[Fairfre]

I've never been one for looking for signs, but I saw the strangest thing two days ago.
My son and I were sitting in the open air area of MacDonalds.I happened to look up and saw rainbow colours in the sky.
I looked again ,then both my son and I .There was a long cloud stretching about half the sky. The sun was behind part of it,which would explian the rainbow I guess ,but the whole cloud was giving off rainbow colours. I've never seen anything like it before .We took some pics on my mobile and other folks did too when they saw what we were looking at.
The whole cloud ended up giving a wonderful light display.
What do you think of this?
What does a rainbow mean as a sign?