This sound is normal on these evenings for aereas where aren't airbases.
The F-16s go at Monday evening very low over Groningen, Drenthe and now, with Twenthe AFB closed, also over Twenthe.
So, just the noise, not the fun!
We could hear the F-16s these evening also very loud over Emmen
There are many complaints in the mentioned aereas, due to the noise!