In the first image below, there is clearly a strong supercell that undoubtedly warrants a severe thunderstorm warning. Without having a full picture of what the environment looks like, and without looking at additional radar products, I can’t say for certain whether or not it should have tornado warning, given the strong convergant but non-rotational signature.In this next image, a couple of AzShear features stand out to me. 1) Positive values of AzShear have begun spiking on the north side of the convergant zone. 2) I believe that you’ve seeing the RFD start to kick downstream. Shortly thereafter, the storm develops a very clear couplet and it is clear this storm deserves a tornado warning. The tornado survey revealed that the tornado began when the second image in this post was captured. AzShear did a nice job highlighting important features on this storm, and may have lead to additional lead time on a tornado warning.Sandor Clegane