[E. Pluribus Unum]

Hurricane strength is partially a function of the difference between air temperature and ocean temperature... the colder the ocean, the stronger the hurricane.

Global warming would make the oceans warmer, leading to weaker hurricanes.

[palmer]

the colder the ocean, the stronger the hurricane.

Not generally. There are cases where the dynamics of temperature contrasts can temporarily strengthen a hurricane. One example is the extratropical transition when the hurricane hits colder waters. Mostly in the tropics, the warmer the water, the stronger the hurricane.