What does a 'once-in-100-year' weather event actually mean?

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What does a 'once-in-100-year' weather event actually mean?
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After the recent floods in south-east Queensland were labelled a 'one-in-100-year' event, another such natural disaster shouldn't happen for another 99 years, right? Turns out, not so much.

After the recent floods in south-east Queensland were labelled a one-in-100 year event, another such natural disaster shouldn't happen for 99 years, right? Wrong.

So how did flooding occur in 2011 then again in 2022 and how much does it have to do with climate change? Over time, our exposure to natural disasters is increasing along with their impact due to population growth."In fact, doing the mathematics on it, if we assume that the process causing the extreme event is stationary with time , then we only have approximately 37 per cent chance that exactly one event will occur during a randomly chosen 100-year period.

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