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15 Cards in this Set

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Cloud

a visible mass of condensed water vapor floating in the atmosphere, typically high above the ground.

dew point

the atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can form.

relative humidity

the amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature.

air mass

a body of air with horizontally uniform temperature, humidity, and pressure.

cold front

the boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system.

front

the side or part of an object that presents itself to view or that is normally seen or used first; the most forward part of something.

occluded front

a composite front produced by occlusion.

squall line

a narrow band of high winds and storms associated with a cold front.

stationary front

A stationary front is a pair of air masses, neither of which is strong enough to replace the other. On a weather map, this is shown by an inter-playing series of blue spikes pointing one direction and red domes pointing the other.

blizzard

a severe snowstorm with high winds and low visibility.

cyclone

a system of winds rotating inward to an area of low atmospheric pressure, with a counterclockwise (northern hemisphere) or clockwise (southern hemisphere) circulation; a depression.

heat wave

a prolonged period of abnormally hot weather.

hurricane

a storm with a violent wind, in particular a tropical cyclone in the Caribbean.a wind of force 12 on the Beaufort scale (equal to or exceeding 64 knots or 74 mph).

lake effect snow

snow falling on the lee side of a lake, generated by cold dry air passing over warmer water, especially in the Great Lakes region.

lightning

the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.