Radar usually cannot sense whether a tornado is on the ground or not. So, we have to look for signatures of tornado development. Below is a very nice hook echo just to the west of the I-35 symbol.
The velocity data shows rotation as well. You can see the deep red color next to the green color
And, sure enough, storm chaser Steve Worthington captured a funnel in that location. It is between the wiper and the “S” in Severe.