Definition: “A tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as twisters or cyclones”.
Image and definition Credits to Wikipedia page http://en.wikipedia.org/wiki/Tornado
I have tried for sometime to write a parametric equation for a shape that “looks like” a tornado. The preliminary designs were not so good looking. After some trial and error and adding more components to the existing function, the better looking ones were obtained.The figures below illustrate the developments.
As you see, among the initial versions, some were “very regular” some were not even looking like a twister.
I will update this post once I can build better ones (Perhaps by using actual Tornado Solutions 🙂 )