On the above storm relative velocity image, the green/blue colors are motion toward the radar (which is located off the image on the upper-center portion of the screen), while the red/orange colors are motion away from the radar. Note the "couplet" (where wind movement toward and away from the radar meet in a small, compact geographic area) showing strong rotation just North of Herscher. This is the radar signature known as a "TVS" or Tornadic Vortex Signature. This is most likely where the tornado is taking place on the ground. This is a very dangerous situation taking place in a populated area.
Below is another view of the same rotation/TVS taken from the same radar, but on GRLevel2, which shows data in a higher resolution. This image was taken about 10 minutes after those above. The strong rotation is now just North/Northwest of Irwin:
As I was typing the above another updated GRLevel2 image came in; the rotation is now even better defined to the East/Northeast of Irwin:
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