Weather flash cards

Term Definition
Weather The condition of Earth's atmosphere at a particular time and place.
Meteorologists Scientists who study the causes of weather and try to predict it.
Forecast A prediction of what the weather will be in the future.
Temperature The average amount of energy of motion in the molecules of a substance.
Convection The transfer of heat by movements of a fluid.
Humidity A measure of the amount of water vapor in the air.
Relative Humidity The percentage of water vapor in the air compared to the maximum amount of air can hold at that temperature.
Wind The horizontal movement of air from an area of high pressure to an area of lower pressure.
Cumulus Clouds that form less than 2 kilometers above the ground and look like fluffy,rounded piles of cotton.
Stratus Clouds that form in flat layers.
Cirrus Wispy,feathery clouds made mostly of ice crystals that form at high levels, above about 6 kilometers.
Thermometer An instrument used to measure temperature, consisting of a thin,glass tube with a bulb on one end that contains a liquid.
Anemometer An instrument used to measure wind speed.
Psychrometer An instrument used tomeasure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer.
Air mass A huge body of air that has similiar temperature,pressure, and humidity throughout.
Front The area where air masses meet and do not mix.
Cold front When a cold air mass pushes against a warm air mass.
Warm front When a warm air mass pushes against a cold air mass.
Tornado A rapidly whirling,funnel-shaped cloud that reaches down from a storm cloud to touch Earth's surface, usually leaving a destructive path.
Hurricane A tropical storm that has winds of 119km per hour or higher; typically about 600km across.

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