'Once in 300 years' rain hits Thai city as floods ravage South East Asia (bbc.com)

The entire thesis of once in 300 years or once in 1000 years or once in 100 years weather event really has to be let go by the media. The fact is these things are happening or more and more often and are a direct result of climate change and then not once in 300 years, they’re happening all the time

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'Once in 300 years'???

While the functional form of the statistical distributions themselves might still be valid, certainly the old parameters are no longer so.