How are winds measured? What are the proper units for both wind speed and wind direction?
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Wind speed is normally measured by a cup anemometer consisting of three or four cups, conical or hemispherical in shape, mounted symmetrically about a vertical spindle. The wind blowing into the cups causes the spindle to rotate. Calibration corrections are applied to the measured wind speed.Wind direction is usually reported in cardinal directions or in azimuth degrees. Wind direction is measured in degrees clockwise from due north and The normal unit of wind speed is the knot (nautical mile per hour = 0.51 m sec-1 = 1.15 mph).
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