Such strong hurricanes have been rare in the past. Before the devastating 2005 hurricane season, only two years had seen more than one Category 5 hurricane. The 2005 season experienced four, including Katrina, Rita and Wilma.
Extreme conditions: What's happening to our weather?
Britain is just a few showers away from recording a record wet summer, at the climax of the most remarkable period of broken weather records in the country's history. All of the smashed records are to do with temperature and rainfall - the two aspects of the climate most likely to be intensified by the advent of global warming.
While no specific event can be ascribed directly to climate change, the sequence of events is strongly suggestive of a climate that is now unmistakably altering before our eyes.
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