![]() ![]() Wind speed is affected by a number of factors and situations, operating on varying scales (from micro to macro scales). Historically, wind speeds have also been classified using the Beaufort scale, which is based on visual observations of specifically defined wind effects at sea or on land. įor historical reasons, other units such as miles per hour (mph), knots (kn) or feet per second (ft/s) are also sometimes used to measure wind speeds. Since 2010 the International Civil Aviation Organization (ICAO) also recommends meters per second for reporting wind speed when approaching runways, replacing their former recommendation of using kilometres per hour (km/h). The metre per second (m/s) is the SI unit for velocity and the unit recommended by the World Meteorological Organization for reporting wind speeds, and is amongst others used in weather forecasts in the Nordic countries. Wind direction is usually almost parallel to isobars (and not perpendicular, as one might expect), due to Earth's rotation. Wind speed affects weather forecasting, aviation and maritime operations, construction projects, growth and metabolism rate of many plant species, and has countless other implications. ![]() Wind speed is now commonly measured with an anemometer. In meteorology, wind speed, or wind flow speed, is a fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature. Global distribution of wind speed at 10m above ground averaged over the years 1981-2010 from the CHELSA-BIOCLIM+ data set An anemometer is commonly used to measure wind speed. ![]()
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