[[Wind]] that is drawn as visible streaks of color, usually white or grey. In real life, "this can happen":https://i.stack.imgur.com/Eo6iV.jpg when vapor or particulate matter makes it possible to see the otherwise-invisible motion of the air.

h4.See also
* [[contrail]]
* [[dust cloud]]
* [[motion lines]]
* [[shockwave]]
* [[smoke trail]]
* [[sound wave]]
* [[tornado]]
気流