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It was a coincidence or maybe a gift from God. At the funeral of the journalist, a version of 'Over the Rainbow" was played and shortly after that, a rainbow showed up (What's a good verb here?) outside.

Is it understandable and correct?
Thanks
Comments  
a rainbow appeared
a rainbow became visible
a rainbow formed
37 on "a rainbow showed"
0 on "a rainbow showed UP"
455 on "a rainbow formed"
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Marius Hancu 37 on "a rainbow showed"

0 on "a rainbow showed UP"

455 on "a rainbow formed"

And more than 17,000 on "a rainbow appeared"
Thank you, Optilang, MH and Philip.
New2grammara rainbow showed up (What's a good verb here?) outside.
I'd have said appeared without outside. I generally use show up only for people who arrive at an appointed place.
-- Where's Jim?
-- Late as usual. He hasn't showed up yet.
____
-- Who are you inviting to the party?
-- I'm just giving a general invitation to everyone in the office. We'll see who shows up.
____
-- Kate's not here yet.
-- I know. She had another appointment, so she said to leave without her if she didn't show up by 2 o'clock.
____
CJ
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As a matter of fact, my stats were for Google Books
http://books.google.com/books?q=+%22a+rainbow+appeared%22&btnG=Search+Books
not plain Google, and they give:
621 on "a rainbow appeared"