A rare cloud formation resembling waves in the sky has been seen across North Yorkshire. The billowy phenomenon was captured ...

Cloud-watchers can talk all about the interesting shapes they've noticed over the years. They may have been gazing out the car window during a road trip, or tanning on the beach, or on a morning walk.

The Met Office said: "Kelvin Helmholtz clouds, or fluctus clouds, are quite rare. "These clouds are more likely to be seen on windy days when there is a difference in density of the air.