http://www.youtube.com/watch?v=KfRN5dZq4ew
It's really strange to see the whole cloud cover in the sky move abruptly when a change in wind direction happens.
It can move from north to south instantly.
This only apply if you use 'wind: auto' setting in editor
Many mission creators use default wind setting so please remove this cloud behaviour.
If you set wind to manually and apply wind and wind gusts, it doesn't behave like this.
EDIT
'Wind direction' setting should slowly change the main direction of wind when set to auto.
'Wind gust' setting should make abrupt change in wind direction at ground level and affect particle effects like smoke etc.