To move a tile into the empty space, click on the tile to be moved. If you think you need a hint to see how the map should look, click here.
After the funnel touches the ground and becomes a tornado, the color of the funnel will change. The color often depends upon the type of dirt and debris is moves over (red dirt produces a red tornado, black dirt a black tornado, etc.).
Discover more about tornadoes at JetStream - an Online School for Weather.