The March Wind Doth Blow

“The stormy March is come at last, With wind, and cloud, and changing skies; I hear the rushing of the blast, That through the snowy valley flies.” WILLIAM CULLEN BRYANT. Swaying branches and swirling smoke betray the invisible force of March winds.  Not insignificant is the effect of winds on weather, but seldom do we pause to consider the cause of winds and the importance or value of them to mankind. Just what is wind? Briefly, it is air in motion.  And what is the cause of this...