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Anemometers is a meteorological instrument used to determine how fast the winds are in a rotating thunderstorm.
A tool used to gauge wind direction and speed is an anemometer. It is a typical piece of weather station equipment. Any instrument used to measure wind speed in meteorology is referred to by this term, which is derived from the Greek word anemos (wind). In 1845, Rev. Dr. John Thomas Romney Robinson of Armagh Observatory created a basic sort of anemometer. It had four hemispherical cups mounted on arms that were mounted horizontally on a vertical shaft. Any horizontal direction of air flow across the cups caused the shaft to rotate at a rate nearly inversely proportional to the wind's speed.
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