Indeed, communication to the cabin and passengers plays a more and more important role in civil tranport.
However, from personal experience, one bunch of pax is not the other and the way turbulence is handeled by cabin crew is not always the same.
In my company, any sort of "rougher than normal" turbulence will be treated by cabin crew as serious. CA1 will first stop service and stow his/her trolleys and then call Cockpit to see if normal ops may be continued. It is also a part of the briefing I give the cabin crew in the crew room before flight (sometimes a good reminder to check Wx info during summertime, by the way).
At the same time, FSB will come on from my part and if turbulence lasts more than just a few minutes or agravates I make a PA.
On the other hand I ususally avoid talking about foressen turbulence as Wx forecast remains a Wx forecast. I trust PIREPS when airborne and then make a PA.
Any body with other practices, speaches, etc...?
