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Wind speed
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== Units == The [[metre per second|meter per second]] (m/s) is the [[SI unit]] for velocity and the unit recommended by the [[World Meteorological Organization]] for reporting wind speeds, and used amongst others in weather forecasts in the [[Nordic countries]].<ref>[http://www.whiteweather.com/wd/vind/Windspeed.htm Windspeed | Icelandic Meteorological office] "The Icelandic Meteorological Office now uses the SI (Systeme Internationale d'Unites) measurement metres per second (m/s) [β¦] other Nordic meteorological institutes have used this system for years with satisfactory results"</ref> Since 2010 the [[International Civil Aviation Organization]] (ICAO) also recommends meters per second for reporting wind speed when approaching [[runway]]s, replacing their former recommendation of using [[kilometres per hour|kilometers per hour]] (km/h).<ref>[https://aerosavvy.com/wp-content/uploads/2014/08/an05_cons.pdf International Civil Aviation Organization β International Standards and Recommended Practices β Units of Measurement to be Used in Air and Ground Operations β Annex 5 to the Convention on International Civil Aviation]</ref> For historical reasons, other units such as [[miles per hour]] (mph), [[Knot (unit)|knots]] (kn),<ref>[https://www.thoughtco.com/measuring-wind-speed-in-knots-3444011 Measuring Wind Speed in Knots] "The reason why sea winds are measured in knots at all has to do with maritime tradition"</ref> and [[feet per second]] (ft/s) are also sometimes used to measure wind speeds. 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.
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