In the picture, white tornado cloud descends from a dark storm cloud. The Sun, peaking through a clear patch of sky to the left, illuminates some buildings in the foreground. Sunlight reflects off raindrops to form a rainbow. By coincidence, the tornado appears to end right over the rainbow. Streaks in the image are hail being swept about by the high swirling winds.
Over 1,000 tornadoes, occur on Earth every year, many in a region called `tornado alley`.