Rainbow Lightning:

Nature's Astonishing Bow And Arrow

Most people have experienced lightning. Likewise, ask people if they have ever seen a rainbow and most will answer in the positive. Yet something which few have seen is the moment that a rainbow and lightning occur at the same time.
Lightning frequently happens during heavy storms. The optical and meteorological phenomenon known as a rainbow, however, is generally formed after the rain has stopped. So, how did these pictures come about? Why can lightning and rainbows happen at the same time?