It will be shown that the visual appearance (vertical extent and diameter) of the funnel does not correlate well with tornado strength inferred by examining time height diagrams of maximum vertical vorticity and circulation. Evolution of the swirl ratio and retrieved pressure field will be presented in an attempt to understand why the visual appearance of the funnel was nearly ten minutes after the time of tornado genesis as determined by Doppler radar. Analyses will also be shown illustrating the relationship between the radius of maximum wind with the funnel cloud width.
The low-level wind field in the tornado corner flow region will also be compared to the funnel appearance. It appears that the funnel diameter narrows substantially in the lowest levels where radial inflow is observed. The funnel widens abruptly above the inflow where weak radial outflow was observed.
Finally, a vortex-line analysis will be shown at a time just before tornado genesis when a well-defined cyclonic and anticyclonic cloud base lowering was observed. Vortex lines will be plotted through the visual vortex couplet in an attempt to confirm a recent hypothesis that the vortex pair is created by the upward tilting of baroclinic-generated vorticity.