It is always a joy to see a rainbow, especially when it's complete. A reminder from God that he will never completely flood the world again - his promise following the account of Noah and the ark.
If you look very carefully, you can see a second, outer, rainbow forming. On this occasion nothing much happened with the second rainbow, or at least from where I was at the time. There hadn't been any rain locally but I guess there would have been a good shower nearby.