RAIN clouds are often followed by colourful rainbows - but clouds don’t always look this unusual, and rarely do you see a double rainbow.
These photographs of unusual weather phenomena in the skies over Woodseats in Sheffield were taken by Star readers John Glossop and Robert Smith.
The cloud formation is known as mammatus - a meteorological term for a cloud with smooth, round pouches hanging from its base - and are often associated with stormy weather.
The phenomenon occurs when clouds form in sinking air, and often develop on the underside of thunderclouds.
In some cases rainbows can be reflected by a second band of colours, although normally they are too faint to be seen clearly.