Wind speed
Rate at which air moves from high- to low-pressure areas / From Wikipedia, the free encyclopedia
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Not to be confused with Airspeed.
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Wind_wiki.png/640px-Wind_wiki.png)
Wind speed affects weather forecasting, aviation and maritime operations, construction projects, growth and metabolism rates of many plant species, and countless other implications.[2] Wind direction is usually almost parallel to isobars (and not perpendicular, as one might expect), due to Earth's rotation.