Nacreous clouds

Seen over Scarborough today.* 
A nice if rather breezy family day out to the coast for fish and chips.

*Nacreous clouds, also known as polar stratospheric or 'mother of pearl' clouds, are iridescent clouds formed high up in the atmosphere. The rainbow colours are produced as the sunlight diffracts around the tiny ice crystals inside them. They are a common sight during Scandinavian and Canadian winters, but sightings are much rarer in warmer NorthYorkshire!