Outside my window this morning

I was rather taken by these clouds which reminded me a bit of waves at the beach. Like beach waves they quickly disappeared.
I knew l had seen this type of cloud once before and have looked it up. This is called a Kelvin-Helmholz formation and is caused by different layers of air moving at different speeds - much like a wave. When the top of the wave gets heavier than the water below it moves faster and then collapses and thats what this cloud formation did.