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short term state of the atmosphere, incuding temperature, humidity, precipitation, wind and visibility


the amount of water vapor in the air

relative humidity

the ratio of the amount of water vapor in the air to the maximum amount of water vapor the air can hold at a set temperature


the change of state from a gas to a liquid


a collection of small water droplets or ice crystals suspended in the air, which forms when the air is cooled and condensation occurs


any form of water that falls to the Earth's surface from the clouds

aire mass

a large body of air where temperature and moisture content are constant throughout


the boundary between air masses of different densities and usually different temperatures


an area in the atmosphere that has lower pressure than the surrounding areas and has winds that spiral toward the center


the rotation of air around a high-pressure center in the direction opposite to Earth's rotation


an electric discharge that takes place between oppositely charged surfaces, such as between a cloud and the ground, between two clouds, or between two parts of the same cloud


the sound caused by the rapid expansion of air along an electrical strike


a destructive, rotating column of air that has very high wind speeds, is visible as a funnel-shaped cloud, and touches the ground


a severe storm that develops over tropical oceans and whose strong winds of more than 120 km/h spiral in toward the intensely low-pressure storm center


an instrument that measures and indicated temperature


an instrument tat measures atmospheric pressure


an instrument used to measure wind speed

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