Honestly no, not with the winds in X-Plane anyway. Wind is simulated in only one direction per layer, and turbulence is a random algorithm. To make tornados happen you would need to program a custom solution. One approach would be to have a custom "tornado" object which appears under certain weather conditions in random.... In order to simulate them realistically you will need a super computer with the latest weather simulation, even then it still might be difficult..... The first approach ,with the right programming, could look very convincing.......