Some people will claim that the recent exceptional weather is due to climate change; indeed, I have read several articles that claim precisely that. But the weather isn't climate – except when the weather does things expected of it due to climate change (ie. when it matches the projections of computer models) – then the weather becomes climate. But when the weather does something not projected by computer models then the weather is just the weather and nothing to do with climate.
I believe that in the technical jargon of climatology, this is called, “Having your cake and eating it”.
What's actually happening is the effect of the El Nina and El Nino southern oscillation – two cyclical weather patterns that occur approximately every 5 years and have done so since time immemorial. It's also worth pointing out that global cyclone activity is at a 30 year low so it was inevitable that a big one was due sooner rather than later. Powerful cyclones are not a new phenomena in this region: Cyclone Mahina in 1899, killed over 400 people and was classed as a category 5 cyclone.
http://en.wikipedia.o...ahina_Cyclone_of_1899
Let us hope that Yasi rapidly loses its power once it landfalls.