According to the latest IPCC report, «tropical cyclone frequency is likely to decrease or remain unchanged over the 21st century, while
intensity (i.e.
maximum wind speed and
rainfall rates) is likely to increase.»
Knutson and Tuleya (2004) estimated the rough order of magnitude of the sensitivity of hurricanes to climate warming to be about 4 % per deg C SST warming for
maximum intensities and about 12 % per deg C for near - storm (100 km radius)
rainfall rates (see also Knutson and Tuleya (2008) abstract here).