I don't think flights will make any routing changes based on these forecasts, as they are much less accurate than weather forecasts. And outside of actual severe turbulence reports - in real-time from actual pilots - or severe weather actually occurring, flights will likely just follow the planned route.

I use the US equivalent - http://www.aviationweather.gov/turbulence/gtg - to get a general feel for what might happen, but rely much more on PIREPS - http://www.aviationweather.gov/airep/gis - to see what's actually being reported. To they have the equivalent for Europe?