If you in-focus (or out focus, can't remember) a bit, you can actually observe and focus the atmospheric turbulence on the de-focused star or planetary image. I've done it with Jupiter, de-focused until I could see the atmosphere blowing over the de-focused image fairly clearly...and rapidly as you say. You can even tell the direction it is moving, or appears to move, anyway.
By moving the eyepiece outwards you are focusing closer and hence on upper air turbulence. Sometimes you can even focus on distinct layers. Way out of focus may help seeing thermal currents which are finger and worm like features which move much more slowly. See Texereau's "How to Make a Telescope" for details. You can also focus on a bright star and remove the eyepiece for a look.
Jupiter is too big to resolve well these wind driven features.
Nearby trees are troublesome. They hold heat pretty well and any local air movement will drive the local seeing bonkers. Nearby concrete, pavement and stone walls are problems as well. Local seeing is from the scope out and around 100 meters or so.
Glenn, yes, outside focus. Thanks, that makes sense. Ah, yea, forgot about removing the eyepiece.
Yea, Jupiter might be too large, but you can still see the turbulence. And unless some illusion is at work, maybe even infer the wind direction. A star may be better, as you say, but I observe Jupiter mostly and noticed it when coming to focus.