The worst natural disaster that occurred here, that I know of, is the North Sea flooding of 1953. This resulted in the Delta Works, which have prevented similar things from happening.
My mom, and her (grand) parents lived in Baarlo, which was hit by the river Meuse overflowing during the '90s. She told about that a few times.
The effects of the water levels that were reached then are still visible, and it's honestly quite amazing how much land was flooded.
The storms we have can reach high wind speeds, but aren't as destructive as tornado's.
The worst one I can remember was in 2016. We had heavy rainfall and high wind speeds where I live, but five minutes away there was a really bad hailstorm, with hailstones the size of tennis balls.
But storms that bad are relatively rare here, we get weather alarms once or twice a year.