The problem is that the Ross Gelbspan column in the link doesn't say what Reynolds implies.
As the atmosphere warms, it generates longer droughts, more-intense downpours, more-frequent heat waves, and more-severe storms.
Although Katrina began as a relatively small hurricane that glanced off south Florida, it was supercharged with extraordinary intensity by the relatively blistering sea surface temperatures in the Gulf of Mexico. (emphasis added)
Gelbspan is saying that warming will intensify storms, not make more of them. The irony is that most of the Southeast could use a hurricane. Whatever damage one might do on the coast, if a tropical depression were to dump heavy rains over Alabama, Georgia, Florida and Tennessee, it would be a blessing.