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Weather Vocabulary Air pressure: Air pressure is the force exerted by the weight of a column of air above a particular location. Wind Vane: Also called a weather vane, is a tool for measuring wind direction. Cumulus Clouds: Means "heap" or "pile" in Latin. They are often described as "puffy" or "cotton-like" in appearance and related to severe weather arriving. Stratus Clouds: Flat, hazy, featureless clouds of low altitude varying in color from dark gray to nearly white. Stratus clouds may produce a light drizzle or snow. Cirrus Clouds: Thin, wispy clouds blown by high winds into long streamers. They are considered "high clouds" and they generally mean fair to pleasant weather. Humidity: Water vapor or dampness in the air. Absolute humidity is the quantity of water vapor in a given volume of air, expressed by mass. Weather Front: The boundary between two air masses of different temperatures and densities. Water Cycle: Also known as the hydrologic cycle or H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth. Anemometer: A device for measuring wind speed, and is a common weather station instrument. Thermometer: A device that measures temperature. Rain: Water falling in drops condensed from vapor in the atmosphere.