Funny clouds over the Karkonosze Mountains

I'm descending Snezka, hiking east along the Polish-Czech border. The weather forecast predicted a change in the weather, with the distinct possibility of rain and thunderstorms later in the day. To beat that, I've made a fast ascent, but now I can take it easy. Still, I can't help but wonder if those clouds signify an impending deterioration... As it happened, I was back down in less than two hours and didn't even hurry. It was still sunny by that time. But one hour later it started to rain, and in the evening the predicted thunderstorms arrived. 4 September 2016.