Tornados are formed when cool air overrides a layer of warm air, forcing the warm air to rise rapidly producing a twisting, funnel-shaped cloud that extends to the ground with whirling winds that can reach 300 mph.

Experiment: Try this out!
For this experiment you will need two 2 liter bottles. Put some water just under half of one bottle. Place the empty bottle on top of this one and use duct tape to seal the two together. (Optional bottle connectors can also be purchased from your local education supply store) Then turn the bottle upside down and shake it in a circular motion to make a virtual tornado. For added fun add 2-4 drops of food coloring, beads, glitter or small plastic animals to the water.