Wind is the
flow of
air. More generally, it is the flow of the
gases which compose an
atmosphere; since wind is not only an
Earth based
phenomenon.Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them, the geographic regions in which they occur, or their effect.There are global winds, such as the wind belts which exist between the atmospheric circulation cells. There are upper-level winds which typically include narrow belts of concentrated flow called
jet streams. There are synoptic-scale winds that result from pressure differences in surface air masses in the middle latitudes, and there are winds that come about as a consequence of
geographic features, such as the
sea breezes.
Mesoscale winds are those which act on a local scale, such as gust fronts. At the smallest scale are the microscale winds, which blow on a scale of only tens to hundreds of meters and are essentially unpredictable, such as
dust devils and
microbursts.
See more at Wikipedia.org...