Condensational theory of stationary tornadoes
  Using the Bernoulli integral for air streamline with condensing water vapor a stationary axisymmetric tornado circulation is described. The obtained profiles of vertical, radial and tangential velocities are in agreement with observations for the Mulhall tornado, world's largest on record and longest-lived among the three tornadoes for which 3D velocity data are available. Maximum possible vortex velocities are estimated. 
Anastassia M. Makarieva, Victor G. Gorshkov, Andrei V. Nefiodov
physics.flu-dyn physics.ao-ph