Afternoon Sky at 3-19 pm

It was as if a blind had dropped across the sky. Everything was dark except for a narrow strip of light on the horizon. After a short time, the blackness broke up into dark clouds and looked stormy but we had no rain or wind.It is now twilight time and the sky is  a bluey grey all over. The extra is a closer look a little while later than the main shot. I couldn't find out what caused the blackness. I added a frame to make the edges clearer.