Jeff Masters said it well:
"If it seems like getting two 1-in-100 to 1-in-500 year floods in eleven years is a bit suspicious--well, it is. Those recurrence intervals are based on weather statistics from Earth's former climate. We are now in a new climate regime with more heat and moisture in the atmosphere, combined with altered jet stream patterns, which makes major flooding disasters more likely"
Photos of flooding in Central Europe from the Atlantic.
If you flip a quarter 10 times and get all heads; what are the odds?
Odds are the quarter is no longer fair. What used to be 100 year floods are now 10 year floods.
We are in a new climate regime, the evidence is very strong now.