So where's all those hurricanes caused by global warming?

Global Tropical Cyclone Activity still at 30 year low

Since Hurricane Katrina (August 2005) and the publication of high-profile papers in Nature and Science, global tropical cyclone ACE has collapsed in half. This continues the now 4-consecutive years global crash in tropical cyclone activity. While the Atlantic on average makes up about 10% of the global, yearly hurricane activity, the other 90% deserves attention and has been significantly depressed since 2007. See Figure below.

Northern Hemisphere year-to-date ACE is nearing 50% below normal. The Western North Pacific is at 17% of normal (or the past 30-year average).

Link:
http://wattsupwiththat.com/2010/08/08/global-tropical-cyclone-activity-still-at-30-year-low/