Hi Chris. Your quote is fine until the end. The last sentence uses the word may without qualifying it with a probability. It also does not mention that the number of cyclones has decreased. The past decade has had fewer strong storms than the early part of the 1900s.
Climate is simply weather averaged over many years. The diurnal variation will not change. Your quote says that relative humidity is expected to remain constant. Since global warming therory suggests that the poles will warm more than the tropics, the earth's temperature would become more homogeneous. That would reduce surface temperature differences thus leading to fewer storms and weaker cold fronts.
As for the common situation of pressure preventing or allowing surface air to rise like I discussed, the temperature differential with respect to altitude is important. For coulds to get thinner as the earth warms, then the temperature difference between the surface and the upper atmosphere would have to decrease. How much thinner will they get? 10 percent? 20 percent? 80 percent? That will matter. Although since the upper atmosphere is cooling instead of warming contrary to global warming theory, the cloud thickness should actually increase.
Though people like Gore will disagree with you that there cannot be a runaway effect on earth, I was glad to read your last sentence.
