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An anemometer is commonly used to measure wind speed. Global distribution of wind speed at 10m above ground averaged over the years 1981–2010 from the CHELSA-BIOCLIM+ data set [1] 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 ...
Wind speed on the Beaufort scale is based on the empirical relationship: [6] v = 0.836 B 3/2 m/s; v = 1.625 B 3/2 knots (=) where v is the equivalent wind speed at 10 metres above the sea surface and B is Beaufort scale number.
A plot of a typical log wind profile under statically neutral conditions. The roughness length plays a part in determining the slope of the line. Roughness length ( z 0 {\displaystyle z_{0}} ) is a parameter of some vertical wind profile equations that model the horizontal mean wind speed near the ground.
Estimates of wind power density are presented as wind class, ranging from 1 to 7. The speeds are average wind speeds over the course of a year, [8] although the frequency distribution of wind speed can provide different power densities for the same average wind speed. [9]
The wind speeds are greatest where temperature differences between air masses are greatest, and often exceed 92 km/h (50 kn; 57 mph). [24] Speeds of 400 km/h (220 kn; 250 mph) have been measured. [29] The jet stream moves from west to east bringing changes of weather. [30]
A wind speed gradient of 4 (m/s)/km can produce refraction equal to a typical temperature lapse rate of 7.5 °C/km. [51] Higher values of wind gradient will refract sound downward toward the surface in the downwind direction, [52] eliminating the acoustic shadow on the downwind side. This will increase the audibility of sounds downwind.
Commercial flights typically travel between 480 to 575 mph speeds, ... the second "strongest upper-level wind recorded in local history going back to the mid-20th century," the National Weather ...
Knowing the wind sampling average is important, as the value of a one-minute sustained wind is typically 14% greater than a ten-minute sustained wind. [16] A short burst of high speed wind is termed a wind gust ; one technical definition of a wind gust is: the maxima that exceed the lowest wind speed measured during a ten-minute time interval ...