Beaufort scale
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The Beaufort scale is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.
A ship in a force 12 ("hurricane-force") storm at sea, the highest rated on the Beaufort scale
Sir Francis Beaufort
Image: Beaufort scale 0
Image: Beaufort scale 1
Wind speed
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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. Wind speed is now commonly measured with an anemometer.
An anemometer is commonly used to measure wind speed.
The original anemometer that measured The Big Wind in 1934 at Mount Washington Observatory
FT742-DM acoustic resonance wind sensor, one of the instruments now used to measure wind speed at Mount Washington Observatory
Anemometer on an outdoor stage set, to measure wind speed