Spectacle of light near Varbovchets

It was a sunny, but windy day. Too hot for the beginning of May, but at least the rain predictions happened to be wrong. However, near sunset I've had some minutes to take a small walk. This was the sky I saw for about 5-6 minutes. I took as many shots and angles as possible, but this one happened to be my favorite.
It is built from 16 vertical shots and processed with Lightroom and Photoshop with use of Nik's Color Efex Pro.