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Weather Glossary

Discover the definition of commonly used weather terms.

Terms A-C

Absolute humidity: The mass of water vapor in a given volume of air.
Advection: Horizontal movement of any meteorological property, such as warmth or humidity.
Advection fog: Fog formed by warm, humid air flowing over cool ground or water.
Air mass: A large body of air with uniform characteristics like temperature and humidity.
Apparent temperature: A measure of the danger to human health of various combinations of high temperature and high humidity.
Barometer: A device that measures air pressure.
Beaufort Wind Scale: Scale used to classify wind speed, devised in 1805 by British Admiral Francis Beaufort to classify winds at sea.
Blizzard: Snow falling with winds faster than 35 mph and visibility of 1/4 mile or less over an extended time period.
Climate: Average weather over a long time period, usually 30 years.
Cold front: A warm-cold air boundary with the cold air advancing.
Condensation: The change of a vapor to liquid.
Conduction: Transfer of heat within a substance or from one substance to another by molecular action.
Convection: Transfer of heat by the movement of the heated material. In meteorology, the up and down air motions caused by heat.
Cyclone: An area of low-atmospheric pressure with winds blowing around it, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere.

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