"Epsilon formed and persisted in fairly cold waters (around 24C),
for a tropical cyclone.

It may well be that shear has been more significant than temperatures
in this extraordinary year." --- Paradigm

I have tried, with my 8-year old Power PC and a single column
atmosphere model, to explore just this relationship. (Great
minds seek parallel roads . . .) The model may indicate that
increased greenhouse forcing leads to increased vertical air
movement, which competes with the shear winds, and reduces
them. I wish I had more floating-point and graphics display
'horsepower.' Anyone got a spare NEC World Simulator?