Spectacular rainbows were seen in parts of the Puget Sound region on Thursday evening, with some folks getting treats of a “double rainbow” or even a very rare “triple” or “quadruple” rainbow!
Rainbows form when the sun is relatively low in the sky (below halfway to the horizon) and rain is present nearby. However, to see the rainbow, the sun needs to be generally at the viewer’s back — behind them — while rain is ahead.
When viewed from just the right angle, the countless raindrops act as prisms, “bending” the sunlight as an actual glass prism does, creating the visible ranges of light from red all the way to violet…