that's neat.
I always thought tornados were the most dangerous type of weather to have since you never know when one just shows up.
Well you can get programs that show areas of circulation called tvs or tornado vortex signatures.
These are not always tornadic but they indicate areas where the wind is quickly moving towards and away from the radar in close proximity.
These tvs indicators are used to issue a tornado warning.
In this case its a prediction based on the convective outlook which is saying that a deep upper level trough feature which is expected to develop into an upper level low (this is currently visible if you go to noaa and look at continental us water vapor loops) which will deepen and meet the warm layer coming up from the gulf.
Both of these will collide and along that boundary its going to get very ugly.
Its going to get interesting around here.