Multiple rainbows seen at once is a rarity.

Detailed Description
Multiple Rainbows
The common rainbow is caused by sunlight internally reflected by the backs of falling raindrops, while also being refracted at the air/water boundary. There are actually three rainbows in the sky, with three more being seen in the lake reflection.
- Water and light (water properties)
- Water Science photo gallery
Sources/Usage
Credit: Terje Nordvik