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Well, the evaporation process effectively becomes a storage for latent heat. The heat then moves to some other part of the earth. If more water is evaporated, the could coverage will be greater., depending on the altitude of these clouds depends on if the effect creates a mostly positive or mostly negative feedback, at least how the literature reads.You would think that warming of water in the tropics would increase evaporation, therefore humidity, therefore cloud formation, therefore reduced heating and increased cloud convection. So the cycle might be heating, cloud formation, cooling/precipitation, rinse and repeat. But in order to see this with satellite data then a time lag must be included. Roy Spencer did this and showed an overall negative feedback from the water cycle in the tropics, but it has not caught on with the warmists for some odd reason.
I will contend that any cloud coverage over the oceans has a net negative feedback, because of the way the ocean absorbs radiant heat vs. solid surface areas.