Thanks for radar link...this is wicked!
Ripped from weatherunderground:
The tornado just moving off Lake Thunderbird is a rare situation... the circulation is close enough to the radar that radar is able to sample some of the sub-cloud parts of the storm, with the 0.5deg tilt beam centerline at ~250ft.
The tornado signature (TS, not TVS) is roughly 0.25-0.50mi peak-to-peak.