How to conclude a public announcement?

Good night, Mrs. Calabash, wherever you are.

Thank you.

or

Thank you for listening.

I don't think that would work very well for announcing that a tornado is approaching.

It would depend on what is being announced. Thank you for listening, as Noddy suggested, would be good for most any announcement. Can't think of any announcement for which it wouldn't work.

I would conclude with a scream of "OH NOOOOO!!!" then everything goes blank. Thatll make sure they remember the damn message.

I mean a written public announcement
For example, a municipal government is announcing something in written form for the citizens to pay attention to....Then the announcement concludes with a formulaic statement like "It is for the above purpose that this public announcement is made."
So what do you say in your country or in your city?

If anything is said it is usually, "Thank you for listening." Western Culture assumes that citizens are of equal status with municipal authority.

"And in conclusion--deez nutz."

dys, Sometimes I almost like you. Fortunately, I have lots of self control. Ink a dink a dink . . .