Barnabu blog discusses how to add a sky with clouds over any spot on earth using Google Earth and a network link he has provided. He has created a half dome in Google Sketchup with diameter of 50 miles and placed a cloud texture within the dome. He then made this object a network link which will grab your current view and place the skydome model around that location. I navigated to Atlanta in Google Earth, invoked the skydome link and then turned on 3d images to get this view of Atlanta complete with a cloudy background. Sketchup is an amazing piece of software that teachers and students can utilize in very creative ways.

By way of Google Earth Blog...