Another grab from Mike Gibson (owner of the software) Here's a volume BR animation of the Greensburg tornado (looking down from above):
The isovalue was around 55dbz. Note the well-formed tube in the first half of the animation. On the third frame, you can see the "Greensb.." part of the name. After crossing Greensburg, the tube fills in somewhat due to debris and a change in the rotation strength. Amazingly, the tube became even more impressive in subsequent volumes. (paste from Mike)
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