Agree 100% with Blondechick. The aircraft can take a hell of a lot more than than what the average thunderstorm can chuck at them. And you can rest assured that the pilots would not have taken off if the storm conditions were not safe to do so. If the storm was 'that bad' the actual airfield would have been closed until the storm had passes.
And most cabin crew love turbulence, it does help to brighten up a run-of-the-mill day when it's pitching and rolling all over the place. I often wonder if cabin crew would be able to stand up right in an earthquake, seeing as to what we have to put up with in turbulence!