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Wind direction is the direction from which the wind is blowing. It is usually reported in cardinal directions or in azimuth degrees. There are a variety of instruments used to measure wind direction, such as the windsock and wind vane. Both of these instruments work by moving to minimize air resistance. The way a weather vane is pointed by prevailing winds indicates the direction from which the wind is blowing. A windsock points in the direction opposite to the direction from which the wind is blowing. Modern instruments, called electronic anemometers measure wind speed and direction in a similar fashion but contain electronics to translate directional data from the vane into formats which computers can interpret. Many of these instruments measure wind speed as well. In primitive situations where these modern instruments are not available, a person can use their index finger to test the direction of wind. This would be done by wetting the finger and pointing it upwards. Thus, the side of the finger which feels cool is the direction from which wind is blowing. The coolness is caused by an increased rate of evaporation of the moisture on the finger due to the air flow across the finger. The same principle is used to measure the dew point (using a sling psychrometer, a more accurate instrument than the human finger), and thus the "finger technique" of measuring wind direction does not work well in either very humid or very hot conditions. [edit] See also
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