You have to be very quick to capture these brilliant coloured rainbows because the clouds move quickly and the Sun comes out and it all vanishes just like that!
Supernumeraries are formed because two rays of light may follow slightly different paths within a raindrop but still emerge in the same direction.
This gives rise to interference between the two rays and produces the alternating bright and dark bands in the supernumerary bows. The intensity of the colours gives an indication of the size of the raindrops.
To read more about rainbows and explore the science behind Atmospheric Optics please go to Les Cowley’s excellent website at: https://www.atoptics.co.uk
This image was taken with a Canon 70D camera and a Sigma 10-20mm lens @12mm, ISO 200 and exposure time was 1/250th second.