Wind graphics - how to draw & animate in a game?

[mixedup]

I have a 2D game I'm working and want to be able to dynamic send out wind from a particular object at a particular location (e.g. fan). So I want to be able to visually show the wind leaving the fan and getting slight winder/less strong the further away from the fan.

Anyone have examples of graphics that could be used here to represent wind & how they should be animated to give the best effect?

It needs to be controlled programmatically as the direction and speed of the wind might change in the game, and the location it is coming from.