<P> In situations where modern instruments are not available, an index finger can be used to test the direction of wind . This is accomplished by wetting the finger and pointing it upwards . The side of the finger that feels "cool" is (approximately) the direction from which the wind is blowing . The "cool" sensation is caused by an increased rate of evaporation of the moisture on the finger due to the air flow across the finger, and consequently the "finger technique" of measuring wind direction does not work well in either very humid or very hot conditions . The same principle is used to measure the dew point using a sling psychrometer (a more accurate instrument than the human finger). </P> <P> Another primitive technique for measuring wind direction is to take a pinch of grass and drop it; the direction that the grass falls is the direction the wind is blowing . This last technique is often used by golfers because it allows them to gauge the strength of the wind . </P>

What direction is the wind out of today