Let me just clear a few things up here.
I am grateful to those who have answered my question, including Guppy for the later long post. To you too con-pilot for your reply, and to you LSM.
What I object to is the childish overreaction to a reasonable question. As I said, my question arose because I took a flight where the captain briefed passengers to expect a rough approach. So I do not think it is particularly far-fetched or unreasonable when one is interested in aviation to ask oneself: "I wonder if they would ever go as far as saying 'we may need to go-around in this weather'. I note that the answer is 'no'. For that, thank you.
Incidentally, I have noticed that American posters have taken particular issue with the word 'warn'. I wonder therefore whether there is a US/UK English issue here. I certainly did not mean it in the sense 'DANGER AHEAD'.
I think this discussion has run its course. Thank you again for all the sensible answers.