Normalized rotation trends for the Campbell tornado
Notes:
This time series of normalized rotation from the GR2 analyst shows that the rotation developed simultaneously at the lowest elevation angles (0.5, 0.9 and 1.4 degrees) between 2341 and 2350z. The rotation persisted for several volume scans. The tornado touched down as the 0.5 degree rotation was cycling up, while the 1.4 degree rotation was cycling down.
Slide 18