities and usually different temperatures
Stationary Front A pair of air masses, neither of which is strong enough to replace the other.
Occluded Front When a warm air mass is caught between two cold air masses
Ocean Current A movement of ocean water that follows a regular pattern
Climate The weather conditions in an area over a long period of time
Latitude The angular distance north or south of the equator; expressed in degrees
Elevation The height of an object above sea level
Topography The size and shape of the land surface features of a region
Surface Current A horizontal movement of ocean water that is caused by wind that occurs at or near the ocean's surface
Created by: jdipofi
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