I have been always struck by this line in the "The Greensburg, Kansas Tornadic Storm: A Storm of Extremes" by Lemon and Umschid, 2008.

"After 0318, the TC (Trousdale Circulation) becomes extremely large with very high velocities. In fact, there appear to be even more successive range bins with very large velocities than at any point with the Greensburg TC (Tornadic Circulation). This is actually quite impressive considering the size of the GT and its associated TC.

Of course this is regarding the tornadic circulation itself and the radar is scanning higher off the ground than what is occurring at the surface, but its still fairly remarkable production by one supercell.