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I often hear the phrase "(something) coming up in the next half hour" when I hear a radio. "(something)" means a specific piece of news there.
As far as I understand that phrase is used to introduce what we will hear in the next half an hour. But, according to this definition it's a bit strange, I mean how can we ever relate "unexpectedly appeared" to that context?
Have a look at definition 1.1 on that same page:
come up: (Of a specified time or event) approach or draw near: she’s got exams coming up
In this definition, the time is known and the event is expected. This definition applies to the context of a radio announcer saying (some news item) is coming up in the next half hour.
Look at Definition 1.1 and the three example sentences. Doesn't the third example seem to be a parallel to the "something's coming up in the next thirty minutes" radio example. This definition talks about the approach of a specified (Cf. specific) event.
By the way, don't get confused by the use of the word something in the first definition. Something refers to a specific item or topic ("piece of news") in both the first definition and the "sub-definition" 1.1.
If the radio announcer actually uses the word something, he or she is still referring to a specific piece of news. It is just that the announcer has not referred to it by name... maybe to keep the listeners in suspense so that they will continue to listen to the show.
