[nwctwx]

I'm not sure if there is a good way to tell if there is a stadium effect on IR.. But, the 4:31 image shows an even more well defined (warmer) eye... the way this storm looked earlier, we would probably see the effect on vis (too bad we can't turn on the lights!).

[NautiNurse]

I don't doubt you are correct about the concentric eyewalls. I compare reading the sats to learning to read x-rays.

The water vapor loop shows some very interesting changes. Initial frames show the clear eye, leading to the ERC in the latter frames. I just don't know exactly how to identify the structures.